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首页> 外文期刊>Paleoceanography >Intermediate depth warming in the tropical Atlantic related to weakened thermohaline circulation: Combining paleoclimate data and modeling results for the last deglaciation
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Intermediate depth warming in the tropical Atlantic related to weakened thermohaline circulation: Combining paleoclimate data and modeling results for the last deglaciation

机译：热带大西洋中间深度变暖与热盐环流减弱有关：结合古气候数据和最后一次冰消的模拟结果

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摘要

Benthic foraminiferal oxygen isotope ratios from two sediment cores recovered at 426 and 1299 m water depth in the eastern and western tropical Atlantic show that a slowdown of the thermohaline circulation (THC) during Heinrich event H1 and the Younger Dryas was accompanied by rapid and intense warming of intermediate depth waters. Millennial-scale covariations of low paleosalinities in the subpolar North Atlantic with decreased benthic oxygen isotope ratios in the eastern tropical Atlantic throughout the past 10,000 years suggest that THC weakening might be related to middepth warming during the Holocene period as well. Climate model experiments simulating a strong reduction of the THC in the Atlantic Ocean under present-day and glacial conditions reveal that the increase of temperature in the middepth tropical and South Atlantic is a common feature for both climatic states, caused by a reduced ventilation of cold intermediate and deep waters in conjunction with downward mixing of heat from the thermocline. From the similarity of the paleoclimatic records with the model simulations, we infer that the characteristic pattern of temperature change in the Atlantic Ocean related to weakened thermohaline circulation can serve as an indicator of present-day and future THC slowdown.
机译：在东部和西部热带大西洋的426和1299 m水深处回收的两个沉积物核心的底栖有孔虫氧同位素比值表明，在Heinrich事件H1和Younger Dryas期间，热盐循环（THC）的放缓伴随着迅速强烈的变暖中深度水域。在过去的10,000年中，北极亚极低盐度与千层底氧同位素比下降的千年尺度协变表明，在整个全新世时期，THC减弱也可能与中深度变暖有关。气候模型实验模拟了当今和冰川条件下大西洋中THC的强烈降低，结果表明，由于寒冷的通风减少，热带和南大西洋中深层温度升高是两种气候状态的共同特征中温和深水，以及来自温跃层的热量向下混合。从古气候记录与模型模拟的相似性，我们推断大西洋中与温盐环流减弱有关的温度变化特征模式可以作为当前和未来THC速度下降的指标。

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