干旱区生态环境知识资源中心(Arid): A revised mineral dust emission scheme in GEOS-Chem: improvements in dust simulations over China

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DOI	10.5194/acp-21-4319-2021
	A revised mineral dust emission scheme in GEOS-Chem: improvements in dust simulations over China
	Tian, Rong; Ma, Xiaoyan; Zhao, Jianqi
通讯作者	Ma, XY (corresponding author), Nanjing Univ Informat Sci Technol, Key Lab Aerosol Cloud Precipitat China Meteorol A, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing 210044, Jiangsu, Peoples R China.
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN	1680-7316
EISSN	1680-7324
出版年	2021
卷号	21 期号:6 页码:4319-4337
英文摘要	Mineral dust plays a significant role in climate change and air quality, but large uncertainties remain in terms of dust emission prediction. In this study, we improved treatment of the dust emission process in a global 3-D chemical transport model (GEOS-Chem v12.6.0), by incorporating the geographical variation of aerodynamic roughness length (Z(0)), smooth roughness length (Z(0)s) and soil texture and by introducing the Owen effect and the formulation of the sand-blasting efficiency alpha by Lu and Shao (1999). To investigate the impact of the modifications incorporated in the model, several sensitivity simulations were performed for a severe dust storm during 27 March to 2 April 2015 over northern China. Results show that simulated threshold friction velocity is very sensitive to the updated Z(0) and Z(0)s field, with the relative difference ranging from 10% to 60% compared to the original model with a uniform value. The inclusion of the Owen effect leads to an increase in surface friction velocity, which mainly occurs in the arid and semi-arid regions of northwest China. The substitution of a fixed value of alpha assumed in the original scheme with one varying with friction velocity and soil texture based on observations reduces alpha by 50% on average, especially over regions with sand texture. Comparisons of sensitivity simulations and measurements show that the revised scheme with the implementation of updates provides more realistic threshold friction velocities and PM10 mass concentrations. The performance of the improved model has been evaluated against surface PM10 observations as well as MODIS aerosol optical depth (AOD) values, showing that the spatial and temporal variation of mineral dust are better captured by the revised scheme. Due to the inclusion of the improvement, average PM10 concentrations at observational sites are more comparable to the observations, and the average mean bias (MB) and normalized mean bias (NMB) values are reduced from -196.29 mu gm(-3) and -52.79% to -47.72 mu gm(-3) and 22.46% respectively. Our study suggests that the erodibility factor, sandblasting efficiency and soil-related properties which are simply assumed in the empirical scheme may lack a physical mechanism and spatial-temporal representativeness. Further study and measurements should be conducted to obtain a more realistic and detailed map of these parameters in order to improve dust representation in the model.
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000632219700003
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
来源机构	南京信息工程大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349621
作者单位	[Tian, Rong; Ma, Xiaoyan; Zhao, Jianqi] Nanjing Univ Informat Sci Technol, Key Lab Aerosol Cloud Precipitat China Meteorol A, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing 210044, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Tian, Rong,Ma, Xiaoyan,Zhao, Jianqi. A revised mineral dust emission scheme in GEOS-Chem: improvements in dust simulations over China[J]. 南京信息工程大学,2021,21(6):4319-4337.
APA	Tian, Rong,Ma, Xiaoyan,&Zhao, Jianqi.(2021).A revised mineral dust emission scheme in GEOS-Chem: improvements in dust simulations over China.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(6),4319-4337.
MLA	Tian, Rong,et al."A revised mineral dust emission scheme in GEOS-Chem: improvements in dust simulations over China".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.6(2021):4319-4337.