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棋牌百家

时间:2021-03-03

合家欢乐,棋牌百家

棋牌百“Here you have something that is so incontrovertible, it’s like, okay, this is it.棋牌百Within the peat — packed remains of partially decomposed plants — oxygen-bearing organic compounds called cellulose contain clues to the climate history of the region.棋牌百Sign Up For the Latest from Science NewsHeadlines and summaries of the latest Science News articles, delivered to your inboxRain falling on the island contains two different isotopes, or forms, of oxygen: oxygen-18 and oxygen-16.棋牌百The relative values of those isotopes in the rainfall change depending on atmospheric conditions, and as plants take up that oxygen from the air, they record those changes.。棋牌百家。棋牌百By analyzing the amounts of those isotopes in the cellulose over time, the team was able to track changes in precipitation and atmospheric circulation going back 5,500 years.棋牌百Then, the team established the link between this oxygen isotope record and sea ice extent.棋牌百Bering Sea ice is known to be directly tied to shifts in wind direction.

棋牌百The relative values of those isotopes in the rainfall change depending on atmospheric conditions, and as plants take up that oxygen from the air, they record those changes.。棋牌百家。棋牌百By analyzing the amounts of those isotopes in the cellulose over time, the team was able to track changes in precipitation and atmospheric circulation going back 5,500 years.

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