热带气象学报2011，Vol.27Issue(3)：357-364,8.DOI:10.3969/j.issn.1004-4965.2011.03.008
基于拉格朗日方法的气流轨迹模式在判定南海夏季风爆发时间中的应用分析
ANALYSIS ON APPLICATION OF AN AIRFLOW TRAJECTORY MODEL BASED ON LAGRANGIAN METHOD IN DETERMINATION OF THE ONSET DATE OF THE SOUTH CHINA SEA SUMMER MONSOON
摘要
Abstract
Using U.S.National Centers for Environmental Prediction (NCEP) reanalysis data and an airflow trajectory model based on the Lagrangian method (HYSPLITv4.9), we simulated the daily backward trajectories on the 850 hPa level above the South China Sea (SCS) area from April to June.The onset date of the South China Sea summer monsoon from 1948-2009 is determinated according to the simulated source of airflow in the monitored area of the South China Sea.With analysis of 62-year South China Sea monsoon onset dates, we found that the number of early onset years accounted for 13％, late onset years accounted for 14％, and normal onset years accounted for 73％, of the total.Comparative analyses with the Lagrangian method and two other methods were performed, which combined wind and potential pseudo-equivalent temperature in determination of the onset date of the monsoon.In some years, the southwest airflow in the monitoring area of the South China Sea originates from the subtropical region prior to the onset of the monsoon, so that the subtropical airflow can be distinguished from the tropical airflow by using the Lagrangian method.The simulation results of the trajectory model show that in some years, after the onset date of the monsoon, the South China Sea is controlled by the southeast wind instead of the southeast wind in usual time.关键词
气候学/南海夏季风/拉格朗日方法/轨迹模式Key words
Climatology/ South China Sea summer monsoon/ Lagrangian method/ trajectory model分类
天文与地球科学引用本文复制引用
梁卓然,江志红,刘征宇,顾婷婷..基于拉格朗日方法的气流轨迹模式在判定南海夏季风爆发时间中的应用分析[J].热带气象学报,2011,27(3):357-364,8.基金项目
公益性行业(气象)科研专项(GYHY200906016) （气象）
江苏省高校自然科学重大基础(07KJA7020)共同资助 （07KJA7020）
