Retrieving Cloud Ice Water Content Using Millimeter- and Centimeter-Wavelength Radar Polarimetric Observables
Retrieving Cloud Ice Water Content Using Millimeter- and Centimeter-Wavelength Radar Polarimetric Observables
复制标题
使用毫米波和厘米波雷达偏振观测数据反演云冰水含量
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Verlinde
中科院分区：
文献类型：
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作者：
Yinghui Lu;K. Aydin;E. Clothiaux;J. Verlinde
本文用广义多粒子Mie方法计算了大量原始冰晶在毫米和厘米波段的散射特性。毫米和厘米波长雷达观测值也通过采用粒度分布（PSD）来计算，该粒度分布确保了整体性质（例如，冰水含量和总数浓度）落在物理上实际的范围内。雷达反射率Z和冰水含量（IWC）之间的关系被证明是敏感的（从一到两个数量级的变化）所使用的PSD，因此不建议IWC检索。IWC和特定微分相KDP之间的关系较少依赖于PSD。给出了不同雷达仰角和波长下IWC和KDP的简单关系。如果只知道一般的晶体类型（即，基于KDP的IWC反演误差大多在30%以内。如果更详细的冰晶类型是知道的。
AbstractScattering properties of a large collection of pristine ice crystals at millimeter and centimeter wavelengths are calculated using the generalized multiparticle Mie method. Millimeter- and centimeter-wavelength radar observables are also calculated by employing particle size distributions (PSDs) that ensure the bulk properties (e.g., ice water content and total number concentration) fall within physically realistic ranges. The relationships between radar reflectivity Z and ice water content (IWC) are shown to be sensitive (from one to two orders of magnitude in variability) to the PSDs used and are thus not recommended for IWC retrievals. The relationships between IWC and specific differential phase KDP are less dependent on PSDs. Simple relationships between IWC and KDP at different radar elevation angles and wavelengths are given. If only the general crystal type is known (i.e., planar vs columnar), IWC retrieval errors based on KDP mostly fall within 30%. If more detailed ice crystal type is kn...