HR: 1340h
AN: PP13C-1419    [Abstracts]
TI: The 1,500-year climate oscillation in the mid-latitude North Pacific during the Holocene
AU: Isono, D
EM: myama@ees.hokudai.ac.jp
AF: Faculty of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo, 060-0810, Japan
AU: * Yamamoto, M
EM: myama@ees.hokudai.ac.jp
AF: Faculty of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo, 060-0810, Japan
AU: Irino, T
EM: irino@ees.hokudai.ac.jp
AF: Faculty of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo, 060-0810, Japan
AU: Oba, T
EM: oba-tad@ees.hokudai.ac.jp
AF: Faculty of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo, 060-0810, Japan
AU: Murayama, M
EM: murayama@cc.kochi-u.ac.jp
AF: CAMCR, Kochi University, Monobe 200, Nankoku, 783-8502, Japan
AU: Nakamura, T
EM: nakamura@nendai.nagoya-u.ac.jp
AF: ORI, University of Tokyo, Minamidai 1-15-1, Nakano-ku, Tokyo, 164-8639, Japan
AU: Kawahata, H
EM: kawahata@ori.u-tokyo.ac.jp
AF: Nagoya University Center for Chronological Research, Furocho Chikusa-ku, Nagoya, 464- 8602, Japan
AB: Suborbital climate variability during the last glacial period was characterized by a periodicity of 1,470 years, but the expression and spatial distribution of the ~1,500-year oscillation during interglacials are not clear. Here we generated a multi-decade-resolution record of alkenone sea-surface temperatures (summer SST) off central Japan in the northwestern Pacific during the Holocene. The SST record showed centennial and millennial variability with an amplitude of ~1°C through the entire Holocene. Spectral analysis shows that SST variation was expressed in 1560-, 880- and 620-year periods, and the ~1,500 year periodicity was the most pronounced. The SST minima correlate with reduced North Atlantic Deep Water formation events (Bond events) and with SST maxima at the California margin. These findings indicate that the mean latitude of the Northern Westerly and the intensity of the North Pacific High varied through a 1,500-year cycle, and that a climatic link existed between the mid-latitude North Pacific and the high-latitude North Atlantic. The regular pacing at 1,500- year intervals through both the Holocene and the last glacial suggests that the oscillation was a response to external forcing rather than an internal oscillation in the climate system.
DE: 1055 Organic and biogenic geochemistry
DE: 4901 Abrupt/rapid climate change (1605)
DE: 4938 Interhemispheric phasing
DE: 4954 Sea surface temperature
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting