COSMIC掩星反演的水汽廓线质量分析

摘要

利用2006-2012年北半球冬季低纬度地区(30°S～30°N)无线电探空站数据及全球大气成分和气候监测再分析数据对1000 hPa～ 200 hPa高度层的气象、电离层与气候星座观测系统全球定位系统掩星反演的比湿廓线进行了精度和可靠性验证.结果表明,水汽对气象、电离层与气候星座观测系统掩星反演影响较大,尤其在中、低对流层及热带地区等水汽含量比较大的地区,且气象、电离层与气候星座观测系统掩星数据在850 hpa以下可能并不太适用于评估其他数据.%The specific humidity profiles derived from the GPS (global positioning system) RO (radio occultation) of the COSMIC (constellation observing system for meteorology,ionosphere,and climate) with those from low latitude (30° S ～ 30°N) radiosonde and MACC (monitoring atmospheric composition and climate) reanalysis during the NH (north hemisphere) winters (December,January,and February) from 2006 to 2012 over the layers from 1000 hPa to 200 hPa were verified.Comparison results demonstrate that the impact of water vapor on the COSMIC GPS RO inversion is very large,especially over the tropical and low troposphere.And the COSMIC GPS RO observations below 850 hpa may not be suitable for the assessment of other observations.