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1982 - 2021年孟加拉湾海洋热浪分析

Analysis of marine heatwaves over the Bay of Bengal during 1982-2021.

作者信息

Kumar Sudhanshu, Chakraborty Arun, Chandrakar Raghvendra, Kumar Abhishek, Sadhukhan Biplab, Roy Chowdhury Riyanka

机构信息

Centre for Ocean, River, Atmosphere and Land Sciences (CORAL), Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.

Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL, USA.

出版信息

Sci Rep. 2023 Aug 30;13(1):14235. doi: 10.1038/s41598-023-39884-y.

DOI:10.1038/s41598-023-39884-y
PMID:37648697
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10468509/
Abstract

Anomalous increase in sea surface temperature and its impact on natural ecosystems greatly interests the research community. Here we investigate the causes, impacts, and trends of marine heat wave (MHW) events in the Bay of Bengal (BoB) from 1982 to 2021. A total of 107 MHW events have been isolated (> 90th percentile threshold) in this Indian Ocean region, and their variation in intensity, duration, and frequency has been investigated. Our research unveils that an average of three MHW events/year accompanied by a linearly increasing trend of 1.11 MHW events/decade has been observed over the study region. It was also found that the most intense event was observed in 2016, which continued for 69 days, and had a maximum intensity of 5.29 °C and a mean intensity of 2.03 °C (above climatology mean). Moreover, it was observed that the net heat flux, along with anticyclonic eddies, was the primary cause of MHW events. Anticyclonic eddies associated with positive sea surface height anomaly were observed (> 0.20 m) in the vicinity of the most intense MHW event. Additionally, climate change and climate modes like El Niño and Indian Ocean Dipole show a high positive influence on the MHW events. Furthermore, we have examined the MHW event recurrence patterns in various regions of the BoB. From the monthly analysis, it was found that August and November had the most occurrences of MHWs, while April and May had the most extreme MHW events.

摘要

海面温度异常升高及其对自然生态系统的影响引起了研究界的极大兴趣。在此，我们调查了1982年至2021年孟加拉湾（BoB）海洋热浪（MHW）事件的成因、影响和趋势。在这个印度洋区域共分离出107次海洋热浪事件（超过第90百分位阈值），并研究了它们在强度、持续时间和频率上的变化。我们的研究表明，在研究区域内平均每年观测到三次海洋热浪事件，且伴随有每十年1.11次海洋热浪事件的线性增加趋势。还发现最强烈的事件发生在2016年，持续了69天，最大强度为5.29°C，平均强度为2.03°C（高于气候学平均值）。此外，观测到净热通量与反气旋涡旋一起是海洋热浪事件的主要原因。在最强烈的海洋热浪事件附近观测到与正海面高度异常相关的反气旋涡旋（>0.20米）。此外，气候变化以及诸如厄尔尼诺和印度洋偶极子等气候模态对海洋热浪事件显示出高度的正向影响。此外，我们研究了孟加拉湾不同区域的海洋热浪事件复发模式。通过月度分析发现，8月和11月海洋热浪事件发生次数最多，而4月和5月极端海洋热浪事件最多。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2216/10468509/e4430e31055a/41598_2023_39884_Fig13_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2216/10468509/8ddeee39efe9/41598_2023_39884_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2216/10468509/a72a47934d3d/41598_2023_39884_Fig9_HTML.jpg
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