气候变化领域集成服务门户(CCPortal): Impact of soil moisture on the dominant modes of North American temperature variability

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DOI	10.1007/s00382-020-05537-3
	Impact of soil moisture on the dominant modes of North American temperature variability
	Diro G.T.; Sushama L.; Scinocca J.; Jiao Y.
发表日期	2021
ISSN	0930-7575
起始页码	1901
结束页码	1916
英文摘要	North American temperature variability and its link with soil moisture is examined in observational/reanalysis datasets and in carefully designed model experiments. The model experiments consist of a control simulation, where soil moisture is allowed to interact (coupled) with the atmosphere at each model time step, and an uncoupled simulation, where soil moisture is prescribed with climatological annual cycle values. Empirical Orthogonal Function analysis reveals that the first three dominant modes of temperature variability, which span synoptic to inter-annual time scales, are very similar in both the observations and the coupled simulation, suggesting that the coupled model successfully reproduces the dominant spatial and temporal patterns of temperature variability. Comparison of the coupled and uncoupled simulations indicates that damping soil moisture variability leads to a clear and robust reduction in temperature variability associated with one of these leading modes, and modest changes to the other two. To explore the underlying feedback processes, the principal component time series of this mode is correlated with the circulation, radiation and turbulent fluxes. This analysis suggests that soil moisture modulates the turbulent fluxes and regional circulation patterns, which in turn modifies the net shortwave radiation pattern to affect the spatio-temporal variability of temperature. Considering the long memory of soil moisture anomalies and the above role it played in modulating one of the leading modes of North Americas temperature variability, the results presented here can have implications for improving sub-seasonal to seasonal temperature forecast skill over North America. © 2021, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Modes of variability; North America; Regional climate model; Soil moisture; Temperature
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183560
作者单位	Department of Civil Engineering and Applied Mechanics and Trottier Institute for Sustainability in Engineering and Design, McGill University, Montreal, QC, Canada; Canadian Meteorological Centre, Environment and Climate Change Canada, 2121 route Transcanadienne, Dorval, QC, Canada; Canadian Centre for Climate Modelling and Analysis, Environment and Climate Change Canada, Victoria, BC, Canada
推荐引用方式 GB/T 7714	Diro G.T.,Sushama L.,Scinocca J.,et al. Impact of soil moisture on the dominant modes of North American temperature variability[J],2021.
APA	Diro G.T.,Sushama L.,Scinocca J.,&Jiao Y..(2021).Impact of soil moisture on the dominant modes of North American temperature variability.Climate Dynamics.
MLA	Diro G.T.,et al."Impact of soil moisture on the dominant modes of North American temperature variability".Climate Dynamics (2021).