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Sea surface temperatures of southern midlatitudes 0-160 kyr BP

机译：南部中纬度海表温度0-160 kyr BP

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[1] Late Quaternary climate fluctuated between extremes of glaciations, lasting similar to 90 kyr on average, and interglacial episodes, lasting similar to 10 kyr. Still largely unknown are the spatial and temporal evolution of these global climate states, with vigorous debate still underway on the mechanisms responsible for glacial inceptions and terminations. Though it is widely believed that the Southern Hemisphere oceans play a central role in global climate changes, few paleoclimate records exist from there. Here we present three new alkenone-derived SST records from the midlatitude Southern Hemisphere spanning the last 160 kyr, a full glacial-interglacial cycle. Our subtropical SST records from the last glacial period are characterized by ( 1) warming 47 - 23 kyr B. P., when high latitudes in both hemispheres cooled, and ( 2) milder temperatures during the penultimate glacial period than during the last glacial interval. These SST features are found to be of tropical- to subtropical-wide extent, implying increased thermal gradients at times of high-latitude ice sheet growth. This has implications for the vigor of atmospheric and upper ocean circulation and the transport of heat and moisture to the poles that may have been instrumental in the growth and maintenance of polar ice sheets during glacial periods.
机译：[1]晚第四纪气候在极端冰河之间波动，平均持续时间大约为90年，而在冰期之间，持续时间大约为10年。这些全球气候状态的时空演变仍是未知之数，有关冰川形成和终止的机制仍在进行激烈的辩论。尽管人们普遍认为南半球海洋在全球气候变化中起着核心作用，但那里几乎没有古气候记录。在这里，我们介绍了来自南半球中纬度的三个新的烯酮衍生的SST记录，这些记录跨越了最后一个160年，一个完整的冰川-冰川间周期。我们上次冰川期的亚热带海温记录的特征是（1）两个半球的高纬度降温时暖化了47-23吉尔吉斯（B. P. P.），以及（2）倒数第二个冰川期的温度比上次冰川期的温和。发现这些SST特征具有热带到亚热带范围，这意味着在高纬度冰盖生长时热梯度会增加。这对大气和上层海洋环流的旺盛以及热量和水分向极地的传输有影响，这可能在冰川期对极地冰盖的生长和维持有帮助。

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