CGRG Bibliography of Canadian Geomorphology
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Author : Bourlon, E.; and Levac, E.
Date : 2006.
Title : Centennial to millennial Holocene climate oscillations from palynological records in Atlantic Canada.
Publication : Joint Annual Meeting of the Geological Association of Canada and the Mineralogical Association of Canada. University of Quebec in Montreal (UQAM) May 14-17, 2006.
Issue :
Page(s) :
Abstract
Holocene climate knowledge is a key period to understand the climate conditions we experience now and in the near future because it has similar climatic boundary conditions to the actual ones. To understand the nature of Holocene climate variability on centennial through millennial times-scales and to investigate if the large scale oscillations and abrupt changes are important features of this climate, oscillation periods were identified by the wavelet analysis of reconstructed winter and summer sea surface temperatures and salinity from palynological records at LaHave Basin, on the Scotian shelf in Atlantic Canada. Temperature and salinity were obtained using transfer functions on cysts assemblage data. Wavelet method allows the calculation of local spectra even on small data set. It allows the representation of signal on the time-frequency domain. Centennial to millennial oscillations have been recognized and localized in time. Periods of about 900 and 1500 years are clearly present in our four data sets. The 1500-years period probably corresponds to the Dansgaard-Oeschger interstadials. Two others periods of about 2200 and 4100 years were also identified.
Bibliography of Canadian Geomorphology