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Arctic Oscillation during the mid-Holocene and lastglacial maximum from PMIP2 coupled model simulations

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Title
Arctic Oscillation during the mid-Holocene and lastglacial maximum from PMIP2 coupled model simulations
Other Titles
고기후모형 비교프로그램자료를 이용한 홀로세중기와 마지막최대빙하기의 북극진동연구
Authors
Ayako Abe-Ouchi
Yongqiang Yu
Junmei Lu
Kim, Seong-Joong
Keywords
Arctic Oscillation; PMIP2; climate model; last glacial maximum; mid-Holocene
Issue Date
2009
Citation
Ayako Abe-Ouchi, et al. 2009. Arctic Oscillation during the mid-Holocene and lastglacial maximum from PMIP2 coupled model simulations. American Geophysical Union (AGU). American Geophysical Union (AGU). 2009.12.14~.
Abstract
Changes in the Arctic oscillation (AO) during the mid-Holocene and the last glacial maximum were compared to pre-industrial simulations using four coupled ocean-atmosphere models (i.e. CCSM, HadCM3M2, IPSL, and MIROC3.2) from the second phase of Paleoclimate Modeling Intercomparison Project. Results show that the amplitude of the simulated AO during the mid-Holocene is a little smaller than that of the pre-industrial simulation. While the AO pattern and vertical structures are similar to those in the pre-industrial simulation, the polar westerlies are slightly weakened and displaced downward to the lower stratosphere, accompanied by weakening of the polar vortex and warming of the cold polar cap region. During the last glacial maximum, when the Northern Hemisphere experiences severe cooling, the intensity of the AO decreases substantially compared to the mid-Holocene, with smaller standard deviation of the AO index in all models. Furthermore, both the magnitude of positive and negative centers of the AO spatial pattern decrease, and the strength of the polar vortex and westerlies weaken further with the center of westerlies displaced into the mid-latitude upper troposphere. The polar cap region becomes slightly warm in the stratosphere, while it remains cold in the troposphere. The AO appears to be sensitive to background climate state.
URI
http://repository.kopri.re.kr/handle/201206/7977
Conference Name
American Geophysical Union (AGU)
Conference Place
American Geophysical Union (AGU)
Conference Date
2009.12.14~
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