Systematic and random errors between collocated satellite ice water path observations
Systematic and random errors between collocated satellite ice water path observations
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DOI：
10.1029/2012jd018381
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
S. Eliasson;Gerrit Holl;Stefan Buehler;Thomas Kuhn;M. Stengel;Flavio Iturbide-Sanchez;M. Johnston
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文献类型：
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作者：
S. Eliasson;Gerrit Holl;Stefan Buehler;Thomas Kuhn;M. Stengel;Flavio Iturbide-Sanchez;M. Johnston
在观测数据集中，冰-水路径（IWP）仍然存在很大的差异，这主要是因为传感器观测到的冰颗粒大小分布的不同部分。对2007年热带地区（±30°纬度）卫星观测反演的IWP进行了详细比较。无线电探测和测距（雷达）/光探测和测距（激光雷达）（DARDAR） IWP数据集，基于雷达/激光雷达的组合测量，被用作参考，因为它可以提供总的纵队IWP的最佳估计。对于每个数据集，可用的IWP动态范围是从这种比较中推断出来的。在中分辨率成像光谱辐射计（MODIS）、先进的非常高分辨率基于辐射计的气候监测卫星应用设施（CMSAF）和Pathfinder Atmospheres - Extended （PATMOS - x）数据集中，基于太阳反射率测量的IWP检索结果与DARDAR在较大的IWP范围内（~ 20-7000 g m - 2）相关。并置数据集的随机误差接近对数正态分布，MODIS和DARDAR的组合随机误差小于1 / 2，这也为单独MODIS设置了上限。同样，确定所有考虑的数据集的随机误差的上限。基于被动微波测量、微波表面和降水产品系统（MSPPS）、微波综合检索系统（MiRS）和仅配置微波（CMO）的数据集在IWP值大于约700 g m‐2时与DARDAR的相关性很大。在此范围内，这些数据集与DARDAR之间的综合不确定性略低于MODIS - DARDAR，但系统偏差接近一个数量级。
There remains large disagreement between ice‐water path (IWP) in observational data sets, largely because the sensors observe different parts of the ice particle size distribution. A detailed comparison of retrieved IWP from satellite observations in the Tropics (±30° latitude) in 2007 was made using collocated measurements. The radio detection and ranging(radar)/light detection and ranging (lidar) (DARDAR) IWP data set, based on combined radar/lidar measurements, is used as a reference because it provides arguably the best estimate of the total column IWP. For each data set, usable IWP dynamic ranges are inferred from this comparison. IWP retrievals based on solar reflectance measurements, in the moderate resolution imaging spectroradiometer (MODIS), advanced very high resolution radiometer–based Climate Monitoring Satellite Applications Facility (CMSAF), and Pathfinder Atmospheres‐Extended (PATMOS‐x) datasets, were found to be correlated with DARDAR over a large IWP range (~20–7000 g m‐2). The random errors of the collocated data sets have a close to lognormal distribution, and the combined random error of MODIS and DARDAR is less than a factor of 2, which also sets the upper limit for MODIS alone. In the same way, the upper limit for the random error of all considered data sets is determined. Data sets based on passive microwave measurements, microwave surface and precipitation products system (MSPPS), microwave integrated retrieval system (MiRS), and collocated microwave only (CMO), are largely correlated with DARDAR for IWP values larger than approximately 700 g m‐2. The combined uncertainty between these data sets and DARDAR in this range is slightly less MODIS‐DARDAR, but the systematic bias is nearly an order of magnitude.