期刊
CLIMATE OF THE PAST
卷 8, 期 5, 页码 1497-1507出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/cp-8-1497-2012
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资金
- National Nature Science Foundation of China [40972111, 2007105GZ10033]
- Basic Research Program of Jiangsu Province [BK2008025]
The prominent 8.2 ka event was well documented in the Greenland ice cores. It remains unclear, however, about its duration, structure and forcing mechanism at low-to mid-latitude regions. Here we use the physical and geochemical data of stalagmites from the Nuanhe Cave in Liaoning Province, northeastern China, to reconstruct a detailed history of East Asian monsoons covering the entire duration of the event. High-resolution chronologies of two contemporaneous stalagmites, each consisting of at least 770 yr annual growth bands, were established by calibrating and anchoring the floating band-counting ages against five high-precision Th-230 dates. Two oxygen isotope profiles replicate each other on annual-decadal timescales despite their difference in growth rates, indicating that the delta O-18 variability has a climatic origin largely associated with changes in the rainfall delta O-18 from the West Pacific during summer season. A signal from the 8.2ka event was faint in our delta O-18 records, not as significant as Indian monsoon dominated stalagmite delta O-18 records from Qunf in Oman and Dongge in Southern China. However, our delta C-13 and Ba/Ca profiles, as indicators of local environmental changes, provide strong support for a climate reversal centred at 8.2 ka BP, which is likely controlled by winter monsoon circulations via the westerly winds associated with North Atlantic climate. Therefore, we concluded that the winter-and summer-Asian monsoons responded independently to the high northern latitude climate.
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