Judul: Analisis Kandungan Mikroplastik pada Pasir dan Ikan Demersal: Kakap (Lutjanus Sp.) dan Kerapu (Epinephelus Sp.) di Pantai Ancol, Palabuhanratu, dan Labuan
Abstrak: Mikroplastik adalah plastik berukuran kecil (≤ 5 mm) yang sulit terurai, sehingga membuat material ini akan tetap ada dalam jangka waktu yang lama. Tujuan penelitian ini adalah menganalisis komposisi mikroplastik di pasir pantai dan ikan demersal: ikan kerapu dan ikan kakap pada pantai Ancol, Palabuhanratu, dan Labuan. Mikroplastik diperoleh dengan dua cara, pertama dengan merendam pasir pantai dengan larutan NaCl jenuh, sebanyak 1 ml larutan diamati di bawah mikroskop cahaya dengan Sedgewick Rafter Counting Cell. Kedua dengan merendam usus ikan kakap dan ikan kerapu dengan campuran larutan asam nitrat dan asam perklorat, disaring, kemudian pelet diamati dengan mikroskop stereo. Berdasarkan hasil pengamatan visual, terdapat empat jenis komponen mikroplastik, yaitu fiber, film, fragmen, dan pelet. Rata-rata jumlah mikroplastik terbanyak terdapat pada pasir di pantai Palabuhanratu dengan rataan sebesar 525 partikel/mL. Kandungan mikroplastik pada usus ikan terbanyak dijumpai pada ikan kakap dengan rata-rata jumlah mikroplastik sebesar 10 partikel/ikan.
Keyword: fiber, film, fragmen, mikroplastik, Sedgewick Rafter Counting Cell

Judul: Analysis of Microplastic content on Sand and Demersal Fish: Beronang (Siganus sp.) and Ayam-ayam (Abalistes sp.) in Ancol, Palabuhanratu, and Labuan Beaches.
Abstrak: Plastik merupakan polimer dari unit monomer. Plastik yang bermuara di pantai apabila terpapar sinar matahari atau ultraviolet dalam jangka waktu yang lama akan terdegradasi menjadi mikroplastik dengan ukuran ≤5 mm. Mikroplastik kemudian akan mengendap di dasar laut. Mikroplastik dapat ditemukan di pasir dan organisme laut yaitu ikan. Sampel pasir diambil dengan hand corer, kemudian dianalisis di laboratorium menggunakan mikroskop majemuk untuk mengetahui kandungan mikroplastik. Untuk mengetahui kandungan mikroplastik pada ikan, saluran pencernaan diambil, kemudian dihancurkan dan dianalisis menggunakan mikroskop stereo. Mikroplastik yang dianalisis dibedakan berdasarkan jenisnya, yaitu fragmen, film, fiber, dan pellet. Jumlah rata-rata mikroplastik tertinggi pada pasir yaitu di wilayah Palabuhanratu sebanyak 525 partikel/mL, kemudian disusul Ancol sebanyak 406 partikel/mL, dan terakhir Labuan sebesar 207 partikel/mL. Begitu pula jumlah rata-rata mikroplastik pada ikan yang tertinggi berasal dari Palabuhanratu. Berdasarkan jenis ikan, kandungan mikroplastik pada ikan Siganus sp., yaitu 13 partikel/ikan, lebih banyak dari kandungan mikroplastik pada ikan Abalistes sp., yaitu 10 partikel/ikan.
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, fish, mikroplastic, plastic, sand, Mikroplastik dalam saluran pencernaan ikan

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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