Preprints
https://doi.org/10.5194/cpd-6-385-2010
https://doi.org/10.5194/cpd-6-385-2010

  07 Apr 2010

07 Apr 2010

Review status: this preprint was under review for the journal CP. A revision for further review has not been submitted.

Last-glacial to postglacial climate formation in the continental interior inferred from multi-proxy records of Lake Hovsgol, Mongolia

K. Minoura1, D. Sugawara1, and T. Kawai2 K. Minoura et al.
  • 1Institute of Geology and Paleontology, Graduate School of Science, Tohoku University, Aramaki 6–3, Aoba-ku, Sendai 980–8578, Japan
  • 2Association of International Research Initiatives for Environmental Studies, Ueno 1-4-4, Taitou-ku, Tokyo 110-0005, Japan

Abstract. Knowledge of the evolution of arboreal forests is necessary to interpret the cause of climate formation in intracontinental regions. Paleoproxy records of sediment cores from Lake Hovsgol, Mongolia show that watershed conditions have fluctuated widely during the last 30 ka because of changing orbital parameters. Termination of glacial cooling and the subsequent prevalence of deglacial warming were consequences of solar forcing. Arboreal forests exerted an important influence on the atmospheric moisture cycle at high latitudes. Air pressure decreased because of raised humidity from water vapor penetration into inland regions that occurred along with summer monsoons. Data showing utilization of solar energy are necessary for establishing climate conditions. Atmospheric warming under increased insolation caused a shift of the monsoon limit to the north, amplifying the summer moisture supply to the watershed. That amplification engendered the appearance of the maximum vegetation in the Hovsgol drainage basin at the beginning of the Holocene. The retreat of arboreal forests that occurred along with decreased solar energy shrank the humidification-vegetation feedback loop, thereby decreasing the atmospheric humidity. The consequently lowered vapor pressure contributed to the incursion of cool air masses from the north.

K. Minoura et al.

 
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

K. Minoura et al.

K. Minoura et al.

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