北纬30°N中间层和低热层大气平均风中频雷达观测  

Observations of the Mesospheric and Lower Thermospheric Mean Winds at 30°N With MF radars

作　　者：张冬娅[1] 胡雄[2] 张训械[1] 吴小成[1] K.Igarashi 

机构地区：[1]中国科学院武汉物理与数学研究所,武汉430071 [2]中国科学院空间科学与应用研究中心 [3]日本国家信息和通信技术研究所

出　　处：《空间科学学报》2005年第4期267-272,共6页Chinese Journal of Space Science

基　　金：国家自然科学基金项目资助(40204011)

摘　　要：利用武汉(30.5°N,114.4°W)中频雷达在2001年1月1日至3月18日、2002年2月5日至3月18日、2002年10月18日至12月31日期间,日本Yamagawa(31.2°N,130.6°W)中频雷达在1997年1月1日至10月17日期间的数据,分析北纬30°N地区上空60-98km高度的中间层、低热层大气平均风的变化规律,结果表明平均纬向风和经向风都具有明显的季节变化.平均纬向风在冬季基本为西风,随高度增加,西风减弱,甚至在上部会出现微弱的东风;夏季中间层表现为强烈的东风,低热层则为西风,风向转换高度在80km附近;春季和秋季为转换季节,在春季出现舌状东风结构.80km附近的平均经向风场在冬季以南风为主,在夏季则以北风为主.不同年份的平均风场存在年际变化性,但其气候变化特点非常相似.中频雷达观测结果与HWM93模式结果的气候变化特点符合很好,与其他纬度的平均纬向风气候变化特点基本类似.Winds data of Wuhan (30.5°N, 114.4°W) MF radar available during 2001-01-01-03-18, 2002-02-05-03-18, and 2002-10-18-12-31, Yamagawa (31.2°N, 130.6°W) MF radar of Japan available during 1997-01-01-10-17 were used to analyze features of the mesospheric and lower ther-mospheric mean winds within 60-98km altitude ranges at near 30°N. It is shown that there are obviously seasonal variations in mean zonal winds and mean meridional winds. Westerly winds prevail in winter mean zonal winds, and decrease versus increasing heights, and even reverse near the top sometimes. During summer, Easterly winds prevail in the mesosphere but westerly winds prevail in the lower thermosphere. The summer zonal wind reversed height is about 80km. The spring and autumn are the transition time between summer structures and winter structures. An easterly winds tongue shows in spring. In the mesopause regions near 80km the mean meridional winds blow northwards during winter time, but southwards during summer time. Mean winds also show inter-annual variability. The above climate features of mean winds agree very well with the HWM93 model.

关 键 词：中频雷达 大气平均风场 中层顶 季节变化 

分 类 号：P412.25[天文地球—大气科学及气象学]