Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
14 Jul 2009
Review status
This discussion paper is a preprint. It has been under review for the journal Climate of the Past (CP). The revised manuscript was not accepted.
Paleometeorology: visualizing mid-latitude dynamics at the synoptic level during the Last Glacial Maximum
M. B. Unterman1, T. J. Crowley1, K. I. Hodges2, S. J. Kim3, and D. J. Erickson4 1Grant Institute, School of Geosciences, University of Edinburgh, Edinburgh, UK
2Environmental Systems Science Centre, University of Reading, Reading, UK
3Korea Polar Research Institute KORDI, Incheon, Korea
4Center for Computational Sciences, Oak Ridge National Labs, Tennessee, USA
Abstract. High resolution animations of the ice age surface have been developed as a tool for in-depth analysis of "paleometeorological" features. Synoptic-scale weather conditions of the Last Glacial Maximum (LGM) are simulated using the National Center for Atmospheric Research (NCAR) Community Climate Model version 3 (CCM3.6) on a globally resolved T170 (~75 km) grid domain. Model outputs have been saved at hourly intervals in order to better resolve diurnal features. The simulation has been run in tandem with a lower temporally resolved simulation of Kim et al. (2008) to enable a first-pass assessment of significance of features in the shorter run. Both simulations were forced with modified CLIMAP sea ice and sea surface temperatures (SSTs), reduced global CO2, ice sheet topography, lower sea level, and 21 000 BP orbital parameters. Results from the North Pacific show continued high storm activity during the LGM, whereas the North Atlantic tends to be more quiescent. Plots of storm tracks indicate that all North Pacific storms were steered northward into the Gulf of Alaska, bringing relatively warm air and precipitation into the region. This result is consistent with increased poleward heat transport into the region in the LGM climatological run as well as the absence of evidence for glaciation in middle Alaska. Storm-track trajectories should also have decreased upwelling along the northwest American coast – a response consistent with some geological data. The storms and other atmospheric features are illustrated in a high-resolution animation, which may also be useful as a teaching tool. Further investigation of these runs may provide additional insight into features such as wave-wave interactions, which have previously been unavailable to the research community for an alternate-Earth climate that has been at least as common as the present one over the last 500 000 years.

Citation: Unterman, M. B., Crowley, T. J., Hodges, K. I., Kim, S. J., and Erickson, D. J.: Paleometeorology: visualizing mid-latitude dynamics at the synoptic level during the Last Glacial Maximum, Clim. Past Discuss.,, 2009.
M. B. Unterman et al.
M. B. Unterman et al.


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