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Permanent link (DOI): https://doi.org/10.7939/R3TM7215V

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Synoptic Scale Atmospheric Circulation and Summer Drought Variability of the Past Three Centuries, Boreal Canada Open Access

Descriptions

Author or creator
Girardin, M.P.
Tardif, J.C.
Flannigan, M.
Bergeron, Y.
Additional contributors
Subject/Keyword
El-nino
Fire frequency
Sea-surface temperatures
Dendroclimatic reconstruction
Tree-rings
Extended dry spells
North pacific
Interdecadal variability
Southern-oscillation
Pacific decadal variability
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Five independent multicentury reconstructions of the July Canadian Drought Code and one reconstruction of the mean July-August temperature were developed using a network of 120 well-replicated tree-ring chronologies covering the area of the eastern Boreal Plains to the eastern Boreal Shield of Canada. The reconstructions were performed using 54 time-varying reconstruction submodels that explained up to 50% of the regional drought variance during the period of 1919-84. Spatial correlation fields on the six reconstructions revealed that the meridional component of the climate system from central to eastern Canada increased since the mid-nineteenth century. The most obvious change was observed in the decadal scale of variability. Using 500-hPa geopotential height and wind composites, this zonal to meridional transition was interpreted as a response to an amplification of long waves flowing over the eastern North Pacific into boreal Canada, from approximately 1851 to 1940. Composites with NOAA Extended Reconstructed SSTs indicated a coupling between the meridional component and tropical and North Pacific SST for a period covering at least the past 150 yr, supporting previous findings of a summertime global ocean-atmosphere-land surface coupling. This change in the global atmospheric circulation could be a key element toward understanding the observed temporal changes in the Canadian boreal forest fire regimes over the past 150 yr.
Date created
2006
DOI
doi:10.7939/R3TM7215V
License information
Rights
© 2006 American Meteorological Society. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
Girardin, M-P., Tardif, J.C.,Flannigan, M.D. and Bergeron, Y. (2006). Synoptic Scale Atmospheric Circulation and Summer Drought Variability of the Past Three Centuries, Boreal Canada. Journal of Climate, 19, 1922-1947. DOI: 10.1175/JCLI3716.1.
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