Kirata -> RE: Warming ocean could melt ice faster than thought (7/4/2011 12:14:30 PM)
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Everything I've been able to find so far indicates that warming oceans are not the issue. The issue is changes in ocean currents, which even without the oceans being any warmer would cause increased melting. In Antarctia, for example: “The main reason the glaciers are thinning in this region, we think, is the presence of warm waters,” he said. “Warm waters did not get there because the ocean warmed up, but because of subtle changes in ocean circulation. Ocean circulation is key. This study reinforces this concept.” ~The Earth Institute, Columbia University The biggest concern is that this may be signalling the onset of a period of global cooling. The thawing of sea ice covering the Arctic could disturb or even halt large currents in the Atlantic Ocean. Without the vast heat that these ocean currents deliver... Europe's average temperature would likely drop 5 to 10°C (9 to 18°F), and parts of eastern North America would be chilled somewhat less. Such a dip in temperature would be similar to global average temperatures toward the end of the last ice age roughly 20,000 years ago. ~NASA Science News Nor is it at all clear that there is an anthropogenic cause behind these changes. In fact, such cyclic changes are the norm. [image]http://www.wunderground.com/education/GISPIItemp.gif[/image] The historical records shows us that abrupt climate change is not only possible--it is the normal state of affairs. The present warm, stable climate is a rare anomaly. ~Weather Underground Sudden warmings and coolings of 15°F (8°C) or more are typical for the past 100,000 years. The most unusual feature in the record is the past ~11,000 years of stable climate. K.
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