☆ 4.7 Article

Relationship between North American winter temperature and large-scale atmospheric circulation anomalies and its decadal variation

ENVIRONMENTAL RESEARCH LETTERS (2016)

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Journal

ENVIRONMENTAL RESEARCH LETTERS
Volume 11, Issue 7, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1748-9326/11/7/074001

Keywords

North American temperature variability; atmospheric teleconnection; interannual temperature-circulation relationship; decadal variation

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Environmental Sciences Meteorology & Atmospheric Sciences

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The interannual relationship between North American (NA) winter temperature and large-scale atmospheric circulation anomalies and its decadal variation are analyzed. NA temperature anomalies are dominated by two leading maximum covariance analysis (MCA) modes of NA surface temperature and Northern Hemisphere 500 hPa geopotential anomalies. A new teleconnection index, termed the Asian-Bering-North American (ABNA) pattern, is constructed from the normalized geopotential field after linearly removing the contribution of the Pacific-North American (PNA) pattern. The ABNA pattern is sustained by synoptic eddy forcing. The first MCA mode of NA surface temperature is highly correlated with the PNA and ABNA teleconnections, and the second mode with the North Atlantic Oscillation (NAO). This indicates that NA temperature is largely controlled by these three large-scale atmospheric patterns, i.e., the PNA, ABNA and NAO. These temperature-circulation relationships appear stationary in the 20th century.

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