|Cyclic rapid warming on centennial-scale revealed by a 2650-year stalagmite record of warm season temperature|
Figure 3. 2650-year (BC665-AD1985) WTR spliced with Beijing instrumental data from 1930-2000. Solid red line is reconstructed MJJA temperature. Dark blue dashed line is errors. Pink dashed line is observed MJJA data. The 101-year low-pass filter (green solid line) shows centennial-scale variation. The zero line (light blue dashed) corresponds to the overall mean of the reconstructed series. Thick and long arrows with capital letters W and C point out the "absolute" warm peaks (upward) and cool troughs (downward), respectively, at which temperature exceeds the average. Thin and short arrows with small letter w and c point out the "relative" warm peaks and cool troughs, respectively, at which temperature doesn't exceed the average.
Cyclic rapid warming on centennial-scale revealed by a 2650-year stalagmite record of warm season temperature
Geophysical Research Letters
Vol. 30, No. 12, 1617 (June 2003).
Ming Tan and Tungsheng Liu
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Shaanxi, China
Juzhi Hou and Xiaoguang Qin
| ABSTRACT: |
|A 2650-year (BC665-AD1985) warm season (MJJA: May, June, July, August) temperature reconstruction is derived from a correlation between thickness variations in annual layers of a stalagmite from Shihua Cave, Beijing, China and instrumental meteorological records. Observations of soil CO2 and drip water suggest that the temperature signal is amplified by the soil-organism-CO2 system and recorded by the annual layer series. Our reconstruction reveals that centennial-scale rapid warming occurred repeatedly following multicentennial cooling trends during the last millennia. These results correlate with different records from the Northern Hemisphere, indicating that the periodic alternation between cool and warm periods on a sub-millennial scale had a sub-hemispherical influence.|
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Stalagmite layer thickness and warm season temperature reconstruction
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It was published in Geophysical Research Letters Vol. 30, No. 12, 1617 (June 2003)
This work was supported by the National Scientific Foundation of China (grants 49894170 and 40072098), the Chinese Ministry of Science and Technology (grant G1999043402) and the Chinese Academy of Sciences (grants KZCX2-SW-118 and KZCX3-SW-120).
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8 August 2003