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.
Zou X.
中科院分区:
工程技术1区
文献类型:
--
作者:
Yang S.;Zou X.

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我们收集了2009年和2010年的全球COSMIC RO数据,使用NOAA-18高级微波探测单元A(AMSU-A)沿着GPS RO边缘轨迹的测量数据,还使用了CloudSat云廓线雷达(CPR)的数据。AMSU-A液态水路径(LWP)检索在海洋上,然后使用量化的依赖关系的分数微扰活动偏差(N-偏差)的GPS RO配置文件在多云条件下AMSU-A数据点与非零LWP沿着GPS RO肢体轨迹。并置CPR云类型数据集用于选择多云条件下的GPS RO配置文件,并将GPS RO多云配置文件分组为七种不同的云类型。结果表明,正的分数N偏差随云分数沿着COSMIC GPS RO临边轨迹而变化。当高积云、高层云、卷云、积云和深对流云的云分数高达90- 100%时,它达到1 - 2%之间的值。对于雨层云和层积云,大的偏差被发现在任何值的云分数。对于雨层云和层云,即使云分数小于50%,正分数N偏差也可以大于2%。
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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