大气科学2017，Vol.41Issue(3)：603-617,15.DOI:10.3878/j.issn.1006-9895.1609.16185
FGOALS模式对梅雨期东亚副热带西风急流变化特征的模拟
FGOALS Model Simulation of Variation of East Asian Subtropical Westerly Jet during Meiyu Period
摘要
Abstract
Based on the Coupled Model Inter-comparison Project (CMIPS) coordinated experiments results simulated by the IAP Flexible Global Ocean-Atmosphere-Land System Model (FGOALS),the temporal and spatial variation characteristics of the East Asian Subtropical Westerly Jet (EASWJ) could be well captured.In particular,the land and sea patterns of the EASWJ divided by the borderline of 120°E were also well reproduced.Compared with the NCEP/NCAR reanalysis data,some biases in the intensity and position of the EASWJ simulated by the FGOALS model during the Meiyu period were found.FGOALS could reproduce the characteristic morphological changes in the EASWJ over the Northwest Pacific during the period of ENSO evolution,but the simulated intensity and characteristic eastward extension of the EASWJ in E1 Nino years and its westward shrinkage in La Nina years were different to that of observations.According to the thermal wind principle,geostrophic wind relationship and wave activity flux,and so on,possible reasons for the simulated biases were investigated.The simulated Tibetan Plateau heating effect decreased and the convection in the low latitudes weakened,which led to decreases in ascending motion in the middle and upper troposphere and less latent heating.As a result,anomalously cooling occurred at the middle and upper troposphere and the South Asia High (SAH) weakened.The meridional temperature gradient,the pressure gradient force on the northern side of the SAH,and the atmospheric internal dynamic effects all became anomalously weak,resulting in the deviation of the intensity and location of the EASWJ.The position and intensity of the EASWJ during the Meiyu period are closely associated with the spatial distribution and intensity of heavy precipitation in the middle and lower reaches of the Yangtze River.The position of the simulated EASWJ was obviously more northward and westward and its intensity was weaker than observation.This explained why the simulated Meiyu precipitation amount became less,especially in the lower reaches of the Yangtze River.In addition,the atmospheric circulation anomalies simulated by the FGOALS model in the years of ENSO need to be improved.关键词
东亚副热带西风急流/温度经向梯度/南亚高压Key words
East Asian subtropical westerly jet/Meridional temperature gradient/South Asia high分类
天文与地球科学引用本文复制引用
杜银,包庆,谢志清..FGOALS模式对梅雨期东亚副热带西风急流变化特征的模拟[J].大气科学,2017,41(3):603-617,15.基金项目
国家重点基础研究发展计划(973计划)项目2015CB453200,国家自然科学基金资助项目41205063、91337110和41475084,中国气象局气候变化专项CCSF201411,中国气象局预报预测核心业务发展专项CMAHX20160404,淮河流域气象开放科研基金项目HRM201605,江苏省高校“青蓝工程”项目 （973计划）
National Basic Research Program of China (973 Program) (Grant 2015CB453200),National Natural Science Foundation (Grants 41205063,91337110,41475084),Special Climate Change of China Meteorological Administration (Grant CCSF2014儿),Special Developing Projects of Key Forecasting Technology of China Meteorological Administration (Grant CMAHX20160404),Huaihe River Basin Open Research Foundation (Grant HRM201605),"Qinglan" Project of Jiangsu Province （973 Program）
