文章摘要
2021年春季海洋天气评述
Spring 2021 marine weather review
投稿时间:2021-07-02  修订日期:2021-08-26
DOI:
中文关键词: 大风  海雾  冷空气  浪高  海温
英文关键词: gale  sea fog  cold air  wave height  sea surface temperature
基金项目:
作者单位邮编
刘达 国家气象中心 100081
王慧 国家气象中心 100081
黄彬 国家气象中心 100081
曹越男 国家气象中心 100081
陈博宇 国家气象中心 
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中文摘要:
   2021年春季(3月-5月)的大气环流特征为:北半球极涡为偶极型分布,极涡较常年平均值偏强,中高纬度西风带呈现4波型。3月,南下冷空气活动偏弱,月内海雾过程频发。4月,北部海域受高压影响,低层形势场稳定,冷空气活动减弱。5月,我国近海受温带气旋影响出现大风天气。春季我国近海出现了5次8级以上大风过程,其中冷空气大风过程2次,冷空气和温带气旋共同影响的大风过程1次,温带气旋影响的大风过程2次。春季共有8次海雾过程,3 月3 次,4 月2次,5 月3 次。近海浪高在2 m 以上的海浪过程有8次,大浪日数偏少。西北太平洋和南海共生成2个台风。我国近海的海面温度整体呈上升趋势,东部和南部海域升温明显,南部和北部海域海表温度梯度增加。
英文摘要:
   The main characteristics of the general atmospheric circulation in the spring of 2021 (from March to May) are as follows. The polar vortex was characterized by a dipole pattern in the northern hemisphere and was stronger than the average. The westerlies in the middle and high latitudes are 4-wave pattern. In March, the intensity of cold air was weak which caused sea fog occurred frequently during the month. In April, North China sea was affected by surface high pressure system, the circulation was stable, thus the activity of cold air was weak. In May, the surface wind was affected by extratropical cyclones. There were 5 gale processes above 8-grade over offshore areas of China, including 2 produced by cold air, 1 jointly induced by cold air and extratropical cyclones, and 2 generated by extratropical cyclones. Eight obvious sea fog processes occurred over offshore areas, including 3 in March, 2 in April, and 3 in May. There were 8 rough sea wave processes above two meters, and the lasting days of these processes were less than average. Two tropical cyclones was active over the western North Pacific and the South China Sea.The sea surface temperature over the offshore areas was increasing during spring, the increasing rates in eastern and southern seas were more significant which enhanced the gradient of sea surface temperature between the North and South China sea.
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