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首页> 外文期刊>Paleoceanography >Decadal-to centennial-scale tropical Atlantic climate variability across a Dansgaard-Oeschger cycle
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Decadal-to centennial-scale tropical Atlantic climate variability across a Dansgaard-Oeschger cycle

机译：整个Dansgaard-Oeschger周期从十年代到百年尺度的热带大西洋气候变化

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The patterns and forcing mechanisms of climate variability on decadal to centennial time scales represent a major void in our current understanding of Earth's climate system. Furthermore, the response of the low latitudes to abrupt climate change is also not well understood, as most high-resolution paleoclimate studies are from midlatitudes and high latitudes. This study explores the tropical Atlantic response to a Dansgaard-Oeschger cycle (Interstadial 12) using ultra-high resolution(～2-3 years)foraminiferal census data from Cariaco Basin sediments. The interpretation of the abundance records for the onset of Interstadial 12 is complicated by the competing effects of rising sea level on Ekman-induced upwelling within the Cariaco Basin and migrating Intertropical Convergence Zone-associated variations in trade wind location and fluvial nutrient delivery to the basin. The foraminiferal abundance records for the latter part of the interstadial suggest a southerly shift in the average annual position of the Intertropical Convergence Zone that acted to enhance upwelling and productivity within the Cariaco Basin. Sea level eventually reached a critical point in the transition back to stadial conditions that led to upwelling of nutrient-depleted waters and a decline in productivity within the basin. Spectral analyses of the Globigerina bulloides absolute abundance records reveal significant variability ranging from subdecadal-to centennial-scale. Atlantic multidecadal-scale climate variability is only evident in the warmest interval of Interstadial 12, suggesting that variability on this scale may only operate during warm climate periods, something that has significant implications for modern and near-future climate variability.
机译：年代际到百年尺度上气候变化的模式和强迫机制，代表了我们目前对地球气候系统认识的主要空白。此外，由于大多数高分辨率的古气候研究都来自中纬度和高纬度，因此对低纬度对突然的气候变化的反应也没有很好的理解。这项研究使用来自Cariaco盆地沉积物的超高分辨率（〜2-3年）有孔虫普查数据，探索了热带大西洋对Dansgaard-Oeschger周期（Interstadial 12）的响应。海平面上升对埃里亚曼诱发的Cariaco盆地上涌和热带过渡带汇合带迁移相关的贸易风位置和河流营养物输送的变化的竞争效应使Interstadial 12的丰度记录的解释变得复杂。 。星际间后期的有孔虫丰度记录表明，热带辐合带年平均位置向南移动，这有助于增强Cariaco盆地内的上升流和生产力。海平面最终回到过渡状态，达到临界点，导致营养耗尽的水上升，流域内的生产力下降。球形大球藻绝对丰度记录的光谱分析显示，从年代际尺度到百年尺度，变化很大。大西洋多年代尺度的气候变化仅在际际12最温暖的时间间隔内才可见，这表明这种尺度的变化可能仅在温暖的气候周期内起作用，这对现代和近来的气候变化具有重要意义。

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