globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016MS000902
Scopus记录号: 2-s2.0-85018831364
论文题名:
Fast and slow shifts of the zonal-mean intertropical convergence zone in response to an idealized anthropogenic aerosol
作者: Voigt A; , Pincus R; , Stevens B; , Bony S; , Boucher O; , Bellouin N; , Lewinschal A; , Medeiros B; , Wang Z; , Zhang H
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期:2
起始页码: 870
结束页码: 892
语种: 英语
英文关键词: Aerosols ; Atmospheric aerosols ; Atmospheric temperature ; Climate models ; Oceanography ; Rain ; Surface waters ; Anthropogenic aerosols ; Atmospheric heating ; Energetic analysis ; Energy transport ; Intertropical convergence zone ; ITCZ ; Sea surface temperature (SST) ; Tropical rain ; Atmospheric movements ; aerosol ; atmospheric modeling ; clear sky ; climate forcing ; cooling ; energy balance ; energy flow ; evaporation ; heating ; intertropical convergence zone ; radiative transfer ; sea surface temperature ; surface energy ; tropical region
英文摘要: Previous modeling work showed that aerosol can affect the position of the tropical rain belt, i.e., the intertropical convergence zone (ITCZ). Yet it remains unclear which aspects of the aerosol impact are robust across models, and which are not. Here we present simulations with seven comprehensive atmosphere models that study the fast and slow impacts of an idealized anthropogenic aerosol on the zonal-mean ITCZ position. The fast impact, which results from aerosol atmospheric heating and land cooling before sea-surface temperature (SST) has time to respond, causes a northward ITCZ shift. Yet the fast impact is compensated locally by decreased evaporation over the ocean, and a clear northward shift is only found for an unrealistically large aerosol forcing. The local compensation implies that while models differ in atmospheric aerosol heating, this does not contribute to model differences in the ITCZ shift. The slow impact includes the aerosol impact on the ocean surface energy balance and is mediated by SST changes. The slow impact is an order of magnitude more effective than the fast impact and causes a clear southward ITCZ shift for realistic aerosol forcing. Models agree well on the slow ITCZ shift when perturbed with the same SST pattern. However, an energetic analysis suggests that the slow ITCZ shifts would be substantially more model-dependent in interactive-SST setups due to model differences in clear-sky radiative transfer and clouds. We also discuss implications for the representation of aerosol in climate models and attributions of recent observed ITCZ shifts to aerosol. © 2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75781
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research-Department Troposphere Research, Karlsruhe, Germany; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Boulder, CO, United States; Physical Sciences Division, NOAA/Earth System Research Lab, Boulder, CO, United States; Max Planck Institute for Meteorology, Hamburg, Germany; LMD/IPSL, CNRS, Université Pierre et Marie Curie, Paris, France; Department of Meteorology, University of Reading, Reading, United Kingdom; Department of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; National Center for Atmospheric Research, Boulder, CO, United States; Chinese Academy of Meteorological Sciences, Beijing, China; National Climate Center, China Meteorological Administration, Beijing, China

Recommended Citation:
Voigt A,, Pincus R,, Stevens B,et al. Fast and slow shifts of the zonal-mean intertropical convergence zone in response to an idealized anthropogenic aerosol[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(2)
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