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Ensemble, water isotope-enabled, coupled general circulation modeling insights into the 8.2 ka event

机译：集成，启用水同位素，结合一般循环建模对8.2 ka事件的见解

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摘要

Freshwater forcing has long been postulated as a catalyst for abrupt climate change because of its potential to interfere with thermohaline circulation (THC). The most recent example may have occurred about 8.2 ka ago with the sudden drainage of glacial lakes Agassiz and Ojibway into the Hudson Bay. We perform an ensemble of simulations for this freshwater release using the fully coupled atmosphere ocean general circulation model, Goddard Institute for Space Studies ModelE-R. In all cases, simulated effects include reduced ocean heat transport and enhanced atmospheric heat transport in the Atlantic, increased surface albedo ( through greater low cloud and sea ice cover), and local cooling of up to 3 degrees C. Our suite of ensemble experiments allows us to examine the importance of the initial ocean state, in particular the presence or absence of Labrador Sea Water, in controlling the magnitude and length of the climate response. Water isotope tracers included in this model provide an improved means for direct comparisons of the modeled tracer response to water isotope-based, climate proxy data. Comparison of model simulations to data implies that there was an abrupt approximate halving of Atlantic THC, hence providing strong support for the hypothesis that the 8.2 ka event was caused by an abrupt release of fresh water into the North Atlantic.
机译：长期以来，人们一直认为淡水强迫是气候突然变化的催化剂，因为它有可能干扰热盐循环（THC）。最近的例子可能发生在大约8.2 ka以前，当时冰川湖Agassiz和Ojibway突然排入哈德逊湾。我们使用完全耦合的大气海洋总循环模型戈达德空间研究所ModelE-R对这种淡水释放进行了一系列模拟。在所有情况下，模拟的影响都包括减少海洋热传输和增强大西洋中的大气热传输，增加地表反照率（通过更大的低云层和海冰覆盖）以及局部冷却至3摄氏度。我们的整体实验可以我们研究了初始海洋状态（尤其是拉布拉多海水存在与否）在控制气候响应的幅度和持续时间方面的重要性。该模型中包括的水同位素示踪剂为直接比较建模示踪剂对基于水同位素的气候代理数据的响应提供了一种改进的手段。将模型模拟与数据进行比较表明，大西洋THC大约突然减半，因此为8.2 ka事件是由淡水突然注入北大西洋引起的这一假设提供了有力的支持。

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