A phytoplankton bloom caused by the super cyclonic storm Amphan in the central Bay of Bengal

IF 4.2 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Natural Hazards and Earth System Sciences Pub Date : 2023-08-16 DOI:10.5194/nhess-23-2807-2023

Haojie Huang, Linfei Bai, Haoyun Shen, Xiaoqi Ding, Rui Wang, Haibin Lü

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Abstract

Abstract. The super cyclonic storm Amphan originated in the central Bay of Bengal (BoB) in May 2020, and a phytoplankton bloom occurred in the upper ocean that was devoid of background nutrients. The dynamic mechanism of the chlorophyll a (Chl a) bloom was researched based on reanalysis data, remote sensing and Argo float data. During the passage of Amphan, an inertial oscillation with a 2 d period appeared in the thermocline and lasted for approximately 2 weeks. After the passage of Amphan, a cyclonic eddy with a maximum vorticity of approximately 0.36 s−1 formed in the study area (Box A). Additionally, horizontal transport of Chl a also occurred when the maximum inlet fluxes through the western and northern sides of Box A were 0.304 and −0.199 mg m−2 s−1, respectively. With the weakened thermocline and thinner barrier layer thickness (BLT), nitrate and Chl a were uplifted to the upper ocean by upwelling. Then, with the high photosynthetically available radiation (PAR) in the upper ocean, a phytoplankton bloom occurred. This study provides new insights into the biological responses in the BoB during the passage of tropical cyclones (TCs).

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在孟加拉湾中部，由超级气旋风暴安潘引起的浮游植物大量繁殖

摘要超级气旋风暴安潘于2020年5月起源于孟加拉湾中部(BoB)，在缺乏背景营养物质的上层海洋发生了浮游植物繁殖。利用再分析资料、遥感资料和Argo浮标资料，研究了叶绿素a (Chl a)华的动态机制。安潘通过期间，在温跃层中出现了一个周期为2 d的惯性振荡，持续时间约为2周。Amphan通过后，研究区形成了一个最大涡度约为0.36 s−1的气旋涡旋(框a)。此外，当通过框a西部和北部的最大进口通量分别为0.304和- 0.199 mg m−2 s−1时，Chl a也发生了水平输送。随着温跃层的减弱和屏障层厚度(BLT)的变薄，硝酸盐和Chl a通过上升流上升到上层海洋。然后，在高光合有效辐射(PAR)的上层海洋中，浮游植物发生了大量繁殖。这一研究为热带气旋通过过程中BoB的生物学反应提供了新的认识。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Natural Hazards and Earth System Sciences 地学-地球科学综合

CiteScore

7.60

自引率

6.50%

发文量

192

审稿时长

3.8 months

期刊介绍： Natural Hazards and Earth System Sciences (NHESS) is an interdisciplinary and international journal dedicated to the public discussion and open-access publication of high-quality studies and original research on natural hazards and their consequences. Embracing a holistic Earth system science approach, NHESS serves a wide and diverse community of research scientists, practitioners, and decision makers concerned with detection of natural hazards, monitoring and modelling, vulnerability and risk assessment, and the design and implementation of mitigation and adaptation strategies, including economical, societal, and educational aspects.