A preliminary analysis of the characteristics and mechanisms for the recurrence of wintertime SST anomalies in the southern Indian Ocean

Dong Yue; Teng Hui; Qiu Yun; Lin Xinyu

doi:10.12284/hyxb2022043

Volume 44 Issue 6

Jul. 2022

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Dong Yue，Teng Hui，Qiu Yun, et al. A preliminary analysis of the characteristics and mechanisms for the recurrence of wintertime SST anomalies in the southern Indian Ocean[J]. Haiyang Xuebao，2022, 44(6)：37–47 doi: 10.12284/hyxb2022043

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A preliminary analysis of the characteristics and mechanisms for the recurrence of wintertime SST anomalies in the southern Indian Ocean

doi: 10.12284/hyxb2022043

Dong Yue^1
,,
Teng Hui¹,
Qiu Yun^{1
,
,},
Lin Xinyu¹

Ocean Dynamic Laboratory, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China

Received Date: 2021-05-21
Rev Recd Date: 2021-11-04

Available Online: 2022-07-13

Publish Date: 2022-07-13

Abstract

Abstract

This study mainly uses the GECCO2 reanalysis data from 1958 to 2016 to analyze the spatiotemporal characteristics of the southern Indian Ocean sea surface temperature anomalies (SSTA) winter-to-winter recurrence through lag correlation analysis, and investigate the roles of oceanic reemergence mechanism and atmospheric forcing. The results show that the winter-to-winter recurrence of SSTA occurs south of 15ºS in the southern Indian Ocean, especially between Madagascar and southwestern Australia (15º–45ºS, 70º–100ºE). The recurrence mainly occurs in the winter of the following year, but there are also some areas where the recurrence occurs in the following fall and continue to the subsequent winter. Further analysis shows that the difference between the deep winter mixed layer and shallow summer mixed layer, known as the oceanic reemergence mechanism, is the main cause of the recurrence of SSTA in the southern Indian Ocean. In addition, the net heat flux also directly contributes to the recurrence of SSTA in southern Madagascar and southwestern Australia.
- southern Indian Ocean,
- sea surface temperature,
- winter-to-winter recurrence,
- seasonal variability

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References

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