气候变化领域集成服务门户(CCPortal): Linear Relation Between Shifting ITCZ and Dust Hemispheric Asymmetry

CCPortal

DOI	10.1029/2020GL090499
	Linear Relation Between Shifting ITCZ and Dust Hemispheric Asymmetry
	Evans S.; Dawson E.; Ginoux P.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	Mineral dust is emitted primarily from arid regions, which may shrink or expand in one or both hemispheres, producing a complex and asymmetric pattern of radiative forcing that varies on interannual to millennial timescales. We assess the impact of hemispheric dust asymmetry on tropical precipitation. Using the Geophysical Fluid Dynamics Laboratory (GFDL) coupled climate model CM3 to simulate dust emission, we vary source strength in each hemisphere individually. Hemispherically asymmetric dust emission produces asymmetric dust load and radiative forcing. We find that the Intertropical Convergence Zone (ITCZ) shifts away from the hemisphere with enhanced dust load in response to the forcing asymmetry. We find significant linear relationships between the hemispheric imbalance and the latitude of tropical precipitation globally, in the Pacific, and especially in the Atlantic basin. This relationship offers a first-order estimation of dust effects on the hydrological cycle when investigating records of paleodust and for accurately predicting dust effects and feedbacks on future climate. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atmospheric radiation; Climate models; Tropics; Asymmetric patterns; Coupled climate model; Geophysical fluid dynamics laboratories; Hemi-spheric asymmetries; Hydrological cycles; Intertropical convergence zone; Linear relationships; Tropical precipitation; Dust; arid region; climate modeling; dust; fluid dynamics; hydrological cycle; intertropical convergence zone; precipitation assessment; radiative forcing; Atlantic Ocean; Pacific Ocean
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169471
作者单位	Department of Geography, University at Buffalo, Buffalo, NY, United States; RENEW Institute, University at Buffalo, Buffalo, NY, United States; Department of Geophysics, Stanford University, Stanford, CA, United States; Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Evans S.,Dawson E.,Ginoux P.. Linear Relation Between Shifting ITCZ and Dust Hemispheric Asymmetry[J],2020,47(22).
APA	Evans S.,Dawson E.,&Ginoux P..(2020).Linear Relation Between Shifting ITCZ and Dust Hemispheric Asymmetry.Geophysical Research Letters,47(22).
MLA	Evans S.,et al."Linear Relation Between Shifting ITCZ and Dust Hemispheric Asymmetry".Geophysical Research Letters 47.22(2020).