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Correlation between Arabian Sea and Greenland climate oscillations of the past 110,000 years

机译:过去110,000年阿拉伯海与格陵兰岛气候振荡之间的相关性

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Palaeoclimate studies have revealed the general high-frequency instability of Late Pleistocene climate—for example, the so-called Dansgaard-Oeschger and Heinrich events—on timescales of a few millennia, centuries or even decades. Here we present evidence for a general relationship between low-latitude monsoo-nal climate variability and the rapid temperature fluctuations of high northern latitudes that are recorded in the Greenland ice records. Sediment cores from the northeastern Arabian Sea show laminated, organic-carbon-rich bands, reflecting strong monsoon-induced biological productivity, that correlate with the mild interstadial climate events in the northern North Atlantic region. In contrast, periods of lowered southwest monsoonal intensity, indicated by bioturbated, organic-carbon-poor bands, are associated with intervals of high-latitude atmospheric cooling and the injection of melt water into the North Atlantic basin. Our records suggest that Dansgaard—Oeschger and Heinrich events are strongly expressed in low-latitude (monsoonal) climate variability, suggesting the importance of common forcing agents such as atmospheric moisture and other greenhouse gases.
机译:古气候研究已经揭示了晚更新世气候的总体高频不稳定性,例如所谓的Dansgaard-Oeschger和Heinrich事件,其时间尺度为几千年,几百年甚至几十年。在这里,我们为格陵兰岛冰记录中记录的低纬度季风气候变化与北部高纬度的快速温度波动之间的一般关系提供证据。来自阿拉伯海东北部的沉积物岩心呈层状,富含有机碳带,反映了强烈的季风诱导的生物生产力,与北大西洋北部北部温和的陆间气候事件有关。相反,由生物扰动的有机碳贫乏带所指示的西南季风强度降低的时期与高纬度大气降温的间隔以及向北大西洋盆地注入融化水有关。我们的记录表明,在低纬度(季风)气候变化中强烈表达了Dansgaard-Oeschger和Heinrich事件,表明大气压力和其他温室气体等常见强迫因素的重要性。

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