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DOI	10.1175/JCLI-D-20-0423.1
	The effect of anthropogenic aerosols on the aleutian low
	Dow W.J.; Maycock A.C.; Lofverstrom M.; Smith C.J.
发表日期	2021
ISSN	08948755
起始页码	1725
结束页码	1741
卷号	34 期号:5
英文摘要	Past studies have suggested that regional trends in anthropogenic aerosols can influence the Pacific decadal oscillation (PDO) through modulation of the Aleutian low. However, the robustness of this connection is debated. This study analyzes changes to the Aleutian low in an ensemble of climate models forced with large, idealized global and regional black carbon (BC) and sulfate aerosol perturbations. To isolate the role of ocean feedbacks, the experiments are performed with an interactive ocean and with prescribed sea surface temperatures. The results show a robust weakening of the Aleutian low forced by a global tenfold increase in BC in both experiment configurations. A linearized steady-state primitive equation model is forced with diabatic heating anomalies to investigate the mechanisms through which heating from BC emissions influences the Aleutian low. The heating from BC absorption over India and East Asia generates Rossby wave trains that propagate into the North Pacific sector, forming an upper-tropospheric ridge. Sources of BC outside of East Asia enhance the weakening of the Aleutian low. The responses to a global fivefold and regional tenfold increase in sulfate aerosols over Asia show poor consistency across climate models, with a multimodel mean response that does not project strongly onto the Aleutian low. These findings for a large, idealized step increase in regional sulfate aerosol differ from previous studies that suggest the transient increase in sulfate aerosols over Asia during the early twenty-first century weakened the Aleutian low and induced a transition to a negative PDO phase. © 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Aerosols/particulates; Model comparison; Pacific decadal oscillation; Primitive equations model; Rossby waves
语种	英语
scopus关键词	Aerosols; Equations of state; Mechanical waves; Oceanography; Sulfur compounds; Surface waters; Anthropogenic aerosols; Diabatic heating; North Pacific; Pacific decadal oscillation; Primitive equations; Regional trends; Sea surface temperature (SST); Sulfate aerosols; Climate models; aerosol; anthropogenic source; black carbon; comparative study; modeling; Pacific Decadal Oscillation; Rossby wave; Asia
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178707
作者单位	School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Department of Geosciences, University of Arizona, Tucson, AZ, United States; International Institute for Applied Systems Analysis, Laxenburg, Austria
推荐引用方式 GB/T 7714	Dow W.J.,Maycock A.C.,Lofverstrom M.,et al. The effect of anthropogenic aerosols on the aleutian low[J],2021,34(5).
APA	Dow W.J.,Maycock A.C.,Lofverstrom M.,&Smith C.J..(2021).The effect of anthropogenic aerosols on the aleutian low.Journal of Climate,34(5).
MLA	Dow W.J.,et al."The effect of anthropogenic aerosols on the aleutian low".Journal of Climate 34.5(2021).