Development and Application of a New Convective Entrainment Rate Parameterization for Improving Precipitation Simulation Over the Tibetan Plateau and Its Surrounding Areas
Abstract The Tibetan Plateau (TP) significantly impacts the global climate. TP's unique geographical conditions make it one of the areas with the largest precipitation biases in numerical models. The overestimation and distribution biases of precipitation in models are closely related to the pa...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Geophysical Union (AGU)
2025-01-01
|
| Series: | Journal of Advances in Modeling Earth Systems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2024MS004543 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832583479983865856 |
|---|---|
| author | Junjun Li Chunsong Lu Jinghua Chen Jian Li Jing Yang Xiaoqi Xu Lei Zhu Xin He Shiying Wu |
| author_facet | Junjun Li Chunsong Lu Jinghua Chen Jian Li Jing Yang Xiaoqi Xu Lei Zhu Xin He Shiying Wu |
| author_sort | Junjun Li |
| collection | DOAJ |
| description | Abstract The Tibetan Plateau (TP) significantly impacts the global climate. TP's unique geographical conditions make it one of the areas with the largest precipitation biases in numerical models. The overestimation and distribution biases of precipitation in models are closely related to the parameterization of convection processes over the TP. In light of this, a new deep convective entrainment rate parameterization suitable for the region is developed based on convection observational data and is applied to the Grell‐Freitas Ensemble Scheme of the Weather Research and Forecasting Model. The new scheme significantly reduces the overestimation of simulated precipitation over the TP, decreasing the overestimation from 29.4% in the default scheme to 11.8%. The physical mechanism behind the improved simulation results is as follows: first, the entrainment rate of convection in the new scheme is closer to the observed results. Second, in terms of cloud macrophysics, the new scheme increases the convective entrainment rate, reduces the cloud top height and depth of convective clouds, and decreases the number of grids with updrafts in the vertical layers and grids with convective precipitation on the surface. Third, in terms of cloud microphysics, the increased entrainment rate reduces the cloud water content and weakens the intensity of convective precipitation. All of these mechanisms ultimately reduce the accumulated convective precipitation amount, providing an optimized modeling tool for weather and climate research over TP, which also aids in better assessing the water cycle and water resource reserves of the “Asian Water Tower.” |
| format | Article |
| id | doaj-art-76279905a9c843569487dee99853d192 |
| institution | Kabale University |
| issn | 1942-2466 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Journal of Advances in Modeling Earth Systems |
| spelling | doaj-art-76279905a9c843569487dee99853d1922025-01-28T13:21:09ZengAmerican Geophysical Union (AGU)Journal of Advances in Modeling Earth Systems1942-24662025-01-01171n/an/a10.1029/2024MS004543Development and Application of a New Convective Entrainment Rate Parameterization for Improving Precipitation Simulation Over the Tibetan Plateau and Its Surrounding AreasJunjun Li0Chunsong Lu1Jinghua Chen2Jian Li3Jing Yang4Xiaoqi Xu5Lei Zhu6Xin He7Shiying Wu8China Meteorological Administration Aerosol‐Cloud and Precipitation Key Laboratory and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC‐FEMD) Nanjing University of Information Science and Technology Nanjing ChinaChina Meteorological Administration Aerosol‐Cloud and Precipitation Key Laboratory and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC‐FEMD) Nanjing University of Information Science and Technology Nanjing ChinaChina Meteorological Administration Aerosol‐Cloud and Precipitation Key Laboratory and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC‐FEMD) Nanjing University of Information Science and Technology Nanjing ChinaState Key Laboratory of Severe Weather Chinese Academy of Meteorology Sciences Beijing ChinaChina Meteorological Administration Aerosol‐Cloud and Precipitation Key Laboratory and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC‐FEMD) Nanjing University of Information Science and Technology Nanjing ChinaNanjing Joint Institute for Atmospheric Sciences Nanjing ChinaChina Meteorological Administration Aerosol‐Cloud and Precipitation Key Laboratory and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC‐FEMD) Nanjing University of Information Science and Technology Nanjing ChinaChina Meteorological Administration Aerosol‐Cloud and Precipitation Key Laboratory and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC‐FEMD) Nanjing University of Information Science and Technology Nanjing ChinaHuaFeng Research Lab for Weather Science and Applications Nanjing University of Information Science and Technology Nanjing ChinaAbstract The Tibetan Plateau (TP) significantly impacts the global climate. TP's unique geographical conditions make it one of the areas with the largest precipitation biases in numerical models. The overestimation and distribution biases of precipitation in models are closely related to the parameterization of convection processes over the TP. In light of this, a new deep convective entrainment rate parameterization suitable for the region is developed based on convection observational data and is applied to the Grell‐Freitas Ensemble Scheme of the Weather Research and Forecasting Model. The new scheme significantly reduces the overestimation of simulated precipitation over the TP, decreasing the overestimation from 29.4% in the default scheme to 11.8%. The physical mechanism behind the improved simulation results is as follows: first, the entrainment rate of convection in the new scheme is closer to the observed results. Second, in terms of cloud macrophysics, the new scheme increases the convective entrainment rate, reduces the cloud top height and depth of convective clouds, and decreases the number of grids with updrafts in the vertical layers and grids with convective precipitation on the surface. Third, in terms of cloud microphysics, the increased entrainment rate reduces the cloud water content and weakens the intensity of convective precipitation. All of these mechanisms ultimately reduce the accumulated convective precipitation amount, providing an optimized modeling tool for weather and climate research over TP, which also aids in better assessing the water cycle and water resource reserves of the “Asian Water Tower.”https://doi.org/10.1029/2024MS004543convective entrainment rateconvection parameterizationTibetan plateauWRF |
| spellingShingle | Junjun Li Chunsong Lu Jinghua Chen Jian Li Jing Yang Xiaoqi Xu Lei Zhu Xin He Shiying Wu Development and Application of a New Convective Entrainment Rate Parameterization for Improving Precipitation Simulation Over the Tibetan Plateau and Its Surrounding Areas Journal of Advances in Modeling Earth Systems convective entrainment rate convection parameterization Tibetan plateau WRF |
| title | Development and Application of a New Convective Entrainment Rate Parameterization for Improving Precipitation Simulation Over the Tibetan Plateau and Its Surrounding Areas |
| title_full | Development and Application of a New Convective Entrainment Rate Parameterization for Improving Precipitation Simulation Over the Tibetan Plateau and Its Surrounding Areas |
| title_fullStr | Development and Application of a New Convective Entrainment Rate Parameterization for Improving Precipitation Simulation Over the Tibetan Plateau and Its Surrounding Areas |
| title_full_unstemmed | Development and Application of a New Convective Entrainment Rate Parameterization for Improving Precipitation Simulation Over the Tibetan Plateau and Its Surrounding Areas |
| title_short | Development and Application of a New Convective Entrainment Rate Parameterization for Improving Precipitation Simulation Over the Tibetan Plateau and Its Surrounding Areas |
| title_sort | development and application of a new convective entrainment rate parameterization for improving precipitation simulation over the tibetan plateau and its surrounding areas |
| topic | convective entrainment rate convection parameterization Tibetan plateau WRF |
| url | https://doi.org/10.1029/2024MS004543 |
| work_keys_str_mv | AT junjunli developmentandapplicationofanewconvectiveentrainmentrateparameterizationforimprovingprecipitationsimulationoverthetibetanplateauanditssurroundingareas AT chunsonglu developmentandapplicationofanewconvectiveentrainmentrateparameterizationforimprovingprecipitationsimulationoverthetibetanplateauanditssurroundingareas AT jinghuachen developmentandapplicationofanewconvectiveentrainmentrateparameterizationforimprovingprecipitationsimulationoverthetibetanplateauanditssurroundingareas AT jianli developmentandapplicationofanewconvectiveentrainmentrateparameterizationforimprovingprecipitationsimulationoverthetibetanplateauanditssurroundingareas AT jingyang developmentandapplicationofanewconvectiveentrainmentrateparameterizationforimprovingprecipitationsimulationoverthetibetanplateauanditssurroundingareas AT xiaoqixu developmentandapplicationofanewconvectiveentrainmentrateparameterizationforimprovingprecipitationsimulationoverthetibetanplateauanditssurroundingareas AT leizhu developmentandapplicationofanewconvectiveentrainmentrateparameterizationforimprovingprecipitationsimulationoverthetibetanplateauanditssurroundingareas AT xinhe developmentandapplicationofanewconvectiveentrainmentrateparameterizationforimprovingprecipitationsimulationoverthetibetanplateauanditssurroundingareas AT shiyingwu developmentandapplicationofanewconvectiveentrainmentrateparameterizationforimprovingprecipitationsimulationoverthetibetanplateauanditssurroundingareas |