Southern Hemisphere and Deep-Sea Warming Led Deglacial Atmospheric CO2 Rise and Tropical Warming
Southern Hemisphere and Deep-Sea Warming Led Deglacial Atmospheric CO2 Rise and Tropical Warming
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DOI：
10.1126/science.1143791
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发表时间：
2007-10
期刊：
影响因子：
56.9
通讯作者：
L. Stott;A. Timmermann;R. Thunell
中科院分区：
文献类型：
--
作者：
L. Stott;A. Timmermann;R. Thunell
要确定是什么导致了地球过去最大的气候变化，需要对强迫和区域反应都有精确的了解。我们确定的年代学的高纬度和低纬度的气候变化在末次冰期结束的放射性碳定年底栖和浮游有孔虫稳定同位素和镁/钙记录从海洋核心收集在热带太平洋西部。深海温度在距今1.9万年至1.7万年前（ky B. P.）升高了1.2摄氏度，导致大气中二氧化碳的增加和热带海洋表面变暖的时间长达1000年。这种冰消期深水变暖的原因并不在于热带地区，也不能将其在19至17 kyB. P.之间的早期发作归因于CO2强迫。南方春季太阳辐射的增加加上海冰的反作用似乎是造成这种变暖的关键因素。
Establishing what caused Earth's largest climatic changes in the past requires a precise knowledge of both the forcing and the regional responses. We determined the chronology of high- and low-latitude climate change at the last glacial termination by radiocarbon dating benthic and planktonic foraminiferal stable isotope and magnesium/calcium records from a marine core collected in the western tropical Pacific. Deep-sea temperatures warmed by ∼2°C between 19 and 17 thousand years before the present (ky B.P.), leading the rise in atmospheric CO2 and tropical–surface-ocean warming by ∼1000 years. The cause of this deglacial deep-water warming does not lie within the tropics, nor can its early onset between 19 and 17 ky B.P. be attributed to CO2 forcing. Increasing austral-spring insolation combined with sea-ice albedo feedbacks appear to be the key factors responsible for this warming.