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All Journal Jurnal Ilmu Pertanian Indonesia Buletin PSP Jurnal Teknologi Perikanan dan Kelautan Jurnal Ilmu dan Teknologi Kelautan Tropis MAJALAH ILMIAH GLOBE Albacore : Jurnal Penelitian Perikanan Laut Jurnal Kelautan Nasional International Journal of Remote Sensing and Earth Sciences (IJReSES)

Risti Endriani Arhatin

Department Of Marine Science And Technology, Faculty Of Fisheries And Marine Science, Bogor Agricultural University

Author-ID : 231639

Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Environmental Science Library & Information Science

Published : 11 Documents Claim Missing Document

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SPECTRAL OF REMOTE SENSING REFLECTANCE OF SURFACE WATERS Bisman Nababan; Anak A.G. Wirapramana; Risti E. Arhatin
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 5 No. 1 (2013): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Spectral measurements of remote sensing reflectance (Rrs) of surface waters in the northeastern Gulf of Mexico were conducted in various seasons in 1999-2000 using Fieldspec Analytical Spectral Devices (ASD) Spectroradiometer. Filtering process was performed on the data to eliminate invalid data. In general, in coastal waters particularly near rivers mouth (water type-2) the Rrs spectrals were relatively low at blue, maximum at green, and decreased to a minimum value at the red wavelength. In offshore waters (type-1), the general pattern of Rrs spectrals were maximum at the blue wavelength and then continued to decline at the green wavelength until the minimum value at the red wavelength except during summer where Rrs spectrals in most offshore area having the maximum value at the green wavelength due to the phytoplankton bloom as a result of freshwater intrusion from the Mississippi river. In general, the patterns and values of Rrs were significantly different among seasons and locations. Results showed that Rrs values at the blue wavelength (λ=400 nm) were generally higher in the spring than in other seasons ranging of 0.007-0.018 sr-1 in offshore waters and 0.004-0.015 sr-1 in coastal waters. During spring, Rrs values at the green wavelength (λ=500 nm) were also higher than in other seasons ranging of 0.005-0.013 sr-1 found in coastal waters. However, during summer in coastal waters, the maximum values of Rrs spectrals were found in different green wavelength on different locations showed the differences in the type and composition of phytoplankton, organic materials, and suspension matters at those locations. Keywords: remote sensing reflectance, phytoplankton, offshore, coastal, Gulf of Mexico

SEASONAL VARIABILITY OF LIGHT ABSORPTION COEFFICIENT OF SURFACE WATER Bisman Nababan; Denny A. Wiguna; Risti E. Arhatin
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 7 No. 2 (2015): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Absorption coefficient measurement can be used in estimating water quality, optical characteristic of water column, and marine bio-optical models. The purposes of this research were to determine values and variability of sea surface absorption coefficient in the northeastern Gulf of Mexico (NEGOM) based on various seasons. The data were collected in spring, summer, and fall seasons in 1999-2000 with AC-9 instrument. The spatial distribution of absorption coefficient showed that relatively high values were generally found along the run off Missisippi, Mobile, Chochawati, Escambia, Apalachicola, and Suwannee rivers, as well as Tampa Bay. Meanwhile, relatively low values were found in offshore region. This pattern followed the distribution pattern of chlorophyll and CDOM. Based on the local region comparison of spectral average value of absorption coefficient, we found a significant difference (α = 95%) among regions with the highest value in the run off of the Mississippi and Mobile rivers, and the lowest value in the offshore region. Comparison of spectral average value of absorption coefficient among seasons at the three primary wavelengths (blue=440 nm, green=510 nm, and red=676 nm) also showed a significant difference (α = 95%) with the highest value during the summer 1999 (Su-99) and the lowest value during the spring of 2000 (Sp-00). Absorption coefficient values were influenced by oceanographic factors that varied in every season such as wind, surface currents, upwelling, the location and speed of the Loop Current, and the river discharge of fresh water into the NEGOM.Keywords: absorption coefficient, seasons, chlorophyll, CDOM, northeastern Gulf of Mexico

Co-Authors Achmad Fachrudin Syah Afwan Syaugy Agustin Rustam Anak A.G. Wirapramana Bisman Nababan Denny A. Wiguna Djisman Manurung Dony Kushardono Hawis H Madduppa Jonson Lumban Gaol Jordan Tito Lubis Julia Eka Astarini Mujizat Kawaru Nabilla Dhani Amanda NEVIATY PUTRI ZAMANI Prihatin Ika Wahyuningrum Rahmavinda Aulia Putri Tri Wiji Nurani Veronica S.A. Louhenapessy Vincentius P Siregar Widya Octavia Yustie Amanda Zainal Arifin

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