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 ARKTİK VE ANTARTİK BUZULLARININ DEĞİŞİMİ

 Gerek kuzey kutbunda ve gerekse güney kutbundaki buzulların ergimesinin , dünyanın deniz seviyesinde değişikliğe neden olacağı endişesi bilim çevrelerince kabul görüyor. Bunun tartışıldığı bir video ve sunumu izlemenizi öneririm.

  Ama korkulanın tersi oldu ve 2014 yılı, 19 Eylül tarihinde antartikadaki buzul katmanı en büyük alanı kapladı.


Milyon yıl öncesi hava kabarcıkları, iklim göstergesi oldu..
Million-Year-Old Bubbles Reveal Antarctica's Oldest Climate Snapshot


Antarktika'da sondaj alanı

 A whiff of air frozen in ice for 1 million years provides a new snapshot of Earth's ancestral climate. Scientists uncovered the ancient climate record from Antarctic blue ice. The ice core was drilled from a region called the Allan Hills, about an hour by plane from the McMurdo research station. Bubbles inside the ice are tiny windows into Earth's former atmosphere. Gases such as carbon dioxide and methane were trapped and preserved inside the bubbles when snow fell in the past. Though the ice core doesn't capture a continuous climate record, the "time machine" does offer the oldest picture yet of Earth's bygone climate from Antarctic ice, researchers said.


 ANTARTİKANIN DEV BUZULLARI DERİN DENİZDEKİ SOĞUK SU SİRKÜLASYONUNU ENGELLİYOR.


MERTZ BUZULU

 Colossal icebergs careening along the Antarctic coastline can shut down the deep, cold currents that help drive ocean circulation, a new study reports. These aren't everyday icebergs, even by Antarctica's mighty standards — these huge icebergs are the size of small European countries. Unleashed by fracturing glaciers, they interfere with the Antarctic Ocean's sea-ice factories, called polynyas, according to the study. The open-water polynyas persist year-round, allowing bitter winter winds to freeze seawater into freshwater ice, leaving behind dense, salty seawater that sinks to the ocean depths. These sinking currents, called the Antarctic Bottom Water, are a major driver of oceanic circulation, said study co-author Guillaume Massé, a paleoclimatologist at the University of Laval in Quebec, Canada.


 

 





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