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      Teleconnections between ENSO events and growing season precipitation on the Canadian Prairies

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      nq24052.pdf (9.622Mb)
      Date
      1995-12-01
      Author
      Bonsal, Barrie Richard
      Type
      Thesis
      Degree Level
      Doctoral
      Metadata
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      Abstract
      Teleconnections between ENSO events and growing-season precipitation variations on the Canadian Prairies are examined. Correlation and composite analyses indicate that between 1948 and 1991, El Nino events were associated with more frequent extended dry spells. Conversely, La Nina events coincided with fewer extended dry spells. Both relationships occurred during the third growing season following the onset of the ENSO events (i.e. approximately a 10-season or 30-month lag). A series of atmosphere - ocean teleconnections over the Pacific Ocean including Pacific North America (PNA) circulation patterns, North Pacific sea-surface temperature anomalies and upper-atmospheric circulation anomalies were found to result in growing-season precipitation variations over the Canadian Prairies. Results of this analysis are incorporated into a conceptual model which may form the basis of a long-range forecasting technique of growing-season precipitation variations on the Canadian Prairies.
      Degree
      Doctor of Philosophy (Ph.D.)
      Department
      Geography
      Program
      Geography
      Committee
      Martz, Lawrence W.
      Copyright Date
      December 1995
      URI
      http://hdl.handle.net/10388/etd-10202004-235852
      Subject
      Rainfall
      ENSO events
      Canadian prairies - weather patterns
      El Niño/Southern Oscillation
      Precipitation
      Climatology
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