DOI: 10.1175/JCLI-D-15-0369.1
Scopus记录号: 2-s2.0-84947554111
论文题名: The response of precipitation minus evapotranspiration to climate warming: Why the "Wet-get-wetter, dry-get-drier" scaling does not hold over land
作者: Byrne M.P. ; O'Gorman P.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 20 起始页码: 8078
结束页码: 8092
语种: 英语
英文摘要: Simulations with climate models show a land-ocean contrast in the response of P - E (precipitation minus evaporation or evapotranspiration) to global warming, with larger changes over ocean than over land. The changes over ocean broadly follow a simple thermodynamic scaling of the atmospheric moisture convergence: the so-called "wet-get-wetter, dry-get-drier" mechanism. Over land, however, the simple scaling fails to give any regions with decreases in P - E, and it overestimates increases in P - E compared to the simulations. Changes in circulation cause deviations from the simple scaling, but they are not sufficient to explain this systematic moist bias. It is shown here that horizontal gradients of changes in temperature and fractional changes in relative humidity, not accounted for in the simple scaling, are important over land and high-latitude oceans. An extended scaling that incorporates these gradients is shown to better capture the response of P - E over land, including a smaller increase in global-mean runoffand several regions with decreases in P - E. In the zonal mean over land, the gradient terms lead to a robust drying tendency at almost all latitudes. This drying tendency is shown to relate, in part, to the polar amplification of warming in the Northern Hemisphere, and to the amplified warming over continental interiors and on the eastern side of midlatitude continents. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50535
Appears in Collections: 气候变化事实与影响
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作者单位: ETH Zürich, Zürich, Switzerland; Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Byrne M.P.,O'Gorman P.A.. The response of precipitation minus evapotranspiration to climate warming: Why the "Wet-get-wetter, dry-get-drier" scaling does not hold over land[J]. Journal of Climate,2015-01-01,28(20)