Tuesday, September 16, 2008
Chilling Reports on Global Cooling
Global temperatures during the Medieval Warm Period (900-1300 AD) were slightly higher than at present but plunged about 4° in only 20 years, initiating the Little Ice Age that caused severe famines in Europe and leading to the deaths of about one third of the population. Unfortunately, the Medieval Warm Period pre-dated direct observation of sun spots, but for about 100 years (beginning in 1609), sun spots were rare (the Maunder Minimum) and global climate was icy. Virtually all scientists now accept a solar cause of the Little Ice Age. The concern of the Canadian and Russian astrophysicists is that, leading into the coming predictable solar cycle, they are seeing a much lower level of sun spot activity than expected, resembling that which accompanied the plunging global temperatures at the beginning of the Little Ice Age. This is a distinct possibility. However, I think a more likely scenario is that we may be heading for a deeper global cooling than the last one (~1945 to 1977), perhaps similar to the 30-year cool period from 1880 to 1910 when many cold weather records were set.
http://www.redorbit.com/news/science/1553271/scientists_say_antarctic_winter_ice_is_growing/index.html
Scientists Say Antarctic Winter Ice Is Growing
Experts reported on Friday that the amount of sea ice around Antarctica has grown in recent Septembers in what could be an unusual side-effect of global warming.
Since the late 1970s, in the southern hemisphere winter, when emperor penguins huddle together against the biting cold, ice on the sea around Antarctica has been increasing, perhaps because climate change means shifts in winds, sea currents or snowfall.
But Arctic sea ice at the other end of the planet is now close to matching a September 2007 record low at the tail end of the northern summer in a threat to the hunting lifestyles of indigenous peoples and creatures such as polar bears.
"The Antarctic wintertime ice extent increased...at a rate of 0.6 percent per decade" from 1979-2006, said Donald Cavalieri, a senior research scientist at the NASA Goddard Space Flight Center.
He said at 19 million sq kms (7.34 million sq mile), it is still slightly below records from the early 1970s of 20 million. The average year-round ice extent has risen too.
http://news.bbc.co.uk/2/hi/science/nature/7404846.stm
'Fewer hurricanes' as world warms
By Mark Kinver
Science and nature reporter, BBC News
The study suggests hurricanes could become less frequent
Hurricanes and tropical storms will become less frequent by the end of the century as a result of climate change, US researchers have suggested.
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