南京大学学报（自然科学版）2025，Vol.61Issue(3)：353-362,10.DOI:10.13232/j.cnki.jnju.2025.03.001
地形重力波拖曳对四川盆地一次低温过程的影响机理研究
Impact of orographic gravity wave drag on a low temperature event in the Sichuan Basin
摘要
Abstract
Affected by the upper-level trough and strong cold air,from April 20th to 22nd,2023,significant strong cooling weather occurred in Sichuan Province and its surrounding areas.To explore the impact and mechanism of the orographic gravity wave parameterization scheme on low temperature in complex terrain areas,combining reanalysis data with SWC-WARR(South West Center-WRF ADAS Rapid Refresh),sensitivity experiments of the orographic gravity wave parameterization were carried out.By analyzing the simulation results,it was found that the GWD experiment could effectively improve the warm bias in temperature simulation of the CTL experiment in the central part of the western Sichuan Plateau and the Sichuan Basin.To explore the reasons for the improvement of the warm bias,by analyzing the 500 hPa horizontal wind field,it was found that the drag weakened the wind speed in the central part of the Qinghai-Xizang Plateau(QXP)and enhanced the westerly flow around the southern slope of the QXP,thus strengthening the wind speed in the western Sichuan Plateau.After scale separation using Barnes filtering,it was found that the change in the large-scale wind field was the main cause of the change in the simulated wind field.The increase in the southwesterly wind speed on the southern slope of the QXP in the GWD experiment led to an increase in cold advection,which was the main reason for the improvement of the warm bias in the western Sichuan Plateau,while the improvement of the warm bias in the Sichuan Basin was caused by the weakening of the warm advection in the southeastern part of the basin at 850 hPa.关键词
复杂地形/地形重力波拖曳/低温/西南区域业务模式Key words
complex terrain/orographic gravity wave drag/low temperature/SWC-WARR分类
天文与地球科学引用本文复制引用
季玉枝,艾真珍,衡志炜,徐昕..地形重力波拖曳对四川盆地一次低温过程的影响机理研究[J].南京大学学报（自然科学版）,2025,61(3):353-362,10.基金项目
国家重点研发计划(2023YFC3007502) （2023YFC3007502）
