WRF模式模拟低层温度日变化偏差对飑线模拟影响
投稿时间:2019-07-24  修订日期:2019-10-24  点此下载全文
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作者单位E-mail
李斌 南京信息工程大学 li.bin.118@163.com 
吴立广 复旦大学 liguangwu@fudan.edu.cn 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:全球气候模式和区域天气模式在对低层气温的模拟,尤其是对气温的日循环变化模拟一直存在较大偏差,而低层气温的偏差会进一步影响模式对极端天气(例如强对流天气)的模拟结果。本文选取了2009年6月14日发生在江苏省北部的一次飑线过程,通过WRF模式对此次飑线过程的模拟,发现WRF模式模拟低层日最高气温滞后实际观测2到3小时,并且模拟的傍晚低层气温的降温幅度低于实际观测2-3℃。通过敏感性试验证实,通过改变边界层参数化方案可以通过减弱边界层和自由大气的温度交换,一定程度上改善模拟结果。同时在不改变边界层方案的情况下,将地面自动加密观测站数据加入模拟中也对模拟结果有改进作用。
中文关键词:天气学  飑线  数值模拟  温度日变化
 
Effects of Diurnal Variation of Low-Level Temperature on Squall Line Simulation by WRF
Abstract:The global climate model and regional weather model have been deviating greatly from the simulation of low-level temperature, especially the diurnal cycle of temperature. The deviation of low-level temperature will further affect the simulation results of extreme weather (such as severe convective weather). In this paper, a squall line occurred in northern Jiangsu Province on June 14, 2009 is selected to discussed the diurnal cycle of WRF in simulating low-level temperature. The simulation results show that the WRF has defects in simulating the diurnal variation of low-level temperature, which mainly shows that the simulated maximum daily temperature lags behind the observation for 2 to 3 hours, and the simulated low-level temperature in the evening is lower than the observation for 2-3℃. Sensitivity experiment shows that by changing the parameterization scheme of the boundary layer, the simulation results can be improved to a certain extent by weakening the temperature exchange between the boundary layer and the free atmosphere. At the same time, without changing the boundary layer scheme, adding the ground automatic encryption observation station data into the simulation also improves the simulation results.
keywords:Synoptic meteorology  Squall line  Numerical simulation  Diurnal variation of temperature
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