The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean
The Sea Surface Temperature (SST) in the South Tropical Indian Ocean (STIO) displays significant intraseasonal oscillation (ISO) in two regions. A striking 30–50-day ISO found over the east of thermocline ridge (Region A, 80–90° E, 6–12° S), as identified by the Empirical Mode Decomposition (EMD) me...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-02-01
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| Series: | Atmosphere |
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| Online Access: | http://www.mdpi.com/2073-4433/9/2/69 |
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| author | Yun Liang Yan Du Lianyi Zhang Xiaotong Zheng Shuang Qiu |
| author_facet | Yun Liang Yan Du Lianyi Zhang Xiaotong Zheng Shuang Qiu |
| author_sort | Yun Liang |
| collection | DOAJ |
| description | The Sea Surface Temperature (SST) in the South Tropical Indian Ocean (STIO) displays significant intraseasonal oscillation (ISO) in two regions. A striking 30–50-day ISO found over the east of thermocline ridge (Region A, 80–90° E, 6–12° S), as identified by the Empirical Mode Decomposition (EMD) method, is distinguished from the SST signature over the thermocline ridge (Region B, 52.5–65° E, 6–13° S). The 30–50-day ISO of SST in the Region A is active in March–May (MAM) and suppressed in September–November (SON). Meanwhile, a 30–50-day ISO of precipitation correlates with the SST over the Region A. SST leads precipitation by 10 days, implying a pronounced ocean–atmosphere interaction at the intraseasonal timescale, especially the oceanic feedback to the atmosphere during Madden–Julian Oscillation (MJO) events. Analysis on mechanism of the ISO manifests heat fluxes are critical to the development of the intraseasonal SST variability. The local thermocline in Region A, as the shallowest in MAM and the thickest in SON, is likely to modulate the strength of ISO and contribute to its sustainability. It suggests that thermocline plays a more important role in Region A than in Region B, leading to the difference between the two regions. |
| first_indexed | 2024-12-21T01:46:25Z |
| format | Article |
| id | doaj.art-5285ca4abc334be1b93b769bf8e2efd6 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-12-21T01:46:25Z |
| publishDate | 2018-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-5285ca4abc334be1b93b769bf8e2efd62022-12-21T19:20:01ZengMDPI AGAtmosphere2073-44332018-02-01926910.3390/atmos9020069atmos9020069The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian OceanYun Liang0Yan Du1Lianyi Zhang2Xiaotong Zheng3Shuang Qiu4State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, CAS, 164 West Xingang Road, Guangzhou 510301, ChinaState Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, CAS, 164 West Xingang Road, Guangzhou 510301, ChinaState Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, CAS, 164 West Xingang Road, Guangzhou 510301, ChinaCollege of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, ChinaState Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, CAS, 164 West Xingang Road, Guangzhou 510301, ChinaThe Sea Surface Temperature (SST) in the South Tropical Indian Ocean (STIO) displays significant intraseasonal oscillation (ISO) in two regions. A striking 30–50-day ISO found over the east of thermocline ridge (Region A, 80–90° E, 6–12° S), as identified by the Empirical Mode Decomposition (EMD) method, is distinguished from the SST signature over the thermocline ridge (Region B, 52.5–65° E, 6–13° S). The 30–50-day ISO of SST in the Region A is active in March–May (MAM) and suppressed in September–November (SON). Meanwhile, a 30–50-day ISO of precipitation correlates with the SST over the Region A. SST leads precipitation by 10 days, implying a pronounced ocean–atmosphere interaction at the intraseasonal timescale, especially the oceanic feedback to the atmosphere during Madden–Julian Oscillation (MJO) events. Analysis on mechanism of the ISO manifests heat fluxes are critical to the development of the intraseasonal SST variability. The local thermocline in Region A, as the shallowest in MAM and the thickest in SON, is likely to modulate the strength of ISO and contribute to its sustainability. It suggests that thermocline plays a more important role in Region A than in Region B, leading to the difference between the two regions.http://www.mdpi.com/2073-4433/9/2/69South Tropical Indian Oceanintraseasonal oscillationSSTprecipitationthermocline30–50-day |
| spellingShingle | Yun Liang Yan Du Lianyi Zhang Xiaotong Zheng Shuang Qiu The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean Atmosphere South Tropical Indian Ocean intraseasonal oscillation SST precipitation thermocline 30–50-day |
| title | The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean |
| title_full | The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean |
| title_fullStr | The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean |
| title_full_unstemmed | The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean |
| title_short | The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean |
| title_sort | 30 50 day intraseasonal oscillation of sst and precipitation in the south tropical indian ocean |
| topic | South Tropical Indian Ocean intraseasonal oscillation SST precipitation thermocline 30–50-day |
| url | http://www.mdpi.com/2073-4433/9/2/69 |
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