(Table 1) Age determination of sediment cores F2-92-P3 and F2-92-P40

Although climate records from several locations around the world show nearly synchronous and abrupt changes, the nature of the inferred teleconnection is still poorly understood. On the basis of preserved laminations and molybdenum enrichments in open margin sediments we demonstrate that the oxygen content of northeast Pacific waters at 800 m depth during the Bölling-Alleröd warm period (15–13 kyr) was greatly reduced. Existing oxygen isotopic records of benthic and planktonic foraminifera suggest that this was probably due to suppressed ventilation at higher latitudes of the North Pacific. Comparison with ventilation records for the North Atlantic indicates an antiphased pattern of convection relative to the North Pacific over the past 22 kyr, perhaps due to variations in water vapor transport across Central America.

尽管全球多处地点的气候记录均显示出近乎同步且突变的气候变化特征，但由此推断出的遥相关（teleconnection）机制仍未得到充分阐明。基于开阔陆缘沉积物中保存的纹层与钼富集特征，我们证实，博林-阿勒罗德暖期（Bölling-Alleröd warm period，15~13 kyr）期间，东北太平洋800米深度水体的含氧量大幅降低。现有底栖有孔虫与浮游有孔虫的氧同位素记录表明，这一现象大概率源于北太平洋高纬度海域的水体通风作用受到抑制。将其与北大西洋的水体通风记录对比后发现，过去22 kyr以来，海洋对流活动的变化模式与北太平洋呈反相位特征，这或许与中美洲地区的水汽输送变化有关。