Synergetic use of millimeter- and centimeter-wavelength radars for retrievals of cloud and rainfall parameters
Synergetic use of millimeter- and centimeter-wavelength radars for retrievals of cloud and rainfall parameters
复制标题
协同使用毫米波和厘米波雷达反演云和降雨参数
DOI：
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
S. Matrosov
中科院分区：
文献类型：
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作者：
S. Matrosov
抽象。本文介绍了一种同时反演澳大利亚热带西太平洋达尔文站美国能源部气候研究中心垂直柱上空云和降雨参数的遥感方法。这种方法使用了能源部Ka波段雷达的垂直指向测量和附近指向TWP达尔文站点的C波段雷达的扫描测量。降雨反演的约束条件是由一个表面的影响disdrometer的数据。该方法适用于层状降水云系统的液态水凝物层，其中包含降雨和液态水云，和冰水凝物层之间的分离是由雷达亮带提供。利用液态层的C波段绝对反射率和Ka波段垂直反射率梯度反演了平均层降水率和云液态水路径。C波段雷达反射率也被用来估计在融化层以上的区域的冰水路径（IWP）。典型层状降水系统的CLWP和IWP的反演不确定度约为500-800 g m−2（CLWP）和因子2（IWP）。CLWP反演的不确定性随着降雨率的增加而增加，因此对更高降雨率的反演可能不切实际。层平均降雨率反演的预期不确定性约为20%，这在一定程度上是由于可用的disdrometer数据的限制。所建议的方法的适用性说明了两个特征事件观察在TWP达尔文网站在2007年雨季。未来在美国能源部热带气候研究设施部署W波段雷达可以提高CLWP估计精度，并为更广泛的层状降水云事件提供检索。
Abstract. A remote sensing approach for simultaneous retrievals of cloud and rainfall parameters in the vertical column above the US Department of Energy's (DOE) Climate Research Facility at the Tropical Western Pacific (TWP) Darwin site in Australia is described. This approach uses vertically pointing measurements from a DOE Ka-band radar and scanning measurements from a nearby C-band radar pointing toward the TWP Darwin site. Rainfall retrieval constraints are provided by data from a surface impact disdrometer. The approach is applicable to stratiform precipitating cloud systems when a separation between the liquid hydrometeor layer, which contains rainfall and liquid water clouds, and the ice hydrometeor layer is provided by the radar bright band. Absolute C-band reflectivities and Ka-band vertical reflectivity gradients in the liquid layer are used for retrievals of the mean layer rain rate and cloud liquid water path (CLWP). C-band radar reflectivities are also used to estimate ice water path (IWP) in regions above the melting layer. The retrieval uncertainties of CLWP and IWP for typical stratiform precipitation systems are about 500–800 g m−2 (for CLWP) and a factor of 2 (for IWP). The CLWP retrieval uncertainties increase with rain rate, so retrievals for higher rain rates may be impractical. The expected uncertainties of layer mean rain rate retrievals are around 20%, which, in part, is due to constraints available from the disdrometer data. The applicability of the suggested approach is illustrated for two characteristic events observed at the TWP Darwin site during the wet season of 2007. A future deployment of W-band radars at the DOE tropical Climate Research Facilities can improve CLWP estimation accuracies and provide retrievals for a wider range of stratiform precipitating cloud events.
影响因子：
3
作者：
A. Protat;J. Delanoë;D. Bouniol;A. Heymsfield;A. Bansemer;P. Brown
通讯作者：
A. Protat;J. Delanoë;D. Bouniol;A. Heymsfield;A. Bansemer;P. Brown