美国西南部上空GOES成像仪微下击暴流产物的评估
Assessment of GOES imager microburst product over the southwestern United States
摘要：
一个GOES-West（GOES-11）成像仪微下击暴流算法，采用波段3，波段4，和分裂窗口波段5之间的亮温差异已被开发，以补充探空仪派生的微下击暴流产品。波段3用于指示中高层水分含量和平流，而波段5指示低层水分含量。带3和带5之间的大BTD意味着对流层中部和地面之间的大相对湿度梯度，这是由于深云下层降水的蒸发冷却而产生强对流下沉气流的有利条件。此外，带4和5之间的小BTD表示相对干燥的表层，其中太阳能加热正在进行中。本文提供了进一步评估的GOES成像微下击暴流产品，案例研究证明有效的业务使用的微下击暴流产品，并验证结果为2008年对流季节在亚利桑那州。
英文摘要：
A GOES-West (GOES-11) imager microburst algorithm that employs brightness temperature differences between band 3, band 4, and split window band 5 has been developed to supplement the sounder-derived microburst products. Band 3 is intended to indicate mid to upper-level moisture content and advection while band 5 indicates low-level moisture content. Large BTDs between bands 3 and 5 imply a large relative humidity gradient between the mid-troposphere and the surface, a condition favorable for strong convective downdraft generation due to evaporational cooling of precipitation in the deep sub-cloud layer. In addition, small BTDs between bands 4 and 5 indicate a relatively dry surface layer with solar heating in progress. This paper provides further assessment of the GOES imager microburst product, case studies demonstrating effective operational use of the microburst products, and validation results for the 2008 convective season over Arizona.
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