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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Intercomparison of deep convective cloud fractions from passive infrared and microwave radiance measurements
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Intercomparison of deep convective cloud fractions from passive infrared and microwave radiance measurements

机译：通过被动红外和微波辐射测量比较深对流云部分

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The common method to detect deep convective clouds is from satellite infrared (IR) measurements, which is based on thresholds of cloud-top temperatures. However, thick cirrus clouds with high cloud tops are difficult to screen out using IR methods, resulting in an overestimation of deep convective cloud fractions. Two aircraft cases with simultaneous Millimeter-wave Imaging Radiometer, Multispectral Atmospheric Mapping Sensor, and ER-2 Doppler radar measurements during the Convection and Moisture Experiment 3 in August 1998 are analyzed to investigate the influence of high thick cirrus clouds on two previously developed IR methods. In contrast, a microwave method based on the brightness temperature differences between the three water vapor channels around 183.3 GHz of the Advanced Microwave Sounding Unit-B (AMSU-B) (183.3/spl plusmn/1,183.3/spl plusmn/3, and 183.3/spl plusmn/7 GHz) can screen out high thick cirrus clouds efficiently. The tropical deep convective cloud fractions (30/spl deg/S-30/spl deg/N) estimated by the IR methods and the AMSU-B method are compared. Although their geographical distributions are in well agreement with each other, the total fractions detected by the IR methods are about 2-3.5 times greater than that detected by the AMSU-B method. Moreover, the overestimation of deep convective cloud fractions by the IR method (11-/spl mu/m brightness temperature less than 215 K) can result in a displacement in the detected location of the deep convective clouds. The average thick cirrus clouds cover 2.5 times the area of the deep convective clouds that generates them.
机译：检测深层对流云的常用方法是通过卫星红外（IR）测量，该测量基于云顶温度的阈值。但是，具有高云顶的厚卷云很难使用IR方法进行筛选，从而导致高估了深对流云分数。在1998年8月的对流和水分实验3中，分析了两个同时具有毫米波成像辐射计，多光谱大气测绘传感器和ER-2多普勒雷达测量的航空器箱，以研究高厚卷云对两种先前开发的红外方法的影响。相比之下，微波方法基于高级微波探测单元B（AMSU-B）在183.3 GHz附近的三个水蒸气通道之间的亮温差（183.3 / spl plusmn / 1,183.3 / spl plusmn / 3和183.3 / spl plusmn / 7 GHz）可以有效地筛选出高厚的卷云。比较了通过IR方法和AMSU-B方法估算的热带深层对流云分数（30 / spl deg / S-30 / spl deg / N）。尽管它们的地理分布彼此非常吻合，但是通过IR方法检测的总馏分比通过AMSU-B方法检测的总馏分高约2-3.5倍。此外，通过IR方法（11- / splμm/ m的亮度温度小于215 K）高估了深对流云分数可能会导致深对流云的检测位置发生位移。平均厚的卷云覆盖了产生它们的深对流云面积的2.5倍。

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