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DOI	10.1007/s00382-019-04649-9
	Synoptic moisture pathways associated with mean and extreme precipitation over Canada for winter and spring
	Tan X.; Gan T.Y.; Chen Y.D.
发表日期	2019
ISSN	0930-7575
起始页码	2663
结束页码	2681
卷号	53 期号:2020-05-06
英文摘要	Dominant synoptic moisture pathway patterns of vertically integrated water vapor transport (IVT) in winter and spring over Canada West and East were identified using the self-organizing map method. Large-scale meteorological patterns (LSMPs), together with synoptic moisture pathway patterns, were related to the variability in seasonal precipitation totals and occurrences of extreme precipitation events. Changes in both occurrences of LSMPs and seasonal precipitation occurred under those LSMPs were analyzed to explain observed changes in seasonal precipitation totals and occurrences of extreme precipitation events. The effects of large-scale climate anomalies on occurrences of LSMPs were also examined by composite analyses. Results show that synoptic moisture pathways and LSMPs exhibit the propagation of jet streams resulting from the Rossby wave resonance, as the location and direction of ridges and troughs, and the strength and center of pressure lows and highs varied considerably. Even though LSMPs resulting in positive precipitation anomalies are associated with more frequent occurrences of extreme precipitation events than those resulting in negative precipitation anomalies, the patterns featured with anomalously low IVT are sometimes associated with more frequent occurrences of extreme precipitation events. Significant decreases in occurrences of synoptic moisture pathway patterns that are favorable with positive precipitation anomalies and more precipitation extremes in winter over Canada West, and significant decreases in seasonal precipitation and occurrences of precipitation extremes under most synoptic moisture patterns resulted in decreases in seasonal precipitation and the occurrence of extreme precipitation events. LSMPs resulting in a hot and dry (cold and wet) climate and less (more) frequent extreme precipitation events over the Canadian Prairies in winter and northwestern Canada in spring are more likely to occur in years with a negative (positive) phase of PNA. Occurrences of LSMPs for a wet climate and frequent occurrences of extreme precipitation events over southeastern Canada are associated with a positive phase of NAO. In El Niño years or negative PDO years, occurrences of LSMPs tend to associate with a dry climate and less frequent precipitation extremes over western Canada. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Extreme precipitation; Large-scale meteorological patterns; Seasonal precipitation; Self-organizing maps, climate anomalies; Synoptic patterns; Vertically integrated water vapor transport
语种	英语
scopus关键词	anomaly; atmospheric moisture; extreme event; precipitation (climatology); precipitation assessment; seasonal variation; spring (season); synoptic meteorology; water vapor; winter; Canada
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/146070
作者单位	Department of Water Resources and Environment, School of Civil Engineering, Sun Yat-sen University, Guangzhou, 510275, China; Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 2W2, Canada; Department of Geography and Resource Management, Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong
推荐引用方式 GB/T 7714	Tan X.,Gan T.Y.,Chen Y.D.. Synoptic moisture pathways associated with mean and extreme precipitation over Canada for winter and spring[J],2019,53(2020-05-06).
APA	Tan X.,Gan T.Y.,&Chen Y.D..(2019).Synoptic moisture pathways associated with mean and extreme precipitation over Canada for winter and spring.Climate Dynamics,53(2020-05-06).
MLA	Tan X.,et al."Synoptic moisture pathways associated with mean and extreme precipitation over Canada for winter and spring".Climate Dynamics 53.2020-05-06(2019).