干旱区生态环境知识资源中心(Arid): Dust-Drought Nexus in the Southwestern United States: A Proxy-Model Comparison Approach

Arid

DOI	10.1029/2020PA004046
	Dust-Drought Nexus in the Southwestern United States: A Proxy-Model Comparison Approach
	Arcusa, S. H.; McKay, N. P.; Carrillo, C. M.; Ault, T. R.
通讯作者	Arcusa, SH (corresponding author), No Arizona Univ, Sch Earth & Sustainabil, Flagstaff, AZ 86011 USA.
来源期刊	PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
ISSN	2572-4517
EISSN	2572-4525
出版年	2020
卷号	35 期号:12
英文摘要	The U.S. Southwest is naturally prone to dust and drought. With a high risk of unprecedented drought in the future due to climate change, changes in the dust cycle are expected. Whereas paleo records of dust deposition from the region suggest that past megadroughts did not coincide with elevated dust levels, modern studies indicate higher dust during drier conditions. To examine this disagreement, we compare regional paleo records to output from the Community Earth System Model Last Millennium Ensemble experiment. We investigate the role of hydroclimate on dust emissions in the model and analyze how modeled dust during megadroughts compares to all other years. We find that bare ground, as directly modulated by the density of vegetation cover and indirectly by hydroclimate, is the primary control on simulated dust emissions in the Southwest. Furthermore, we find slightly (but significantly) higher dust emission during megadroughts than during years without megadroughts in the model. Using a simple forward modeling approach to assess the impact of age uncertainty in the regional dust records, we find that age uncertainty can explain most of the paleo data/model disagreement. The remaining difference could be related to processes that are not included in the model that inhibit dust emissions during drought, including brown vegetation and soil crusts. Our results suggest the dust-drought nexus is a continuum and that the impact of drought on dust cycling is subtle.
英文关键词	dust drought U S Southwest paleo model data comparison age uncertainty CESM‐ LME
类型	Article
语种	英语
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000603661700016
WOS关键词	EARTH SYSTEM MODEL ; SOIL-EROSION ; WIND EROSION ; DESERT DUST ; SOURCE AREA ; CLIMATE ; DEPOSITION ; VARIABILITY ; VEGETATION ; EMISSIONS
WOS类目	Geosciences, Multidisciplinary ; Oceanography ; Paleontology
WOS研究方向	Geology ; Oceanography ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349100
作者单位	[Arcusa, S. H.; McKay, N. P.] No Arizona Univ, Sch Earth & Sustainabil, Flagstaff, AZ 86011 USA; [Carrillo, C. M.; Ault, T. R.] Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY USA
推荐引用方式 GB/T 7714	Arcusa, S. H.,McKay, N. P.,Carrillo, C. M.,et al. Dust-Drought Nexus in the Southwestern United States: A Proxy-Model Comparison Approach[J],2020,35(12).
APA	Arcusa, S. H.,McKay, N. P.,Carrillo, C. M.,&Ault, T. R..(2020).Dust-Drought Nexus in the Southwestern United States: A Proxy-Model Comparison Approach.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,35(12).
MLA	Arcusa, S. H.,et al."Dust-Drought Nexus in the Southwestern United States: A Proxy-Model Comparison Approach".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 35.12(2020).