A high resolution absolute dating holocene and deglacial asian


15-Feb-2017 11:43

O record characterizes orbital- to decadal-scale variability of Asian summer monsoon (ASM) intensity, with the Holocene optimum period (HOP) between 9.8 and 6.8 ka BP which is reinforced by its co-varying δO indicates its high sensitivity to climate change.

Four centennial-scale weak ASM events during the early Holocene are centered at 11.2, 10.8, 9.1 and 8.2 ka.

The association between solar activity and Asian monsoon (AM) remains unclear.

Here we evaluate the possible connection between them based on a precisely-dated, high-resolution speleothem oxygen isotope record from Dongge Cave, southwest China during the past 4.2 thousand years (ka).

Using data contributed to the World Data Center (WDC) for Paleoclimatology, we have created consistently formatted data files for individual sites as well as composite dataset of annual to millennial resolution.

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Our result has further indicated a better correlation between our calcite δ.A good correlation between the monsoon and solar activity was often obtained by adjusting the chronologies of monsoon proxies to solar signals (e.g., cosmogenic nuclides) at decadal to centennial timescales O data.The inconsistence among the cave records may be due to different flow-through times, mixing-up conditions in the epi-karst, and other contingent factors.O events centered at 11225±97 yr BP (1.05‰), 10880±117 yr BP (1.15‰), 9165±75 yr BP (1.4‰), and a double event centered at 8260±64 yr BP (1.1‰) and 8080±74 yr BP (1.0‰) punctuated this period of high monsoon intensity.

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All four events correlate within error with climate changes in Greenland ice cores.Today’s fossil fuel use drives a global climate experiment: how much will global temperatures rise as a result of carbon emissions?



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