气候变化领域集成服务门户(CCPortal): Tropical Belt Width Proportionately More Sensitive to Aerosols Than Greenhouse Gases

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DOI	10.1029/2019GL086425
	Tropical Belt Width Proportionately More Sensitive to Aerosols Than Greenhouse Gases
	Zhao X.; Allen R.J.; Wood T.; Maycock A.C.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:7
英文摘要	The tropical belt has widened during the last several decades, and both internal variability and anthropogenic forcings have contributed. Although greenhouse gases and stratospheric ozone depletion have been implicated as primary anthropogenic drivers of tropical expansion, the possible role of other drivers remains uncertain. Here, we analyze the tropical belt width response to idealized perturbations in multiple models. Our results show that absorbing black carbon (BC) aerosol drives tropical expansion, and scattering sulfate aerosol drives contraction. BC, especially from Asia, is more efficient per unit radiative forcing than greenhouse gases in driving tropical expansion, particularly in the Northern Hemisphere. Tropical belt expansion (contraction) is associated with an increase (decrease) in extratropical static stability induced by absorbing (scattering) aerosol. Although a formal attribution is difficult, scaling the normalized expansion rates to the historical time period suggests that BC is the largest driver of the Northern Hemisphere tropical widening but with relatively large uncertainty. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Aerosols; Atmospheric radiation; Expansion; Greenhouse gases; Ozone layer; Sulfur compounds; Black carbon aerosol; Expansion rate; Internal variability; Northern Hemispheres; Radiative forcings; Static stability; Stratospheric ozone depletion; Sulfate aerosols; Tropics; aerosol; anthropogenic source; black carbon; greenhouse gas; historical time (human history); Northern Hemisphere; ozone depletion; radiative forcing; sulfate; tropical region; uncertainty analysis; Asia
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/170501
作者单位	Department of Earth and Planetary Sciences, University of California, Riverside, CA, United States; School of Earth and Environment, University of Leeds, Leeds, United Kingdom
推荐引用方式 GB/T 7714	Zhao X.,Allen R.J.,Wood T.,et al. Tropical Belt Width Proportionately More Sensitive to Aerosols Than Greenhouse Gases[J],2020,47(7).
APA	Zhao X.,Allen R.J.,Wood T.,&Maycock A.C..(2020).Tropical Belt Width Proportionately More Sensitive to Aerosols Than Greenhouse Gases.Geophysical Research Letters,47(7).
MLA	Zhao X.,et al."Tropical Belt Width Proportionately More Sensitive to Aerosols Than Greenhouse Gases".Geophysical Research Letters 47.7(2020).