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A longer climate memory carried by soil freeze-thaw processes in Siberia

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Title: A longer climate memory carried by soil freeze-thaw processes in Siberia
Authors: Matsumura, Shinji Browse this author
Yamazaki, Koji Browse this author →KAKEN DB
Keywords: climate memory
soil freeze-thaw processes
permafrost
Issue Date: Oct-2012
Publisher: IOP Publishing
Journal Title: Environmental Research Letters
Volume: 7
Issue: 4
Start Page: 045402
Publisher DOI: 10.1088/1748-9326/7/4/045402
Abstract: The climate memory of a land surface generally persists for only a few months, but analysis of surface meteorological data revealed a longer-term climate memory carried by soil freeze-thaw processes in Siberia. Surface temperature variability during the snowmelt season corresponds reasonably well with that in the summer of the following year, when most stations show a secondary autocorrelation peak. The surface temperature memory is thought to be stored as variations in the amount of snowmelt water held in the soil, and through soil freezing, which emerges as latent heat variations in the near-surface atmosphere during soil thawing approximately one year later. The ground conditions are dry in the longer-term climate memory regions, such as eastern Siberia, where less snow cover (higher surface air temperature) in spring results in less snowmelt water or lower soil moisture in the summer. Consequently, through soil freezing, it will require less latent heat to thaw in the summer of the following year, resulting in higher surface air temperature. In addition to soil moisture and snow cover, soil freeze-thaw processes can also act as agents of climate memory in the near-surface atmosphere.
Rights: http://creativecommons.org/licenses/by/3.0/
Type: article
URI: http://hdl.handle.net/2115/51785
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山崎 孝治

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