VARIABILITAS SUHU PERMUKAAN LAUT DAN KONSENTRASI KLOROFIL-A DI SAMUDERA HINDIA BAGIAN TIMUR LAUT, BARAT SUMATERA
| Main Authors: | Nababan, Bisman, Sihombing, Evelyn Grace Br, Panjaitan, James P. |
|---|---|
| Format: | Article info application/pdf eJournal |
| Bahasa: | ind |
| Terbitan: |
Fakultas Perikanan dan Ilmu Kelautan
, 2022
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| Subjects: | |
| Online Access: |
http://journal.ipb.ac.id/index.php/jtpk/article/view/41314 http://journal.ipb.ac.id/index.php/jtpk/article/view/41314/23910 |
Daftar Isi:
- The variability of sea surface temperature (SST) and concentration of chlorophyll-a (Chl-a) in the Northeastern Indian Ocean west off Sumatra was studied using satellite data over a period of 22 years. The study used a combination of NOAA-AVHRR and MODIS data for SST, SeaWiFS and MODIS data for Chl-a, and monthly surface wind data from the European Center for Medium Range Weather Forecasts (ECMWF). Supporting data such as the monthly El Nino Southern Oscillation (ENSO) index and the Dipole Mode Index (DMI) were obtained from the web page of https://www.ncdc.noaa.gov/teleconnections/ enso/indicators/soi/ and https://www. jamstec.go.jp/virtualearth/general/en/index.html, respectively. The results showed that the range of SST during 22 years (1997-2019) was 27,57°C-34,41°C where the higher SST occurred during the West Season and Transition Season-1, while the lower values were found during the East Season and Transition Season-2. The negative IOD caused higher SST and lower Chl-a concentration than normal. Chl-a for 22 years ranged from 0,0757 mg/m3-1,3006 mg/m3 where higher Chl-a occurred start from the end of East Season (August) to early West Season (December), while lower values were found during Transition Season 1. The evidence of higher SST around Transition Season 1 (March-May) coincided with the evidence of lower Chl-a in the same seasons was due to negative IOD phenomenon. The variability of SST and Chl-a was influenced by the patterns of the seasonal wind, the water mass circulation, and IODM.
- Variabilitas suhu permukaan laut (SPL) dan konsentrasi klorofil-a (Chl-a) di Samudera Hindia bagian Timur Laut sebelah barat Sumatera diteliti menggunakan data satelit selama kurun waktu 22 tahun. Penelitian ini menggunakan gabungan data citra NOAA-AVHRR dan MODIS untuk SPL, data citra SeaWiFS dan MODIS untuk Chl-a, data angin permukaan bulanan diperoleh dari European Centre for Medium-Range Weather Forecasts (ECMWF). Data pendukung berupa indeks El Nino Southern Oscillation (ENSO) bulanan diperoleh dari laman https://www.ncdc.noaa.gov/teleconnections/enso/ indicators/soi/ dan Dipole Mode Index (DMI) bulanan diperoleh dari laman https://www.jamstec.go.jp/ virtualearth/general/en/index.html. Hasil penelitian menunjukkan bahwa SPL di daerah penelitian selama 22 tahun (1997-2019) berada pada kisaran 27,57°C-34,41°C. Nilai SPL yang lebih tinggi terjadi saat Musim Barat sampai Musim Peralihan-1, sementara nilai yang lebih rendah pada Musim Timur sampai Musim Peralihan-2. Variabilitas nilai SPL dipengaruhi oleh pola angin musiman, intensitas radiasi matahari, dan Indian Ocean Dipole Mode (IODM). Saat IOD Negatif menyebabkan nilai SPL yang lebih tinggi dan konsentrasi Chl-a lebih rendah dari biasanya. Konsentrasi klorofil-a selama 22 tahun berkisar antara 0,0757 mg/m3-1,3006 mg/m3, konsentrasi klorofil-a yang lebih tinggi terjadi saat akhir Musim Timur (Agustus) dan awal Musim Barat (Desember), sementara nilai yang lebih rendah saat Musim Peralihan-1. Tingginya SPL pada Musim Peralihan-1 (Maret-Mei) bersamaan dengan rendahnya Chl-a pada musim yang sama diduga akibat terjadinya fenomena IOD negatif. Variabilitas Chl-a dipengaruhi oleh pola angin musiman, pergerakan massa air, dan IOD.