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Xiao Ma, Qicheng Meng, Dewang Li, Yuanli Zhu, Xiaobo Ni, Dingyong Zeng, Di Tian, Ting Huang, Zhihao Jiang, Haiyan Jin, Feng Zhou. Coastal hypoxia response to the coupling of catastrophic flood, extreme marine heatwave and typhoon: a case study off the Changjiang Estuary in summer 2020[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2311-1
Citation: Xiao Ma, Qicheng Meng, Dewang Li, Yuanli Zhu, Xiaobo Ni, Dingyong Zeng, Di Tian, Ting Huang, Zhihao Jiang, Haiyan Jin, Feng Zhou. Coastal hypoxia response to the coupling of catastrophic flood, extreme marine heatwave and typhoon: a case study off the Changjiang Estuary in summer 2020[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2311-1

Coastal hypoxia response to the coupling of catastrophic flood, extreme marine heatwave and typhoon: a case study off the Changjiang Estuary in summer 2020

doi: 10.1007/s13131-024-2311-1
Funds:  The National Natural Science Foundation of China under contract Nos U23A2033 and 42230404; the National Program on Global Change and Air–Sea Interaction (Phase II) under contract No. GASI-01-CJK; the Key Research & Development Program of Zhejiang Province under contract No. 2022C03044; the Joint Funds of the Zhejiang Provincial Natural Science Foundation of China under contract No. LZJMZ23D050001; Long Term Observation and Research Plan in the Changjiang Estuary and the Adjacent East China Sea Project under contract No. SZZ2007; the Project of State Key Laboratory of Satellite Ocean Environment Dynamics under contract No. SOEDZZ2105; the Zhejiang Provincial Natural Science Foundation under contract No. LR16D060001, and the Zhejiang Provincial Ten Thousand Talents Plan under contract No. 2020R52038.
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  • Corresponding author: E-mail: zhoufeng@sio.org.cn
  • Received Date: 2023-09-20
  • Accepted Date: 2024-01-15
  • Available Online: 2024-04-29
  • Massive bodies of low-oxygen bottom waters are found in coastal areas worldwide, which are detrimental to coastal ecosystems. In summer 2020, the response of coastal hypoxia to extreme weather events, including a catastrophic flooding, an extreme marine heatwave, and typhoon Bavi, is investigated based on multiple satellite, four cruises, and mooring observations. The extensive fan-shaped hypoxia zone presents significant northward extension during July−September 2020, and is estimated as large as 13 000 km2 with rather low oxygen minimum (0.42 mg/L) during its peak in 28−30 August. This severe hypoxia is attributed to the persistent strong stratification, which is indicated by flood-induced larger amount of riverine freshwater input and subsequent marine heatwave off the Changjiang Estuary. Moreover, the typhoon Bavi has limited effect on the marine heatwave and coastal hypoxia in summer 2020.
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