RPG-HATPRO微波辐射计反演的温度和湿度数据适用性分析

Applicability analysis of air temperature and humidity data retrieved from a RPG-HATPRO microwave radiometer

以太原地区常规探空观测资料为参考,选取2015年2月13日至2016年6月21日地面、925 hPa、850 hPa、700 hPa、500 hPa、400 hPa、300 hPa的00时次和12时次温度与露点温度的配对数据,采用统计学方法对比分析同址德国RPG-HATPRO型微波辐射计反演的温度和湿度数据。结果表明:不同等压层微波辐射计反演的温度与探空观测的温度数据存在一定的偏差,微波辐射计反演的温度数据相对探空观测的温度数据系统性偏小。微波辐射计反演的和探空观测的温度数据同步性较强,二者相关系数为0.89以上,二者露点温度数据的相关系数为0.60以上。综合分析可知,降水对微波辐射计反演的温度和湿度数据影响均较大。为了验证不同等压层微波辐射计反演温度数据的偏差准确性,在对比分析的基础上建立微波辐射反演温度的订正模型,采用滑动均值订正法和配对样本T检验验证法对微波辐射计反演的温度进行订正,订正偏差为0.5℃以内。

The data of air temperature and humidity retrieved from a German RPG-HATPRO microwave radiometer were statistically analyzed in comparison with the routine sounding data at the same observational site in Taiyuan for air temperature and dew point temperature at surface,925hPa,850hPa,700hPa,500hPa,400hPa,and300hPa at00:00and12:00from February13,2015to June21,2016.The results show that certain deviation exists between the temperature retrieved using the microwave radiometer and that observed by sounding at different isobaric levels.The temperature data from microwave radiometer are systematically smaller than the sounding temperature.The correlation coefficient value between the two kinds of temperature data is larger than0.89,which means a high synchronism in the temperature data,and the correlation coefficient in dew point temperature is larger than0.60.Precipitation has a great influence on the temperature and humidity data retrieved from the microwave radiometer.A correction model for the temperature data measured from the microwave radiometer is established to verify the accuracy of the temperature data at different isobaric levels.The temperature data are corrected using a moving average method and a T-test method for paired samples,and the bias correction is smaller than0.5°C.