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[QUOTE]Originally posted by rasol: [QB] [i]The Holocene Climate Optimum warm event consisted of increases of up to 4 °C near the North Pole (in one study, winter warming of 3-9°C and summer of 2-6°C in northern central Siberia. [b]Northwestern Europe experienced warming, while there was cooling in the south.[/b] The average temperature change appears to have declined rapidly with latitude so that essentially [b]no change in mean temperature is reported at low and mid latitudes.[/b] Tropical reefs tend to show temperature increases of less than 1 °C. In terms of the global average, the typical shift was probably between 0.5 and 2 °C warmer than the mid-20th century (depending on estimates of latitude dependence and seasonality in response patterns). In the far southern hemisphere (e.g. New Zealand and Antarctica), the warmest period during the Holocene appears to have been roughly 8,000 to 10,500 years ago, immediately following the end of last ice age By 6,000 years ago, the time normally associated with the Holocene Climatic Optimum in the Northern Hemisphere, these regions had reached temperatures similar to those existing in the modern era, and did not participate in the temperature changes of the North. However, some authors have used the term "Holocene Climatic Optimum" to describe this earlier southern warm period as well. While there [b]do not appear to have been significant temperature changes at most low latitude sites[/b], other climate changes have been reported. Since there is [b]no scientific consensus on how to reconstruct global temperature variations during the Holocene[/b] , the average shown here should be understood as only a rough, quasi-global approximation to the the temperature history of the Holocene[/i] - [URL=http://en.wikipedia.org/wiki/Temperature_record]http://en.wikipedia.org/wiki/Temperature_record[/URL] [/QB][/QUOTE]
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