globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2013JD020973
论文题名:
Investigating impacts of forest fires in Alaska and western Canada on regional weather over the northeastern United States using CAM5 global simulations to constrain transport to a WRF-Chem regional domain
作者: Zhao Z.; Kooperman G.J.; Pritchard M.S.; Russell L.M.; Somerville R.C.J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 21698996
出版年: 2014
卷: 119, 期:12
起始页码: 7515
结束页码: 7536
语种: 英语
英文关键词: AE-CAM5 ; aerosol-cloud interaction ; long-range transport ; WRF-Chem
Scopus关键词: Atmospheric aerosols ; Atmospheric chemistry ; Deforestation ; Fires ; Thermal plumes ; Weather forecasting ; AE-CAM5 ; Aerosol-cloud interaction ; Cloud liquid water path ; Community atmosphere model ; Long range transport ; National center for atmospheric researches ; Weather research and forecasting models ; WRF-Chem ; Atmospheric movements
英文摘要: An aerosol-enabled globally driven regional modeling system has been developed by coupling the National Center for Atmospheric Research's Community Atmosphere Model version 5 (CAM5) with the Weather Research and Forecasting model with chemistry (WRF-Chem). In this modeling system, aerosol-enabled CAM5, a state-of-the-art global climate model is downscaled to provide coherent meteorological and chemical boundary conditions for regional WRF-Chem simulations. Aerosol particle emissions originating outside the WRF-Chem domain can be a potentially important nonlocal aerosol source. As a test case, the potential impacts of nonlocal forest fire aerosols on regional precipitation and radiation were investigated over the northeastern United States during the summer of 2004. During this period, forest fires in Alaska and western Canada lofted aerosol particles into the midtroposphere, which were advected across the United States. WRF-Chem simulations that included nonlocal biomass burning aerosols had domain-mean aerosol optical depths that were nearly three times higher than those without, which reduced peak downwelling domain-mean shortwave radiation at the surface by ~25 W m-2. In this classic twin experiment design, adding nonlocal fire plume led to near-surface cooling and changes in cloud vertical distribution, while variations in domain-mean cloud liquid water path were negligible. The higher aerosol concentrations in the simulation with the fire plume resulted in a ~10% reduction in domain-mean precipitation coincident with an ~8% decrease in domain-mean CAPE. A suite of simulations was also conducted to explore sensitivities of meteorological feedbacks to the ratio of black carbon to total plume aerosols, as well as to overall plume concentrations. Results from this ensemble revealed that plume-induced near-surface cooling and CAPE reduction occur in a wide range of conditions. The response of moist convection was very complex because of strong thermodynamic internal variability. Key Points Nonlocal fire emissions resulted in ~10% precipitation reduction Nonlocal fire emissions reduced peak surface shortwave radiation at by 25 W m-2 An aerosol-enabled globally driven regional modeling system is developed ©2014. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63054
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States; Air Quality and Planning Science Division, California Air Resources Board, Sacramento, CA, United States; Department of Earth System Science, University of California, Irvine, CA, United States

Recommended Citation:
Zhao Z.,Kooperman G.J.,Pritchard M.S.,et al. Investigating impacts of forest fires in Alaska and western Canada on regional weather over the northeastern United States using CAM5 global simulations to constrain transport to a WRF-Chem regional domain[J]. Journal of Geophysical Research: Atmospheres,2014-01-01,119(12)
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