摘要
本文利用1979年夏季(6—8月)青藏高原气象科学试验及1979/1980年冬季(12—2月)的高空及地面温压湿场资料,分析了它们的时空统计特征。分析表明:高原地区温压湿场的相关函数分布虽也呈长轴为东西向的椭圆形,但可能因地形影响而不同于我国东半部。其相关程度高度场优于温度场,露点温度场又更次之;冬季优于夏季;对流层高层优于中低层。高原地区温压湿场的持续性较好,特别是夏季对流层高层的温压场。根据上述分析,我们拟合了高原地区温压湿场相关函数随距离变化的解析式,还拟合了用高原中部站表示高原西部站温压湿场,以及用同站前期温压湿场表示实时场的表达式,这些拟合关系可用于高原地区温压湿场的诊断及客观分析。
In this paper the temporary and space statistic characteristics of aerological potential, temperature and dew-point temperature (PTD) fields over Qinghai-Xizang Plateau have been analysed utilizing Summer data (June-August) during the period of Qinghai-Xizang Plateau meteorological scientific experiment in 1979 and Winter data (December-February) in 1979-1980.
The results show: the correlate function distributions of the PTD fields over the Plateau have a ellipse shape with a long axis in east-west direction, but it is something different from that in east part of China due possibly to the influence of the Plateau. The correlate degree in potential fields is better than that in temperature; in dew-point temperature field, even worse. Such correlate degree in Winter is better than in Summer; on 300 hPa, better than on 400 hPa and 500 hPa.
The PTD fields over the Plateau have a quite good persistence, especially the potential and temperature fields on upper troposphere level in Summer.
Based on above features, the analysis formula of the variations of the correlate function in PTD fields over the Plateau with the distance were fitted, also the relation formula of the PTD fields over mid-Plateau stations to that over west-Plateau stations, as well as the antecedent PTD fields to that in real time, were already fitted. These formulas can use in diagnosis and objective analysis in PTD fields over the Plateau.
出处
《高原气象》
CSCD
北大核心
1991年第1期13-25,共13页
Plateau Meteorology
基金
国家"七.五"科技攻关项目75-09-01-07资助课题
关键词
温压
湿场
时空统计
青藏高原
Plateau area
The PTD fields
Correlate function
Correlation between pre- and post-period
Fitting
