两次典型沙尘的WRF-Chem数值模拟:不同起沙方案模拟效果的评估  

Simulating two typical dust storms with the WRF-Chem model:Sensitivity of different dust emission schemes

作　　者：尹馨 谭成好 贾世国[2] 唐明金 YIN Xin;TAN Chenghao;JIA Shiguo;TANG Mingjin(State Key Laboratory of Organic Geochemistry/Guangdong Key Laboratory of Environmental Protection and Resources Utilization/Guangdong-Hong Kong-Macao Joint Laboratory for Environment Pollution and Control,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;School of Atmospheric Sciences,Sun Yat-Sen University,Guangzhou 510275,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院广州地球化学研究所,有机地球化学国家重点实验室/广东省环境资源利用与保护重点实验室/粤港澳大湾区环境污染过程与控制联合实验室,广东广州510640 [2]中山大学大气科学学院,广东广州510275 [3]中国科学院大学,北京100049

出　　处：《地球化学》2022年第5期528-539,共12页Geochimica

基　　金：国家重点研发计划(2018YFC0213901);国家自然科学基金(42022050)联合资助。

摘　　要：为探寻更适用于中国沙尘过程数值模拟的起沙方案,利用WRF-Chem模式分别耦合GOCART、AFWA和Shao04 3种不同起沙参数化方案对2017年5月3–5日和2018年3月26–29日发生在我国西北地区的2次典型沙尘过程进行数值模拟,并综合多种地面和卫星观测资料对模拟结果进行评估。结果表明:通过3种起沙方案计算得到的起沙量差距较大,其中GOCART方案在0~6μm粒径的起沙量最大、Shao04方案最小。从近地面PM浓度来看,3种方案均能反映出2次事件中典型城市PM浓度的变化特征,Shao04方案模拟的PM浓度和观测相关性最高;从气溶胶光学厚度(AOD)来看,通过与AERONET、MODIS和CALIPSO的观测资料综合比较,发现模拟结果对AOD存在系统性低估,GOCART方案与观测结果最近似,其次为Shao04方案,最后为AFWA方案。综合考虑认为,GOCART起沙方案相对更适用于我国西北地区的沙尘模拟。Dust emission events can cause large fluctuations in particulate matter concentrations and need to be considered to predict atmospheric events accurately.This study evaluated the impact of dust emission schemes on the performance of the WRF-Chem model by comparing the data collected from two severe dust events recorded during 3–5 May 2017 and 26–29 March 2018 over northwest China against three different simulation schemes;specifically,the WRF-Chem model coupled with the GOCART,AFWA and,Shao04 schemes.Results show that there is a significant difference between the simulated results of different dust emission schemes for both events:The GOCART scheme always presented the highest dust emission in the 0–6μm size range while the Shao04scheme had the lowest.While the trend of surface PMconcentration in typical cities was accurately predicted by all the dust emission schemes,the Shao04 scheme provided the best performance.Generally,the 3 dust emission schemes underestimated the aerosol optical depth (AOD) when compared with AERONET,MODIS and CALIPSO data.The GOCART scheme performed best,followed by Shao04 and AFWA schemes in AOD simulations.Overall the GOCART scheme is the best choice for dust simulation in northwest China.

关 键 词：沙尘 WRF-Chem 起沙参数化方案 

分 类 号：X823[环境科学与工程—环境工程] X831