Abstract
Abstract The comparison between cloud information and rainfall is studied using infrared and radar data from the Tropical Rainfall Measuring Mission. Cloud information from the visible and infrared scanner was compared with rain information from precipitation radar (PR) for rain cases assembled during June 1998 over a frontal zone in east Asia. The authors selected the following four parameters: 1) radiance ratio of 0.6 and 1.6 μm [channel 1/channel 2 (Ch1/Ch2)], 2) brightness temperature difference between 11 and 12 μm (BTD45), 3) brightness temperature difference between 3.8 and 11 μm (BTD34), and 4) brightness temperature (TBB) in channel 4 (Ch4) as the cloud information. The flags of “rain certain,” stratiform rain, brightband existence, and convective rain observed by PR, and integrated rain rate from the rain bottom to rain top were used as the rainfall information. From the comparison between rain–no-rain information by PR and the four cloud parameters, it is found that values of the radiance ratio...
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