气候变化领域集成服务门户(CCPortal): A La Niña-Like Climate Response to South African Biomass Burning Aerosol in CESM Simulations

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DOI	10.1029/2019JD031832
	A La Niña-Like Climate Response to South African Biomass Burning Aerosol in CESM Simulations
	Amiri-Farahani A.; Allen R.J.; Li K.-F.; Nabat P.; Westervelt D.M.
发表日期	2020
ISSN	2169897X
卷号	125 期号:6
英文摘要	The climate response to atmospheric aerosols, including their effects on dominant modes of climate variability like El Niño–Southern Oscillation (ENSO), remains highly uncertain. This is due to several sources of uncertainty, including aerosol emission, transport, removal, vertical distribution, and radiative properties. Here, we conduct coupled ocean-atmosphere simulations with two versions of the Community Earth System Model (CESM) driven by semiempirical fine-mode aerosol direct radiative effects without dust and sea salt. Aerosol atmospheric heating off the west coast of Africa—most of which is due to biomass burning—leads to a significant atmospheric dynamical response, including localized ascent and upper-level divergence. Coupled Model Intercomparison Project version 6 (CMIP6) biomass burning simulations support this response. Moreover, CESM shows that the anomalous aerosol heating in the Atlantic triggers an atmospheric teleconnection to the tropical Pacific, including strengthening of the Walker circulation. The easterly trade winds accelerate, and through coupled ocean-atmosphere processes and the Bjerknes feedback, a La Niña-like response develops. Observations also support a relationship between south African biomass burning emissions and ENSO, with La Niña events preceding strong south African biomass burning in boreal fall. Our simulations suggest a possible two-way feedback between ENSO and south African biomass burning, with La Niña promoting more biomass burning emissions, which may then strengthen the developing La Niña. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	aerosol; Africa; biomass; climate model; La Nina; teleconnection
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186111
作者单位	Now at Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States; Department of Environmental Sciences, University of California, Riverside, CA, United States; Department of Earth and Planetary Sciences, University of California, Riverside, CA, United States; Centre National de Recherches Météorologiques, UMR3589, Météo-France-CNRS, Toulouse, France; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
推荐引用方式 GB/T 7714	Amiri-Farahani A.,Allen R.J.,Li K.-F.,et al. A La Niña-Like Climate Response to South African Biomass Burning Aerosol in CESM Simulations[J],2020,125(6).
APA	Amiri-Farahani A.,Allen R.J.,Li K.-F.,Nabat P.,&Westervelt D.M..(2020).A La Niña-Like Climate Response to South African Biomass Burning Aerosol in CESM Simulations.Journal of Geophysical Research: Atmospheres,125(6).
MLA	Amiri-Farahani A.,et al."A La Niña-Like Climate Response to South African Biomass Burning Aerosol in CESM Simulations".Journal of Geophysical Research: Atmospheres 125.6(2020).