GSTDTAP  > 气候变化
DOI10.1007/s00382-016-3449-0
Non-linear interactions between CO2 radiative and physiological effects on Amazonian evapotranspiration in an Earth system model
Halladay, Kate; Good, Peter
2017-10-01
发表期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2017
卷号49
文章类型Article
语种英语
国家England
英文摘要

We present a detailed analysis of mechanisms underlying the evapotranspiration response to increased CO2 in HadGEM2-ES, focussed on western Amazonia. We use three simulations from CMIP5 in which atmospheric CO2 increases at 1% per year reaching approximately four times pre-industrial levels after 140 years. Using 3-hourly data, we found that evapotranspiration (ET) change was dominated by decreased stomatal conductance (g(s)), and to a lesser extent by decreased canopy water and increased moisture gradient (specific humidity difference between surface and near-surface). There were large, non-linear decreases in ET in the simulation in which radiative and physiological forcings could interact. This non-linearity arises from non-linearity in the conductance term (includes aerodynamic and stomatal resistance and partitioning between the two, which is determined by canopy water availability), the moisture gradient, and negative correlation between these two terms. The conductance term is non-linear because GPP responds non-linearly to temperature and GPP is the dominant control on g(s) in HadGEM2-ES. In addition, canopy water declines, mainly due to increases in potential evaporation, which further decrease the conductance term. The moisture gradient responds non-linearly owing to the non-linear response of temperature to CO2 increases, which increases the Bowen ratio. Moisture gradient increases resulting from ET decline increase ET and thus constitute a negative feedback. This analysis highlights the importance of the g(s) parametrisation in determining the ET response and the potential differences between offline and online simulations owing to feedbacks on ET via the atmosphere, some of which would not occur in an offline simulation.


英文关键词Evapotranspiration Physiological forcing Amazonia CO2 response Earth system model
领域气候变化
收录类别SCI-E
WOS记录号WOS:000410803300014
WOS关键词ENVIRONMENT SIMULATOR JULES ; CLIMATE-CHANGE ; CARBON-DIOXIDE ; FUTURE CHANGES ; LAND-USE ; RESPONSES ; VEGETATION ; IMPACT ; CONDUCTANCE ; HADGEM2-ES
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/36215
专题气候变化
作者单位Met Off Hadley Ctr, FitzRoy Rd, Exeter EX1 3PB, Devon, England
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GB/T 7714
Halladay, Kate,Good, Peter. Non-linear interactions between CO2 radiative and physiological effects on Amazonian evapotranspiration in an Earth system model[J]. CLIMATE DYNAMICS,2017,49.
APA Halladay, Kate,&Good, Peter.(2017).Non-linear interactions between CO2 radiative and physiological effects on Amazonian evapotranspiration in an Earth system model.CLIMATE DYNAMICS,49.
MLA Halladay, Kate,et al."Non-linear interactions between CO2 radiative and physiological effects on Amazonian evapotranspiration in an Earth system model".CLIMATE DYNAMICS 49(2017).
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