GSTDTAP  > 气候变化
DOI10.1002/2016JD025855
Historic and projected changes in vapor pressure deficit suggest a continental-scale drying of the United States atmosphere
Ficklin, Darren L.1; Novick, Kimberly A.2
2017-02-27
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2017
卷号122期号:4
文章类型Article
语种英语
国家USA
英文摘要

Via air temperature increases and relative humidity changes, climate change will modify vapor pressure deficit (VPD), which is an important determinant of water vapor and CO2 exchange between the land surface and atmosphere. VPD is the difference between the water vapor the air can hold at saturation (e(s)) and the actual amount of water vapor (e(a)). Here we assess changes in VPD, e(s), and e(a) in the United States (U.S.) for the recent past (1979-2013) and the future (2065-2099) using gridded, observed climate data and output from general circulation models. Historically, VPD has increased for all seasons, driven by increases in e(s) and declines in e(a). The spring, summer, and fall seasons exhibited the largest areal extent of significant increases in VPD, which was largely concentrated in the western and southern portions of the U.S. The changes in VPD stemmed from recent air temperature increases and relative humidity decreases. Projections indicate similar, amplified patterns into the future. For the summer, the general circulation model ensemble median showed a 51% projected increase (quartile range of 39 and 64%) in summer VPD for the U.S., reflecting temperature-driven increases in e(s) but decreases or minimal changes in relative humidity that promotes negligible changes in e(a). Using a simple model for plant hydraulic functioning, we also show that in the absence of stomatal acclimation, future changes in VPD can reduce stomatal conductance by 9-51%, which is a magnitude comparable to the expected decline in stomatal conductance from rising CO2.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000396121200001
WOS关键词HYDROLOGICALLY BASED DATASET ; LAND-SURFACE FLUXES ; STOMATAL CONDUCTANCE ; TEMPERATURE TRENDS ; WATER TRANSPORT ; MOISTURE DEMAND ; BIAS CORRECTION ; TREE MORTALITY ; CLIMATE-CHANGE ; PRECIPITATION
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/33572
专题气候变化
作者单位1.Indiana Univ, Dept Geog, Bloomington, IN 47405 USA;
2.Indiana Univ, Sch Publ & Environm Affairs, Bloomington, IN USA
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Ficklin, Darren L.,Novick, Kimberly A.. Historic and projected changes in vapor pressure deficit suggest a continental-scale drying of the United States atmosphere[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(4).
APA Ficklin, Darren L.,&Novick, Kimberly A..(2017).Historic and projected changes in vapor pressure deficit suggest a continental-scale drying of the United States atmosphere.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(4).
MLA Ficklin, Darren L.,et al."Historic and projected changes in vapor pressure deficit suggest a continental-scale drying of the United States atmosphere".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.4(2017).
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