Physics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3710704l&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 10, CiteID L10704
Physics
6
Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: Stratosphere/Troposphere Interactions
Scientific paper
During 2009, the Arctic Oscillation (AO) index was exceptionally negative during four months, which was unprecedented in a 60-year record extending back to 1950. The negative phase of the AO corresponded to a nearly zonally symmetric anomaly of temperature and pressure over the middle-to-high latitudes of the Northern Hemisphere. Consistent with the strong negative phase of the AO, below-average temperatures were also observed over North America and parts of Eurasia during June, July, October, and December 2009. Although the impact of the AO on 2-meter temperatures was near zero when averaged over the entire hemisphere (20°-90°N), positive anomalies were evident in the residual pattern of observed temperature. The residual, along with observed below-average stratospheric temperatures, are consistent with anthropogenic climate projections. The possible implication of the recent negative values on the long-term AO trend is also discussed.
Butler Amy
Jha Bhaskar
Kumar Arun
L'Heureux Michelle
Wang Wanqiu
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