黄海大风日数长期变化特征研究

Long-term Change Characteristics of Gale Days on the Yellow Sea

利用1979—2009年的CFSR再分析风场资料,分风向、分月份对黄海6级以上大风变化特征进行了统计分析。结果表明:黄海大风日数呈趋势性减少特征,黄海北部海区和东南部海区大风日数最多。NNW风向大风日数最多(6.8 d),而南风大风日数最少(0.8 d)。大风日数最多的月份是12月(7.8 d),而最少的月份是6月(2.0 d)。各风向大风日数异常振荡的周期一般为2.5～3.0年。黄海大风冬季3个月基本以偏西北风为主,春季偏南大风的比例逐月增加。夏季3个月主要以偏南大风为主,秋季3个月以西南大风日数最多。全年中8级以上极端大风日数最多的月份是8月,与夏季极端大风相联系的天气过程主要为热带气旋。

Based on CFSR reanalysis dataset from 1979 to 2009,this article did a comprehensive statistic analysis to the variable characteristics of force 6＋ wind of different direction in different month in the Yellow Sea.The results showed that average gale day of the Yellow Sea area had a decreasing trend, in spatial distribution, north and southeast sea area had the most gale day.Furthermore, NNW was the most （6.8 days ）, and south wind was the least （0.8 days ）.Specific to each month, December had the most gale day （7.8 days ） ;June had the fewest （2.0 days ）.In winter, Yellow Sea Area had the most northwesters ;while in spring, southerlies increaseed month by month.Summer had the most southerlies ,among which ,mainly southeaster and southwester,and August had the most southwester.Study to variation characteristics of force 8＋ gale showed that August had the most extreme wind day of the year, tropical cyclone had a main relation to this.