Tropical echo-top height for precipitating clouds observed by multiple active instruments aboard satellites
Tropical echo-top height for precipitating clouds observed by multiple active instruments aboard satellites
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卫星上多个活动仪器观测到的降水云的热带回波顶高度
DOI：
10.1016/j.atmosres.2017.08.008
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发表时间：
2018
影响因子：
5.5
通讯作者：
Yunfei Fu
中科院分区：
文献类型：
--
作者：
Yilun Chen;Yunfei Fu
热带降雨测量使命（TRMM）降水雷达（PR）观测到的回波顶高度已被一些研究用作降水云顶高度的近似计算，以模拟辐射强迫或识别过冲对流。然而，由于PR的灵敏度低（~ 17 dBZ），PR回波顶高度低于实际降水云顶高度。本文利用PR、云廓线雷达（CPR）和正交偏振激光雷达（CALIOP）探测的热带降水云顶回波高度，分析了PR回波高度对实际降水云顶高度的低估。结果表明，降水云顶高度的低估存在明显的空间差异，当云光学厚度为10. 0时，降水云顶高度的低估导致了对地球系统辐射强迫的低估，低估1 km时的相对误差约为10%，低估7 km时的相对误差约为20%~ 80%.因此，在使用PR回波顶高度时，应考虑PR对降水云顶高度的低估。
The echo-top height observed by the Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) has been used by some studies as an approximate calculation of the precipitating-cloud-top height to simulate radiative forcing or to identify overshooting convection. However, due to the low sensitivity (~ 17 dBZ) of PR, the PR-echo-top height is lower than the actual precipitating-cloud-top height. Here, the echo-top heights of the tropical precipitating cloud detected by PR, the Cloud Profiling Radar (CPR), and the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) were investigated to evaluate the underestimation of the PR-echo-top height to the actual precipitating-cloud-top height. The results show that there were significant spatial variations in the underestimates of precipitating-cloud-top height by PR. The model simulation showed that these underestimates led to an underestimation of the radiative forcing of the Earth system, the relative error of which was ~ 10% with 1-km underestimation and ~ 20% to 80% with 7-km underestimation when the cloud optical thickness was fixed to 10. Therefore, the underestimates of precipitating-cloud-top height by PR should be taken into consideration when using PR-echo-top height.
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影响因子：
3
作者：
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DOI：
10.1109/igarss.1997.608995
发表时间：
1997-08
期刊：
IGARSS'97. 1997 IEEE International Geoscience and Remote Sensing Symposium Proceedings. Remote Sensing - A Scientific Vision for Sustainable Development
影响因子：
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作者：
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