摘要
基于昆明站（25.6°N,103.8°E）ST雷达近一年的风场观测结果给出了5～22.1km高度范围内风场的季节变化特征及利用镜面反射方法和雷达回波功率数据估测了对流层顶的高度.结果显示：17 km是平均风特征发生变化的高度,即17 km以下夏季为西向风和南向风,其他季节为东向风和北向风,而17 km以上纬向风几乎全年盛行东向风,经向风变化则更为复杂,且二者与HWM07模式结果的变化特征不完全一致.估测得到的昆明上空对流层顶高度范围是14～17.6 km,由此推测对流层中强烈的对流活动很可能是形成平均风场该特征的主要原因.
The main propose in this paper is to give the seasonal variation of mean wind for the first time at the height of 5～22.1 km based on Kunming （25.6°N, 103.8°E） ST radar and estimate the tropopause height using the mirror reflection method and echo power data. The results show that the main feature in the mean circulation always chan- ges at the height of 17 kin, which is that the westward and southward flow plays an im- portant role in summer, eastward and northward flow in other seasons below 17 kin, but eastward flow dominates almost all the year and direction becomes complex in me- ridional above 17 km, although there has some differences from the simulation of HWM07 model. The tropopause height estimated ranging from 14 km to 17.6 km over Kunming is in good agreement with the variation characteristics of tropopause in low latitude area. So the strong convection in troposphere may be the important reason to forming this feature of mean wind.
出处
《电波科学学报》
EI
CSCD
北大核心
2014年第6期1165-1170,共6页
Chinese Journal of Radio Science
基金
国家自然科学基金(No.41104102)
