塔克拉玛干沙漠腹地2009年大气水汽含量的日变化特征

Diurnal Variation of Atmospheric Water Vapor Content in 2009 over Taklimakan Desert

利用2009年1～10月塔中站地基GPS观测的大气水汽含量数据,分析了其在不同季节的日变化特征。结果表明:塔克拉玛干沙漠腹地全年大气水汽量的日变化特征呈正弦曲线,变化稳定,峰值出现在08时(北京时间,下同)和23时,为13.63mm和13.85mm;谷值出现在01时和14时,为12.91mm和12.28mm。1月大气水汽含量最少,平均值为7.09mm,极小值出现在冬季1月21日13时,为0.95mm;7月水汽含量最大,平均值达到20.01mm,水汽含量极大值出现在8月6日7时,为34.75mm,水汽含量日变化幅度最大月份为10月。

By using the GAMIT soft,the water vapor content of atmosphere was retrieved based on the ground-based GPS data from January to October 2009 in Tazhong station. The diurnal variation curve of PW were obtained by analyzing averaged data of each month. The results are as follows： the diurnal variation of the whole year’s water vapor content in the hinterland of the Taklimakan Desert was obvious and it presented a sine curve. The maximum appears at 08： 00 and 23： 00 with the values of 13. 63 mm and 13. 85 mm. The minimum appears at 01： 00 and 14： 00,12. 91 and 12. 28 mm,respectively. Atmospheric water vapor content is the least in January with the average value of 7. 09 mm,and the minimum value was 0. 95 mm at 13： 00 on January 21 in winter of 2009. And it is the most in July with the value of 20. 01 mm,the maximum value is 34. 75 mm at 07： 00 on August 6 in summer of 2009. The maximum diurnal variation range of water vapor content is in October,and there is not significant fluctuations in February.