Guoqing Zhai

Zhejiang University

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Xiaofan Li

Zhejiang University

Jinfang Yin

Chinese Academy of Meteorological Sciences

Donghai Wang

Pennsylvania State University

Huiyan Xu

Nanjing Tech University

Hangfeng Shen

Zhejiang Meteorological Bureau

Xinyong Shen

Nanjing University of Information Science and Technology

Peijun Zhu

Zhejiang University

Zhu Peijun

Shanghai University

Lingli Zhou

Zhejiang Meteorological Bureau

Huanbin Xu

Chinese Academy of Sciences

Cooperative Institutions

Zhejiang University

China Meteorological Administration

Chinese Academy of Sciences

Chinese Academy of Meteorological Sciences

Zhejiang Meteorological Bureau

University of Chinese Academy of Sciences

Nanjing University of Information Science and Technology

Sun Yat-sen University

Institute of Atmospheric Physics

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

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2013年”」”台風の数値シミュレーションにおけるマイクロ物理スキームの比較試験【JST・京大機械翻訳】

Rui Liu Guoqing Zhai Zhu Peijun Li Liangliang

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An Evaluation of the Mellor-Yamada-Janjić Formulation Parameters for the QNSE Scheme in the WRF Model over the Lower Yangtze River Valley

Terrestrial Atmospheric and Oceanic Sciences (2015)

Huiyan Xu Guoqing Zhai Donghai Wang Hangfeng Shen Rui Liu

Accurate description of boundary layer processes is important for numerical simulations, and some model parameters in the boundary layer schemes play an important role in the model simulations.The Quasi-Normal Scale Elimination (QNSE) scheme in the Weather Research and Forecasting (WRF) model version 3.1.1reverts into the Mellor-Yamada-Janjić (MYJ) model under unstable and neutral conditions.The parameters (A 1 , A 2 , B 1 , B 2 , C 1 ) that affect the turbulent mixing in the MYJ formulation are the proportional coefficients of turbulence length scales and the master turbulence length scale.This study examines the model simulations sensitivity to different MYJ parameters.The simulation results show that MYJ parameters play a significant role in rainfall simulations.The analysis results imply that the parameters may affect the rainfall mainly by changing turbulent mixing and coupling with other physical process, such as cumulus convection processes, and then changing heat, momentum, and moisture transfer.The previous parameters used in the original MYJ formulation are not always the best and none of the parameters are always the best.It may be more appropriate that the parameters should be adopted in their plausible physical bounds depending on the planetary boundary layer (PBL) structures characteristics under specific meteorological and geographical circumstances.

Yangtze river

10.3319/tao.2014.11.24.01(a)

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Observational characteristics of cloud vertical profiles over the continent of East Asia from the CloudSat data

Acta Meteorologica Sinica (2013)

Jinfang Yin Donghai Wang Guoqing Zhai Zhien Wang

Drizzle

Liquid water content

Cloud top

10.1007/s13351-013-0104-0

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Decadal trends of global precipitation in the recent 30 years

Atmospheric Science Letters (2014)

Xiaofan Li Guoqing Zhai Shouting Gao Xinyong Shen

Abstract Decadal trends of global precipitation are examined using the Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP), Global Precipitation Climatology Project (GPCP), and National Centers for Environmental Prediction (NCEP)/National Center for Atmospheric Research (NCAR) reanalysis data. The decadal trends of global precipitation average diverge a decreasing trend for the CMAP data, a flat trend for the GPCP data, and an increasing trend for the reanalysis data. The decreasing trend for the CMAP data is associated with the reduction in high precipitation. The flat trend for the GPCP data is related to the offset between the increase in high precipitation and the decrease in low precipitation. The increasing trend for the reanalysis data corresponds to the increase in high precipitation .

Atmospheric research

10.1002/asl2.514

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A Modified Double-Moment Bulk Microphysics Scheme Geared toward the East Asian Monsoon Region

Advances in Atmospheric Sciences (2022)

Jinfang Yin Donghai Wang Guoqing Zhai Hong Wang Huanbin Xu

Cloud physics

10.1007/s00376-022-1402-1

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The Role of Convectively Generated Gravity Waves on Convective Initiation: A Case Study

Monthly Weather Review (2016)

Tao Su Guoqing Zhai

Abstract A case study of a convection initiation (CI) event involving a mesoscale gravity wave is presented. This severe convection event occurred in east China on 5 June 2009. High-frequency automatic weather station (AWS) data, visible satellite data, and Doppler radar data were combined to depict the features of the gravity wave and the development of several convection centers. The gravity wave was manifested by a surface pressure dip and surface wind shift propagating westward away from the early convection. The pressure dip propagated at a speed of >30 m s−1, which is comparable with that in previous observational studies of convectively generated gravity waves. A special focus is on the initiation of a deep convection cell in Anhui Province, which resulted in 25 deaths. Surface observations showed two precursors before CI, including a convergence line and wind shift at the eastern end of the convergence line. High-resolution numerical simulations with the Weather Research and Forecasting (WRF) Model were used to examine the structure of the gravity waves and forecast CI processes. The model reproduced the observed features of the gravity wave and the precursors before CI. Three-dimensional model results showed that CI occurred at the intersection between a convergence line and the gravity wave. The relationships between the wind shift and the pressure drop are consistent with polarization relation in ducted gravity waves. As the updraft of the gravity wave intersected with the convergence line, the low-level updraft strengthened and led to CI. The gravity wave, which had stronger updraft than downdraft, suggested a positive contribution to CI.

Infragravity wave

10.1175/mwr-d-16-0196.1

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Precipitation over Zhejiang, Fujian and Jiangxi of China in June: Climatology

Journal of Earth Science & Climatic Change (2016)

Guoqing Zhai

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Surface rainfall and cloud budgets associated with mei-yu torrential rainfall over eastern China during June 2011

Advances in Atmospheric Sciences (2014)

Guoqing Zhai Xiaofan Li Peijun Zhu Hangfeng Shen Yuanzhi Zhang

10.1007/s00376-014-3256-7

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An attempt to improve Kessler-type parameterization of warm cloud microphysical conversion processes using CloudSat observations

Journal of Meteorological Research (2015)

Jinfang Yin Donghai Wang Guoqing Zhai

Improvements to the Kessler-type parameterization of warm cloud microphysical conversion processes (also called autoconversion) are proposed based on a large number of CloudSat observations between June 2006 and April 2011 over Asian land areas. The emphasis is given to the vertical distribution of liquid water content (LWC), particularly, the threshold values of LWC for autoconversion. The results warrant a new approach to the numerical parameterization of autoconversion in warm clouds. One feature of this new approach is that the autoconversion threshold, which has been treated as a constant in previous parameterization schemes, is diagnosed as a function of altitude by using a relationship between LWC and height (H) derived from CloudSat observations: $$LWC_{dig} = - 500.0\ln \left( {\frac{H} {{9492.2}}} \right)$$ . Under this framework, the threshold LWC decreases with increasing H, allowing autoconversion to occur in clouds with low LWC (approximately 0.3 g m−3) at levels above 5.5 km. Autoconversion rates calculated based on the new parameterization are compared to those calculated based on several commonly used parameterization schemes over a range of LWCs from 0.01 to 1.0 g m−3. The new scheme provides reasonable simulations of autoconversion at various vertical levels.

Parametrization (atmospheric modeling)

10.1007/s13351-015-4091-1

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ANALYSIS OF STRONG WINDS IN THE KEY REGION OF SOUTH INDIAN OCEAN

Marine Forecasts (2006)

Guoqing Zhai

On the vast Southeast Indian Ocean,several“Yuan Wang”vessels track andcontrol the satellites and manned spaceships when they are launched.However,strong windsand choppy ocean in this region are dangerous for the vessels.The work reveals that coldfront,cyclone in the mid-latitude and the strong pressure gradient belt are three key synopticsystems to give rise to the strong wind and ground swell in this region,using incomplethistorical meteorological and hydrological data including surface weather chart and satellitephotograph during 1980~1990 because of the lack of the observation data.These conclusionsare helpful for meteorological service of vessels navigating on the Southeast Indian Ocean.

Swell

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