A varve record of increased ‘Little Ice Age’ rainfall associated with volcanic activity, Arctic Archipelago, Canada

Varved sediments from Nicolay Lake, Canadian High Arctic, record major summer rainfall events over the last five centuries. Increased incidences of summer rainfall occurred during the coldest periods of the ‘Little Ice Age’ and were strongly clustered in the years immediately fol...

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Bibliographic Details
Published in:The Holocene
Main Authors: Lamoureux, Scott F., England, John H., Sharp, Martin J., Bush, Andrew B.G.
Format: Article in Journal/Newspaper
Language:English
Published: SAGE Publications 2001
Subjects:
Paleontology
Earth-Surface Processes
Ecology
Archeology
Global and Planetary Change
Arctic
Arctic Ocean
Canada
Fuller
Arctic Archipelago
Online Access:http://dx.doi.org/10.1191/095968301668776315
http://journals.sagepub.com/doi/pdf/10.1191/095968301668776315
Description
Summary:Varved sediments from Nicolay Lake, Canadian High Arctic, record major summer rainfall events over the last five centuries. Increased incidences of summer rainfall occurred during the coldest periods of the ‘Little Ice Age’ and were strongly clustered in the years immediately following major volcanic events. Comparison of the summer rainfall and proxy air temperature records thus provides a fuller understanding of the nature and causes of natural climate variability in the Arctic. Study of the synoptic conditions associated with the two most recent large summer rainfall events suggests that they are associated with the incursion of cold low-pressure systems from the Arctic Ocean Basin. Volcanic activity may produce atmospheric conditions more conducive to the formation of such low-pressure systems, which generate rainfall at low elevations and summer snowfall at higher elevations, thus explaining the correlation between rainfall and summer snow accumulation recorded in ice cores from high-elevation ice caps.

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