Cloud macro-physical characteristics over Nagqu in summer observed by a millimeter-wave radar

1.School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China;2.Key Laboratory of Transportation Meteorology, China Meteorological Administration, Nanjing 210008, China;3.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;4.Fujian Meteorological Information Center, Fujian Meteorological Bureau, Fuzhou 360001, China

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Supported by National Key Research and Development Program of China (2018YFC1505702), National Natural Science Foundation of China (41705008), Beijige Foundation of Jiangsu Institute of Meteorological Sciences (BJG201901), and Scientific Research Foundation of Chengdu University of Information Technology (KYTZ201728).

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    To improve the retrieval accuracy of cloud macro-physical parameters (cloud base height, CBH; cloud top height, CTH; cloud thickness, CTK;and cloud layer number,CLN) over the plateau area using millimeter-wave radar (MMCR) measurements, this study proposed an improved retrieval method. Differences between MMCR- and ceilometer CL31- derived CBHs, and between MMCR- and Himawari-8(HW8)- retrieved CTHs were analyzed. The vertical distribution and diurnal variation of clouds over the Nagqu of Tibetan Plateau in summer observed by these three instruments were also investigated and compared in detail. Results indicate that the presented method can avoid the influences of range sidelobe and cloud layer misclassification compared with the previous method. MMCR-derived CBHs and CTHs are both higher than the counterparts of CL31 and HW8, respectively. Whereas, their vertical distributions and diurnal variations are significantly coherent. The MMCR has a better performance on the CBH observation of multiple-layered clouds than CL31, and similarly can obtain more accuracy measurements of CTHs than HW8. The radar sidelobe echo has apparent influences on the retrievals of cloud macro-physical parameters for both different cloud types.

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ZHENG Jia-Feng, YANG Hua, ZENG Zheng-Mao, LIU Li-Ping, ZOU Ming-Long, ZENG Zhen-Yu. Cloud macro-physical characteristics over Nagqu in summer observed by a millimeter-wave radar[J]. Journal of Infrared and Millimeter Waves,2021,40(4):471~482

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  • Received:June 27,2020
  • Revised:March 31,2021
  • Adopted:November 02,2020
  • Online: July 28,2021
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