| DOI: | 10.1002/2015GL064559
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| 论文题名: | Black carbon aerosol-induced Northern Hemisphere tropical expansion |
| 作者: | Kovilakam M.; Mahajan S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8687
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| EISSN: | 1944-8418
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| 出版年: | 2015
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| 卷: | 42, 期:12 | | 起始页码: | 4964
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| 结束页码: | 4972
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| 语种: | 英语
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| 英文关键词: | black carbon aerosol
; midlatitude warming
; tropical expansion
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| Scopus关键词: | Aerosols
; Atmospheric radiation
; Carbon
; Climate models
; Expansion
; Fog
; Troposphere
; Black carbon aerosol
; Community atmosphere model
; Global climate model
; Intertropical convergence zone
; Midlatitudes
; Northern hemisphere
; Northern Hemispheres
; Tropospheric temperature
; Tropics
; aerosol
; black carbon
; climate modeling
; concentration (composition)
; global climate
; heating
; midlatitude environment
; Northern Hemisphere
; radiative forcing
; spatial distribution
; temperature gradient
; tropical environment
; troposphere
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| 英文摘要: | Global climate models (GCMs) underestimate the observed trend in tropical expansion. Recent studies partly attribute it to black carbon (BC) aerosols, which are poorly represented in GCMs. We conduct a suite of idealized experiments with the Community Atmosphere Model version 4 coupled to a slab ocean model forced with increasing BC concentrations covering a large swath of the estimated range of current BC radiative forcing while maintaining their spatial distribution. The Northern Hemisphere (NH) tropics expand poleward nearly linearly as BC radiative forcing increases (0.7° W-1 m2), indicating that a realistic representation of BC could reduce GCM biases. We find support for the mechanism where BC-induced midlatitude tropospheric heating shifts the maximum meridional tropospheric temperature gradient poleward resulting in tropical expansion. We also find that the NH poleward tropical edge is nearly linearly correlated with the location of the Intertropical Convergence Zone, which shifts northward in response to increasing BC. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84947044900&doi=10.1002%2f2015GL064559&partnerID=40&md5=faca8fbb19827e4542b3362318d0444c
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8303
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Computational Earth Sciences Group, Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN, United States
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| Recommended Citation: | |
Kovilakam M.,Mahajan S.. Black carbon aerosol-induced Northern Hemisphere tropical expansion[J]. Geophysical Research Letters,2015-01-01,42(12).
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