大气科学2025，Vol.49Issue(4)：969-985,17.DOI:10.3878/j.issn.1006-9895.2504.25038
CAS-ESM2.0模式中植被水力方案的引入对中国夏季降水模拟的影响
Introducing Plant Hydraulic Parameterization Scheme into Model CAS-ESM2.0 and Its Impact on Simulation of Summer Precipitation over China
摘要
Abstract
Based on CAS-ESM2.0(the second-generation Chinese Academy of Sciences Earth System Model),this study first introduced a PHS(plant hydraulics scheme)into the land surface component model,CoLM(Common Land Model),to replace the original empirical scheme.Subsequently,two sets of 34-year(1981-2014)Atmospheric Model Intercomparison Project numerical simulation experiments were performed to investigate the impacts of the improved PHS on the simulation of summer precipitation over China.The results demonstrated that the improved PHS significantly reduced the climatological biases in the CAS-ESM2.0 model in summer precipitation simulation.Notably,the updated scheme reduced the underestimation of precipitation in eastern China and the Tibetan Plateau,as well as the overestimation of precipitation in the western Sichuan region.Additionally,the scheme enhanced the simulation of interannual variability of summer precipitation and the frequency of extreme heavy rainfall days.Further analysis revealed that the improved PHS substantially reduced model biases in soil moisture,specifically the overly dry bias over the Yangtze River basin and the wet bias over the Tibetan Plateau.The modifications also reduced biases in the simulation of surface sensible heat flux and surface latent heat flux over the Yangtze River basin,North China,and Tibetan Plateau,thereby improving the model's representation of land-atmosphere interactions.The improved land-atmosphere coupling significantly enhanced the model's ability to simulate the East Asian monsoon circulation.Specifically,the improved model demonstrated a reduction in negative bias when simulating sea-level pressure over the northwestern Pacific,which favored the intensification of the southwest monsoon and enhanced moisture transport from the northwestern Pacific to eastern China.Concurrently,an anticyclonic circulation anomaly was detected in the lower troposphere,which effectively mitigated model biases in the underestimation of weak southerly winds and insufficient moisture convergence over eastern China,resulting in a remarkable reduction of precipitation underestimation in eastern China.These findings underscore the importance of accurately representing land-atmosphere interactions,particularly by incorporating plant hydraulic processes,for improving simulations of East Asian summer precipitation.关键词
植被水力参数化/陆面过程模式/夏季降水模拟/地球系统模式Key words
Plant hydraulic parameterization/Land surface model/Summer precipitation simulation/Earth system model分类
天文与地球科学引用本文复制引用
林朝晖,张汇玮,魏楠,张贺,陆星劼,吴成来,戴永久..CAS-ESM2.0模式中植被水力方案的引入对中国夏季降水模拟的影响[J].大气科学,2025,49(4):969-985,17.基金项目
国家重点研发计划项目 2022YFE0195900,国家自然科学基金项目 42275173,国家重大科技基础设施"地球系统数值模拟装置"项目,南方海洋科学与工程广东省实验室(珠海)项目SML2023SP216 National Key Research and Development Program of China(Grant 2022YFE0195900),National Natural Science Foundation of China(Grant 42275173),National Key Scientific and Technological Infrastructure Project of China"Earth System Science Numerical Simulator Facility",Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(Grant SML2023SP216) （珠海）
