摘要
根据华北地区12个探空站近30a(1979-2008年)的各标准等压面月平均气温资料,对该地区高空年、季气温时空演变特征进行了分析。结果表明:华北地区高空年、季平均气温变化均具有非常高的空间一致性,其中冬季的一致性特征最明显;华北地区高空年、季平均气温大致以150-100hPa层为界,以上(平流层下层)和以下(对流层)的气温存在着不同的变化特征:从近地面到200hPa冬(夏)季最低(高),但在年平均气温最低的100-70hPa,气温季节变化位相与对流层相反,50hPa层以上气温的年变化不大;近30a来华北地区对流层中下层的年、季平均气温变化以上升为主,而对流层上层至平流层下层则以下降为主。低层的变暖始于20世纪80年代后期,高层的变冷普遍始于20世纪90年代。
The annual and seasonal characteristics about upper temperature in North China are analyzed on the basis of monthly mean radiosonde records of 12 meteorological stations from 1979 to 2008.The results show that： the spatial characteristic of annual mean upper temperature is high consistent with seasonal＇s in North China,and in winter it is the strongest.Annual and seasonal characteristics of mean upper temperature show that： winter is the lowest and summer is the highest from near-surface to 200 hPa,while it is contrary from 100 hPa to 70 hPa.The annual change up 50 hPa is small.Annual and seasonal mean temperature at middle and lower troposphere is rising primarily,while that at upper troposphere and lower stratosphere is falling primarily.Lower troposphere became warming dated from the late 1980s,and mutations to cooling at upper troposphere and lower stratosphere began from 1990s.
出处
《气象与环境科学》
2010年第4期31-37,共7页
Meteorological and Environmental Sciences
基金
公益性行业(气象)科研专项(GYHY200906014)资助
关键词
华北地区
高空
气温
时空演变特征
North China
upper air
temperature
temporal and spatial characteristic
