Climate of the Past
www.clim-past.net
1814-9324
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3
3
2007
10.5194/cp-3-439-2007
http://www.clim-past.net/3/439/2007/
http://www.clim-past.net/3/439/2007/cp-3-439-2007.html
http://www.clim-past.net/3/439/2007/cp-3-439-2007.pdf
439
451
2007-07-23
The LGM surface climate and atmospheric circulation over East Asia and the North Pacific in the PMIP2 coupled model simulations
W. Yanase
yanase@ccsr.u-tokyo.ac.jp
A. Abe-Ouchi
Center for Climate System Research, The University of Tokyo, Tokyo, Japan
Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
The surface conditions and atmospheric circulation
over East Asia and the North Pacific
during the last glacial maximum have been investigated
using outputs from several coupled atmosphere-ocean
general circulation model in the PMIP2 database.
During the boreal summer,
the weakening of the high pressure system over the North Pacific
and less precipitation over East Asia are found in most models.
The latter can be attributed to reduced moisture transport.
During the boreal winter, an intensification of the Aleutian low
and southward shift of the westerly jet stream in the upper troposphere
are found in most models.
<br><br>
Some of the results in the present study seem to be consistent
with the paleoclimatic reconstructions in the previous studies:
pollen and lake-status records suggest dry climate over East Asia
during the last glacial maximum, and part of the dust record has a signal
that the East Asian winter monsoon was more strong and
the westerly jet stream in the upper troposphere
was further south during the last glacial maximum than at the present day.
This result confirms that a coupled atmosphere-ocean general circulation model
is a promising tool to understand not only the global climate
but also the regional climate in the past.
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