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Politics : Foreign Affairs Discussion Group -- Ignore unavailable to you. Want to Upgrade?

To: Wharf Rat who wrote (224120)	3/14/2007 2:51:25 PM
From: Nadine Carroll	Read Replies (1) \| Respond to of 281500

Didn't happen; regional phenomenon Yeah, that's what the last IPCC summary report said. However, there are lots of scientist citing icecores in the Antarctic, Saragasso sea sediments, Chinese agrigultural records, etc, who say different. Chinese agricultural records, like European, indicate that certain plants were growing north of their range today. Abstract The collected documentary records of the cultivation of citrus trees andBoehmeria nivea (a perennial herb) have been used to produce distribution maps of these plants for the eighth, twelfth and thirteenth centuries A.D. The northern boundary of citrus andBoehmeria nivea cultivation in the thirteenth century lay to the north of the modern distribution. During the last 1000 years, the thirteenth-century boundary was the northernmost. This indicates that this was the warmest time in that period. On the basis of knowledge of the climatic conditions required for planting these species, it can be estimated that the annual mean temperature in south Henan Province in the thirteenth century was 0.9–1.0°C higher than at present. A new set of data for the latest snowfall date in Hangzhou from A.D. 1131 to 1264 indicates that this cannot be considered a cold period, as previously believed. An ice core from the eastern Bransfield Basin, Antarctic Peninsula, clearly identifies events of the Little Ice Age and Medieval Warm Period.[14] The core clearly shows a distinctly cold period about AD 1000–1100, neatly illustrating the fact that "MWP" is a moveable term, and that during the "warm" period there were, regionally, periods of both warmth and cold. en.wikipedia.org Was the Medieval Warm Period Global? Wallace S. Broecker During the Medieval Warm Period (800 to 1200 A.D.), the Vikings colonized Greenland. In his Perspective, Broecker discusses whether this warm period was global or regional in extent. He argues that it is the last in a long series of climate fluctuations in the North Atlantic, that it was likely global, and that the present warming should be attributed in part to such an oscillation, upon which the warming due to greenhouse gases is superimposed. sciencemag.org The Little Ice Age and Medieval Warm Period in the Sargasso Sea - "Sea surface temperature (SST), salinity, and flux of terrigenous material oscillated on millennial time scales in the Pleistocene North Atlantic, but there are few records of Holocene variability. Because of high rates of sediment accumulation, Holocene oscillations are well documented in the northern Sargasso Sea. Results from a radiocarbon-dated box core show that SST was ~1 °C cooler than today ~400 years ago (the Little Ice Age) and 1700 years ago, and ~1 °C warmer than today 1000 years ago (the Medieval Warm Period). Thus, at least some of the warming since the Little Ice Age appears to be part of a natural oscillation." (Lloyd D. Keigwin, Science, 274: 1503-1508)