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.
All four events correlate within error with climate changes in Greenland ice cores.
The decline of monsoon intensity in the mid-late Holocene is characterized by an abrupt positive shift in δO which occurs at 3550±59 yr BP (1.1‰ in ∼100 yr).
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 data are useful in understanding hydrologic variability at local and regional scales, such as the Asian summer monsoon and the Intertropical Convergence Zone (as discussed in the underlying source publications), and should also be useful in understanding large-scale aspects of hydrologic change since the Last Glacial Maximum (LGM). These individual files also contain the chronology information about the sites.Today’s fossil fuel use drives a global climate experiment: how much will global temperatures rise as a result of carbon emissions?
To answer this question, scientists need to understand processes that cause global temperatures to vary in the absence of emissions.
Yet last century's temperatures increased from close to their lowest Holocene values to close to their highest.
Many other studies show that this recent warming results from fossil fuel combustion and industrialization.
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Oxygen isotope measurements from cave deposits provide some of the highest-resolution and best-dated information about past fluctuations in temperature and precipitation.
However, measured temperature records have short histories.