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GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO. 11, 1549, doi:10.1029/2003GL017250, 2003

Tree-ring reconstructions of temperature and sea-level pressure variability associated with the warm-season Arctic Oscillation since AD 1650

Rosanne D. D'Arrigo

Lamont-Doherty Earth Observatory, Palisades, New York, USA


Edward R. Cook

Lamont-Doherty Earth Observatory, Palisades, New York, USA


Michael E. Mann

University of Virginia, Charlottesville, Virginia, USA


Gordon C. Jacoby

Lamont-Doherty Earth Observatory, Palisades, New York, USA


Abstract

Arctic Oscillation (AO) changes are inferred from a tree-ring reconstruction of a warm-season temperature index. The reconstruction covers AD 1650–1975 and is based largely on chronologies from circumpolar-Arctic and circum-North Atlantic areas. It accounts for 48% of the variance in the instrumental AO record from 1900 to 1975, verifies using independent data, and exhibits its largest variance at low frequencies. Positive levels during 20th century periods equal or exceed values back to AD 1650. Trends (including lower values during ‘Little Ice Age’ periods) resemble those of Arctic temperature reconstructions, reflecting some data overlap, but also the strong link between the AO and northern temperatures. A reconstruction of an AO summer sea level pressure index shows similar trends. Comparison of these reconstructions with proxies of the North Atlantic Oscillation (NAO) and other indices can help clarify relationships between the AO and NAO, at least during the boreal warm season.

Received 4 March 2003; accepted 25 April 2003; published 3 June 2003.

Index Terms: 4221 Oceanography: General: Dendrochronology; 1610 Global Change: Atmosphere (0315, 0325); 1620 Global Change: Climate dynamics (3309); 3344 Meteorology and Atmospheric Dynamics: Paleoclimatology; 9315 Information Related to Geographic Region: Arctic region.

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Citation: D'Arrigo, R. D., E. R. Cook, M. E. Mann, and G. C. Jacoby (2003), Tree-ring reconstructions of temperature and sea-level pressure variability associated with the warm-season Arctic Oscillation since AD 1650, Geophys. Res. Lett., 30(11), 1549, doi:10.1029/2003GL017250.