干旱区生态环境知识资源中心(Arid): WRF/Chem 模式中两种起沙参数化方案对东亚地区一次强沙尘暴过程模拟的影响

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	WRF/Chem 模式中两种起沙参数化方案对东亚地区一次强沙尘暴过程模拟的影响
其他题名	Impact of Two Different Dust Emission Schemes on the Simulation of a Severe Dust Storm in East Asia Using the WRF/Chem Model
	吴成来; 林朝晖
来源期刊	气候与环境研究
ISSN	1006-9585
出版年	2014
卷号	19 期号:4 页码:419-436
中文摘要	利用耦合了GOCART 和Shao04两种起沙参数化方案的WRF/Chem 模式对2002年3月19~22日发生在东亚地区的强沙尘暴过程进行模拟,着重考察了不同起沙方案对沙尘暴过程模拟的影响。结果表明,耦合了两种不同方案的WRF/Chem 总体上均能较合理地模拟出主要的起沙区域、起沙强度的变化以及沙尘浓度的时空演变特征,模式对沙尘源地附近及下游地区地面沙尘浓度时间变化特征的模拟与站点观测结果也十分接近。但总体说来 Shao04方案对沙尘起沙的发生以及强度变化过程具有更好的模拟能力,该方案模拟的沙尘浓度与观测更为一致,整体性能要优于GOCART方案。进一步分析发现,由于GOCART方案中采用的临界起沙风速偏小,导致该方案下模拟的沙尘分布范围偏大;另外该方案忽略了蒙古东南部和内蒙古中东部的潜在沙尘源地,从而使得耦合了 GOCART方案的模式未能模拟出上述区域的起沙过程,使得该区域及下游地区模拟的沙尘浓度也偏小。但在塔里木盆地,Shao04方案计算的起沙通量偏小,这可能与Shao04方案未能考虑风速较小情况下空气拖曳力夹卷作用对起沙的影响有关,也可能与该方案中采用的土壤质地数据不准确有关。
英文摘要	A severe dust event during 19-22 March 2002 over East Asia was simulated by using the Weather Research and Forecasting/Chemistry (WRF/Chem) model coupled with two different dust emission schemes (the GOCART and Shao04 schemes) to investigate the impact of dust emission schemes on model performance. A comparison with observational data shows that the main observed dust emission regions, the temporal variation of dust emission intensity, and the evolution of surface dust concentration are all quite well reproduced. Both near the dust source and in its downstream regions, the model-simulated temporal variation in surface dust concentration agrees closely with station observations. Generally, the WRF/Chem model with the Shao04 scheme shows better performance, especially in simulating the occurrence and intensity of dust emission and the surface dust concentration distribution. Further analysis shows that the dust emission regions simulated by the GOCART scheme are broader than those from observational data, which might be ascribed to the lower criteria value of the threshold wind velocity at the surface. In addition, the GOCART scheme could not resolve the potential dust source in the southeast of Mongolia and the middle?east of Inner Mongolia, which leads to the underestimation of dust concentration in this area and in downwind regions. However, the simulated dust emission flux in Taklimakan with the Shao04 scheme is lower compared with observations. This could be ascribed to the fact that the effect of aerodynamic lift in the dust emission is not considered in the Shao04 scheme. Moreover, the inaccurate parent soil texture for the Taklimakan Desert used in the Shao04 scheme might be another possible reason for the discrepancy.
中文关键词	起沙参数化方案 ; 强沙尘暴 ; WRF/Chem模式 ; 数值模拟 ; 临界摩擦速度 ; 下垫面状况
英文关键词	Dust emission parameterization Severe dust storm WRF/Chem model Numerical simulation Threshold wind velocity Land surface characteristic
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:5196010
来源机构	中国科学院大气物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231522
作者单位	中国科学院大气物理研究所国际气候与环境科学中心, 北京 100029, 中国
推荐引用方式 GB/T 7714	吴成来,林朝晖. WRF/Chem 模式中两种起沙参数化方案对东亚地区一次强沙尘暴过程模拟的影响[J]. 中国科学院大气物理研究所,2014,19(4):419-436.
APA	吴成来,&林朝晖.(2014).WRF/Chem 模式中两种起沙参数化方案对东亚地区一次强沙尘暴过程模拟的影响.气候与环境研究,19(4),419-436.
MLA	吴成来,et al."WRF/Chem 模式中两种起沙参数化方案对东亚地区一次强沙尘暴过程模拟的影响".气候与环境研究 19.4(2014):419-436.