DOI: 10.1002/2017JD027995
Scopus记录号: 2-s2.0-85043319894
论文题名: Winter Precipitation Efficiency of Mountain Ranges in the Colorado Rockies Under Climate Change
作者: Eidhammer T. ; Grubišić V. ; Rasmussen R. ; Ikdea K.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 5 起始页码: 2573
结束页码: 2590
语种: 英语
英文关键词: orographic winter precipitation
; precipitation efficiency
; regional climate change
英文摘要: Orographic precipitation depends on the environmental conditions and the barrier shape. In this study we examine the sensitivity of the precipitation efficiency (i.e., drying ratio (DR)), defined as the ratio of precipitation to incoming water flux, to mountain shape, temperature, stability, and horizontal velocity of the incoming air mass. Furthermore, we explore how the DR of Colorado mountain ranges might change under warmer and moister conditions in the future. For given environmental conditions, we find the DR to be primarily dependent on the upwind slope for mountain ranges wider than about 70 km and on both the slope and width for narrower ranges. Temperature is found to exert an influence on the DR for all Colorado mountain ranges, with DR decreasing with increasing temperature, under both the current and future climate conditions. The decrease of DR with temperature under warmer climate was found to be stronger for wider mountains than the narrower ones. We attribute this asymmetry to the sensitivity of DR to reduced horizontal velocity under warmer conditions. Specifically, while DR for wider mountains shows no sensitivity to changes in horizontal velocity, the DR for narrow ranges increases as the horizontal velocity decreases and more time is provided for precipitation to form. Thus, for narrower ranges, the horizontal velocity appears to offset the temperature effect slightly. The percentagewise decrease of DR for all examined mountain ranges is about 4%K−1. In comparison, the increase in precipitation is about 6%K−1 while the vapor flux increase is about 9%K−1. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114279
Appears in Collections: 气候减缓与适应
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作者单位: National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Eidhammer T.,Grubišić V.,Rasmussen R.,et al. Winter Precipitation Efficiency of Mountain Ranges in the Colorado Rockies Under Climate Change[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(5)