bluuebunny/crossref_metadata_2025 huggingface dataset:
SISTEM KENDALI REMOTE KONTROL DENGAN ATMEGA 328 MENGGUNAKAN SMARTPHONE
Authors: Lantemona Adriel Baruch , Patombongi Andi
Published: February 2021

Seiring dengan perkembangan teknologi yang sangat pesat khususnya dalam bidang perkembangan robot yang menjadikan kualitas kehidupan manusia semakin tinggi. Mobil robot adalah robot yang dapat berpindah tempat yang dikendalikan secara manual yang menggunakan sensor akselerometer pada smartphone dalam pegontrololan mobil robot. Dari penelitian ini bertujuan agar pengguna dapat dengan bebas mengendalikan mobil robot sesuai dengan keinginan. Pembuatan mobil robot terdiri dari pembuatan perangkat keras dan pembuatan prangkat lunak. Pada pembuatan perangkat keras menggunakan beberapa komponen adalah Arduino Uno, Modul Bluetooth, Modul Driver, dan Motor DC dan pembuatan perangkat lunak adalah Arduino IDE dan MIT App Inventor. Pengujian sistem kendali dilakuan dengan mengoneksikan antara dua alat yang berbeda menggunakan media bluetooth. Dalam pengendalian mobil robot ini, aplikasi dibangun untuk mengirim perintah pada mobil robot dengan memiringkan smartphone untuk bergerak maju, mundur, belok kiri, belok kanan dan berhenti. Dengan demikian, aplikasi remot kontrol dapat mengendalikan mobil robot dengan memanfaatkan sensor akselerometer pada smartphone
SISTEM PENDUKUNG KEPUTUSAN SELEKSI PENERIMA BANTUAN PEMBERDAYAAN UNTUK KELOMPOK PETERNAK SAPI MENGGUNAKAN METODE ARAS (ADDITIVE RATIO ASSESSMENT)
Authors: Betrisandi Betrisandi
Published: February 2021

Saat ini program pemerintah bantuan ternak sapi belum optimal dilaksanakan. Hal ini dikarenakan penyaluran bantuan ternak sapi belum mengacu pada kriteria yang ada. Dimana proses penyebaran ternak hanya mempertimbangkan wilayah, pakan dan kriteria lainnya. Diharapkan aplikasi ini dapat bermanfaat bagi pihak yang terkait. Diharapkan Sistem Pendukung Keputusan yang dibuat dapat membantu pihak pengambil keputusan dalam menentukan penerima bantuan ternak sapi . Dalam proses perancangan aplikasi sistem pendukung keputusan penerima bantuan ternak sapi peneliti menggunakan metode ARAS. Metode ARAS (Additive Ratio Assessment)  merupakan salah satu metode pengambilan keputusan multikriteria berdasarkan pada konsep perangkingan menggunakan utility degree yaitu dengan membandingkan nilai indeks keseluruhan setiap alternative terhadap nilai indeks keseluruhan alternative optimal. Sistem pendukung keputusan ini dapat memberikan keputusan alternatif terpilih yang nantinya dapat dijadikan sebagai acuan untuk menentukan Kelompok ternak yang dapat diberikan bantuan. Sistem ini dirancang menggunakan bahasa pemrograman PHP dan MySQL sebagai database.
SISTEM PENDUKUNG KEPUTUSAN PENERIMA BANTUAN TOKEN LISTRIK BAGI MASYARAKAT PENGGUNA DAYA 450 VA METODE FUZZY TOPSIS PADA DESA MANAWA
Authors: Muzakkir Irvan
Published: February 2021

Salah satu bantuan yang ada di desa terkhusus didesa manawa adalah bantuan subsidi token listrik dimana bantuan ini sangat membantu masyarakat yang kurang mampu agar rumah mereka tetap dialiri aliran listrik yang terkadang mereka sendiri tidak mampu untuk membeli langsung token listrik. Tetapi terkadang terjadi banyak permasalahan pada saat penyaluran bantuan tersebut dimana masih kurang tepatnya penyaluran bantuan tersebut, masih banyak masayarakt mampu yang seharunya tidak perlu mendapatkan bantuan tersebut tetapi mereka masih mendapatkan bantuan. Oleh karena itu, perlu dirancang sebuah sistem yang memudahkan dalam proses pengambilan keputusan. Dalam perancangan sebuah sistem pendukung keputusan dibutuhkan sebuah metode untuk melakukan perhitungan nilai-nilai kriteria yang digunakan untuk menyeleksi penerima bantuan. Dalam penelitian ini akan digunakan Fuzzy TOPSIS untuk perangkingan. Digunakannya logika Fuzzy untuk merepresentasikan ketidakpastian, ketidakjelasan, ketidaktepatan, kekurangan informasi, dan kebenaran parsial, serta menggunakan Bahasa Pemrograman PHP untuk pembuatan web, Database MySQL, serta penggunaan Aplikasi Deamweaver dan Photoshop.
PERANCANGAN APLIKASI SISTEM SEPUTAR BERITA KECELAKAAN (STUDI KASUS JAKARTA SELATAN) MENGGUNAKAN TOTAL ARCHITECTURE SYNTESIS
Authors: Anggraeni Sita , Aryadi Fadilla , Immanuel Theodore
Published: February 2021

Kasus kecelakaan di Jakarta naik 7 % pada kuartal pertama tahun 2018, bahkan total korban kecelakaan bertambah signifikan dari tahun sebelumnya. Data tersebut akan bertambah seiring bergulirnya waktu, sehingga dalam pencarian dan pembuatan laporan dibutuhkan Aplikasi Sistem Informasi mengenai berita kecelakaan yang diberikan oleh masyarakat sebagai upaya dalam membantu pihak kepolisian secara realtime dan upaya konfirmasi dari keluarga korban, hal ini sangat membantu kepolisian unit Lalu Lintas daerah Jakarta Selatan,  perancangan Aplikasi Sistem Seputar Berita kecelakaan menggunakan metodologi TAS (Total Architecture Synthesis) dengan menggunakan metodologi TAS diharapkan aplikasi ini dapat memberikan Sistem informasi yang valid  bagi keluarga korban mengenai kecelakaan yang menimpa korban khususnya wilayah Jakarta Selatan.
APLIKASI SISTEM PAKAR MENDETEKSI KERUSAKAN PRINTER CANON INKJET BERBASIS WEB DENGAN METODE FORWARD CHAINING
Authors: Baharuddin Baharuddin , Maruji Maruji
Published: February 2021

canon inkjet series MP ini adalah aplikasi yang memudahkan masyarakat menganalisa kerusakan printernya sendiri tanpa harus terlebih dahulu ke tempat service. Metode dalam pembuatan sistem yang digunakan dalam perancangan sistem ini adalah  forward chaining yaitu dengan memilih gejala kerusakan untuk menampilkan kerusakan printer. Sistem pencarian dalam forward cahining yaitu dengan pencarian  dari awal ke akhir. Hasil dari program ini adalah sebuah informasih kerusakan berdasarkan gejala-gejala kerusakan yang dipilih beserta cara penanganannya.
APLIKASI PENJUALAN DAN PEMBELIAN PADA APOTEK ROSA DELIMA KENDARI BERBASIS PEMROGRAMAN DELPHI 7
Authors: Narang Remilton Gerardus , Thomas Alfin
Published: February 2021

The purpose of this study, to design a sales information system and drug purchasing at Rosa Delima Pharmacy which is useful in managing the sales, purchasing and reporting system quickly and accurately, which is now still doing the sales, purchasing and reporting system manually, in other words still doing data processing by recording regular notes. The impact that can be felt from this designed system is the ease in managing the business of selling goods, especially for the owner of Rosa Delima Pharmacy itself, the method used in designing this system is the DFD design method, the database design method uses ER and the programming language used is the programming language Delphi. The results of this study are an Application of Sales and Purchases at Rosa Delima Pharmacy Kendari
SISTEM PENGOLAHAN DATA SIMPAN PINJAMA PADA KOPERASI RAHMAT JAYA SMPN 6 KENDARI
Authors: Iqsan Achmad , Bani Muhammad Erman
Published: February 2021

Sistem pengolahan data pada koperasi Rahmat Jaya SMPN 6 Kendari dirasakan masih belum efektif dan efisien disebabkan masih menggunakan pengolahan data secara manual seperti data simpanan, angsuran dan pinjaman serta pembuatan laporan yang membutuhkan waktu yang lama. Oleh karena itu, diperlukan suatu sistem pengolahan data simpan pinjam yang terkomputerisasi yang mampu menangani permasalahan tersebut. Tujuan Penelitian ini membuat sebuah sistem pengolahan data simpan pinjam pada koperasi Rahmat Jaya SMPN 6 Kendari, sehingga dapat mempercepat dan mempermudah proses pengolahan data yang terjadi dikoperasi tersebut. Dalam pengembangan sistem penulis menggunakan metode Data Flow Diagram (DFD), Flowchart dan Entity Relationalship Diagram (ERD) dimana teknik pengumpulan data yang digunakan antara lain wawancara dan dokumentasi.  Hasil yang terdapat dalam sistem ini antara lain pengolahan data anggota, data simpanan, data pinjaman, data angsuran dan data SHU pada koperasi Rahmat Jaya SMPN 6 Kendari sangat berguna dalam mempercepat dan mempermudah pencatatan transaksi simpan pinjam dan data menjadi aman karena telah tersimpan dalam sebuah database
SISTEM INFORMASI PENGADUAN HUKUM SECARA ONLINE TINDAK PIDANA (STUDI KASUS PADA POLRES KENDARI)
Authors: Rejekiana Sri , Sukma Ilin
Published: February 2021

Kepolisian di negara modern yang demokratis mempunyai fungsi pelayanan keamanan kepada individu, komunitas (masyarakat setempat) dan negara. Melaporkan tindak pidana kepada Kepolisian diatur berdasarkan Pasal 4 ayat (1) Nomor 23 Tahun 2007 tentang Daerah Hukum Kepolisian Negara Republik Indonesia. Tingginya tingkat kejahatan di kota Kendari dan kurang efektifnya sistem pengaduan yang masih menggunakan cara manual dengan mendatangi langsung kantor kepolisian menjadi salah satu kendala yang menghambat penanganan tindak kejahatan.  Untuk itu dibutuhkan sebuah sistem berbasis komputer yang memudahkan masyarakat untuk melakukan pengaduan tindak kekerasan dengan mudah dan cepat menggunakan intenet kapan pun dan di mana pun tempatnya. Penelitian ini bertujuan untuk membangun sebuah sistem informasi pengaduan hukum untuk tindak pidana pada Polres Kendari secara online. Hasil penelitian ini diharapkan membantu masyarakat dalam melaporkan tindak pidana sehingga dapat lebih cepat diproses dan ditindaklanjuti oleh pihak kepolisian.
ANALISIS DAMPAK PENERAPAN AKUNTANSI BERBASIS AKRUAL TERHADAP PELAPORAN KEUANGAN BADAN PENGELOLA KEUANGAN DAN ASET DAERAH KABUPATEN MUSI BANYUASIN
Authors: Septariani Jumania
Published: February 2021

Penelitian ini membahas tentang dampak penerapan akuntansi berbasis akrual terhadap pelaporan keuangan Badan Pengelola Keuangan dan Aset Daerah Kabupaten Musi Banyuasin. Penelitian ini dilakukan pada Badan Pengelola Keuangan dan Aset Daerah (BPKAD) Kabupaten Musi Banyuasin. Penelitian ini termasuk jenis penelitian kualitatif. Data yang digunakan adalah dokumentasi dan wawancara. Analisis data yang digunakan adalah analisis deskriptif kualitatif. Hasil penelitian menunjukkan bahwa penerapan akuntansi berbasis akrual memiliki dampak dalam penyajian laporan keuangan BPKAD. Salah satunya perubahan komponen laporan keuangan yang sebelumnya tidak dijelaskan secara rinci menjadi lebih rinci sehingga lebih mudah dipahami dan diterima oleh pengguna, lebih akuntabel serta lebih relevan, meskipun masih ada kendala dalam mengkonversikan komponen tersebut sehingga terjadi keterlambatan waktu penyampaian laporan keuangan. BPKAD sebaiknya mengadakan pelatihan tentang pengelolaan SIMDA Keuangan bagi pegawai dan operator SIMDA setiap OPD serta menyeleksi pegawai yang memiliki latar belakang pendidikan yang sesuai dengan bidangnya agar lebih mempermudah penyajian laporan keuangan sesuai dengan Peraturan Pemerintah Nomor 71 Tahun 2010 dan Peraturan Menteri Dalam Negeri Nomor 63 Tahun 201
PENGUJIAN EMPIRIS BAGAIMANA KUALITAS SISTEM INFORMASI AKUNTANSI YANG DIPENGARUHI OLEH ETIKA ORGANISASI BERIMPLIKASI TERHADAP KUALITAS INFORMASI AKUNTANSI
Authors: Hertati Lesi , Susanto Azhar , Zarkasyi Wahyudin , Suharman Harry , Umar Haryono
Published: February 2021

Accounting Information System is one of the most important parts in an organization. Function Organizational ethics is very influential on accounting information systems will produce accounting information needed by managers and non-managers of an organization as a basis for the decision making process in carrying out its functions or duties. The functions and tasks of managers or non-managers of related units within an organization vary greatly depending on the type of organization, the sections and levels that exist within the organization. The functions and tasks of managers or non-managers differ because the different levels and sections that cause the information needs of managers and non-managers are to support different functions and tasks. The difference in information requirements will lead to different data that must be entered and the accounting information system format used. Reality states that many accounting information systems in various state-owned enterprises have a variety of problems including problems of integration, ease of use, ease of access, ease of adaptation to changing conditions and the ability to produce accounting information as needed. The purpose of this study was to determine how much influence the organization's ethics has on the quality of accounting information systems and their implications for the quality of management accounting information. This method is descriptive and verification method, and the analysis tool is SEM Lisrel modeling. The results showed that user ethics significantly influence the quality of accounting information systems and their implications for the quality of accounting information.
Analisis Sistem Pengendalian Intern Penjualan Kredit Untuk Memaksimalkan Target Pencairan Piutang Pada PT. Bintang Mulia Jaya
Authors: Permana Kemas Welly Angga
Published: February 2021

Penelitian ini adalah untuk mengetahui kinerja sistem pengendalian intern penjualan kredit untuk memaksimalkan target pencairan piutang pada PT.Bintang Mulia Jaya apakah sudah sesuai standar atau belum, data sekunder diperlukan sebagai dasar analisis, sedangkan teknik pengumpulan datanya adalah wawancara dan dokumentasi. Metode analisis yang digunakan adalah metode kualitatif komparatif.

Penelitian ini termasuk jenis penelitian deskritif, dimana analisis yang telah dilakukan menyatakan bahwa PT. Bintang Mulia Jaya belum menerapkan sistem pengendalian intern penjualan kredit secara memadai sesuai dengan teori yang ada pada sistem pengendalian intern, ada beberapa fungsi yang terkait dalam penjualan kredit yang tidak kompeten dan tindakan yang diberikan pimpinan kepada fungsi - fungsi yang terkait pada permasalahan yang timbul diperusahaan berupa teguran kepada masing masing fungsi.

Hasil penelitian agar dapat mencapai tujuan yang diharapkan maka penulis menyarankan sebaiknya melakukan perbaikan penerapan sistem pengendalian intern yang ada pada PT. Bintang Mulia Jaya sesuai dengan teori yang ada pada unsur-unsur sistem pengendalian intern.Lebih memperhatikan setiap transaksi yang berhubungan dengan penjualan kredit.
PENGARUH KUALITAS PELAYANAN TERHADAP KEPUASAN PASIEN PADA PUSKESMAS TANAH ABANG KECAMATAN BATANGHARI LEKO
Authors: Tores Ropal
Published: February 2021

This study aims to determine how the influence of service quality on patient satisfaction at Puskesmas Tanah Abang Batanghari Leko District. Field research, where researchers visited Tanah Abang District Health Center Batang Hari Leko by holding question and answer directly to employees who have the authority to provide data and information needed. The result of the research shows that there is influence of service quality to patient satisfaction at Tanah Abang Public Health Center of Batanghari Leko District. The method of analysis used in the research is simple linear regression. This study provides the latest evidence on the effect of service quality on patient satisfaction at Tanah Abang Public Health Center, Batanghari Leko District.
PENGARUH PROGRAM KESELAMATAN KERJA TERHADAP PRODUKTIVITAS KERJA KARYAWAN PT. MUSI BANYUASIN INDAH
Authors: Oemar Usailan , Alamsyah Rully , Riansyah Rio
Published: February 2021

This study aims to determine the effect of work safety programs on employee productivity at PT. Musi Banyuasin Indah. The method in this research is simple linear regression model. The population in this study all employees of PT Musi Banyuasin Indah which amounted to 578 people. The sample in this study amounted to 86 respondents taken using random sampling. The data studied is employee questionnaire data of PT Musi Banyuasin Indah. The results of this study can be seen that there is a significant influence between the safety program on employee work productivity PT. Musi Banyuasin Indah. The result of kofisien termination obtained by value of R square (R2) equal to 0,312 or 31,2%. This means the work safety program affecting work productivity by 31.2%, the remaining 68.8% influenced by other variables/factors not included/investigated in this study.
Indah Mawarni& Syilvia Desi Septiana, PENGARUH KOMUNIKASI ORGANISASI DAN MOTIVASI KERJA TERHADAP KINERJAKARYAWAN PADA PT.BANK BUKOPIN, Tbk. CABANG PALEMBANG
Authors: Mawarni Indah , Septiana Syilvia Dewi
Published: February 2021

This study aims to determinethe effect of organizational communication on the performance of employees, the effect of work motivation on the performance of employees and the influence of organizational communication, and work motivation on the performance of employees of PT. Bank Bukopin, Tbk. Palembang Branch both partially and simultaneously.The sample used in this study was a permanent employee of PT. Bank Bukopin, Tbk. Palembang Branch, which has a minimum service period of 2 years and has offices in Palembang Main Branch as many as 30 respondents. The technique used in taking this sample is to use one of the non probability sampling techniques, namely purposive sampling. The analytical method used is descriPT.ive analysis method using path analysis with the SPSS for Windows version 23.The test results of the hypothesis indicate that the variables: (1) organizational communication has a positive effect on employee performance. (2) Work Motivation of Organizational Communication and Work Motivation means that work motivation has a positive and significant effect on employee performance. (3) Organizational Communication and Work Motivation have a positive effect on Employee Performance at PT.Bank Bukopin, Tbk. Palembang Branch. Organizational communication and work motivation together have an effect on employee performance.
Ferry Supriyanto, Imelda, Sri Gustini, PENGARUH MOTIVASI KERJA TERHADAP KINERJA PEGAWAI BADAN PENANGGULANGAN BENCANA DAERAH KABUPATEN MUSI BANYUASIN
Authors: Supriyanto Fery , Imelda . , Gustini Sri
Published: February 2021

This research entitled "The effect of  work motivation towards job performance of Badan Penanggulangan Bencana Daerah employees of Musi Banyuasin Regency". Population in this research is 60 persons of Badan Penanggulangan Bencana Daerah employees of Musi Banyuasin regency. The sample of this research is all of BPBD employees Musi Banyuasin regency, so that this reaserch is called as population research, where all of population with the total number of 60 is as sample. Sampling technique that is used is using saturated sampling. The research findings showed that Motivation has impact towardsemployees' job performance of Badan Penanggulangan Bencana Daerah Musi Banyuasin regency. from the validity and reliability testresult by using SPSS is got if r  obtained value≥ r table, motivation value is 0.610  and employees' job performance value is  0.616 so this value is higher than r critical value of product moment that is 0.254 (look at appendices of r table).Constants is 6.218, regression coeffisient of motivation variable (X) is 0.851. Based on t-test value ia got that t-obtained value is higher than t - table value (14.569 > 2.002).
PENGARUH IKLAN SMARTPHONE TERHADAP PERILAKU BRAND SWITCHING KONSUMEN BAYUNG LENCIR MUSI BANYUASIN
Authors: Suryani Ade Nia
Published: February 2021

This study aims to determine the effect of smartphone advertisements on consumer switching brand behavior in Bayung Lencir Subdistrict, Musi Banyuasin Regency. This research is a study of causality. The population of this study is consumers in the District of Bayung Lencir, especially those who use smartphones. The total sample of 100 people was determined using the Malhotra formula. The sample was selected using a purposive sampling technique. Data were collected using the questionnaire method and analyzed using simple linear regression analysis and correlation analysis. The results showed that (1) the correlation coefficient value of 0.844 showed that there was a very strong relationship or correlation between smartphone advertisements and consumer switching brand behavior in Bayung Lencir Subdistrict, Musi Banyuasin Regency, while the Adjusted R Square value of 0.709 indicated that smartphone advertising affected behavior consumer brand switching is 70.9%, (2) the results of the t hypothesis test show that smartphone advertising significantly influences the brand switching behavior of consumers in the Bayung Lencir District of Musi Banyuasin Regency with a tcount> ttable (15,576> 1,984).
Analisis Paparan Fume Pengelasan Pada Pengelas Di Divisi Kendaraan Khusus PT. X
Authors: Hamid Farid Alfalaki , Oginawati Katharina
Published: February 2021

Penelitian mengenai paparan fume pengelasan pada pengelas di Divisi Kendaraan Khusus PT. X telah dilakukan. Penggunaan mesin Gas Metal Arc Welding (GMAW) semakin luas di kawasan industri sehingga dampak kesehatan yang ditimbulkan fume pengelasan harus menjadi perhatian. Tujuan penelitian ini untuk mengetahui nilai paparan yang diterima pengelas. Kelompok non-pengelas merupakan pekerja di bagian administrasi digunakan sebagai pembanding. Teknik pengumpulan data menggunakan personal sampling pump terkalibrasi yang telah dipasang filter Mixed Cellulose Ester (MCE). Metode Gravimetri digunakan untuk menghitung konsentrasi partikulat terespirasi dan Indeks Bahaya (HI) digunakan untuk mengetahui bahaya dari proses pengelasan. Rata-rata konsentrasi partikulat terespirasi pada pengelas sebesar 7.913,94 μg/m3, sedangkan pada non-pengelas 219,91 μg/m3. Indeks Bahaya (HI) kelompok pengelas sebesar 9,45 sedangkan pada kelompok non-pengelas 0,51. Untuk itu, perlu dilakukan tindakan pencegahan untuk mengurangi bahaya fume pengelasan.

 

Kata kunci: Fume pengelasan; GMAW; Indeks bahaya; Metode gravimetri
PENGARUH GEOMETRI PAHAT, TEBAL PEMAKANAN DAN JENIS PAHAT TERHADAP KEAUSAN DAN KUALITAS KEKASARAN PERMUKAAN HASIL PROSES PEMBUBUTAN BENDA KERJA BAJA AISI 1045 MENGGUNAKAN MESIN CNC QTN 100 U
Authors: Waluyo Joko
Published: February 2021

Dalam industri manufaktur penggunaan mesin CNC turning mengalami peningkatan yang cukup besar mengingat produksi yang dihasilkan memiliki tingkat kualitas yang jauh lebih baik dibandingkan mesin bubut konvensional.

 Dalam proses pemesinan mesin bubut CNC parameter pemotongan sangat berpengaruh terhadap kualitas kekasaran permukaan dan keausan pahat yang digunakan pada proses permesinan.

Pelaksanaan untuk proses pembubutannya benda uji, foto makro dan keausan pahat penelitiannya dilaksanakan di laboratorium Cumputer Numirecal Control (CNC) dengan alamat jalan Idewa Nyoman Oka 32 Yogyakarta.

Tujuan penelitian ini adalah untuk mendapatkan kualitas permukaan yang optimum dan kausan pahat yang minimal dengan menggunakan bahan pahat CNMG dan DNMG dengan  parameter sudut pahat 80º dan  55º dengan tebal pemotongan  dan kecepatan pemotongan 300 meter/menit dengan tebal pemakanan 1 mm, 05 mm serta feeding 0,25 mm/putaran.

          Hasil penelitian nilai kekasaran permukaan yang optimum untuk bahan pahat dari bahan CNMG dan DNMG  besarnya adalah 2,33 µm dan 5,01 µm untuk pemotongan dengan tebal 1 mm dan untuk pemotongan dengan tebal 0,5 mm besarnya nilai kekasaran adalah 1,44 µm dan 2,33µm.

          Keausan pahat dengan bahan CNMG geometri sudut pahat 800  besarnya keausan untuk pemotongan dengan tebal 1mm dan 0,5 mm adalah 0,016 mm  dan 0,024 mm  untuk sudut pahat 550 dengan bahan DNMG tebal pemotongan 1 mm dan 0,5 mm  besarnya adalah  0,023 dan 0,035 mm
Influence of sea salt aerosols on the development of Mediterranean
tropical-like cyclones
Authors: Pravia-Sarabia Enrique , Gómez-Navarro Juan José , Jiménez-Guerrero Pedro , Montávez Juan Pedro
Published: February 2021

Abstract. Medicanes are mesoscale tropical-like cyclones that develop in the Mediterranean basin and represent a great hazard for the coastal population. The skill to accurately simulate them is of utmost importance to prevent economical and personal damages. Medicanes are fuelled by the latent heat released in the condensation process associated to convective activity, which is regulated by the presence and activation of cloud condensation nuclei, originated mainly from sea salt aerosols (SSA) for marine environments. Henceforth, the purpose of this contribution is twofold: assessing the effects of an interactive calculation of SSA on the strengthening and persistence of medicanes; and providing insight on the casuistry and sensitivities around their simulation processes. To this end, a set of simulations has been conducted with a chemistry/meteorology coupled model considering prescribed aerosols (PA) and interactive aerosol concentrations (IA). The results indicate that IA produces longer-lasting and more intense medicanes. Further, the role of the initialization time and nudging strategies for medicane simulations has been explored. Overall, the results suggest that (1) the application of spectral nudging dampens the effects of IA; (2) the initialization time introduces a strong variability on the storm dynamics; and (3) wind-SSA feedback is crucial and should be considered when studying medicanes.
Effects of liquid–liquid phase separation and relative humidity on the heterogeneous OH oxidation of inorganic–organic aerosols: insights from methylglutaric acid and ammonium sulfate particles
Authors: Lam Hoi Ki , Xu Rongshuang , Choczynski Jack , Davies James F. , Ham Dongwan , Song Mijung , Zuend Andreas , Li Wentao , Tse Ying-Lung Steve , Chan Man Nin
Published: February 2021

Abstract. Organic compounds residing near the surface of atmospheric aerosol particles
are exposed to chemical reactions initiated by gas-phase oxidants, such as
hydroxyl (OH) radicals. Aqueous droplets composed of inorganic salts and
organic compounds can undergo phase separation into two liquid phases,
depending on aerosol composition and relative humidity (RH). Such phase
behavior can govern the surface characteristics and morphology of the
aerosols, which in turn affect the heterogeneous reactivity of organic
compounds toward gas-phase oxidants. In this work, we used an aerosol flow
tube reactor coupled with an atmospheric pressure ionization source (direct
analysis in real time) and a high-resolution mass spectrometer to
investigate how phase separation in model aqueous droplets containing an
inorganic salt (ammonium sulfate, AS) and an organic acid (3-methylglutaric
acid, 3-MGA) with an organic-to-inorganic dry mass ratio (OIR) of 1 alters
the heterogeneous OH reactivity. At high RH, 3-MGA/AS aerosols were aqueous
droplets with a single liquid phase. When the RH decreased, aqueous 3-MGA/AS
droplets underwent phase separation at ∼75 % RH. Once the
droplets were phase-separated, they exhibited either a core–shell,
partially engulfed or a transition from core–shell to partially engulfed
structure, with an organic-rich outer phase and an inorganic-rich inner
phase. The kinetics, quantified by an effective heterogenous OH rate
constant, was found to increase gradually from 1.01±0.02×10-12 to 1.73±0.02×10-12 cm3 molec.−1 s−1 when the RH decreased from 88 % to 55 %. The heterogeneous reactivity of phase-separated droplets is slightly
higher than that of aqueous droplets with a single liquid phase. This could
be explained by the finding that when the RH decreases, higher
concentrations of organic molecules (i.e., 3-MGA) are present at or near the
droplet surface, which are more readily exposed to OH oxidation, as
demonstrated by phase separation measurements and model simulations. This
could increase the reactive collision probability between 3-MGA molecules
and OH radicals dissolved near the droplet surface and secondary chain
reactions. Even for phase-separated droplets with a fully established
core–shell structure, the diffusion rate of organic molecules across the
organic-rich outer shell is predicted to be fast in this system. Thus, the
overall rate of reactions is likely governed by the surface concentration of
3-MGA rather than a diffusion limitation. Overall, understanding the aerosol
phase state (single liquid phase versus two separate liquid phases) is
essential to better probe the heterogenous reactivity under different
aerosol chemical composition and environmental conditions (e.g., RH).
High-resolution hybrid inversion of IASI ammonia columns to constrain US ammonia emissions using the CMAQ adjoint model
Authors: Chen Yilin , Shen Huizhong , Kaiser Jennifer , Hu Yongtao , Capps Shannon L. , Zhao Shunliu , Hakami Amir , Shih Jhih-Shyang , Pavur Gertrude K. , Turner Matthew D. , Henze Daven K. , Resler Jaroslav , Nenes Athanasios , Napelenok Sergey L. , Bash Jesse O. , Fahey Kathleen M. , Carmichael Gregory R. , Chai Tianfeng , Clarisse Lieven , Coheur Pierre-François , Van Damme Martin , Russell Armistead G.
Published: February 2021

Abstract. Ammonia (NH3) emissions have large impacts on air quality and nitrogen
deposition, influencing human health and the well-being of sensitive
ecosystems. Large uncertainties exist in the “bottom-up” NH3 emission
inventories due to limited source information and a historical lack of
measurements, hindering the assessment of NH3-related environmental
impacts. The increasing capability of satellites to measure NH3
abundance and the development of modeling tools enable us to better
constrain NH3 emission estimates at high spatial resolution. In this
study, we constrain the NH3 emission estimates from the widely used
2011 National Emissions Inventory (2011 NEI) in the US using Infrared
Atmospheric Sounding Interferometer NH3 column density measurements
(IASI-NH3) gridded at a 36 km by 36 km horizontal resolution. With a
hybrid inverse modeling approach, we use the Community Multiscale Air Quality Modeling System (CMAQ) and its multiphase adjoint model to optimize NH3 emission estimates in April, July, and October.
Our optimized emission estimates suggest that the total NH3 emissions
are biased low by 26 % in 2011 NEI in April with overestimation in the Midwest
and underestimation in the Southern States. In July and October, the
estimates from NEI agree well with the optimized emission estimates, despite
a low bias in hotspot regions. Evaluation of the inversion performance using
independent observations shows reduced underestimation in simulated ambient
NH3 concentration in all 3 months and reduced underestimation in
NH4+ wet deposition in April. Implementing the optimized NH3
emission estimates improves the model performance in simulating PM2.5
concentration in the Midwest in April. The model results suggest that the
estimated contribution of ammonium nitrate would be biased high in a priori
NEI-based assessments. The higher emission estimates in this study also
imply a higher ecological impact of nitrogen deposition originating from
NH3 emissions.
Assessment of vertical air motion among reanalyses and qualitative comparison with very-high-frequency radar measurements over two tropical stations
Authors: Uma Kizhathur Narasimhan , Das Siddarth Shankar , Ratnam Madineni Venkat , Suneeth Kuniyil Viswanathan
Published: February 2021

Abstract. Vertical wind (w) is one of the most important meteorological parameters for understanding a range of different atmospheric phenomena. Very few direct measurements of w are available so that most of the time one must depend on reanalysis products. In the present study, assessment of w among selected reanalyses (ERA-Interim, ERAi; ERA fifth generation, ERA5; Modern-Era Retrospective analysis for Research and
Applications, version 2, MERRA-2; National Center for Atmospheric Research and Depart-
ment of Energy reanalysis, NCEP–DOE (R-2); and Japanese 55-year reanalysis, JRA-55) and qualitative comparison of those datasets with VHF radar measurements over the convectively active regions Gadanki, India (13.5∘ N, 79.2∘ E), and Kototabang, Indonesia (0∘ S, 100.2∘ E), are presented for the first time in the troposphere and lower stratosphere. The magnitude of w derived from reanalyses is 10 %–50 % less than that from the radar observations. Radar measurements of w show downdrafts below 8 and 10 km and updrafts above 8–10 km over both locations. Intercomparison between the ensemble of reanalyses with respect to individual reanalysis shows that ERAi, MERRA-2 and JRA-55 compare well with the ensemble compared to ERA5 and NCEP–DOE (R-2). There is no significant improvement in w due to the effect of different spatial sampling for reanalysis data around the Gadanki station. Directional tendency shows that the percentage of updrafts captured is reasonably good, but downdrafts are not well captured by all reanalyses. Thus, caution is advised when using w from reanalyses.
Concentrations, particle-size distributions, and dry deposition fluxes of aerosol trace elements over the Antarctic Peninsula in austral summer
Authors: Fan Songyun , Gao Yuan , Sherrell Robert M. , Yu Shun , Bu Kaixuan
Published: February 2021

Abstract. Size-segregated particulate air samples were collected during the
austral summer of 2016–2017 at Palmer Station on Anvers Island, western Antarctic Peninsula,
to characterize trace elements in aerosols. Trace
elements in aerosol samples – including Al, P, Ca, Ti, V, Mn, Ni, Cu, Zn, Ce,
and Pb – were determined by total digestion and a sector field inductively
coupled plasma mass spectrometer (SF-ICP-MS). The crustal enrichment factors
(EFcrust) and k-means clustering results of particle-size distributions
show that these elements are derived primarily from three sources: (1) regional crustal emissions, including possible resuspension of soils
containing biogenic P, (2) long-range transport, and (3) sea salt. Elements
derived from crustal sources (Al, P, Ti, V, Mn, Ce) with
EFcrust<10 were dominated by the coarse-mode particles
(>1.8 µm) and peaked around 4.4 µm in diameter,
reflecting the regional contributions. Non-crustal elements (Ca, Ni, Cu, Zn,
Pb) showed EFcrust>10. Aerosol Pb was primarily dominated
by fine-mode particles, peaking at 0.14–0.25 µm, and likely was
impacted by air masses from southern South America based on air mass back
trajectories. However, Ni, Cu, and Zn were not detectable in most size
fractions and did not present clear size patterns. Sea-salt elements (Ca,
Na+, K+) showed a single-mode distribution and peaked at 2.5–4.4 µm. The estimated dry deposition fluxes of mineral dust for the
austral summer, based on the particle-size distributions of Al measured at
Palmer Station, ranged from 0.65 to 28 mg m−2 yr−1 with a mean of
5.5±5.0 mg m−2 yr−1. The estimated dry deposition fluxes
of the target trace elements in this study were lower than most fluxes
reported previously for coastal Antarctica and suggest that atmospheric
input of trace elements through dry deposition processes may play a minor
role in determining trace element concentrations in surface seawater over
the continental shelf of the western Antarctic Peninsula.
Global trends and European emissions of tetrafluoromethane (CF4), hexafluoroethane (C2F6) and octafluoropropane (C3F8)
Authors: Say Daniel , Manning Alistair J. , Western Luke M. , Young Dickon , Wisher Adam , Rigby Matthew , Reimann Stefan , Vollmer Martin K. , Maione Michela , Arduini Jgor , Krummel Paul B. , Mühle Jens , Harth Christina M. , Evans Brendan , Weiss Ray F. , Prinn Ronald G. , O'Doherty Simon
Published: February 2021

Abstract. Perfluorocarbons (PFCs) are amongst the most potent greenhouse gases listed under the United Nations Framework Convention on Climate Change (UNFCCC). With atmospheric lifetimes on the order of thousands to tens of thousands of years, PFC emissions represent a permanent alteration to the global atmosphere on human timescales. While the industries responsible for the vast majority of these emissions – aluminium smelting and semi-conductor manufacturing – have made efficiency improvements and introduced abatement measures, the global mean mole fractions of three PFCs, namely tetrafluoromethane (CF4, PFC-14), hexafluoroethane (C2F6, PFC-116) and octafluoropropane (C3F8, PFC-218), continue to grow. In this study, we update baseline growth rates using in situ high-frequency measurements from the Advanced Global Atmospheric Gases Experiment (AGAGE) and, using data from four European stations, estimate PFC emissions for northwest Europe. The global growth rate of CF4 decreased from 1.3 ppt yr−1 in 1979 to 0.6 ppt yr−1 around 2010 followed by a renewed steady increase to 0.9 ppt yr−1 in 2019. For C2F6, the growth rate grew to a maximum of 0.125 ppt yr−1 around 1999, followed by a decline to a minimum of 0.075 ppt yr−1 in 2009, followed by weak growth thereafter. The C3F8 growth rate was around 0.007 ppt yr−1 until the early 1990s and then quickly grew to a maximum of 0.03 ppt yr−1 in 2003–2004. Following a period of decline until 2012 to 0.015 ppt yr−1, the growth rate slowly increased again to ∼ 0.017 ppt yr−1 in 2019. We used an inverse modelling framework to infer PFC emissions for northwest Europe. No statistically significant trend in regional emissions was observed for any of the PFCs assessed. For CF4, European emissions in early years were linked predominantly to the aluminium industry. However, we link large emissions in recent years to a chemical manufacturer in northwest Italy. Emissions of C2F6 are linked to a range of sources, including a semi-conductor manufacturer in Ireland and a cluster of smelters in Germany's Ruhr valley. In contrast, northwest European emissions of C3F8 are dominated by a single source in northwest England, raising the possibility of using emissions from this site for a tracer release experiment.
The Portable Ice Nucleation Experiment (PINE): a new online instrument for laboratory studies and automated long-term field observations of ice-nucleating particles
Authors: Möhler Ottmar , Adams Michael , Lacher Larissa , Vogel Franziska , Nadolny Jens , Ullrich Romy , Boffo Cristian , Pfeuffer Tatjana , Hobl Achim , Weiß Maximilian , Vepuri Hemanth S. K. , Hiranuma Naruki , Murray Benjamin J.
Published: February 2021

Abstract. Atmospheric ice-nucleating particles (INPs) play an important role in determining the phase of clouds, which affects their albedo and lifetime. A lack of data on the spatial and temporal variation of INPs around the globe limits our predictive capacity and understanding of clouds containing ice. Automated instrumentation that can robustly measure INP concentrations across the full range of tropospheric temperatures is needed in order to address this knowledge gap. In this study, we demonstrate the functionality and capacity of the new Portable Ice Nucleation Experiment (PINE) to study ice nucleation processes and to measure INP concentrations under conditions pertinent for mixed-phase clouds, with temperatures from about −10 to about −40 ∘C. PINE is a cloud expansion chamber which avoids frost formation on the cold walls and thereby omits frost fragmentation and related background ice signals during the operation. The development, working principle and treatment of data for the PINE instrument is discussed in detail. We present laboratory-based tests where PINE measurements were compared with those from the established AIDA (Aerosol Interaction and Dynamics in the Atmosphere) cloud chamber. Within experimental uncertainties, PINE agreed with AIDA for homogeneous freezing of pure water droplets and the immersion freezing activity of mineral aerosols. Results from a first field campaign conducted at the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) observatory in Oklahoma, USA, from 1 October to 14 November 2019 with the latest PINE design (a commercially available PINE chamber) are also shown, demonstrating PINE's ability to make automated field measurements of INP concentrations at a time resolution of about 8 min with continuous temperature scans for INP measurements between −10 and −30 ∘C. During this field campaign, PINE was continuously operated for 45 d in a fully automated and semi-autonomous way, demonstrating the capability of this new instrument to also be used for longer-term field measurements and INP monitoring activities in observatories.
Subsurface flow and phosphorus dynamics in beech forest hillslopes during sprinkling experiments: how fast is phosphorus replenished?
Authors: Rinderer Michael , Krüger Jaane , Lang Friederike , Puhlmann Heike , Weiler Markus
Published: February 2021

Abstract. The phosphorus (P) concentration of soil solution is of
key importance for plant nutrition. During large rainfall events, the P
concentration is altered by lateral and vertical subsurface storm flow (SSF)
that facilitates P mobilization, redistribution within the soil profile and
potential P export from the ecosystem. These processes are not well studied
under field conditions. Important factors of the replenishment of P
concentrations in soil solutions are the rate of P replenishment (by biotic
and abiotic processes) and the P buffering capacity of soils. Lab
experiments have shown that replenishment times can vary between minutes and
months. The question remains of how P concentrations in lateral and vertical
SSF vary under natural field conditions. We present results of large-scale
sprinkling experiments simulating 150 mm throughfall at 200 m2 plots on
hillslopes at three beech forests in Germany. We aimed at quantifying
lateral and vertical SSF and associated P concentrations on the forest
floor, in the mineral soil and in the saprolite during sprinkling experiments in
spring and summer. The sites differed mainly in terms of soil depth,
skeleton content and soil P stock (between 189 and 624 g/m2 in the top 1 m soil depth). Vertical SSF in the mineral soil
and in the saprolite was at least 2 orders of magnitude larger than
lateral SSF at the same depth. Vertical and lateral SSF consisted mainly of
pre-event water that was replaced by sprinkling water. Higher P
concentrations in SSF in the first 1 to 2 h after the onset of SSF indicated
nutrient flushing, but P concentrations in the mineral soil and saprolite
were nearly constant thereafter for most of the experiment despite a strong
increase in SSF. This suggests that P in the soil solution at all three
sites was replenished fast by mineral or organic sources. If chemostatic
transport conditions would dominate in SSF, annual P losses at the lateral
and vertical boundary of a forest plot could be approximated by knowing the
average P concentration and the water fluxes in forest soils. A rough
estimation of the annual P loss based on this simplified assumption for one
of our sites with longer SSF data resulted in an annual P loss of
3.16 mg/m2/a. This P loss is similar to estimates from a previous study
at the same site using bi-weekly groundwater samples. Our approximated
annual P loss in SSF was in a similar order of magnitude as P input by dry
and wet deposition and by mineral weathering. Despite the fact that P losses
from the ecosystem seem to be small, the translocation of P from the forest
floor to the mineral soil might be of high relevance at sites with low P
stocks where the forest floor is the dominant source for the P nutrition of
trees.
The climate benefit of carbon sequestration
Authors: Sierra Carlos A. , Crow Susan E. , Heimann Martin , Metzler Holger , Schulze Ernst-Detlef
Published: February 2021

Abstract. Ecosystems play a fundamental role in climate change mitigation by photosynthetically fixing carbon from the atmosphere and storing it for a period of time in organic matter. Although climate impacts of carbon emissions by sources can be quantified by global warming potentials, the appropriate formal metrics to assess climate benefits of carbon removals by sinks are unclear.
We introduce here the climate benefit of sequestration (CBS), a metric that quantifies the radiative effect of fixing carbon dioxide from the atmosphere and retaining it for a period of time in an ecosystem before releasing it back as the result of respiratory processes and disturbances.
In order to quantify CBS, we present a formal definition of carbon sequestration (CS) as the integral of an amount of carbon removed from the atmosphere stored over the time horizon it remains within an ecosystem. Both metrics incorporate the separate effects of (i) inputs (amount of atmospheric carbon removal) and (ii) transit time (time of carbon retention) on carbon sinks, which can vary largely for different ecosystems or forms of management.
These metrics can be useful for comparing the climate impacts of carbon removals by different sinks over specific time horizons, to assess the climate impacts of ecosystem management, and to obtain direct quantifications of climate impacts as the net effect of carbon emissions by sources versus removals by sinks.
Implications of geoarchaeological investigations for the contextualization of sacred landscapes in the Nile Delta
Authors: Lange-Athinodorou Eva
Published: February 2021

Abstract. Key elements of sacred landscapes of the Nile Delta were lakes, canals and artificial basins connected to temples, which were built on elevated terrain. In the case of temples of goddesses of an ambivalent, even dangerous, nature, i.e. lioness goddesses and all female deities who could appear as such, the purpose of sacred lakes and canals exceeded their function as a water resource for basic practical and religious needs. Their pleasing coolness was believed to calm the goddess' fiery nature, and during important religious festivals, the barques of the goddesses were rowed on those waters. As archaeological evidence was very rare in the past, the study of those sacred waters was mainly confined to textual sources. Recently applied geoarchaeological methods, however, have changed this situation dramatically: they allow in-depth investigations and reconstructions of these deltaic sacred landscapes. Exploring these newly available data, the paper presented here focuses on the sites of Buto, Sais and Bubastis, by investigating the characteristics of their sacred lakes, canals and marshes with respect to their hydrogeographical and geomorphological context and to their role in ancient Egyptian religion and mythology as well.
Crowdsourced air traffic data from the OpenSky Network 2019–2020
Authors: Strohmeier Martin , Olive Xavier , Lübbe Jannis , Schäfer Matthias , Lenders Vincent
Published: February 2021

Abstract. The OpenSky Network is a non-profit association that crowdsources the global collection of live air traffic control data broadcast by aircraft and makes them available to researchers. OpenSky's data have been used by over 100 academic groups in the past 5 years, with popular research applications ranging from improved weather forecasting to climate analysis. With the COVID-19 outbreak, the demand for live and historic aircraft flight data has surged. Researchers around the world use air traffic data to comprehend the spread of the pandemic and analyse the effects of the global containment measures on economies, climate and other systems. With this work, we present a comprehensive air traffic dataset, derived and enriched from the full OpenSky data and made publicly available for the first time (Olive et al., 2020; https://doi.org/10.5281/zenodo.3931948, last access: 9 February 2021). It spans all flights seen by the network's more than 3500 members between 1 January 2019 and 1 July 2020. The archive is being updated every month and for the first 18 months includes 41 900 660 flights, from 160 737 aircraft, which were seen to frequent 13 934 airports in 127 countries.