DOI: 10.1175/JCLI-D-12-00775.1
Scopus记录号: 2-s2.0-84888059335
论文题名: Simulated changes in Northwest U.S. Climate in response to Amazon deforestation
作者: Medvigy D. ; Walko R.L. ; Otte M.J. ; Avissar R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 22 起始页码: 9115
结束页码: 9136
语种: 英语
Scopus关键词: Atmosphere-land interactions
; Characteristic length
; High resolution simulations
; Meso-scale models
; North America
; Regional climate changes
; Teleconnections
; Western United States
; Climate change
; Deforestation
; atmosphere-biosphere interaction
; atmosphere-hydrosphere interaction
; atmospheric general circulation model
; climate change
; deforestation
; extratropical environment
; precipitation (climatology)
; regional climate
; Rossby wave
; teleconnection
; temperature anomaly
; vorticity
; Amazonia
; Andes
; California
; Sierra Nevada [California]
; United States
英文摘要: Numerical models have long predicted that the deforestation of the Amazon would lead to large regional changes in precipitation and temperature, but the extratropical effects of deforestation have been a matter of controversy. This paper investigates the simulated impacts of deforestation on the northwest United States December-February climate. Integrations are carried out using the Ocean-Land-Atmosphere Model (OLAM), here run as a variable-resolution atmospheric GCM, configured with three alternative horizontal grid meshes: 1) 25-km characteristic length scale (CLS) over the United States, 50-km CLS over the Andes and Amazon, and 200-km CLS in the far-field; 2) 50-km CLS over the United States, 50-km CLS over the Andes and Amazon, and 200-km CLS in the far-field; and 3) 200-km CLS globally. In the high-resolution simulations, deforestation causes a redistribution of precipitation within the Amazon, accompanied by vorticity and thermal anomalies. These anomalies set up Rossby waves that propagate into the extratropics and impact western North America. Ultimately, Amazon deforestation results in 10%-20% precipitation reductions for the coastal northwest United States and the Sierra Nevada. Snowpack in the Sierra Nevada experiences declines of up to 50%. However, in the coarse-resolution simulations, this mechanism is not resolved and precipitation is not reduced in the northwest United States. These results highlight the need for adequate model resolution in modeling the impacts of Amazon deforestation. It is concluded that the deforestation of the Amazon can act as a driver of regional climate change in the extratropics, including areas of the western United States that are agriculturally important. © 2013 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51543
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geosciences and Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Atmospheric Modeling and Analysis Division, U.S. Environmental Protection Agency, Research Triangle Park, NC, United States
Recommended Citation:
Medvigy D.,Walko R.L.,Otte M.J.,et al. Simulated changes in Northwest U.S. Climate in response to Amazon deforestation[J]. Journal of Climate,2013-01-01,26(22)