Seasonal variability and mechanism of marine heatwaves in the Bay of Bengal

Liang Kunming; Qiu Yun; He Yijun; Lin Wenshu; Ni Xutao; Teng Hui

doi:10.12284/hyxb2023075

Volume 45 Issue 6

Jun. 2023

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Liang Kunming，Qiu Yun，He Yijun, et al. Seasonal variability and mechanism of marine heatwaves in the Bay of Bengal[J]. Haiyang Xuebao，2023, 45(6)：13–24 doi: 10.12284/hyxb2023075

Citation:

Liang Kunming，Qiu Yun，He Yijun, et al. Seasonal variability and mechanism of marine heatwaves in the Bay of Bengal[J]. Haiyang Xuebao，2023, 45(6)：13–24 doi: 10.12284/hyxb2023075

Citation:

Liang Kunming，Qiu Yun，He Yijun, et al. Seasonal variability and mechanism of marine heatwaves in the Bay of Bengal[J]. Haiyang Xuebao，2023, 45(6)：13–24 doi: 10.12284/hyxb2023075

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Seasonal variability and mechanism of marine heatwaves in the Bay of Bengal

doi: 10.12284/hyxb2023075

Liang Kunming^{1, 2
,},
Qiu Yun^{1, 2
,
,},
He Yijun¹,
Lin Wenshu²,
Ni Xutao²,
Teng Hui²

1.
School of Marine Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China
2.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China

Received Date: 2022-08-24
Accepted Date: 2023-06-26
Rev Recd Date: 2022-12-17

Available Online: 2023-07-12

Publish Date: 2023-06-30

Abstract

Abstract

Based on the NOAA optimal interpolated sea surface temperature and other data from 1982 to 2021, seasonal variability of marine heatwave in the Bay of Bengal and associated formation mechanism were analyzed in this study. The results show that, bounded by the connection between Sri Lanka Island and the mouth of the Irrawaddy river in Myanmar, the frequency and days marine heatwave show different seasonal variation characteristics in the northwest and southeast of the Bay of Bengal. In the northwestern of the bay, both the frequency and the number of days of marine heatwaves are the largest in summer followed by spring and autumn, and the least in winter. In the southeastern of the bay, the seasonal variation of both is relatively weak. According to the cumulative intensity of marine heatwave, marine heatwaves are divided into four categories from weak to strong: I−IV. The analysis shows that the weak marine heatwave of category I and II mainly occurred in western or northwestern of the bay in summer and autumn; severe marine heatwaves of category 3 and above are mostly found in the Andaman Sea and the southeastern of the bay in spring and off southwestern Myanmar in summer. Further analysis shows that in most active areas of marine heatwaves in spring, summer and autumn, the change of net surface heat flux and the shallow mixed layer depth play a major role in these areas, while the formation and maintenance of marine heatwave in the southern of bay may be related to the remote forcing from the equator.
- marine heatwave,
- Bay of Bengal,
- seasonal variability,
- mixed layer,
- formation mechanism

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References(38)

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