bluuebunny/crossref_metadata_2025_split huggingface dataset:
Variability of ITF front at 115°E in the Eastern Indian Ocean: from 15-years Gridded CTD Argo Float Data
Authors: Susiani I , Atmadipoera A S , Nurjaya I W 
Published: January 2020

AbstractThis study aims to investigate a depth-latitude spatial and temporal variability of ITF front at 115°E, using 15-years (2004–2018) of monthly gridded CTD Argo float dataset in the Indo–Australia Basin. The Empirical Orthogonal Function method was performed to analysis these time-series data. It is shown that mean meridional extent of ITF front is established between 14°S and 10°S. The ITF front can be described by the first five modes of potential temperature and salinity EOF’s, which accounted for 88.6% and 80.7% of the total variance, respectively. The first EOF mode (67.9%) of depth-latitude temperature reveals spatial pattern which is out-of-phase between near-surface layer (<100 m) and thermocline layer, for example, during the northwest monsoon period, warmer and saltier water in the upper-layer and colder and fresher thermocline water are frequently observed, which differ to those observed during the southeast monsoon period. EOF principal components of temperature and salinity exhibit strong annual variation, followed by intraseasonal and interannual scales. On inter-annual scales, fluctuation of temperature and salinity is well correlated with ENSO and IODM, as previously expected.
Study of microfauna foraminifera as bioindicator for coral reef condition in Tambelan Island, Riau Island Province
Authors: Junita D R , Sartimbul A , Gustiantini L , Sahudin  
Published: January 2020

Abstract
Tambelan Islands is one of the coral reef habitats in Indonesia. This area is the southern part of Natuna Sea and South China Sea Throughflow (SCSTF) exit area, which influenced the dynamics of the ocean and climate in Indonesia. Foraminifera is one of the potential bioindicator that can be used to determine the conditions of waters and the environmental health of coral reef. Twenty surface sediment samples were taken and quantitative analysis were made in order to obtain the condition of waters. This analysis including calculation of abundance, community structure, and analysis of biozonation (cluster and SHEBI). Meanwhile, to determine the condition of coral reef was using FORAM Index (FI). The results showed that there were 52 species of benthic foraminifera included in 41 genera. The most abundant genera were Amphistegina (average 28.08%) and Operculina (average 23.85%) which were a type of genera that associated with coral reefs. The FI values range from 3.57–9.12 indicating that environmental conditions are conducive to coral reefs. Biozonation from the cluster and SHEBI showed different results, indicating that the abundance of foraminifera in research area are influenced by complex factors such as substrate conditions and the activities on land.
Influence of coastal upwelling on sea surface temperature trends Banda Sea
Authors: Rachman H A , Gaol J L , Syamsudin F , As-syakur A 
Published: January 2020

Abstract
The Banda Sea region is one of the locations in Indonesian waters that have high Coastal Upwelling intensity which related to the monsoon pattern. The calculation of Upwelling Index (UI) based on Wind data show that the peak coastal upwelling is from June to September. Analysis of SST trends was carried out in the July-September period based on NOAA OISST data from 1982-2017. The results show that there are differences in the value of SST trends that occur in the Coastal and Oceanic regions. In general, the SST trend in the Banda Sea waters has a positive value (warming) in both the coastal and ocean areas. While the UI trend in coastal and oceanic regions in the Banda Sea tends to decline from the 1982-2017 period. This condition shows that external factors quite influence oceanographic conditions in Banda Sea waters. It is also thought to have caused a decrease in the intensity of the upwelling trend found in the Banda Sea. The results show that the SST trend in the Banda Sea tends to increase during the peak upwelling season (June-September). Meanwhile, the Upwelling intensity trend shows a decreasing pattern which is also confirmed by decreasing trend in chlorophyll concentration.
Common reflection surface methods in low fold coverage seismic data of complex marine geological structures
Authors: Safitri D , Nainggolan T B , Manik H M 
Published: January 2020

Abstract
The primary objective of seismic data processing is to generate seismic cross-section with an optimum signal to noise ratio to model geological structures imaging as accurately as possible with the actual condition. However, we may look onto complex geological structures with less than adequate number of fold coverage seismic data. In this study, Common Reflection Surface (CRS) method is applied to generate 2D marine seismic cross-sections with better reflector continuity of 3 (three) real data seismic lines. It is based on obtaining the suitable aperture value along the attributes namely RN, RNIP, and a. Its results are compared to conventional Common Mid-Point (CMP) ones. The final products are presented in multiple- attenuated and time-migrated cross-section with Surface Related Multiple Elimination (SRME) and Kirchhoff Migration techniques, respectively. Comparison of final time-migrated both CRS and CMP stacks show the CRS method is more effective and reliable to model accurate complex marine geological structures with high signal to noise ratio based on reflector continuity and noise reduction.
Evaluation of ADCP backscatter computation for quantifying suspended sediment concentration
Authors: Manik H M , Gultom D A , Firdaus  , Elson L 
Published: January 2020

Abstract
Suspended sediment concentration (SSC) is important to measure for knowing photosynthesis activity and as indicator of marine pollution. Now days, measurement method to study about SSC were used conventional and optical techniques. These methods had a limitation in providing temporal data of SSC. Acoustic Doppler Current Profilers (ADCP) originally designed for measuring ocean current and its velocity profiles. In fact, ADCP is not only limited to measure the ocean current velocity and direction, but include measuring acoustic backscattering intensity which is related to the concentration of suspended sediment. Based on sonar equations, we computed and analysed the relationship between the backscattering intensity and suspended sediment concentration. In study area of Jakarta Bay, the highest SSC was 70 mgL−1 and the lowest SSC was 30 mgL−1. Compared to the traditional method, ADCP method has many advantages in providing spatial and temporal data.
Sound characteristic of Procambarus clarkii
Authors: Hisyam M , Hestirianoto T , Jaya I 
Published: January 2020

Abstract

Procambarus clarkii is one of the freshwater lobsters which has its own characteristics. Those characteristics used to identify Procambarus clarkii in nature. One of those characteristics is the sound which can be determined using the bioacoustic method. This research uses the bioacoustics method to obtain the sound characteristics from Procambarus clarkii considering this species is invasive in Indonesia. Sound characteristic of this species are obtained by processing sound data into FFT value. The results of processing sound data from recording for three days show that Procambarus clarkii produces snap sound with an average frequency range from 0.3-0.4 kHz.
Application of quantitative echosounder EK500 to detect fish density distribution in the waters at the eastern region of Alor Island
Authors: Izmiyaqin  , Jaya I , Manik H M 
Published: January 2020

Abstract
Information on fish resources and its distribution in the waters around Alor Island, East Nusa Tenggara is still relatively unknown. For that matter, the objective of this study is to determine the distribution of fish density horizontally (latitude or longitude) or vertically (depth) in the waters at the eastern region of Alor Island, using acoustic scientific echosounder SIMRAD EK500 instrument. This instrument is equipped with split beam echosounder transducer system with operating frequency of 38 kHz and 120 kHz. The acoustic survey was conducted in the waters off the north, east and south coast of eastern part of the Alor Island. The result of the survey showed that fish density detected in the surface water dominated by 0,1-100 individual/m3 fish density, in 60-80 meters depth was dominated by 0,1-10 individual/m3, and in 80-200 meters depth was dominated by 0,1-100 individual/m3 of fish density. In addition, the 38 kHz detect higher density of fish compare to 120 kHz.
Benthic habitat classification using high resolution satellite imagery in Sebaru Besar Island, Kepulauan Seribu
Authors: Siregar V P , Agus S B , Sunuddin A , Pasaribu R A , Sangadji M S , Sugara A , Kurniawati E 
Published: January 2020

Abstract
Remote sensing technology can provide spatial information for mapping shallow water benthic habitat, a case study conducted on Sebaru Besar Island. The purpose of this study was to analyze mapping accuracy of shallow water benthic habitats usings WorldView 2 and SPOT 6 (201 imageries). The classification of multispectral images is carried out using the Depth Invariant Index (DII) transformation and by applying the Maximum Likelihood (MLH) algorithm to both satellite images. The number of benthic habitat classes produced are eight habitat classes from each image used. The results of the analysis show that the overall accuracy in Worldview 2 and SPOT 6 images is 61.29% and 51.61%. Results of Z-statistic comparison between Worldview-2 and SPOT-6 imagery was 1,04, means that the results did not differ significantly.
Bigeye tuna fishing ground analysis using oceanographic features in Eastern Indian Ocean off Southern Java
Authors: Dewi A K , Gaol J L , Siregar V P , Atmadipoera A S 
Published: January 2020

Abstract
The Eastern Indian Ocean off Southern Java is one of the bigeye tuna fishing hotspots and has a fishing potential of 27%. Analyses of bigeye tuna fishing areas focus on the South Java-Bali waters at coordinates of 105°-120 ° E and 5 ° - 20 ° S. Oceanographic parameters affect the habitat of Bigeye tuna. Sub surface temperature is an important and major factor in fishing layers. Time series of sub surface temperature data from 2005-2017 was used as an input for the analysis of the fuzzy inference system method. This method has been widely used in fisheries areas but has not yet been applied to fishing ground predictions. The use of vertical temperature data variation such as 100 m, 150 m, 200 m, 250 m, and 300 m are expected to be able to map the most optimal fishing potential area for bigeye tuna fishing ground. The model output is verified using actual coordinate data to obtain a relationship between the model results and coordinate catch point. The result show that at 200 m is the best fishing layer of bigeye tuna.
Level of friendliness of the Bouke Ami fishing gear technology at the Nusantara Fishing Port (PPN) Kejawanan in Cirebon
Authors: Gumilang A P , Susilawati E 
Published: January 2020

Abstract
Squid nets technology (Bouke Ami) are the most used fishing gear by fishermen in the Nusantara Fishing Port (PPN) Kejawanan. This research was conducted in April 2019. The purpose of this study was to analyse the level of friendliness of the bouke ami fishing gear based on the Responsible Fisheries Ethics Code (CCRF). The research method used survey and indepth interviews with related parties related to the results of research and the level of friendliness of environmental equipment. Data analysis was carried out in accordance with 9 criteria for environmentally friendly fishing gear from the Food and Agriculture Organization (FAO). The results of the study showed that 27 species of bouke ami were captured with a total catch of 1,939 tons. The composition of the main catch is greater, which is equal to 82.69% compared to 17.31% bycatch. The value in the bouke ami environment is 27. Based on this value, the bouke ami is classified as a fishing gear which is categorized as an environmentally friendly fishing gear.
Design and implementation of waste cleaning automation system for the shrimp pond bottom
Authors: Sefto  , Jaya I , Iqbal M 
Published: January 2020

Abstract
In intensive shrimp cultivation system, residual waste that settled at the bottom of the pond is impacting water quality. Therefore, there is a need to regularly clean this residual to maintain the water quality in good condition. In this paper we describe the automatic instrument system to clean up the bottom of the pond. This waste cleaning instrument uses the principle of equilibrium between the main component in the form of a pyramid and supporting components, namely the water container. The pyramid has a dimension of 2x2x1.3m and 4 poles that serve as rails and support for pulleys that hang both components. The framework of the pyramid is made of pipes and then the frame is coated with HDPE sheets and solar flat. The pyramid will go up and down in accordance with the water container, if it is filled with water and empty automatically because it is installed two submersible pumps to drain and fill the water container. From the field test results it was found that this instrument works effectively, where in one cleaning, it can be done in less than 5 minutes compared to conventional cleaning which takes hours.
Seasonally volume, heat, salt and freshwater transports within Balikpapan Bay to Makassar Strait
Authors: Sulardi A , Nurjaya I W , Hartanto M T 
Published: January 2020

Abstract
Study about water mass transport within Balikpapan Bay (BB) is crucial since many watersheds discharge from this bay which directly flows into Makassar Strait. To understand transport of water mass within BB, INDESO data was made monthly in 2015. The annual volume, heat, salt and freshwater transport are estimated to be 18.02 mSv, 2.14 PW, 0.64 x 109 kgs-1, and 1.05 mSv, respectively. Compared to the annual mean volume transport of Makassar Strait (6.4 Sv), the annual transport of water mass from BB is likely contribute less amount of volume and heat transport with the weighted-transport temperature at 30.37 °C. They are somewhat smaller than the difference between each season. This difference may be attributed by the external force, i.e. current circulation and tidal wave, as well as the precipitation along BB.
Study on shoreline changes using Landsat imagery in Sangsit Region, Bali Province
Authors: Natih N M N , Pasaribu R A , Sangadji M S , Kusumaningrum E E 
Published: January 2020

Abstract
This study was conducted to observe the dynamic of shoreline changes in Sangsit Region, Bali Province using multi-temporal remote sensing datasets. The remote sensing data were acquired from several Landsat images in the period of 2000-2019 (20 years) with 30-meter spatial resolution. Digital Shoreline Analysis System (DSAS) method was used to analyse data images to determine the shoreline changes. Prior to the analysis, the images were corrected by ground check data. It revealed that the shoreline changes has occur in Sangsit Region for period of 20 years (2000-2019). The results obtained indicate that there is a change in shoreline with mild accretion to less extreme abrasion categories which occurred in the Sangsit Region in that period. From 2000-2005 it shows an accretion of 221.03 m which is categorized as mild accretion and from 2005-2019 the shoreline changes that occur is only an abrasion its categorized as mild to less extreme abrasion. The highest abrasion occurred in the period of 2010-2015 which the abrasion is around 49.65 m.
Mangrove density level and area change analysis in small islands case study: Untung Jawa Island, Seribu Islands, DKI Jakarta
Authors: Pasaribu R A , Cakasana N , Maduppa H , Subhan B , Arafat D , Sangadji M S , Savana M S 
Published: January 2020

Abstract
This study was conducted to analyze the changes in mangrove area and the density level of mangrove based on satellite imagery and field surveys in Untung Jawa Island. The image data used was Landsat image data acquired in 2000, 2005, 2010, 2015 and 2019. Apart from those, sentinel-2 data received in April 2019 were also retrieved to be compared with field data to see the density level and its accuracy. Image analysis to determine the area and density of mangroves was the Normalized Difference Vegetation Index (NDVI) model. Measurement of mangrove vegetation in the field was obtained by the line plot transect method. The results of temporal image data analysis showed the changes in mangrove area from 2000 (8.46 ha), 2005 (7.56 ha), 2010 (8.45 ha), 2015 (10.65 ha) and 2019 (6.89 ha). In 2019 the mangrove density was dense, while the result of the field survey was categorized as very dense. The level of accuracy for density using remote sensing data is 92.5%. Through the results of the field survey, the mangrove diversity was relatively low, mangrove species on the island was very uneven, and the dominant species was Rhizophora mucronata.
Some biology aspects of Indian Scad (Decapterus russelli, Rupell, 1928) in Pemangkat Fisheries Port, West Kalimantan
Authors: Faizah R , Sadiyah L 
Published: January 2020

Abstract
Absrtact. Indian Scad (Decapterus russelli, Rupell, 1928) is one of small pelagic fish that have important values in the south of China Sea. The objective of the study was to investigate some biology aspects of Indian scad caught by purse seine in the south of China Sea. The research was conducted from March to August 2014. This study used 395 fish samples with size between 14.1-21.9 cmFL (average 18.9 cmFL) and the sex ratio between female and male was 1:1.09. The growth patterns of Indian scad for male and female were positive allometric expressed by the following equation: W=0.0093L3.1309 (R2=0.8719) for male and W=0.0094L3.1359 (R2=0.8576) for female. The condition factors were about 0.25-6.22. Indian scads observed ranged between Maturity stage I and maturity stage V with GI for male and female were 0.056–6.36 % and 0.09 – 6.35 %, respectively. The Von Bertalanffy Growth Equation of Indian scad in the South of China Sea was Lt = 23.60 (1 - e 0.6(t+-0.2789)) with the length of infinity (L∞)=23.60 cmFL, coefficient of growth (K) = 0.6 year-1 and the theoretical age (t0) Indian scad that was equal to (t0) = - 0.2789.
Nutritional value and mineral content of seaweed from Binuangeun Beach, Indonesia and potential use as fish feed ingredient
Authors: Suryaningrum L H , Samsudin R 
Published: January 2020

Abstract
Seaweed represents an important economical resource in Indonesia. They are potentially as good source of nutrient. Furthermore, they have the most nutritious and rich in mineral than any other feedstock. The levels of minerals are ten to twenty times from total mineral content of terrestrial plants. This experiment was carried out to evaluate the nutritional value and mineral content of several seaweeds namely Caulerpa, Palmaria and Ulva, in order to utilize as fish feed ingredient. Seaweeds were collected from Binuangeun Beach, Banten and south coast of Java Island. Carbohydrate by different (NFE) and ash contents were the most two abundant components. Seaweeds Caulerpa, Palmaria and Ulva contained 44.73%, 53.74%, 55.31% NFE; and 27.36%, 22.81%, 20.51% ash based on dry weight, respectively. These contained high amounts of Na, K, Ca, and Mg ranged 0.72-5.65 g 100g−1, Fe, Mn, Cu, and Zn ranged 2.09x10−4-0.09 g 100g−1. The quantity of the bio-essential elements (Fe, Zn, Cu) followed as Fe>Zn>Cu. The iron content was rich in the sequence of Caulerpa>Palmaria>Ulva and its range was found to be 0.01-0.09 g 100 g−1 in dry weight. The result showed that Caulerpa, Palmaria and Ulva are valuable resource and potentially to be utilized as fish feed ingredient.
Monitoring mangrove phenology using camera images
Authors: Xiang Qiyue , Zhou Yulun , Liu Jiangong 
Published: January 2020

Abstract
Mangrove conservation is known as a significant means of sequestering atmospheric carbon dioxide to help mitigate climate change. Recently, a network called “Phenocam” has initiated the use of low-cost camera photos to monitor vegetation phenology world-wide. Despite that Phenocam has been proved to be feasible and useful for many tree species, to the authors’ knowledge, the Phenocam approach has not been tested on mangroves. In this paper, we first collected two months of repeated digital camera photos capturing mangroves in the Mai Po Nature Reserve (MPNR), Hong Kong. Then, vegetation indices were extracted from the camera photos and validated with in situ measured NDVI. The feasibility, effectiveness, and potential biases of using camera photos to monitor the phenology of mangroves are discussed.
Dynamics and spatial differentiation of dissolved copper load in the Yangtze estuary
Authors: Hua Wang , Ying-ying Tian , Feng-nian Zhou , Bao Li , Yi-chuan Zeng , Xiao-yu Zhang 
Published: January 2020

Abstract
Taking the Yangtze river estuary as the study area and based on the field measured data of the longest sequence from 2004 to 2018, analyzes the Dissolved Copper (DCu) concentration change process of six typical sections in the Yangtze river estuary in the past 15 years, namely, Xuliujing, Shidongkou, Nangang, Beigang, Qinglonggang and Qidonggang. The characteristics of the evolution trend of each section are quantitatively evaluated by the method of restandard range analysis. The spatial differentiation rules of DCu in the Yangtze river estuary at different stages were revealed and the correlation characteristics of each section load were calculated by Pearson coefficient. The results show that :(1) the evolution characteristics of DCu in the section of Xuliujing section are relatively complex, which can be divided into four stages. The average concentration of DCu in 15 years is about 3.52 μg/L, and the highest monthly average concentration is 17.8 μg/L.(2) due to the effect of regional sewage discharge, the load of DCu in the mouth section of the south branch stone is generally higher than that of the Nangang and Beigang sections, but the evolution trend of the three sections is basically similar. The oscillation amplitude of DCu concentration in Qidonggang section is the most significant. In 2007, the annual average value of DCu reached 30.3 μg/L, which is the highest annual average value in the existing measured data.(3) Hurst index of Nangang and Qidonggang reached 0.93 and 1.0 respectively, and the evolution trend of cross section DCu showed a strong persistence. The Hurst index of Qinglonggang section is 0.1515, which indicates that the section DCu has anti-persistence.(4) except Qidonggang, the DCu in the other five monitored sections all show significant positive correlation, among which the DCu concentration in Beigang and Qinglonggang have extremely similar variation rules. The main reason for this strong correlation should be related to the main driving weight factor of DCu load in the two sections. The research results have some reference value for prevention and control of heavy metal pollution in Yangtze estuary.
Towards the development of the information system for the long-term planning of infrastructure in the Artic zone of the Russian Federation in the context of climate change
Authors: Konovalov A M , Namsaraev Z B , Baturova G V 
Published: January 2020

Abstract
The article presents the rationale for the creation of an information system for long-term planning of infrastructure development in the Arctic in the context of global climate change. The system will be focused on supporting decision-making in the interests of the effective infrastructure development of the Arctic zone of the Russian Federation - the country’s key macro-region, which plays a significant role in the socio-economic development of Russia.