摘要
根据山东省14个气象站1979—2007年4次/d的大气能见度观测资料、NCEP/NCAR再分析资料、JRA等资料,提出了黄海雾季开始时间的以候为时间尺度的标准,并对影响雾季开始的可能因素进行了分析。结果表明:黄海气候平均雾季开始在第20候,从此候开始,盛行风向、湿度平流、温度平流、大气层结等都有利于海雾的产生;不同年份雾季开始的时间有差别,导致不同年份雾季开始早晚的主要原因是海-气温差、湿度、盛行风;黄东海海温正(负)距平,且东海北部黄海南部海温正(负)距平比黄海北部海温正(负)距平强度更大时,黄海北部雾季开始时间较早(晚)。海-气温差<0℃是海雾季节开始的先决条件,但对海雾季节开始的早晚没有明显的影响。黄海反气旋对大气层结的稳定有一定的贡献,有利于雾的形成和维持。逆温对于雾季的形成和维持有重要作用,但逆温强度与雾季开始的早晚没有直接关系;逆温层的高度可能影响海雾季节的发生,雾季开始偏早年逆温层更接近地面。
By using the atmospheric visibility data of 14 weather stations in Shandong Province from 1979 to 2007, NCEP/NCAR and JRA reanalysis data, the criterion of the beginning season of the Yellow Sea fog on pentad time-scale is put forward. Also some possible factors which could impact on the criterion are analyzed. The results showed that the climatological Yellow Sea fog season starts at the 20th pentad, and from then on, the prevailing wind direction, humidity advection, temperature adveetion, atmospheric stratification, etc. were beneficial to the generation of the sea fog. The beginning season of the fog varied annually because of different sea-air temperature, humidity, prevailing winds. When the sea surface tem- perature （SST） anomalies over the East China Sea and the Yellow Sea were positive （negative）, and the positive （negative） SST anomalies over the southern Yellow Sea and the northern East China Sea were greater than those over the northern Yellow Sea, the fog season of the northern Yellow Sea starts earlier （later）. The negative sea-air temperature difference was the prerequisite for the beginning of the fog sea- son, but do not affect it obviously. Meanwhile the Yellow Sea anticyclone contributed to the stability of atmospheric stratification, which was conducive to the formation and maintenance of the sea fog. Also, the inversion played an important role, but the intensity of inversion had no direct impact on the beginning of fog season. Furthermore, the height of the inversion layer might affect the occurrence of sea fog season, the inversion was more close to the ground in the relatively early fog season years.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第4期11-18,共8页
Periodical of Ocean University of China
基金
国家自然科学基金项目(40975003)
教育部博士点基金项目(20090132110008)
国家高技术研究发展计划项目(2006AA09Z149)
中国气象局公益性行业科研专项经费项目(GYHY(QX)200706031)资助
关键词
海雾
开始日期
黄海
sea fog
start date
the Yellow Sea
