Partin J W, Quinn T M, Shen C-C, Okumura Y, Cardenas M B, Siringan F P, Banner J L, Lin K, Hu H-M, Taylor F W
Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas 78758, USA.
Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas 78712, USA.
Nat Commun. 2015 Sep 2;6:8061. doi: 10.1038/ncomms9061.
Proxy records of temperature from the Atlantic clearly show that the Younger Dryas was an abrupt climate change event during the last deglaciation, but records of hydroclimate are underutilized in defining the event. Here we combine a new hydroclimate record from Palawan, Philippines, in the tropical Pacific, with previously published records to highlight a difference between hydroclimate and temperature responses to the Younger Dryas. Although the onset and termination are synchronous across the records, tropical hydroclimate changes are more gradual (>100 years) than the abrupt (10-100 years) temperature changes in the northern Atlantic Ocean. The abrupt recovery of Greenland temperatures likely reflects changes in regional sea ice extent. Proxy data and transient climate model simulations support the hypothesis that freshwater forced a reduction in the Atlantic meridional overturning circulation, thereby causing the Younger Dryas. However, changes in ocean overturning may not produce the same effects globally as in Greenland.
来自大西洋的温度代理记录清楚地表明，新仙女木事件是末次冰消期期间的一次突然气候变化事件，但在界定该事件时，水文气候记录未得到充分利用。在此，我们将来自热带太平洋菲律宾巴拉望岛的一份新的水文气候记录与先前发表的记录相结合，以突出水文气候和温度对新仙女木事件的响应差异。尽管各记录中的开始和结束是同步的，但热带水文气候变化比北大西洋突然（10 - 100年）的温度变化更为渐进（>100年）。格陵兰岛气温的突然回升可能反映了区域海冰范围的变化。代理数据和瞬态气候模型模拟支持这样的假说，即淡水促使大西洋经向翻转环流减弱，从而导致了新仙女木事件。然而，海洋翻转的变化在全球范围内可能不会产生与格陵兰岛相同的影响。
