Dependence of positive refractivity bias of GPS RO cloudy profiles on cloud fraction along GPS RO limb tracks
Dependence of positive refractivity bias of GPS RO cloudy profiles on cloud fraction along GPS RO limb tracks
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GPS RO 多云轮廓的正折射率偏差对沿 GPS RO 临轨轨迹的云分数的依赖性
DOI:
10.1007/s10291-016-0541-1
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发表时间:
2017-04
期刊:
影响因子:
4.9
通讯作者:
Zou X.
中科院分区:
文献类型:
--
作者:
Yang S.;Zou X.
We collected global COSMIC RO data from 2009 and 2010 using measurements from the NOAA-18 Advanced Microwave Sounding Unit-A (AMSU-A) along GPS RO limb tracks and also using data from the CloudSat Cloud Profiling Radar (CPR). The collocated AMSU-A liquid water path (LWP) retrieval over the ocean is then used to quantify the dependence of fractional refractivity bias (N-bias) of GPS RO profiles in cloudy conditions on AMSU-A data points with nonzero LWP along GPS RO limb tracks. The collocated CPR cloud type dataset is used for selecting GPS RO profiles in cloudy conditions and for grouping GPS RO cloudy profiles into seven different cloud types. It is shown that the positive fractionalN-bias varies with cloud fraction along the COSMIC GPS RO limb tracks. It reaches a value between 1 and 2 % when cloud fraction is as high as 90–100 % for altocumulus, altostratus, cirrus, cumulus, and deep convection clouds. For nimbostratus and stratocumulus clouds, large biases are found at any value of cloud fraction. The positive fractionalN-bias can be more than 2 % even if cloud fraction is less than about 50 % for nimbostratus and stratus clouds.
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