Holocene winter climate variability in mid-latitude western North America
Holocene winter climate variability in mid-latitude western North America
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DOI：
10.1038/ncomms2222
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发表时间：
2012-01
影响因子：
16.6
通讯作者：
V. Ersek;P. Clark;A. Mix;Hai Cheng;R. Lawrence Edwards
中科院分区：
文献类型：
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作者：
V. Ersek;P. Clark;A. Mix;Hai Cheng;R. Lawrence Edwards
北美西部的水资源依赖于冬季降水，但我们对其对气候变化的敏感性的了解仍然有限。同样，要了解未来冬季积雪减少的可能性，需要对自然气候变异性有更长远的看法。在这里，我们使用俄勒冈州西南部洞穴群中的稳定同位素来重建过去13,000年来大部分时间里的冬季气候变化。我们发现，在千禧年的时间尺度上，在暖干和冷湿之间存在突变。温度和降水在几十年到世纪的时间尺度上的变化与海洋-大气相互作用是一致的，这种相互作用是由类似太平洋年代际涛动的机制引起的。全新世期间的极端冷湿和暖干事件似乎对太阳强迫很敏感，可能是通过赤道太平洋对到达美国太平洋西北部地区的冬季风暴路径的影响。
Water resources in western North America depend on winter precipitation, yet our knowledge of its sensitivity to climate change remains limited. Similarly, understanding the potential for future loss of winter snow pack requires a longer perspective on natural climate variability. Here we use stable isotopes from a speleothem in southwestern Oregon to reconstruct winter climate change for much of the past 13,000 years. We find that on millennial time scales there were abrupt transitions between warm-dry and cold-wet regimes. Temperature and precipitation changes on multi-decadal to century timescales are consistent with ocean-atmosphere interactions that arise from mechanisms similar to the Pacific Decadal Oscillation. Extreme cold-wet and warm-dry events that punctuated the Holocene appear to be sensitive to solar forcing, possibly through the influence of the equatorial Pacific on the winter storm tracks reaching the US Pacific Northwest region.