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microphysical processes of a Stratiform Precipitation Event over Eastern China:Analysis Using Micro Rain Radar data

Advances in Atmospheric Sciences 2017年第12期34卷 1472-1482页

作者： Hong WANG Hengchi LEI Jiefan YANG Key Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences Shandong Weather Modification Office

Data collected using the micro rain radar(MRR) situated in Jinan city, eastern China, were used to explore the altitudinal and temporal evolution of rainfall microphysical characteristics, and to analyze the bright band(BB) characteristics and hydrometeor classification. Specifically, a low-intensity and stable stratiform precipitation event that occurred from 0000 to0550 UTC 15 February 2015 and featured a BB was studied. During this event, the rainfall intensity was less than 2 mm h-1 at a height of 300 m, which was above the radar site level, so the errors caused by the vertical air motion could be *** freezing height from the radiosonde matched well with the top of the BB observed by the MRR. It was also found that the number of 0.5–1 mm diameter drops showed no noticeable variation below the BB. The maximum fall velocity and the maximum gradient fall velocity(GFV) of the raindrops appeared at the bottom of the BB. Meanwhile, a method that uses the GFV and reflectivity to identify the altitude and the thickness of the BB was established, with which the MRR can provide a reliable and real-time estimation of the 0?C isotherm. The droplet fall velocity was used to classify the types of snow crystals above the BB. In the first 20 min of the selected precipitation event, graupel prevailed above the BB; and at an altitude of2000 m, graupel also dominated in the first 250 min. After 150 min, the existence of graupel and dendritic crystals with water droplets above the BB was inferred.

关键词： drop size distribution micro rain radar bright band microphysical processes

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Cloud microphysical processes and Atmospheric Water Budget during the 20 July 2021 Extreme Precipitation Event in Zhengzhou,China

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Journal of Meteorological Research 2023年第5期37卷 722-742页

作者： Weixi SHU Danhong FU Hui XIAO Huiling YANG Yue SUN Xueliang GUO Yang ZHAO Jianfang DING Shujing SHEN Key Laboratory of Cloud–Precipitation Physics and Severe Storms(LACS) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 School of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049 School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026 Weather Modification Center of Henan Province Zhengzhou 450003 CMA Cloud–Precipitation Physics and Weather Modification Key Laboratory Weather Modification CentreChina Meteorological Administration(CMA)Beijing 100081

This study investigated the cloud microphysical processes and atmospheric water budget during the extreme precipitation event on 20 July 2021 in Zhengzhou of Henan Province,China,based on observations,reanalysis data,and the results from the high-resolution large-eddy simulation nested in the Weather Research and Forecasting(WRF)model with assimilation of satellite and radar *** results show that the abundant and persistent southeasterly supply of water vapor,induced by Typhoons In-Fa and Cempaka,under a particular synoptic pattern featured with abnormal northwestward displacement of the western Pacific subtropical high,was conducive to warm rain processes through a high vapor condensation rate of cloud water and an efficient collision–coalescence process of cloud water to *** conditions were favorable for the formation and maintenance of the quasi-stationary warmsector heavy *** formation through the collision–coalescence process of cloud water to rainwater accounted for approximately 70%of the total,while the melting of snow and graupel accounted for only approximately 30%,indicating that warm cloud processes played a dominant role in this extreme rainfall ***,enhancement of cold cloud processes promoted by latent heat release also exerted positive effect on rainfall during the period of most intense hourly *** was also found that rainwater advection from outside of Zhengzhou City played an important role in maintaining the extreme precipitation event.

关键词： extreme precipitation event microphysical processes atmospheric water budget large-eddy simulation

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Improving Radar Rainfall Estimation by Accounting for microphysical processes Using a Micro Rain Radar in West Africa

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Atmospheric and Climate Sciences 2021年第4期11卷 658-688页

作者： Ghislain Kouadio Eric-Pascal Zahiri Modeste Kacou Augustin Kadjo Koffi Abé Delfin Ochou Paul Assamoi Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides (LAPA-MF) UFR SSMT Université Félix Houphou&#235 t-Boigny Abidjan C&#244 te d’Ivoire

This study evaluates the improvement of the radar Quantitative Precipitation Estimation (QPE) by involving microphysical processes in the determination of Z-R algorithms. Within the framework of the AMMA campaign, measurements of an X-band radar (Xport), a vertical pointing Micro Rain Radar (MRR) to investigate microphysical processes and a dense network of rain gauges deployed in Northern Benin (West Africa) in 2006 and 2007 were used as support to establish such estimators and evaluate their performance compared to other estimators in the literature. By carefully considering and correcting MRR attenuation and calibration issues, the Z-R estimator developed with the contribution of microphysical processes and non-linear least-squares adjustment proves to be more efficient for quantitative rainfall estimation and produces the best statistic scores than other optimal Z-R algorithms in the literature. We also find that it gives results comparable to some polarimetric algorithms including microphysical information through DSD integrated parameter retrievals.

关键词： Drop Distribution Micro Rain Radar Calibration microphysical processes Z-R Relationships Rainfall Estimation

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microphysical characteristics of precipitating cumulus cloud based on airborne Ka-band cloud radar and droplet measurements

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Atmospheric and Oceanic Science Letters 2022年第2期15卷 65-70页

作者： Lei Wei Mengyu Huang Rong Zhang Yuhuan Lü Tuanjie Hou Hengchi Lei Delong Zhao Wei Zhou Yuan Fu Beijing Weather Modification Center BeijingChina Key Laboratory for Cloud Physics of China Meteorological Administration BeijingChina Wuqing Meteorological Observatory of Tianjin TianjinChina Institute of Atmospheric Physics Chinese Academy of SciencesBeijingChina Zhejiang Meteorological Observatory HangzhouChina Beijing Key Laboratory of Cloud Precipitation and Atmospheric Water ResourcesBeijingChina Beijing Meteorological Bureau BeijingChina

Based on cloud-probe data and airborne Ka-band cloud radar data collected in Baoding on 5 August 2018,the microphysical structural characteristics of cumulus(Cu)cloud at the precipitation stage were *** cloud droplets in the Cu cloud were found to be significantly larger than those in stratiform(STF)*** the Cu cloud,most cloud particles were between 7 and 10μm in diameter,while in the STF cloud the majority of cloud particles grew no larger than 2μ*** sensitivity of cloud properties to aerosols varied with *** cloud droplet effective radius showed a negative relationship with the aerosol number concentration(Na)in the cloud planetary boundary layer(PBL)and upper layer above the ***,the cloud droplet concentration(Nc)varied little with decreased Na in the high liquid water content region above 1500 *** Na values of between 300 and 1853 cm-3 were found in the PBL,and the maximum Na was sampled near the surface in August in the Hebei region,which was lower than that in autumn and *** radar reflectivity corresponded to large FCDP(fast cloud droplet probe)particle concentrations and small aerosol particle concentrations,and vice versa for low radar *** updrafts in the Cu cloud increased the peak radius and Nc,and broadened cloud droplet spectrum;lower air temperature was favorable for particle condensational growth and produced larger droplets.

关键词： Airplane observation microphysical processes Ka-band cloud radar Cumulus

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A numerical study of aerosol effects on Regional precipitation

A numerical study of aerosol effects on Regional precipitati...

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第27届中国气象学会年会大气物理学与大气环境分会场

作者： Yan Yin and Hui Xiao CMA Key Laboratory for Atmospheric Physics and Environment Nanjing University of Information Science & Technology,NO.219 Ningliu Road,Nanjing,210044,China

A rainstorm occurred in Shanxi province on June 13,2007 is simulated using the Weather Research and Forecasting（WRF） mesoscale model coupled with the Morrision’s double-moment bulk microphysical *** tests are conducted and compared for different background conditions to understand the response of cloud microphysical processes and precipitation to changes in concentrations of aerosol *** results show that the total rainfall amount is reduced by about 7.3% in the polluted case as compared with the clean case,but a more intensive rainfall rate at the central region of the rained area and a smaller rainfall area are observed in the former case than in the *** is also found that in the polluted case,while the area of moderate rain becomes smaller,the spread of light and heavy rain becomes *** rain also occurs in the polluted case but is absent in the clean *** and snow crystals are the main sources for rain at the surface,and graupel is mainly formed by coagulations between cloud droplets and snow *** the polluted case considered here,higher concentration of aerosol particles leads to smaller size of ice particles,and consequently more numerous particles can be suspended in the air for longer,delaying precipitation formation at the early stage and intensifying that at the later stage.

关键词： Mesoscale numerical simulation Aerosol WRF microphysical processes

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