Atmospheric circulation influences on seasonal precipitation patterns in Alaska during the latter 20th century

Michelle L. L'Heureux, Michael Mann, Benjamin I. Cook, Byron E. Gleason, Russell S. Vose

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

A set of long, nearly complete daily precipitation series for Alaska spanning the latter half of the 20th century has been analyzed for seasonal relationships between variations in mean, heavy, and extreme precipitation and large-scale atmospheric circulation variations at interannual, decadal, and secular timescales. Relationships with four candidate predictors (the Pacific North American (PNA), Arctic Oscillation (AO), Pacific Decadal Oscillation (PDO), and Nino3 indices) are used for insights into possible large-scale climate forcing. Winter precipitation (mean and extreme) variability and trends along the south coast and interior of Alaska appear to be closely related to variations in the PNA pattern over this timeframe, while El Nino/Southern Oscillation (ENSO) influences, through the Nino3 index, appear to be significant along the south coast alone. Along the south coast the PNA and ENSO exert opposing influences on extreme (and mean) precipitation. Within interior Alaska the positive PNA pattern tends to suppress precipitation owing to orographic factors. Summer variations appear more closely related to the influence of the AO and PDO. The north slope region of Alaska appears to be too far removed from the influences of any of the examined predictors for any clear relationship to be evident.

Original languageEnglish (US)
JournalJournal of Geophysical Research D: Atmospheres
Volume109
Issue number6
StatePublished - Mar 27 2004

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atmospheric circulation
Coastal zones
oscillation
Arctic Oscillation
Pacific Decadal Oscillation
El Nino-Southern Oscillation
coasts
coast
El Nino
Southern Oscillation
oscillations
el Nino
Arctic region
climate forcing
timescale
predictions
winter
climate
summer
slopes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

L'Heureux, Michelle L. ; Mann, Michael ; Cook, Benjamin I. ; Gleason, Byron E. ; Vose, Russell S. / Atmospheric circulation influences on seasonal precipitation patterns in Alaska during the latter 20th century. In: Journal of Geophysical Research D: Atmospheres. 2004 ; Vol. 109, No. 6.
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Atmospheric circulation influences on seasonal precipitation patterns in Alaska during the latter 20th century. / L'Heureux, Michelle L.; Mann, Michael; Cook, Benjamin I.; Gleason, Byron E.; Vose, Russell S.

In: Journal of Geophysical Research D: Atmospheres, Vol. 109, No. 6, 27.03.2004.

Research output: Contribution to journalArticle

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