Can Coastal Upwelling Trigger a Climate Mode? A Study on Intraseasonal‐Scale Coastal Upwelling Off Java and the Indian Ocean Dipole
Abstract Coastal upwelling along the southern coast of Java brings cold and nutrient‐rich subsurface water to the surface. We explored whether the upwelling could trigger the onset of the Indian Ocean Dipole (IOD) by supplying cold water to the southeastern tropical Indian Ocean. We used satellite‐b...
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| Format: | Article |
| Language: | English |
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Wiley
2022-08-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2022GL098733 |
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| author | T. Horii E. Siswanto I. Iskandar I. Ueki K. Ando |
| author_facet | T. Horii E. Siswanto I. Iskandar I. Ueki K. Ando |
| author_sort | T. Horii |
| collection | DOAJ |
| description | Abstract Coastal upwelling along the southern coast of Java brings cold and nutrient‐rich subsurface water to the surface. We explored whether the upwelling could trigger the onset of the Indian Ocean Dipole (IOD) by supplying cold water to the southeastern tropical Indian Ocean. We used satellite‐based daily chlorophyll‐a concentration (Chl‐a) data during 2003–2020 as a proxy of the coastal upwelling. We focused on first Chl‐a bloom that occurred in April‐June, the onset phase of the positive IOD (pIOD). We found that the timing and strength of the upwelling signals were significantly correlated with the subsequent IOD peaks. We diagnosed processes associated with the upwelling affecting sea surface temperature (SST) in the southeastern Indian Ocean. Results indicate that after the cold‐water upwelling south of Java, westward surface temperature advection plays a role in anomalously cooling the SST in the southeastern Indian Ocean and setting a favorable condition for the subsequent pIOD development. |
| format | Article |
| id | doaj-art-8cb824bad4ae466e95b2eb4f5e7e708d |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-8cb824bad4ae466e95b2eb4f5e7e708d2025-08-20T02:27:42ZengWileyGeophysical Research Letters0094-82761944-80072022-08-014915n/an/a10.1029/2022GL098733Can Coastal Upwelling Trigger a Climate Mode? A Study on Intraseasonal‐Scale Coastal Upwelling Off Java and the Indian Ocean DipoleT. Horii0E. Siswanto1I. Iskandar2I. Ueki3K. Ando4Global Ocean Observation Research Center Research Institute for Global Change Japan Agency for Marine‐Earth Science and Technology Yokosuka JapanEarth Surface System Research Center Research Institute for Global Change Japan Agency for Marine‐Earth Science and Technology Yokohama JapanFaculty of Mathematics and Natural Sciences Sriwijaya University Palembang IndonesiaGlobal Ocean Observation Research Center Research Institute for Global Change Japan Agency for Marine‐Earth Science and Technology Yokosuka JapanGlobal Ocean Observation Research Center Research Institute for Global Change Japan Agency for Marine‐Earth Science and Technology Yokosuka JapanAbstract Coastal upwelling along the southern coast of Java brings cold and nutrient‐rich subsurface water to the surface. We explored whether the upwelling could trigger the onset of the Indian Ocean Dipole (IOD) by supplying cold water to the southeastern tropical Indian Ocean. We used satellite‐based daily chlorophyll‐a concentration (Chl‐a) data during 2003–2020 as a proxy of the coastal upwelling. We focused on first Chl‐a bloom that occurred in April‐June, the onset phase of the positive IOD (pIOD). We found that the timing and strength of the upwelling signals were significantly correlated with the subsequent IOD peaks. We diagnosed processes associated with the upwelling affecting sea surface temperature (SST) in the southeastern Indian Ocean. Results indicate that after the cold‐water upwelling south of Java, westward surface temperature advection plays a role in anomalously cooling the SST in the southeastern Indian Ocean and setting a favorable condition for the subsequent pIOD development.https://doi.org/10.1029/2022GL098733Indian Ocean dipolecoastal upwellingJavachlorophyll‐amulti‐scale interactionclimate |
| spellingShingle | T. Horii E. Siswanto I. Iskandar I. Ueki K. Ando Can Coastal Upwelling Trigger a Climate Mode? A Study on Intraseasonal‐Scale Coastal Upwelling Off Java and the Indian Ocean Dipole Geophysical Research Letters Indian Ocean dipole coastal upwelling Java chlorophyll‐a multi‐scale interaction climate |
| title | Can Coastal Upwelling Trigger a Climate Mode? A Study on Intraseasonal‐Scale Coastal Upwelling Off Java and the Indian Ocean Dipole |
| title_full | Can Coastal Upwelling Trigger a Climate Mode? A Study on Intraseasonal‐Scale Coastal Upwelling Off Java and the Indian Ocean Dipole |
| title_fullStr | Can Coastal Upwelling Trigger a Climate Mode? A Study on Intraseasonal‐Scale Coastal Upwelling Off Java and the Indian Ocean Dipole |
| title_full_unstemmed | Can Coastal Upwelling Trigger a Climate Mode? A Study on Intraseasonal‐Scale Coastal Upwelling Off Java and the Indian Ocean Dipole |
| title_short | Can Coastal Upwelling Trigger a Climate Mode? A Study on Intraseasonal‐Scale Coastal Upwelling Off Java and the Indian Ocean Dipole |
| title_sort | can coastal upwelling trigger a climate mode a study on intraseasonal scale coastal upwelling off java and the indian ocean dipole |
| topic | Indian Ocean dipole coastal upwelling Java chlorophyll‐a multi‐scale interaction climate |
| url | https://doi.org/10.1029/2022GL098733 |
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