Determination of oceanic total precipitable water from the SSM/I
Determination of oceanic total precipitable water from the SSM/I
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DOI：
10.1109/36.58967
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发表时间：
1990-09
影响因子：
8.2
通讯作者：
J. Alishouse;S. A. Snyder;Jennifer Vongsathorn;R. Ferraro
中科院分区：
文献类型：
--
作者：
J. Alishouse;S. A. Snyder;Jennifer Vongsathorn;R. Ferraro
介绍了校准/验证研究的结果，表明特殊传感器微波/成像仪（SSM/I）能够测量海洋上空大气中的总可降水量。在三种不同的算法下，对无线电探空仪和SSM/I进行了比较。结果表明，在海洋总可降水量的检索方面有明显改善的可能性。全局非线性算法对云中液态水含量、降雨和海冰更为敏感。额外的灵敏度是由于从相关数据和检索算法中的平方项中筛选雨和海冰。因此，有良好的筛选程序来识别这些情况将是非常重要的。线性算法在中程过高估计，在大值处低估总可降水量。这种效应的解释可能与选择水汽线中心作为SSM/I水汽通道的工作频率有关。在水蒸气量大的情况下，线中心最有可能表现出饱和效应，而压力和温度的影响也很重要，这取决于大气中水蒸气的分布。>
Results are presented of calibration/validation studies showing the ability of the Special Sensor Microwave/Imager (SSM/I) to measure total precipitable water in the atmosphere over the ocean. Comparisons between radiosondes and the SSM/I are presented for three different algorithms. The results show the possibility of a distinct improvement in the retrieval of total precipitable water over the ocean. The global, nonlinear algorithm is more sensitive to cloud liquid water content, rain, and sea ice. The additional sensitivity is due to the screening of rain and sea ice from the dependent data and the squared term in the retrieval algorithm. Thus, it will be very important to have good screening procedures for identifying these conditions. The linear algorithm overestimates in the mid-range and underestimates at large values of total precipitable water. The explanation for this effect is probably related to the selection of the center of the water vapor line as the operating frequency of the SSM/I water vapor channel. The line center is most likely to exhibit a saturation effect at large water vapor amounts, and pressure and temperature effects can also be important, depending on the distribution of water vapor in the atmosphere. >