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cloud top height Retrieval Using Polarizing Remote Sensing Data of POLDER

Atmospheric and Oceanic Science Letters 2009年第2期2卷 73-78页

作者： HE Xianqiang BAI Yan PAN Delu ZHU Qiankun GONG Fang State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography of State Oceanic Administration Hangzhou 310012 China

A retrieval method of cloud top heights using polarizing remote sensing is proposed in this paper. Using the vector radiative transfer model in a coupled atmosphere-ocean system, the factors influencing the upwelling linear polarizing radiance at top-of-atmosphere are analyzed, which show that the upwelling linear polarizing radiance varies remarkably with the cloud top height, but has negligible sensitivity with cloud albedo and aerosol scattering above the cloud layer. Based on this property, a cloud top height retrieval algorithm using polarizing remote sensing was developed. The algorithm has been applied to the polarizing remote sensing data of Polarization and Directionality of the Earth's Reflectances-2 (POLDER-2). The retrieved cloud top height from POLDER-2 compares well with the Moderate Resolution Imaging Spectroradiometer (MODIS) operational product with a bias of 0.83 km and standard deviation of 1.56 km.

关键词： cloud top height polarizing remote sensing Polarization and Directionality of the Earth's Reflectances

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The change of cloud top height over East Asia during 2000–2018

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Advances in Climate Change Research 2020年第2期11卷 110-117页

作者： ZHAO Min ZHANG Hua WANG Hai-Bo ZHOU Xi-Xun ZHU Li AN Qi CHEN Qi State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing100081China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China

In order to know how regional averaged cloud top height(CTH)responded to the past climatic change,the spatial and temporal variations of CTH based on MODIS data(MOD03_08_v6.0)from March 2000 to February 2018 are *** results show that the CTH in East Asia was higher in the southwest and lower in the *** annual mean CTH was found to increase in East Asia at the rate of 0.020 km per year,of which,0.035 km per year over the eastern land and 0.034 km per year over the eastern *** CTH changes statistically correlated with the sea surface temperature changes over the eastern sea(r=0.68),which indicates that the CTH changes may be affected by the underlying *** significant increasing trend of annual mean CTH was found in the latitude zone of 30°–40°***,CTH showed decreasing trends of about−0.030 km per year in the Middle-Lower Yangtze River Basin,Tarim Basin,Turpan Basin and northeastern Sichuan Basin in summer since more low cloud formations benefited to the decrease of *** winter,the decreasing trend of CTH was found over the north of 40°N,whereas the increasing trend was found over the south of 40°N in East Asia.

关键词： cloud top height Variation trend MODISEast Asia Climatic change

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Assessment of FY-4A and Himawari-8 cloud top height Retrieval through Comparison with Ground-Based Millimeter Radar at Sites in Tibet and Beijing

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Advances in Atmospheric Sciences 2021年第8期38卷 1334-1350页

作者： Bo LIU Juan HUO Daren LYU Xin WANG Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

The accuracy of passive satellite cloud top height (CTH) retrieval shows regional dependence. This paper assesses the CTH derived from the FY-4A and Himawari-8 satellites through comparison with those from the ground-based millimeter radar at two sites: Yangbajing, Tibet, China (YBJ), and the Institute of Atmospheric Physics (IAP), Beijing, China. The comparison shows that Himawari-8 missed more CTHs at night than FY-4A, especially at YBJ. It is found that the CTH difference (CTHD;radar CTH minus satellite CTH) for FY-4A and Himawari-8 is 0.06 ± 1.90 km and −0.02 ± 2.40 km at YBJ respectively, and that is 0.93 ± 2.24 km and 0.99 ± 2.37 km at IAP respectively. The discrepancy between the satellites and radar at IAP is larger than that at YBJ. Both satellites show better performance for mid-level and low-level clouds than for high-level clouds at the two sites. The retrievals from FY-4A agree well with those from Himawari-8, with a mean difference of 0.08 km at YBJ and 0.06 km at IAP. It is found that the CTHD decreases as the cloud depth increases at both sites. However, the CTHD has no obvious dependence on cloud layers and fractions. Investigations show that aerosol concentration has little impact on the CTHD. For high and thin clouds, the CTHD increases gradually with the increase of the surface temperature, which might be a key factor causing the regional discrepancy between IAP and YBJ.

关键词： cloud top height Tibet millimeter radar FY-4A Himawari-8

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Verification and Correction of cloud Base and top height Retrievals from Ka–band cloud Radar in Boseong,Korea

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Advances in Atmospheric Sciences 2016年第1期33卷 73-84页

作者： Su-Bin OH Yeon-Hee KIM Ki-Hoon KIM Chun-Ho CHO Eunha LIM Numerical Data Application Division National Institute of Meteorological Sciences KMA Republic of Korea Applied Meteorology Research Division National Institute of Meteorological Sciences KMA Republic of Korea Observation Research Division National Institute of Meteorological Sciences KMA Republic of Korea National Institute of Meteorological Sciences KMA Republic of Korea

In this study,cloud base height（CBH） and cloud top height（CTH） observed by the Ka-band（33.44 GHz） cloud radar at the Boseong National Center for Intensive Observation of Severe Weather during fall 2013（September-November） were verified and *** comparative verification,CBH and CTH were obtained using a ceilometer（CL51） and the Communication,Ocean and Meteorological Satellite（COMS）.During rainfall,the CBH and CTH observed by the cloud radar were lower than observed by the ceilometer and COMS because of signal attenuation due to raindrops,and this difference increased with rainfall *** dry periods,however,the CBH and CTH observed by the cloud radar,ceilometer,and COMS were *** and low-density clouds were observed more effectively by the cloud radar compared with the ceilometer and *** cases of rainfall or missing cloud radar data,the ceilometer and COMS data were proven effective in correcting or compensating the cloud radar *** corrected cloud data were used to classify cloud types,which revealed that low clouds occurred most frequently.

关键词： cloud radar ceilometer satellite retrieval cloud base height cloud top height cloud type

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