Synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO) and their relation to IOD variability
This study focuses on the regional wind variability that controls the intensity of cold-water upwelling off Sumatra – a key feature of the Indian Ocean Dipole (IOD). Our analysis of daily atmospheric data reveals the existence of convectively triggered synoptic-scale atmospheric cyclones in the Sout...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
CSIRO Publishing
2022-01-01
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| Series: | Journal of Southern Hemisphere Earth Systems Science |
| Subjects: | |
| Online Access: | https://www.publish.csiro.au/es/pdf/ES22020 |
| _version_ | 1797978985997533184 |
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| author | Jochen Kämpf Ankit Kavi |
| author_facet | Jochen Kämpf Ankit Kavi |
| author_sort | Jochen Kämpf |
| collection | DOAJ |
| description | This study focuses on the regional wind variability that controls the intensity of cold-water upwelling off Sumatra – a key feature of the Indian Ocean Dipole (IOD). Our analysis of daily atmospheric data reveals the existence of convectively triggered synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO). The northern branch of the cyclones corresponds to westerly equatorial wind events, whereas the eastern branch involves north-westerly winds that operate to suppress cold-water upwelling off Sumatra’s west coast. Data for the period 1988–2022 show that 5–9 SETIO cyclones normally form each year during the boreal summer–autumn season, effectively suppressing upwelling in the region. In contrast, there are only few (1–2) cyclone events in years identified as positive phases of the IOD, when the absence of cyclones concurs with the development of strong coastal upwelling off Sumatra. Our findings suggest that the absence or presence of SETIO cyclones contributes to IOD variability. |
| first_indexed | 2024-04-11T05:31:45Z |
| format | Article |
| id | doaj.art-ad680ba3fa104459bda8d8a9b90c1ac8 |
| institution | Directory Open Access Journal |
| issn | 2206-5865 |
| language | English |
| last_indexed | 2024-04-11T05:31:45Z |
| publishDate | 2022-01-01 |
| publisher | CSIRO Publishing |
| record_format | Article |
| series | Journal of Southern Hemisphere Earth Systems Science |
| spelling | doaj.art-ad680ba3fa104459bda8d8a9b90c1ac82022-12-22T17:45:31ZengCSIRO PublishingJournal of Southern Hemisphere Earth Systems Science2206-58652022-01-01723191201ES22020Synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO) and their relation to IOD variabilityJochen Kämpf0Ankit Kavi1Flinders University, College of Science & Engineering, Adelaide, SA, Australia.Flinders University, College of Science & Engineering, Adelaide, SA, Australia.This study focuses on the regional wind variability that controls the intensity of cold-water upwelling off Sumatra – a key feature of the Indian Ocean Dipole (IOD). Our analysis of daily atmospheric data reveals the existence of convectively triggered synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO). The northern branch of the cyclones corresponds to westerly equatorial wind events, whereas the eastern branch involves north-westerly winds that operate to suppress cold-water upwelling off Sumatra’s west coast. Data for the period 1988–2022 show that 5–9 SETIO cyclones normally form each year during the boreal summer–autumn season, effectively suppressing upwelling in the region. In contrast, there are only few (1–2) cyclone events in years identified as positive phases of the IOD, when the absence of cyclones concurs with the development of strong coastal upwelling off Sumatra. Our findings suggest that the absence or presence of SETIO cyclones contributes to IOD variability.https://www.publish.csiro.au/es/pdf/ES22020atmospheric cyclonesatmosphere–ocean interactionscyclogenesisdaily variabilityequatorial wind eventsIndian Ocean Dipole |
| spellingShingle | Jochen Kämpf Ankit Kavi Synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO) and their relation to IOD variability Journal of Southern Hemisphere Earth Systems Science atmospheric cyclones atmosphere–ocean interactions cyclogenesis daily variability equatorial wind events Indian Ocean Dipole |
| title | Synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO) and their relation to IOD variability |
| title_full | Synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO) and their relation to IOD variability |
| title_fullStr | Synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO) and their relation to IOD variability |
| title_full_unstemmed | Synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO) and their relation to IOD variability |
| title_short | Synoptic-scale atmospheric cyclones in the South-East Tropical Indian Ocean (SETIO) and their relation to IOD variability |
| title_sort | synoptic scale atmospheric cyclones in the south east tropical indian ocean setio and their relation to iod variability |
| topic | atmospheric cyclones atmosphere–ocean interactions cyclogenesis daily variability equatorial wind events Indian Ocean Dipole |
| url | https://www.publish.csiro.au/es/pdf/ES22020 |
| work_keys_str_mv | AT jochenkampf synopticscaleatmosphericcyclonesinthesoutheasttropicalindianoceansetioandtheirrelationtoiodvariability AT ankitkavi synopticscaleatmosphericcyclonesinthesoutheasttropicalindianoceansetioandtheirrelationtoiodvariability |