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Subject: since when is northern africa the whole world? Author: sci guy [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 14:30:14 11/27/06 Mon In reply to: c 's message, "Better than you Queenie. The volcanic eruptions also reduced" on 07:03:38 11/27/06 Mon I love when your side points to a local phenomenom and claims it's global.... "It's snowing here, therefore GW doesn't exist!" What a load of crap. >monsoons, INCREASING temperatures in northern Africa. > >"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 and induced drought in the >region. The resulting food shortage reduced the >population of the Nile Valley by a sixth." > > > > > > > > > > >> >>Try reading the WHOLE article you link to... >> >>(did youeven BOTHER to read teh headline?) >> >>The changes wrought by Pinatubo's sulfuric acid >>cloud, which blocked a large percentage of sunlight >>from reaching the earth, initially included cooler >>summers and warmer winters, an overall net cooling at >>the earth's surface and altered winds and weather >>patterns, Robock said. >> >> >>Yeah, slightly warmer in winter, a lot colder in >>summer. Net result? Cooling. >> >>sheesh... are YOU ever THICK! >> >> >> >>>"Although overall the planet cools after volcanic >>>eruptions, over Northern Hemisphere continents it >>>actually gets warmer in the winter. This is because >>>the wind patterns change in response to heating of >the >>>stratosphere by the volcanic aerosols." >>> >>> >>>href="http://earthobservatory.nasa.gov/Newsroom/Media >A >>l >>>erts/2002/200202157818.html">http://earthobservatory. >n >>a >>>sa.gov/Newsroom/MediaAlerts/2002/200202157818.html >> >>> >>> >>> >>> >>> >>> >>>>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/06112 >1 >>_ >>>e >>>>r >>>>>u >>>>>>ptions_nile.html">http://www.livescience.com/envir >o >>n >>>m >>>>e >>>>>n >>>>>>t/061121_eruptions_nile.html [ Next Thread | Previous Thread | Next Message | Previous Message ]

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Subject Author Date Never claimed it was Queenie -- merely Curmudgeon 08:44:17 11/28/06 Tue wow. that's a reach. -- sci guy, 15:44:38 11/28/06 Tue I guess the growing Hubbard Glacier in Alaska -- Curmudgeon, 16:37:38 11/28/06 Tue Again... one local effect.... -- sci guy, 19:23:08 11/28/06 Tue Re: Again... one local effect.... -- Duncan7, 08:40:51 11/29/06 Wed