| Subject: Re: poor poor Curmudgeon.. |
Author:
Duncan7
|
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Date Posted: 06:24:51 11/25/06 Sat
In reply to:
sci guy
's message, "poor poor Curmudgeon.." on 21:34:53 11/24/06 Fri
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/environm
>e
>>n
>>>t/061121_eruptions_nile.html
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