ACADSTAFF UGM
| Title | : | The Influence of Seasonal and Interannual Variability on Surface Chlorophyll-a Off the Western Lesser Sunda Islands |
| Author | : |
Dr.rer.nat. Riza Yuliratno Setiawan, S.Kel., M.Sc. (1) Dr. Eko Setyobudi, S.Pi., M.Si. (2) Anindya Wirasatriya (3) Andi Syahid Muttaqin, S.Si., M.Si., Ph.D. (4) Lilik Maslukah (5) |
| Date | : | 7 2019 |
| Keyword | : | Chlorophyll-a,ENSO,IOD,Lesses Sunda Islands Chlorophyll-a,ENSO,IOD,Lesses Sunda Islands |
| Abstract | : | Novel and long-term satellite data (2003–2017) are an- alyzed to investigate the variability of ocean surface chlorophyll-a (Chl-a) concentration off the Western Lesser Sunda Islands (WLSI) under the influence of the Indonesian Australian monsoon, the El Nin?o-Southern Oscillation, and the Indian Ocean Dipole (IOD). In this article, we first analyzed the seasonal variability of Chl-a, and then describe the relationship among the sea surface Chl-a, sea surface temperature (SST), and sea surface wind stress in the region. Our results demonstrate that prevailing southeasterly wind stress plays a pivotal role in generating the Chl-a maxima off the WLSI. Particularly on seasonal time scale, the strengthen- ing of southeasterly wind stress (up to ?0.01 N·m?2) during the southeast monsoon season produces enhanced Chl-a concentra- tions (0.59 mg·m?3) associated with sea surface cooling (?28.8 °C) in the area of study. In contrast, the Chl-a maxima completely vanished during the northwest monsoon season. On interannual time scale, the largest positive Chl-a and wind stress anomalies and the coolest SST anomaly are observed in 2006 when El Nin?o and positive IOD events occur at the same time. Meanwhile, the greatest negative Chl-a anomaly is prevailed during the 2016 negative IOD event. This article demonstrates that wind variability is the essential factor in determining the magnitude of the Chl-a maxima off the WLSI. |
| Group of Knowledge | : | Bidang Geofisika Lain yang Belum Tercantum |
| Original Language | : | English |
| Level | : | Internasional |
| Status | : |
Published
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