The response of 36- and 89-GHz microwave channels to convective snow clouds over ocean : Observation and modeling
The response of 36- and 89-GHz microwave channels to convective snow clouds over ocean : Observation and modeling
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36 GHz 和 89 GHz 微波通道对海洋上空对流雪云的响应：观测和建模
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Guosheng Liu
中科院分区：
文献类型：
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作者：
M. Katsumata;H. Uyeda;K. Iwanami;Guosheng Liu
本文介绍了在微波频率下对雪云辐射特性的观测和模拟的首次研究。利用机载微波辐射计和x波段多普勒雷达同时观测海洋上空的雪云。结果表明，36 ghz和89 ghz微波通道的亮度温度对降水粒子水平变化和多普勒雷达观测的云动力结构有较好的响应，反映了对流单体的发展阶段。为了定量验证，使用辐射传输模型进行了液态水和雪水量的物理检索。反演的雪水量与雷达反射率转换后的雪水量吻合较好。在反演方法中，模型模拟的亮度温度在每通道3 K以内与观测值基本吻合。检索参数的模糊性…
Abstract The first study in both observing and modeling radiative properties of snow clouds in the microwave frequencies is described in this paper. Snow clouds over ocean were observed simultaneously using an airborne microwave radiometer and an X-band Doppler radar. Results show that brightness temperatures at 36- and 89-GHz microwave channels responded well to the horizontal variations of precipitation particles and to the cloud dynamic structures determined by the Doppler radar, which reflect the development stages of convective cells. For the quantitative validation, physical retrievals of liquid water and snow water amounts were performed using a radiative transfer model. The retrieved snow water amount agrees well with the observed snow water amount that was converted from observed radar reflectivity. In the retrieval method, the model-simulated brightness temperatures were able to match the observed values within 3 K per channel for the most part. The ambiguities of the retrieved parameters that d...