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Climate Dynamics

, Volume 52, Issue 5–6, pp 2959–2979 | Cite as

Synoptic moisture pathways associated with mean and extreme precipitation over Canada for summer and fall

  • Xuezhi TanEmail author
  • Thian Yew Gan
  • Yongqin David Chen
Article
  • 139 Downloads

Abstract

Large-scale meteorological patterns (LSMPs), especially vertically integrated water vapor transport (IVT) patterns were identified using the self-organizing map algorithm, and LSMPs were related to seasonal precipitation totals and widespread precipitation extremes for summer and fall seasons over Canada West and East, using the JRA-55 reanalysis and the ANUSPLIN precipitation dataset (1958–2013). Changes in the frequency of occurrences, persistence and maximum duration of each LSMP were detected. Trends in seasonal precipitation totals and extreme precipitation events associated with each LSMP were also detected. Our results show that synoptic settings of precipitation that have occurred over Canada exhibit a variety of spatial clusters of IVT anomalies, pressure highs and lows, troughs and ridges over North America, North Pacific, North Atlantic and Arctic. Extremely high IVT magnitude anomaly (|IVT|′) over central Canada West are associated with the Aleutian low and Gulf cyclone across Canada West and Alaska, which force moisture from North Pacific to Canada West. Widespread positive |IVT|′ over Canada East are related to a strengthened and southwest-shifted trough across Canada East. Annually, only 19.4% of the occurrence characteristics of LSMPs show statistically significant changes. More statistically significant changes in the daily precipitation and occurrences of extreme precipitation related to each LSMP, than changes in the occurrence of LSMPs, have resulted in changes to seasonal precipitation totals and the occurrence of extreme precipitation across Canada. LSMPs associated with a dry climate and less frequent extreme precipitation events over Canada West in summer and fall tend to occur during the negative phase of PNA. LSMPs associated with a wet climate and frequent occurrence of extreme precipitation events over the south (north) of Canada East are more likely to occur during the positive (negative) phase of NAO.

Keywords

Vertically integrated water vapor transport Synoptic patterns Large-scale meteorological patterns Seasonal precipitation Extreme precipitation Self-organizing maps, climate anomalies 

Notes

Acknowledgements

The first author was partly funded by the China Scholarship Council (CSC) of P. R. China and the University of Alberta. We are grateful to Dan McKenney and Pia Papadopol from the Natural Resources Canada for providing the ANUSPLIN Canadian precipitation data used in this study. All analyses were conducted using the R language and figures were plotted using NCL language. The SOM algorithm was implemented in the kohonen package (Wehrens and Buydens 2007). The JRA-55 reanalysis for geopotential heights and IVT were downloaded from http://rda.ucar.edu/datasets/ds628.0/ Monthly values of the multivariate ENSO index (MEI) (Wolter and Timlin 2011) and the PDO index, and daily values of PNA, NAO and AO indices were obtained from the National Oceanic and Atmospheric Administration (NOAA) Climate Prediction Center.

Supplementary material

382_2018_4300_MOESM1_ESM.docx (209 kb)
Supplementary material 1 (DOCX 209 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Water Resources and EnvironmentSun Yat-sen UniversityGuangzhouPeople’s Republic of China
  2. 2.Department of Civil and Environmental EngineeringUniversity of AlbertaEdmontonCanada
  3. 3.Department of Geography and Resource Management, and Institute of Environment, Energy and SustainabilityThe Chinese University of Hong KongHong KongHong Kong

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