利用全球探空站背景场资料分析不同掩星数据偏差特性

为验证不同掩星数据反演湿温廓线的精度,需量化分析其误差特性。采用分段线性插值法,以时间窗1 h、水平距离100 km为匹配准则,对0.2~30 km各插值高度层温度的平均偏差和标准差进行统计分析,旨在探究不同掩星数据偏差特性。通过采用2018—2019年期间的全球探空站背景场资料完整数据,评估中国区域不同掩星数据偏差。结果表明:与全球探空站背景场资料相比,各类掩星数据绝对负偏差小于0.4 K,整体均值偏差在-0.5～0.5 K间变化,故二者探测精度相当。通过显著性检验分析发现,折射率相对偏差很小,结合统计量F=0.985 7>0.05可知,不同掩星计划探测精度无显著性差异。

Deviation characteristics analysis of different occultation data using IGRA Sounding data

In order to verify the accuracy of different occultation data inversion of the wet temperature profile, it is necessary to quantify the error characteristics. The piecewise linear interpolation method, with time window 1 h and horizontal distance 100 km as the matching criterion was adopted. The average deviation and standard deviation of each interpolated height layer temperature of 0.2~30 km were statistically analyzed to explore the deviation characteristics of different occultation data. By using the complete IGRA (integrated global radiosonde archive) sounding data during 2018-2019, the deviation of different occultation data in China was evaluated. The results show that, for the above kind of occultation data, the temperature deviation is negative, and the overall average deviation is from -0.5 to 0.5 K. The absolute value of occultation data is less than 0.4 K compared with the IGRA data, and the accuracy of occultation data is equivalent to IGRA sounding station data. Through the significant detection analysis, it was found that the relative deviation of refractivity is small, combined with the statistical F=0.985 7>0.05, which shows that the detection accuracy of different masking plans has no obvious difference.