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| Titel |
Millennial minimum temperature variations in the Qilian Mountains, China: evidence from tree rings |
| VerfasserIn |
Y. Zhang, X. M. Shao, Z.-Y. Yin, Y. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 5 ; Nr. 10, no. 5 (2014-09-24), S.1763-1778 |
| Datensatznummer |
250117054
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| Publikation (Nr.) |
 copernicus.org/cp-10-1763-2014.pdf |
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| Zusammenfassung |
| A 1343-year tree-ring chronology was developed from Qilian junipers in the
central Qilian Mountains of the northeastern Tibetan Plateau (TP), China. The
climatic implications of this chronology were investigated using simple
correlation, partial correlation and response function analyses. The
chronology was significantly positively correlated with temperature variables
prior to and during the growing season, especially with monthly minimum
temperature. Minimum temperature anomalies from January to August since AD
670 were then reconstructed based on the tree-ring chronology. The
reconstruction explained 58% of the variance in the instrumental
temperature records during the calibration period (1960–2012) and captured
the variation patterns in minimum temperature at the annual to centennial
timescales over the past millennium. The most recent 50 years were the
warmest period, while 1690–1880 was the coldest period since AD 670.
Comparisons with other temperature series from neighbouring regions and for
the Northern Hemisphere as a whole supported the validity of our
reconstruction and suggested that it provided a good regional representation
of temperature change in the northeastern Tibetan Plateau. The results of
wavelet analysis showed the occurrence of significant quasi-periodic patterns
at a number of recurring periods (2–4, 40–50, and 90–170 years), which
were consistent with those associated with El Niño–Southern Oscillation
(ENSO), Pacific Decadal Oscillation (PDO) and solar activity. The comparison
between the reconstructed temperature and the index of tropical volcanic
radiative forcing indicated that some cold events recorded by tree rings may
be due to the impact of tropical volcanic eruptions. |
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