文章摘要
2021年夏季海洋天气评述
Marine weather review in the summer of 2021
投稿时间:2021-10-06  修订日期:2021-11-12
DOI:
中文关键词: 大气环流  大风  海雾  热带气旋  烟花
英文关键词: atmospheric circulation  gale  sea fog  tropical cyclones  In-fa  
基金项目:国家自然科学基金“南海弱台风引发我国强降水的机理研究”(42175007)
作者单位邮编
王皘 国家气象中心 100081
刘达 国家气象中心 100081
董林 国家气象中心 100081
魏娜 中国气象科学院 100081
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中文摘要:
   2021年夏季(6月-8月)大气环流特征为:北半球极涡呈单极型分布,主体位于北冰洋上空偏向西半球,强度较常年偏强。东亚地区以纬向环流为主,副热带高压较常年平均略偏西偏南。6月,北部海域温度较低,黄渤海海雾天气多发。7月,西南季风推进,热带气旋活跃。8月,副高增强西伸,热带气旋活动频次偏少。夏季共有7次海雾过程,其中6月有4次,7月有3次。我国近海出现了9次8级以上大风过程,其中热带气旋大风过程6次,温带气旋入海影响的大风过程3次。浪高在2 m以上的海浪过程有10次,2 m以上大浪的天数共计38 d。我国北部及东部海域升温明显,从北到南的海表面温度梯度减小。西北太平洋和南海有9个台风活动,其中台风“烟花”造成了近海一次范围广、时间长、风力大的大风过程。
英文摘要:
   The main characteristics of the atmospheric circulation in the summer of 2021 (from June to August) are as follows. The polar vortex is characterized by a monopole pattern, which centered over the western hemisphere side, and was stronger than the average. Eastern Asia is controlled by the zonal circulation and slightly extended subtropical high to the west and south. In June, caused by warm moist flow moving over cold sea-surface, sea fog happens over Bohai Sea and Yellow Sea. In July, tropical cyclones are active in the southwestern summer monsoon. In August, the subtropical high strengthened and extended to the west, which is unfavorable for the tropical cyclones. Seven obvious sea fog processes occurred over offshore areas, including 4 in June and 3 in July. There were 9 gale processes above 8-grade over offshore areas of China,including 6 by tropical cyclones, and 3 by extra tropical cyclones. There were 10 rough sea wave processes above two meters, which counted to 38 days. Sea surface temperature increased profoundly in northern and eastern sea, which reduced the meridional SST gradient. 9 tropical cyclones were active over the western North Pacific and the South China Sea. Typhoon In-fa contributed to a large-scope, long-lasting, and intense gale process.
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