A pervasive millennial-scale cycle in North Atlantic Holocene and glacial climates
A pervasive millennial-scale cycle in North Atlantic Holocene and glacial climates
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DOI：
10.1126/science.278.5341.1257
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发表时间：
1997-11-14
期刊：
影响因子：
56.9
通讯作者：
Bonani, G
中科院分区：
文献类型：
--
作者：
Bond, G;Showers, W;Bonani, G
来自北大西洋深海岩芯的证据表明，突然的变化打断了传统上认为相对稳定的全新世气候。在每一次事件中，来自冰岛北部的凉爽的、含冰的沃茨平流输送到英国纬度以南。大约在同一时间，格陵兰上空的大气环流突然发生变化。全新世事件和末次冰期期间气候突变的面貌在统计上是相同的;它们共同构成了一系列气候变化，周期接近1470 +/- 500年。因此，全新世事件似乎是一个普遍的千年尺度的气候循环独立于冰川间冰期气候状态的最新表现。最后一次冰期期间循环的扩大可能与北大西洋的温盐环流有关。
Evidence from North Atlantic deep sea cores reveals that abrupt shifts punctuated what is conventionally thought to have been a relatively stable Holocene climate. During each of these episodes, cool, ice-bearing waters from north of Iceland were advected as far south as the latitude of Britain. At about the same times, the atmospheric circulation above Greenland changed abruptly. Facings of the Holocene events and of abrupt climate shifts during the last glaciation are statistically the same; together, they make up a series of climate shifts with a cyclicity close to 1470 +/- 500 years. The Holocene events, therefore, appear to be the most recent manifestation of a pervasive millennial-scale climate cycle operating independently of the glacial-interglacial climate state. Amplification of the cycle during the last glaciation may have been linked to the North Atlantic's thermohaline circulation.