HR: 09:45h
AN: A11E-07    [Abstracts]
TI: Seasonal linkage of the Arctic Oscillations and its solar cycle modulation
AU: * Yamazaki, K
EM: yamazaki@ees.hokudai.ac.jp
AF: Graduate School of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo, 060-0810 Japan
AU: Ogi, M
EM: masayo.ogi@jamstec.go.jp
AF: Frontier Research Center for Global Change, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001 Japan
AU: Tachibana, Y
EM: tachi@rh.u-tokai.ac.jp
AF: Liberal Arts Eduaction Center, Tokai University, 1117 Kitakaname, Hiratsuka, 259-1292 Japan
AU: Tachibana, Y
EM: tachi@rh.u-tokai.ac.jp
AF: Institute of Observational Research for Global Change, 3173-25 Showa-machi,, Yokohama, 236-0001 Japan
AB: The winter Arctic Oscillation (AO)/Northern Hemisphere annular mode (NAM) and the subsequent summer AO/NAM, which exhibits a different pattern from the winter AO/NAM, have a significant correlation. The correlation coefficient between the DJF-mean winter-NAM and the JJ-mean summer-NAM index for 44 years (1958-2002) is 0.31, which is significant at a 95% confidence level. This winter-to-summer linkage is modulated by the 11-year solar cycle. In solar maximum years (20 years), the correlation is 0.52, which is significant at a 98% level. On the other hand, in solar minimum years (24 years), it is 0.06 and it is not significant. The winter-to-summer linkage may be brought by the persistent snow anomalies in Eurasia, sea ice anomalies in the Barents Sea, and sea surface temperature anomalies in the North Atlantic. These ocean/land surface anomalies caused by anomalies in winter atmospheric circulation tend to persist through spring only in solar maximum years.
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3362 Stratosphere/troposphere interactions
DE: 3309 Climatology (1620)
DE: 1620 Climate dynamics (3309)
DE: 1650 Solar variability
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting