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Causes of marine heatwaves in the East China Sea and the South Yellow Sea in three consecutive summers during 2016-2018
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  • Guan-dong Gao,
  • Maxime Marin,
  • Ming Feng,
  • Baoshu Yin,
  • Dezhou Yang,
  • Xingru Feng,
  • Yang Ding,
  • Dehai Song
Guan-dong Gao
Institute of Oceanology, Chinese Academy of Sciences
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Maxime Marin
CSIRO
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Ming Feng
CSIRO Oceans and Atmosphere

Corresponding Author:[email protected]

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Baoshu Yin
Institute of Oceanology, Chinese Academy of Sciences
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Dezhou Yang
Institute of Oceanology, Chinese Academy of Sciences
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Xingru Feng
Institute of Oceanology, Chinese Academy of Sciences
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Yang Ding
Physical Oceanography Laboratory/CIMST, Ocean University of China and Qingdao National Laboratory for Marine Science and Technology
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Dehai Song
Key Laboratory of Physical Oceanography, Ministry of Education, China
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Abstract

In three consecutive years from 2016 to 2018, extreme ocean warming events, or marine heatwaves (MHW), occurred during boreal summers in the East China Sea (ECS) and South Yellow Sea (SYS), which was unprecedented in the past four decades based on the satellite record. In this study, we used a high-resolution hydrodynamic model based on FVCOM (Finite Volume Community Ocean Model) to simulate the evolution of these warming events. An upper ocean temperature budget (0-20m) analysis based on the model results shows that the shortwave radiation and the ocean advection anomalies jointly contributed to the anomalous warming in the three successive summers (June-August) in the SYS and the north part of the ECS. In addition, the reduction of surface wind speeds during the 2016 and 2017 summers further weakened the vertical mixing, thereby enhancing the anomalous warming in the north part of the ECS adjacent to the SYS. During the three summers, the increases of shortwave radiation were closely related to the East Asian Summer Monsoon variability, which reduced the cloud cover in the ECS and SYS, whereas the advection anomalies were mostly associated with regional wind anomalies. In summer 2018, upper ocean heat was transported into the central trough of the South Yellow Sea, accumulated in an anticyclonic eddy generated by the anomalous wind stress curls. Understanding the drivers of the MHWs can help MHW predictions in the coastal region, in order to help the fisheries and aquaculture industries to better manage the environmental risks under a warming climate.