| Subject: actually not. |
Author:
sci guy
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Date Posted: 22:41:57 11/25/06 Sat
In reply to:
Duncan7
's message, "Re: poor poor Curmudgeon.." on 06:24:51 11/25/06 Sat
Saw an interview last week. It was a RW spin doctor who came up with the term "climate change" as well as several other nice ways of saying not-so-nice things.
>Aren't you guys the one's that changed it to climate
>change when you figured out the planet may in fact not
>warm, but get colder? 6 of 1 1/2 dozen of another as
>far as i'm concerned..
>
>>You DO realize that th article says that volcanoes
>>COOL the earth, don't you?
>>
>>
>>>Can I get mhy donation back?
>>>
>>>
>>>
>>>>just when we thought we had the weather predictions
>>>>down. a new kink comes in to play. now we have space
>>>>weather, volcanic weather, fire weather, land mass
>>>>change weather.
>>>>
>>>>Volcanic eruptions on Iceland generated a cascade of
>>>>events that led to record low levels of water in the
>>>>Nile River in Africa and brought famine to the
>region
>>>>more than two centuries ago, a new study concludes.
>>>>
>>>>
>>>>
>>>>The findings will inform climate forecasting related
>>>>to future volcanic activity.
>>>>
>>>>
>>>>
>>>>From June 1783 through February 1784, a series of 10
>>>>eruptions from the Laki Craters on this European
>>>>island in the North Atlantic changed atmospheric
>>>>conditions in most of the Northern Hemisphere.
>>>>
>>>>
>>>>
>>>>Unusual temperature and precipitation patterns
>peaked
>>>>in the summer of 1783, causing below normal rainfall
>>>>in most of the Nile drainage basin and therefore
>>>>record low levels in the mighty river for up to one
>>>>year following the eruptions.
>>>>
>>>>
>>>>
>>>>When volcanic eruptions occur, large amounts of
>>sulfur
>>>>dioxide are released into the atmosphere. When this
>>>>gas combines with water vapor, aerosol particles
>>form.
>>>>These particles reflect sunlight back to space and
>>>>therefore cool average temperatures on Earth.
>>>>
>>>>
>>>>
>>>>Researchers used computer models to simulate how
>>>>Iceland’s Laki eruptions affected temperature and
>>>>rainfall levels over the stretch of land from the
>>>>Atlantic ocean to the “horn of Africa,” known as the
>>>>Sahel.
>>>>
>>>>
>>>>
>>>>Simulations showed that the aerosols formed by the
>>>>eruptions cooled average temperatures in the
>Northern
>>>>Hemisphere by up to 5.4 degrees Fahrenheit. Tree
>ring
>>>>data in Alaska and Siberia also showed reduced
>growth
>>>>during the same summer, signifying cooler than
>normal
>>>>weather.
>>>>
>>>>
>>>>
>>>>The abnormally cool temperatures reduced the
>>>>temperature difference between the land masses of
>>>>Africa and Eurasia and their respective water
>masses,
>>>>the Atlantic and Indian oceans. Typically, a sharp
>>>>contrast in temperature between land and sea drives
>>>>roaring monsoon winds. Monsoons are seasonal shifts
>>in
>>>>wind direction that signify the beginning of the
>>rainy
>>>>season.
>>>>
>>>>
>>>>
>>>>The lack of monsoons led to a reduction in cloud
>>cover
>>>>over the Sahel of Africa, southern Arabian Peninsula
>>>>and India that summer. This caused temperatures to
>>>>increase by as much as 3.6 degrees Fahrenheit and
>>>>induced drought in the region. The resulting food
>>>>shortage reduced the population of the Nile Valley
>by
>>>>a sixth.
>>>>
>>>>
>>>>
>>>>"Some of the driest weather occurred over the Nile
>>and
>>>>Niger River watersheds," said lead author Luke Oman,
>>a
>>>>researcher from Rutgers University, NJ. "The
>relative
>>>>lack of cloud cover and increased temperature likely
>>>>amplified evaporation, further lessening water
>>>>available for run-off."
>>>>
>>>>
>>>>
>>>>This dry weather corresponded with record low river
>>>>water levels from 1783 to 1784.
>>>>
>>>>
>>>>
>>>>“These findings may help us improve our predictions
>>of
>>>>climate response following the next strong
>>>>high-latitude eruption, specifically concerning
>>>>changes in temperature and precipitation," Oman
>said.
>>>>"Many societies are very dependent on seasonal
>>>>precipitation for their livelihoods, and these
>>>>predictions may ultimately allow communities time to
>>>>plan for consequences, including impacts on regional
>>>>food and water supplies."
>>>>
>>>>
>>>>href="http://www.livescience.com/environment/061121_
>e
>>r
>>>u
>>>>ptions_nile.html">http://www.livescience.com/environ
>m
>>e
>>>n
>>>>t/061121_eruptions_nile.html
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