DOI: 10.1007/s00382-011-1150-x
Scopus记录号: 2-s2.0-84859004322
论文题名: The potential of vegetation feedback to alleviate climate aridity over the United States associated with a 2×CO2 climate condition
作者: Park C.-E. ; Ho C.-H. ; Jeong S.-J. ; Kim J. ; Feng S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-07-08 起始页码: 1489
结束页码: 1500
语种: 英语
英文关键词: Climate aridity
; Climate change
; Dynamic vegetation model
; Global warming
; Thornthwaite moisture index
; United States
; Vegetation feedback
英文摘要: This study examines the potential impact of vegetation feedback on changes in summer climate aridity over the contiguous United States (US) due to the doubling of atmospheric CO2 concentration using a set of 100-year-long climate simulations made by a global climate model interactively coupled with a dynamic vegetation model. The Thornthwaite moisture index (Im), which quantifies climate aridity on the basis of atmospheric water supply (i. e., precipitation) and atmospheric water demand (i. e., potential evapotranspiration, PET), is used to measure climate aridity. Warmer atmosphere and drier surface resulting from increased CO2 concentration increase climate aridity over most of the contiguous US. This phenomenon is due to larger increments in PET than in precipitation, regardless of the presence or absence of vegetation feedback. Compared to simulations without active dynamic vegetation feedback, the presence of vegetation feedback significantly alleviates the increase in aridity. This vegetation-feedback effect is most noticeable in the subhumid regions such as southern, midwestern and northwestern US, primarily by the increasing vegetation greenness. In these regions, the greening in response to warmer temperatures enhances moisture transfer from soil to atmosphere by evapotranspiration (ET). The increased ET and subsequent moistening over land areas result in weaker surface warming (1-2 K) and PET (3-10 mm month-1), and greater precipitation (4-10 mm month-1). Collectively, they result in moderate increases in Im. Our results suggest that moistening by enhanced vegetation feedback may prevent aridification under climatic warming especially in areas vulnerable to climate change, with consequent implications for mitigation strategies. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55341
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth and Environmental Sciences, Climate Physics Laboratory, Seoul National University, Seoul 151-747, South Korea; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE, United States; Princeton University, Princeton, NJ, United States
Recommended Citation:
Park C.-E.,Ho C.-H.,Jeong S.-J.,et al. The potential of vegetation feedback to alleviate climate aridity over the United States associated with a 2×CO2 climate condition[J]. Climate Dynamics,2012-01-01,38(2017-07-08)