1,720,978 research outputs found
Mangrove Forest Change in Nusa Penida Marine Protected Area, Bali - Indonesia Using Landsat Satellite Imagery
Full text linkHlm.141-15
Quantitative Comparison of Algorithms for Estimating the Air-sea Exchange of Carbon Dioxide in Malacca Straits
Full text linkA precise quantification of the sea surface partial pressure of carbon dioxide (pCO2(water)) at the water surface is required in order to define the role of the sea in air-sea exchange of CO2. Even though the pCO2(water) can be measured directly, the semi-empirical model has seen numerous application in determining the pCO2 (water) due to a time-and cost-efficient. This study aims to compare the pCO2 and FCO2 (Flux of CO2) calculated using Zhai and Zhu algorithm with the underway datasets of pCO2 obtained during the scientific cruise of CISKA-SPICE III in April 2013. The partial pressure of CO2 (pCO2) was measured using a high-accuracy electrochemical instrumentation underway HydroC/CO2 FT (flow through) with an error ±1 μ atm. Furthermore, in order to calculate the pCO2 and the FCO2 employing widely used algorithms, some data were needed including wind speed, sea surface temperature and chlorophyll-a extracted from MODIS (Moderate Resolution Imaging Spectroradiometer). According to the results obtained, the difference between the pCO2 and FCO2 derived from those two algorithms are significant. The underway datasets of pCO2 are ranging from 409.52-544.01 µatm. Meanwhile, the pCO2 derived using the Zhai algorithm and Zhu algorithm are between 405.003–422.79 µatm and 398.94-752.06 µatm respectively. The FCO2 are varied between 0.02–0.06 molC.m-2.day-1 (Zhai algorithm), 0.02-0.57 molC.m-2.day-1 (Zhu algorithm) dan 0.04-0.23 molC.m-2.day-1 (the underway datasets). A comparison of the two results reveals that pCO2 derived using Zhai algorithm is closer with the underway datasets compared with the result of pCO2 calculated using Zhu algorithm with the MRE (Mean Relative Estimation Error) as large as 19.4% and 39% respectively. Taken together, these results suggest that the Zhai algorithm is more appropriate to determine algorithms for estimating the air-sea exchange of carbon dioxide in the Malacca Straits.
Keywords: carbon dioxide, Malacca Straits, pCO2, FCO2, Zhai and Zhu algorith
Identifikasi Penjalaran Gelombang Panjang Samudera Hindia Ke Selat Lombok Berdasarkan Komponen Harmonik Arus
No full textThe Lombok Strait is one area passing by seawater mass from Pacific Ocean to Indian Ocean, well known as Indonesia Through Flow (ARLINDO). It was profen by the existane of long periode harmonic current component affected by the sun (SA, SSA ) , and an influence by moon (MSF). The harmonic current speed has an average of 0.370668 m/s in the depths of 100 meters during January 9, 2004 until 14 June 2005 (1.5 years). Time series data ocean current of INSTANT project (2004-2005) is used in this research, analized by using toolbox module of t-tide 1.3 beta. The current rose at 350 meters deep and 450 meters deep shous pattern of the a unique ocean current, which mastly toward to north and northeast (55 %) with velocity at 0.2-1.0 m/s. The current is coming from Indian Ocean which proven by the existence of components like M4, MS4, MSF, O1. There is also ocean current toward to south and southwest as (45 %) with speed of 0.11-0.9 m/s. Thie ocean current which coming from Indian Ocean is indication of propagation of long wave penetration to Lombok Strait. During its propagation passing the sill, the wave become an internal wave in Lombok Strait.
Keywords: internal wave, indian ocean, lombok strait, harmonic currents component, INSTANT 2004-200
Sea-Air Impacts on Fishing Season of Hand Line Skipjack Tuna Katsuwonus pelamis (Linnaeus, 1758) in Pacitan Coastal Waters of The South Eastern Indian Ocean
No full textFishing season is important in term of understanding the catch dynamics however, by far the analysis never considered environmental variables into the calculation. The environmental variables in this case is addressed to sea-air interactions during 2012-2015, i.e. monthly wind, surface wind wave, and precipitation level. This study aimed the alternative, yet breakthrough on using Generalized Linear Model (GLM) to analyse the fishing season of skipjack tuna caught by small-scale hand line fleet. The result showed that GLM can be a good alternative in term of predicting the fishing season of skipjack tuna. It provided a good understanding with the surrounded environmental variables. Skipjack tuna fishing season starts from March, reach its peak in April and October. The low season is Februari, June and September. Local weather (wind speed) and religious affair (FastIed) significantly affected the fishing behavior thus lead to dynamics of CPUE obtained.
Keywords: sea-air; fishing season; hand line; skipjack; Pacitan coastal waters; south eastern Indian Ocean; CPUE, GLM, small-scal
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Peningkatan Data Tinggi dan Kecepatan Hanyut Gelombang pada Sistem Informasi Fusi Oseanografi STTAL: Improved Wave Height and Drift Velocity Data on The STTAL Oceanographic Fusion Information System
Full text linkSistem Aplikasi Basis Data Fusi Oseanografi merupakan hasil kerjasama antara STTAL dengan Marine Coastal Data Laboratory (MCDL) Pusat Riset Penelitian Kelautan dan Perikanan dan Badan Riset Inovasi Nasional (BRIN) pada tahun 2019 yang bertujuan untuk pengelolaan data observasi dan teknologi prediksi Oseanografi Nasional. Pengembangan yang berkelanjutan dengan menambahkah variabel baru seperti Gelombang Angin dan Kecepatan Hanyut Gelombang sangat di butuhkan dalam pemutakhiran Basis Data. Dalam Tugas Akhir ini dilaksanakan pengolahan data Gelombang Angin dan kecepatan Hanyut Gelombang Permukaan selama tahun 2021 dan 2022. Data penelitian bersumber dari Copernicus Marine Environment Monitoring Service (CMEMS). Gelombang tersebut kemudian di olah menggunakan software ODV versi 5.3.0 untuk menghasilkan peta Gelombang Angin dan Kecepatan Hanyut Gelombang dan dilakukan komputasi menggunakan Software Microsoft Excel untuk mengetahui nilai dari Kecepatan Hanyut Gelombang Permukaan. Hasil pengolahan selanjutnya di unggah kedalam Basis Data Fusi Oseanografi untuk ditampilkan pada Aplikasi Android Fusioseanografi V4 untuk dapat di akases bagi pengguna. Penelitian ini menghasilkan peta variabel Gelombang Angin dan Kecepatan Hanyut Gelombang permukaan yang di aplikasikan kedalam 12 WFO disetiap tahun dengan setiap WFO berjumlah 12 bulan dengan setiap bulannya berjumlah 1 gambar. Pengolahan selama 2 tahun sehingga menghasilkan peta hasil ploting sejumlah 288 gambar. Hasil penelitian selama 2 tahun didapatkan nilai tertinggi Gelombang Alun berada di bulan Desember 2021 dan bulan Maret di tahun 2022. Keduanya memiliki tinggi Gelombang 4m. Himbauan untuk keselamatan pelayaran pada bulan ini sangat penting mengingat gelombang yang berbahaya bagi keselamatan pelayaran
Seasonal Variability of Thermocline, Sound Speed & Probable Shadow Zone in Sunda Strait, Indonesia
No full textThe Sunda Strait is an important strait connecting Karimata and Java Seas with the Indian Ocean. The Sunda Strait is one of the busiest International Sea-lane in Indonesian Archipelago (ALKI). That is used for commercial shipping lanes and possibly for the military (submarines) cruise. For submarine operational purposes, a physical oceanographic dataset is needed which consisting of temperature, salinity, and sound speed. This article is analysing the seasonal variablity of thermocline and sound speed, including a shadow zone estimation. The 0.1 deg C gradient is applied for the thermocline layer determination during four seasons data in 2014. The dataset of INDESO Project (daily, 1/12 deg) has been used. In the North-West Season (January), thermocline layer (28 - 13.5 deg C) occurs at 77 - 155 m depth, has a range of 1,542 - 1,504 m/s sound speed. Those reveals shallower (40 - 130 m depth) of the thermocline layer (29 - 15.8 deg C) during the first Transitional Season (April), with the sound speed range 1,541 - 1,511 m/s. During South-East Season (July), the thermocline layer (29 - 15.4 deg C) has been deeper again (65 - 155 m depth), with 1,542 - 1,550 m/s of sound speed. While during the Second Transitional Season (October), the upper limit of thermocline layer (27 - 13.6 deg C) is a little bit shallower (55 - 155 m depth), with the sound speed range of 1,538 - 1,504 m/s. In annual average, the thermocline (29 - 13.6 deg C) in Sunda Strait laying in between an upper limit layer of 40 - 70 m depths and a bottom limit layer of 130 - 155 m depth. Those layers depth are estimated to be a probable shadow zone area with the sound speed range upper limit of 1,542 m/s. and the lower limit of 1,504 - 1,511 m/s
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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