Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. The divergence problem is unprecedented, unique to the last few decades, indicating its cause may be anthropogenic.The cause is likely to be a combination of local and global factors such as warming-induced drought and global dimming.The main conclusion was that ice core dates, in particular those ice cores relied upon the Greenland Ice Core Chronology 2005 ( by a collaboration including Earth scientists, dendrochonologists, and historians, the chronology of the Greenland North Eemian Ice Drilling core (NEEM) has been reassessed and re-dated, confirming that such an offset does indeed exist in the GICC05 timescale below AD 1000.
Because trees are sensitive to local climate conditions, such as rain and temperature, they give scientists some information about that area’s local climate in the past.
For example, tree rings usually grow wider in warm, wet years and they are thinner in years when it is cold and dry.
Be) is formed from high energy collisions with N and O in the atmosphere, and because of its long lifetime and affinity for soluble aerosols, it precipitates out of the atmosphere quickly and can be measured in ice cores.
Therefore, high energy cosmic or solar events should simultaneously create excess Be deposition was apparently offset from trees by 6-7 years, with the ice core chronologies being too old.
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