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Open AccessArticle

The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean

by 1,2, 1,2,*, 1,2, 3 and 1,2
1
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, CAS, 164 West Xingang Road, Guangzhou 510301, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
*
Author to whom correspondence should be addressed.
Atmosphere 2018, 9(2), 69; https://doi.org/10.3390/atmos9020069
Received: 15 November 2017 / Revised: 6 February 2018 / Accepted: 9 February 2018 / Published: 15 February 2018
(This article belongs to the Special Issue Madden-Julian Oscillation)
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. View Full-Text
Keywords: South Tropical Indian Ocean; intraseasonal oscillation; SST; precipitation; thermocline; 30–50-day South Tropical Indian Ocean; intraseasonal oscillation; SST; precipitation; thermocline; 30–50-day
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MDPI and ACS Style

Liang, Y.; Du, Y.; Zhang, L.; Zheng, X.; Qiu, S. The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean. Atmosphere 2018, 9, 69. https://doi.org/10.3390/atmos9020069

AMA Style

Liang Y, Du Y, Zhang L, Zheng X, Qiu S. The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean. Atmosphere. 2018; 9(2):69. https://doi.org/10.3390/atmos9020069

Chicago/Turabian Style

Liang, Yun; Du, Yan; Zhang, Lianyi; Zheng, Xiaotong; Qiu, Shuang. 2018. "The 30–50-Day Intraseasonal Oscillation of SST and Precipitation in the South Tropical Indian Ocean" Atmosphere 9, no. 2: 69. https://doi.org/10.3390/atmos9020069

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