摘要
使用 NCEP/NCAR 1979～ 1995年 17年全球旬平均网格点资料及北疆 8个站 1979～ 1995年 17年冬季（ 12～ 2月）降水资料，选取了 3个降水偏多年， 4个降水偏少年，分别计算了偏多、偏少年对应北半球范围内 500、 100hPa冬季平均高度场及距平场，分别计算了对应新疆范围内极锋锋区的强度和位置。指出北疆冬季降水偏多、偏少与欧亚中高纬环流特征有关，与新疆上空中纬度极锋锋区有关。
By using the ten－ days average reanalysis data on global from NCEP/NCAR and precipitation data at 8 stations of Northern Xinjiang in winter from 1979 to 1995,3 years with precipitation more than the mean and 4 years with precipitation less than the mean are selected.Then,500hPa and 100hPa fields of height and its departure in winter over Northern Hemisphere,also the intensities and positions of polar frontal zone over Xinjiang are calculated corresponding to the two kinds of abnormal years.The results show that the abnormal precipitation in Northern Xinjiang in winter is related to the features of circulation in middle－ high latitude over Eurasia and the polar frontal zone in middle latitude over Xinjiang.
出处
《新疆气象》
2001年第2期8-10,共3页
Bimonthly of Xinjiang Meteorology
关键词
冬季
降水异常
环流特征
极锋锋区
新疆
降水资料
precipitation in winter
anormaly
circulation features
polar frontal zone
