干旱区生态环境知识资源中心(Arid): Models transport Saharan dust too low in the atmosphere: a comparison of the MetUM and CAMS forecasts with observations

Arid

DOI	10.5194/acp-20-12955-2020
	Models transport Saharan dust too low in the atmosphere: a comparison of the MetUM and CAMS forecasts with observations
	O'Sullivan, Debbie; Marenco, Franco; Ryder, Claire L.; Pradhan, Yaswant; Kipling, Zak; Ben Johnson; Benedetti, Angela; Brooks, Melissa; McGill, Matthew; Yorks, John; Selmer, Patrick
通讯作者	Marenco, F
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN	1680-7316
EISSN	1680-7324
出版年	2020
卷号	20 期号:21 页码:12955-12982
英文摘要	We investigate the dust forecasts from two operational global atmospheric models in comparison with in situ and remote sensing measurements obtained during the AERosol properties - Dust (AER-D) field campaign. Airborne elastic backscatter lidar measurements were performed on board the Facility for Airborne Atmospheric Measurements during August 2015 over the eastern Atlantic, and they permitted us to characterise the dust vertical distribution in detail, offering insights on transport from the Sahara. They were complemented with airborne in situ measurements of dust size distribution and optical properties, as well as datasets from the Cloud-Aerosol Transport System (CATS) spaceborne lidar and the Moderate Resolution Imaging Spectroradiometer (MODIS). We compare the airborne and spaceborne datasets to operational predictions obtained from the Met Office Unified Model (MetUM) and the Copernicus Atmosphere Monitoring Service (CAMS). The dust aerosol optical depth predictions from the models are generally in agreement with the observations but display a low bias. However, the predicted vertical distribution places the dust lower in the atmosphere than highlighted in our observations. This is particularly noticeable for the MetUM, which does not transport coarse dust high enough in the atmosphere or far enough away from the source. We also found that both model forecasts underpredict coarse-mode dust and at times overpredict fine-mode dust, but as they are fine-tuned to represent the observed optical depth, the fine mode is set to compensate for the underestimation of the coarse mode. As aerosol-cloud interactions are dependent on particle numbers rather than on the optical properties, this behaviour is likely to affect their correct representation. This leads us to propose an augmentation of the set of aerosol observations available on a global scale for constraining models, with a better focus on the vertical distribution and on the particle size distribution. Mineral dust is a major component of the climate system; therefore, it is important to work towards improving how models reproduce its properties and transport mechanisms.
类型	Article
语种	英语
开放获取类型	Green Submitted, Green Accepted, gold
收录类别	SCI-E
WOS记录号	WOS:000585733800008
WOS关键词	SHIP-BORNE LIDAR ; MINERAL DUST ; OPTICAL-PROPERTIES ; AIR LAYER ; VERTICAL-DISTRIBUTION ; AEROSOL PROPERTIES ; BOUNDARY-LAYER ; DESERT DUST ; SYSTEM ; AIRCRAFT
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/2XILL650/327303
作者单位	[O'Sullivan, Debbie; Marenco, Franco; Pradhan, Yaswant; Ben Johnson; Brooks, Melissa] Met Off, Exeter EX1 3PB, Devon, England; [Ryder, Claire L.] Univ Reading, Dept Meteorol, Reading RG6 6BB, Berks, England; [Kipling, Zak; Benedetti, Angela] European Ctr Medium Range Weather Forecasts, Reading RG2 9AX, Berks, England; [McGill, Matthew; Yorks, John; Selmer, Patrick] NASA, Goddard Space Flight Ctr, Code 916, Greenbelt, MD 20771 USA
推荐引用方式 GB/T 7714	O'Sullivan, Debbie,Marenco, Franco,Ryder, Claire L.,et al. Models transport Saharan dust too low in the atmosphere: a comparison of the MetUM and CAMS forecasts with observations[J],2020,20(21):12955-12982.
APA	O'Sullivan, Debbie.,Marenco, Franco.,Ryder, Claire L..,Pradhan, Yaswant.,Kipling, Zak.,...&Selmer, Patrick.(2020).Models transport Saharan dust too low in the atmosphere: a comparison of the MetUM and CAMS forecasts with observations.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(21),12955-12982.
MLA	O'Sullivan, Debbie,et al."Models transport Saharan dust too low in the atmosphere: a comparison of the MetUM and CAMS forecasts with observations".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.21(2020):12955-12982.