HR: 0830h
AN: OS21B-1127    [PDF]
TI: Seasonal variation of the northern hemisphere annular mode and its winter-to-summer linkage
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, Frontier Research Systems for Global Change, Kanazawa-ku, Showa-machi, Yokohama, 236-0001 Japan
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: 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, Frontier Research Systems for Global Change, Kanazawa-ku, Showa-machi, Yokohama, 236-0001 Japan
AB: The seasonal variations of the Northern Hemisphere annular mode (NAM) are examined by applying an empirical orthogonal function (EOF) analysis of the zonally averaged geopotential height fields for each calendar month separately. The summer NAM has a smaller meridional scale compared to the winter mode. In summer, the Arctic action center of the NAM is located over the Arctic Ocean, while in winter it is located over Greenland. The winter NAM affects the following summer atmospheric circulation, and this summer pattern linked to the winter NAM is similar to the summer NAM. The winter-to-summer linkage is interpreted as a preferable transition from one phase of the winter-dominant mode to the same phase of the summer-dominant mode.
DE: 1620 Climate dynamics (3309)
DE: 3309 Climatology (1620)
DE: 3349 Polar meteorology
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting