利用COSMIC掩星资料分析青藏高原地区对流层顶季节变化特征
投稿时间:2018-03-15  修订日期:2018-09-04  点此下载全文
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作者单位E-mail
余小嘉 南京信息工程大学 大气科学学院 yuxiaojia@nuist.edu.cn 
杨胜朋 南京信息工程大学 大气科学学院 yangshengp@nuist.edu.cn 
蒋熹 南京信息工程大学 大气科学学院  
张明 国家环境保护大气物理模拟与污染控制重点实验室国电环境保护研究院  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)、公益性行业(气象)科研专项、江苏省“青蓝工程”项目
中文摘要:GPS掩星在对流层顶精度很高,适用于对流层顶特性的研究。根据WMO(1957)对流层高度的判别方法,利用2007至2013年COSMIC掩星资料,分析了青藏高原地区对流层顶季节变化特征,并用线电探空资料对结果进行了检验。结果表明,COSMIC掩星资料和线电探空资料判定的对流层高度具有很高的线性相关关系,相关系数高达0.976,平均值偏差为0.448 km,均方根误差为0.672 km。受热力学因素影响,青藏高原对流层顶在夏季最高,在冬季和春季最低。从冬季到夏季,对流层顶断裂带的位置也逐渐北抬。春季、冬季和秋季,受赤道热源影响,从低纬到高纬,在对流层中低层中等熵面逐渐抬升、水汽混合比逐渐下降。夏季,在热源引起的深对流和季风产生的水平输送作用下,青藏高原上空出现了水汽的高值区。
中文关键词:COSMIC掩星  对流层顶高度  青藏高原
 
Seasonal Variation of the Tropopause height over Tibetan Plateau Derived from COSMIC Radio Occultation data
Abstract:Global Positioning System Radio Occultation (GPS RO) measurements is particularly suitable for the study of tropopause characteristics due to the high measurement accuracy at the tropopause height. COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate) occultation data from 2007 to 2013 were used to calculate the tropopause heights over the Tibetan Plateau according to the WMO (1957) tropospheric height discriminant method, and radiosonde data were used to verify the results. The height characteristics of the troposphere over the Tibetan Plateau, and the distribution of water vapor in the troposphere were analyzed. The results showed that there was a high linear correlation between the tropopause heights detected by COSMIC occultation data and radiosonde data over the Tibetan Plateau. The correlation coefficient was as high as 0.976, the average deviation was 0.448 km, and the root mean square error was 0.672 km. Influenced by thermodynamic factors, the tropopause over Tibet Plateau is highest in summer and lowest in winter and spring. From winter to summer, the position of the tropopause break area gradually moves northward. In spring, winter and autumn, affected by the equatorial heat source, the entropy surface from low to high latitude rises, with the water vapor mixing ratio decreasing gradually in the middle and lower troposphere. In summer, under the effect of the deep convection caused by the heat source and the horizontal transport caused by the monsoon, a high value area of water vapor appears above the Qinghai-Tibet Plateau.
keywords:COSMIC Radio Occultation, tropopause height
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