The Formation of a Surface Anticyclone over the Yellow and East China Seas in Spring

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  • ZHANG Su-Ping
    Physical Oceanography Laboratory, and Ocean–Atmosphere Interaction and Climate Laboratory, Ocean University of China
  • LIU Jing-Wu
    Physical Oceanography Laboratory, and Ocean–Atmosphere Interaction and Climate Laboratory, Ocean University of China
  • XIE Shang-Ping
    Department of Meteorology and International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii
  • MENG Xian-Gui
    Physical Oceanography Laboratory, and Ocean–Atmosphere Interaction and Climate Laboratory, Ocean University of China

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A surface anticyclone develops in April over the Yellow-East China Seas. The Yellow-East China Sea anticyclone (YESA) is confined in the marine atmospheric boundary layer but highly influential during the onset of sea fog season along the Chinese coast. This paper investigates the mechanism for YESA formation using atmospheric reanalysis, satellite observations and model experiments. Our analysis indicates that YESA is composed of three parts: (1) the westerlies to the north are the surface extension of the westerly wind jet; (2) the southerlies on the Chinese coast are due to the thermal wind between the warm continent and cool Yellow-East China Seas; (3) the northeasterlies to the south are due to the thermal wind between the cool East China Sea and warm Kuroshio Current. The regional atmospheric model successfully simulates the YESA under realistic boundary conditions. In an experiment where the Bohai-Yellow Seas are replaced with flat land, the surface anticyclone is pushed south and forms offshore along the new land-sea boundary, consistent with the thermal high mechanism over the cool sea surface temperature.

収録刊行物

  • 気象集誌. 第2輯

    気象集誌. 第2輯 89 (2), 119-131, 2011

    公益社団法人 日本気象学会

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