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All Journal Journal of Oceanography BULLETIN OF THE MARINE GEOLOGY
Rizqi Ayu Farihah, Rizqi Ayu
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Earth & Planetary Sciences

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SEBARAN HORIZONTAL KONSENTRASI NITRAT DAN NITRIT PADA KONDISI PASANG SURUT DI PERAIRAN CILAUTEUREUN, GARUT Farihah, Rizqi Ayu; Maslukah, Lilik; Wulandari, Sri Yulina
Journal of Oceanography Vol 5, No 3 (2016)
Publisher : Program Studi Oseanografi, Jurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (324.624 KB)

Abstract

Perairan Cilauteureun di Kabupaten Garut merupakan Perairan yang banyak menerima masukan bahan organik dari aliran sungai dan hasil sampingan TPI Cilautereun yang merupakan TPI terbesar di Kabupaten Garut.Tujuan penelitian ini adalah melihat sebaran horizontal konsentrasi nitrat dan nitrit pada kondisi pasang surut di Perairan Cilauteureun. Metode yang digunakan dalam penelitian ini adalah metode kuantitatif, dengan teknik penentuan lokasi sampling menggunakan teknik Cluster samplingdengan titik pengambilan sample sebanyak 9 titik. Konsentrasi  nitrat dan nitrit dianalisa dengan menggunakan  metode SNI 06-2480-1991 (APHA 4500 NO3 Th. 1992) untuk nitrat dan metode SNI 06-6989.9-2004 untuk nitrit.Sebaran konsentrasi nitrat dan nitrit saat pasang dominan ke arah Barat Laut dan sebagian kecil ke arah Barat. Sedangkan sebaran pada saat surut arus mengalir dari arah Utara ke Selatan, kemudian arus karena adanya Pulau Santolo arus berbelok dari arah Barat Laut ke Tenggara. Hasil analisis statistik menunjukan bahwa kadar nitrat dan nitrit di Perairan Cilauteureun saat pasang dan surut adalah sama, karena perbedaan konsentrasinya yang sangat kecil.
ZOOPLANKTON DISTRIBUTION FROM BACKSCATTER DATA OF ADCP INSTRUMENT IN WEST SUMATRA WATERS Napitupulu, Gandhi; Farihah, Rizqi Ayu; Manik, Henry Munandar; Larasati, Oktavira Dwi Demia; Napitupulu, Moses; Bernawis, Lamona Irmudyawati; Radjawane, Ivonne Milichristi; Kusmanto, Edi
BULLETIN OF THE MARINE GEOLOGY Vol 39, No 2 (2024)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.39.2.2024.871

Abstract

Acoustic Doppler Current Profiler (ADCP) conventionally used to monitor ocean current profiles and potentially detect zooplankton distribution remains largely unexplored. Zooplankton are key consumers in the marine food chain, therefore understanding their distribution is critical. This study aims to map the distribution of zooplankton in West Sumatra waters using ADCP backscatter data. Data analyzed encompass ocean current measurements, backscatter, and conductivity-temperature-depth (CTD) profiles collected from March 1 to 3, 2017. Raw ADCP digital counts were converted into mean volume backscattering strength (MVBS) in dB using sonar equations, proportional to zooplankton biomass. The conversion process involved corrections for sound attenuation due to distance and water absorption, ADCP transducer angle correction, and noise correction. Processing results revealed zooplankton distribution in raw ADCP data ranging from 20 to 160 counts and in MVBS data spanning -140 dB to -40 dB. MVBS values derived from ADCP acoustic signal processing were filtered within the -100 dB to -60 dB range, representing the zooplankton backscatter range. Zooplankton distribution was observed at depths of 0-300 m. Vertical zooplankton distribution was generally high in the 100-200 m layer and decreased at 0-100 m and 200-300 m. This is attributed to the influence of the Equatorial Undercurrent transporting zooplankton biomass from the Indian Ocean to West Sumatra waters at depths of 100-200 m, characterized by high salinity (34.6-35.2 PSU) and cold temperatures (19°-21°C). This study demonstrates the utility of ADCP in observing zooplankton distribution based on their backscatter values and the influence of ocean currents in transporting zooplankton biomass.
Co-Authors Bernawis, Lamona Irmudyawati Edi Kusmanto Henry Munandar Manik Larasati, Oktavira Dwi Demia Lilik Maslukah Napitupulu, Gandhi Napitupulu, Moses Radjawane, Ivonne Milichristi Sri Yulina Wulandari