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Titel |
Three centuries of winter temperature change on the southeastern Tibetan Plateau and its relationship with the Atlantic Multidecadal Oscillation |
VerfasserIn |
Shiyuan Shi, Jinbao Li, Jiangfeng Shi, Yesi Zhao, Gang Huang |
Konferenz |
EGU General Assembly 2017
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Medientyp |
Artikel
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Sprache |
en
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 19 (2017) |
Datensatznummer |
250147213
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Publikation (Nr.) |
EGU/EGU2017-11338.pdf |
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Zusammenfassung |
Long-term, high-resolution proxy records containing cold season temperature signals are
scarce on the southeastern Tibetan Plateau (TP), limiting our understanding of regional
climate and the potential driving forces. In this study, we present a nearly three
centuries long reconstruction of winter (December–February) mean temperature for
the central Hengduan Mountains, southeastern TP. The reconstruction is derived
from a composite tree-ring width chronology of Pinus yunnanensis Franch from
two high elevation sites (>3000 m above sea level). Our reconstruction passes all
standard calibration-verification schemes and explains nearly 73% of the variance of
the original instrumental data. However, we were constrained to calibrate our full
period (1718–2013) reconstruction of December–February mean temperature on the
calibration period from 1959 to 1992 only, due to a decrease in temperature sensitivity of
tree-ring index exhibited after 1992. Spatial correlation analysis shows that our
reconstruction represents large-scale temperature variations in southwest China and the
eastern TP. Our reconstructed December–February mean temperature shows a close
association with the Atlantic Multidecadal Oscillation (AMO) over the past three
centuries, with warm (cold) periods coinciding with the positive (negative) phases of
the AMO. This persistent relationship suggests that the AMO may have been a
key driver of multidecadal winter temperature variations on the southeastern TP. |
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