Arid
DOI10.5194/acp-12-1611-2012
The Mineral Dust Cycle in EMAC 2.40: sensitivity to the spectral resolution and the dust emission scheme
Glaeser, G.1; Kerkweg, A.1; Wernli, H.2
通讯作者Glaeser, G.
来源期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2012
卷号12期号:3页码:1611-1627
英文摘要

This first detailed analysis of the mineral dust cycle in the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model system investigates the performance of two dust emission schemes, following the approach of Balkanski et al. (2004) and Tegen et al. (2002), respectively, and the influence of the horizontal model resolution. Here the spectral resolutions T42, T63, T85, and T106 are investigated. A basic sulphur chemistry, enabling the coating of insoluble dust particles to make them soluble, is employed in order to realistically describe the ageing and wet deposition of mineral dust. Independent of the dust emission scheme the five-year simulations with the horizontal resolutions T42 and T63 produce unrealistically high emissions at some grid points in the Tarim Basin in Central Asia, leading to very high dust loads in polar regions. With these coarse resolutions, dust source grid points in the basin and elevated grid points of the Himalayas with high wind speeds cannot be distinguished, causing this overestimation. In T85 and T106 these regions are well separated and considerably less dust is emitted there. With the chosen model setup, the dust emission scheme by Balkanski et al. (2004) places the global maximum of emissions in the Thar Desert in India. This is unrealistic as the Sahara Desert is known to be the largest dust source in the world. This is the main deficiency of this scheme compared to the one by Tegen et al. (2002), which, based on a qualitative comparison to AEROCOM data, produces a very reasonable distribution of emissions and dust loads in simulations with resolutions T85 and T106. For future climate simulations with EMAC focusing on mineral dust, we recommend to use the dust emission scheme by Tegen et al. (2002) and a model resolution of at least T85. Simulations of two selected episodes and comparison to observational data sets show that in this model configuration EMAC is able to realistically simulate also intense, episodic events of dust emission and long-range transport.


类型Article
语种英语
国家Germany ; Switzerland
收录类别SCI-E
WOS记录号WOS:000300656500025
WOS关键词SUBMODEL SYSTEM MESSY ; CLIMATE MODEL ECHAM5-HAM ; MARINE BOUNDARY-LAYER ; SAHARAN DUST ; TECHNICAL NOTE ; CONSISTENT SIMULATION ; DAILY MORTALITY ; GOCART MODEL ; ICE NUCLEI ; SAMUM 2006
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/171411
作者单位1.Johannes Gutenberg Univ Mainz, Inst Atmospher Phys, D-55099 Mainz, Germany;
2.Swiss Fed Inst Technol, Inst Atmospher & Climate Sci, Zurich, Switzerland
推荐引用方式
GB/T 7714
Glaeser, G.,Kerkweg, A.,Wernli, H.. The Mineral Dust Cycle in EMAC 2.40: sensitivity to the spectral resolution and the dust emission scheme[J],2012,12(3):1611-1627.
APA Glaeser, G.,Kerkweg, A.,&Wernli, H..(2012).The Mineral Dust Cycle in EMAC 2.40: sensitivity to the spectral resolution and the dust emission scheme.ATMOSPHERIC CHEMISTRY AND PHYSICS,12(3),1611-1627.
MLA Glaeser, G.,et al."The Mineral Dust Cycle in EMAC 2.40: sensitivity to the spectral resolution and the dust emission scheme".ATMOSPHERIC CHEMISTRY AND PHYSICS 12.3(2012):1611-1627.
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