Evaluation of Ice Water Content Retrievals from Cloud Radar Reflectivity and Temperature Using a Large Airborne In Situ Microphysical Database
Evaluation of Ice Water Content Retrievals from Cloud Radar Reflectivity and Temperature Using a Large Airborne In Situ Microphysical Database
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DOI：
10.1175/jam2488.1
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发表时间：
2007-05
影响因子：
3
通讯作者：
A. Protat;J. Delanoë;D. Bouniol;A. Heymsfield;A. Bansemer;P. Brown
中科院分区：
文献类型：
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作者：
A. Protat;J. Delanoë;D. Bouniol;A. Heymsfield;A. Bansemer;P. Brown
摘要本文的目的是评估拟议的冰水含量（IWC）-雷达反射率Z和IWC-Z-温度T关系的性能，以便在即将到来的CloudSat星载雷达的框架内，在空间或地面站点从雷达准确检索IWC，以及欧洲CloudNET和美国大气辐射测量计划项目。为此，一个大型的机载原位微物理数据库被用来执行详细的误差分析的IWC-Z和IWC-Z-T方法。该误差分析不包括这些方法中假设的质量-尺寸关系所产生的误差，尽管该误差的预期大小在本文中是有界的。首先，这项研究表明，在全球范围内使用单一的IWC-Z关系来估计IWC在−15 dBZ以下是可行的，但对于更大的反射率（因此也是更大的IWC），必须对中纬度和热带冰云使用不同的关系。...
Abstract The objective of this paper is to assess the performances of the proposed ice water content (IWC)–radar reflectivity Z and IWC–Z–temperature T relationships for accurate retrievals of IWC from radar in space or at ground-based sites, in the framework of the forthcoming CloudSat spaceborne radar, and of the European CloudNET and U.S. Atmospheric Radiation Measurement Program projects. For this purpose, a large airborne in situ microphysical database is used to perform a detailed error analysis of the IWC–Z and IWC–Z–T methods. This error analysis does not include the error resulting from the mass–dimension relationship assumed in these methods, although the expected magnitude of this error is bounded in the paper. First, this study reveals that the use of a single IWC–Z relationship to estimate IWC at global scale would be feasible up to −15 dBZ, but for larger reflectivities (and therefore larger IWCs) different sets of relationships would have to be used for midlatitude and tropical ice clouds. ...