HR: 0830h
AN: OS21B-1126    [PDF]
TI: Impact of the Wintertime NAO on the Summertime Atmospheric Circulation and its Solar Cycle Modulation
AU: * Ogi, M
EM: ogi@ees.hokudai.ac.jp
AF: Graduate School of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Sapporo, 060-0810 Japan
AU: Yamazaki, K
EM: yamazaki@ees.hokudai.ac.jp
AF: Graduate School of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Sapporo, 060-0810 Japan
AU: Yamazaki, K
EM: yamazaki@ees.hokudai.ac.jp
AF: IARC, FRSGC, Kanazawa-ku, Showa-machi, Yokohama, 236-0001 Japan
AU: Tachibana, Y
EM: tachi@rh.u-tokai.ac.jp
AF: Liberal Arts Education Center, Tokai University, Kitakaname 1117, Hiratsuka, 259-1292 Japan
AU: Tachibana, Y
EM: tachi@rh.u-tokai.ac.jp
AF: IARC, FRSGC, Kanazawa-ku, Showa-machi, Yokohama, 236-0001 Japan
AB: The summer high-latitude climate in the Northern Hemisphere is influenced by the NAO of the previous winter. We find this influence in the summertime surface air temperature, the geopotential height, the sea surface temperature (SST), sea-ice/continental snow cover extent fields as well as in the zonal mean geopotential height and zonal wind fields. This summertime NAO signal is annular but its meridional scale is much smaller than the winter annular mode. We suggest that the sea-ice, SST and snow cover anomalies provide the memory allowing the winter NAO to affect the summer climate. In addition, the 11-year solar cycle modulation of the winter-to-summer linkage is examined. During the solar maximum years, the winter NAO has a significant relation with the spring-summer climate, while the linkage is very weak during the solar minimum years. During the solar maximum years, the winter NAO affects spring snow cover over the Eurasian continent and sea ice over the Barents Sea.
DE: 1620 Climate dynamics (3309)
DE: 1863 Snow and ice (1827)
DE: 3309 Climatology (1620)
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting