BCC-CSM2-MR全球气候模式对东亚地区降水和气温的模拟评估  

Evaluation of the ability of BCC-CSM2-MR global climate model in simulating precipitation and temperature in East Asia

作　　者：李淑萍 全文杰 王正 陈奕卓 苏涛 颜鹏程[5] LI Shuping;QUAN Wenjie;WANG Zheng;CHEN Yizhuo;SU Tao;YAN Pengcheng(College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225000,Jiangsu,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;National Meteorological Information Center,Beijing 100081,China;College of Physical Science and Technology,Yangzhou University,Yangzhou 225000,Jiangsu,China;Institute of Arid Meteorology of China Meteorological Administration,Lanzhou 730020,China)

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225000 [2]天津大学水利工程仿真与安全国家重点实验室,天津300350 [3]国家气象信息中心,北京100081 [4]扬州大学物理科学与技术学院,江苏扬州225000 [5]中国气象局兰州干旱气象研究所,甘肃兰州730020

出　　处：《干旱气象》2023年第6期984-996,共13页Journal of Arid Meteorology

基　　金：国家自然科学基金项目(42175071、41905060、42205049)资助。

摘　　要：全球气候模式BCC-CSM2-MR(Beijing Climate Center-Climate System Model version 2-Medium Resolution)由国家(北京)气候中心自主研发并参与了第六阶段国际耦合模式比较计划,该模式在BCC-CSM1.1m版本基础上对大气辐射传输、深对流过程及重力波等方面进行了优化,因此,该模式对东亚地区降水和气温模拟能力的改进亟需进一步评估。本文主要基于不同格点观测数据集与中国区域站点观测数据,系统对比分析BCC-CSM2-MR、BCC-CSM1.1m两个模式版本对东亚地区季节平均降水(气温)和日极端降水(气温)的模拟能力。结果表明:(1)相比BCC-CSM1.1m,BCC-CSM2-MR改进了对东亚大部分区域季节平均降水的模拟能力,尤其是青藏高原地区夏季平均降水,明显提高了对中国东南地区、朝鲜半岛及日本降水月际变化的模拟性能;(2)BCC-CSM2-MR对东亚地区季节平均气温模拟能力改进不明显,且对东亚大部分区域气温月际变化的模拟误差大于BCC-CSM1.1m;(3)对日极端降水(气温),BCC-CSM2-MR的模拟能力优于BCC-CSM1.1m,明显提高了对中国东南地区日极端降水(气温)的模拟能力。总体而言,BCC-CSM2-MR在深对流过程参数方案中的改进有利于对东亚地区降水的模拟。The global climate model BCC-CSM2-MR(Beijing Climate Center-Climate System Model version 2-Medium Resolution)in⁃dependently developed by the National(Beijing)Climate Center,which has participated in the Climate Model Inter-comparison Project Phase 6.Based on the BCC-CSM1.1m version,the BCC-CSM2-MR model is optimized in aspects of atmospheric radiation transport scheme,deep convection processes and gravity wave drag.Therefore,the improvement of the model’s ability to simulate precipitation and temperature in East Asia needs further assessment.Utilizing gridded observational datasets and station observations in China,the paper thoroughly compares the performances of BCC-CSM2-MR and BCC-CSM1.1m in simulating seasonal mean precipitation(tem⁃perature)and daily precipitation(temperature)extremes in East Asia.The results are as follows:(1)Compared with the BCC-CSM1.1m,the BCC-CSM2-MR improves the model performance in simulating seasonal mean precipitation in most sub-regions of East Asia,espe⁃cially for summer precipitation in the Tibetan Plateau.In particular,the model can better reproduce the annual cycle of precipitation in southeastern China,the Korean Peninsula and Japan.(2)The ability of the BCC-CSM2-MR to simulate the seasonal mean temperature in East Asia has not been improved significantly,and the simulated biases of monthly temperature change in most sub-regions of East Asia are greater than those of the BCC-CSM1.1m.(3)In terms of daily extreme precipitation(temperature),the simulation ability of the BCC-CSM2-MR is obviously better than that of the BCC-CSM1.1m,which significantly improves the simulation ability of daily extreme precipitation(temperature)in southeast China.Overall,the improvement of the BCC-CSM2-MR in deep convection process parameter scheme is beneficial to the simulation of precipitation in East Asia.

关 键 词：BCC-CSM2-MR 东亚地区 模式评估 降水 气温 全球气候模式 

分 类 号：P467[天文地球—大气科学及气象学]