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Rapid variations in deep ocean temperature detected in the Holocene

机译:全新世发现的深海温度快速变化

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摘要

The observational record of deep ocean variability is short, which makes it difficult to attribute the recent rise in deep ocean temperatures to anthropogenic forcing. Here we test a new proxythe oxygen isotopic signature of individual benthic foraminiferato detect rapid (i.e., monthly to decadal) variations in deep ocean temperature and salinity in the sedimentary record. We apply this technique at 1000m water depth in the Eastern Equatorial Pacific during seven 200 year Holocene intervals. Variability in foraminifer O-18 over the past 200years is below the detection limit, but O-18 signatures from two mid-Holocene intervals indicate temperature swings >2 degrees C within 200years. More vigorous transport between the surface and deep ocean or stronger eddy variability than that observed in the historical record are potential explanations. Distinguishing externally forced climate trends in deep ocean properties from unforced variability should be possible with systematic analysis of suitable deep sea cores.
机译:深海变率的观测记录很短,这使得很难将最近的深海温度升高归因于人为强迫。在这里,我们测试了一个新的代理-单个底栖有孔虫的氧气同位素特征可以检测到沉积记录中深海温度和盐度的快速变化(即每月至十年)。我们在7个200年全新世间隔期间在赤道东太平洋1000m水深处应用了该技术。在过去200年中,有孔虫O-18的变异性低于检出限,但两次全新世中期的O-18信号表明200年内温度波动> 2摄氏度。可能的解释是,与历史记录相比,海面和深海之间的运输更加剧烈,或者涡流的变化更大。通过对适当的深海核心进行系统分析,应该有可能将深海属性中的外来强迫性气候趋势与非强迫性变化区分开来。

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