DOI: 10.1007/s00382-013-1829-2
Scopus记录号: 2-s2.0-84894353791
论文题名: Transient twenty-first century changes in daily-scale temperature extremes in the United States
作者: Scherer M. ; Diffenbaugh N.S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-05-06 起始页码: 1383
结束页码: 1404
语种: 英语
英文关键词: Cold extreme
; Hot extreme
; RegCM3
; Regional climate model
; Time of emergence (TOE)
; Transient change
英文摘要: A key question for climate mitigation and adaptation decisions is how quickly significant changes in temperature extremes will emerge as greenhouse gas concentrations increase, and whether that emergence will be uniform between hot and cold extremes and across different geographic areas. We use a high-resolution, multi-member ensemble climate model experiment over the United States (U.S.) to investigate the transient response of the annual frequency, duration and magnitude of 8 daily-scale extreme temperature indices during the twenty-first century of the A1B emissions scenario. We evaluate the time of emergence of a permanent exceedance (PE) above the colder part of the historical (1980-2009) extremes distribution, and the time of emergence of a new norm (NN) centered on the historical maxima (for hot extremes) or minima (for cold extremes). We find that during the twenty-first century, hot extremes permanently exceed the historical distribution's colder half over large areas of the U.S., and that the hot extremes distribution also becomes centered on or above the historical distribution's maxima. The changes are particularly robust for the exceedance of the annual 95th percentile of daily maximum temperature over the West and the Northeast (with the earliest emergence of a PE by 2030 and of a NN by 2040), for warm days over the Southwest (with the earliest emergence of a PE by 2020 and of a NN by 2030), and tropical nights over the eastern U.S. (with the earliest emergence of a PE by 2020 and of a NN by 2030). Conversely, no widespread emergence of a PE or a NN is found for most cold extremes. Exceptions include frost day frequency (with a widespread emergence of a PE below the historical median frequency by 2030 and of a NN by 2040 over the western U.S.), and cold night frequency (with an emergence of a PE below the historical median frequency by 2040 and of a NN by 2060 in virtually the entire U.S.). Our analysis implies a transition over the next half century to a climate of recently unprecedented heat stress in many parts of the U.S., along with cold extremes that, although less frequent, remain at times as long and as severe as are found in the current climate. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54279
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Environmental Earth System Science, Woods Institute for the Environment, Stanford University, 473 Via Ortega, Stanford, CA, 94305-4216, United States; Department of Earth and Atmospheric Sciences, Purdue Climate Change Research Center, Purdue University, West Lafayette, IN, United States
Recommended Citation:
Scherer M.,Diffenbaugh N.S.. Transient twenty-first century changes in daily-scale temperature extremes in the United States[J]. Climate Dynamics,2014-01-01,42(2017-05-06)