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Competing Temperature and Atmospheric Circulation Effects on Southwest Madagascan Rainfall During the Last Deglaciation

机译：竞争温度和大气循环效应在最后一个亡航期间马达加斯加的降雨量降雨量

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摘要

The global paleomonsoon concept predicts an antiphase response of monsoon rainfall in the Northern and Southern Hemispheres at timescales where there is asymmetric solar forcing and/or asymmetric hemispheric temperature changes. However, as different monsoon systems have different sensitivities to local, regional, and global forcing, rainfall response may vary regionally, particularly during large global climatic changes such as the last deglaciation where warming occurred in both hemispheres. Despite its role as a key Southern Hemisphere counterpart to the Arabian and Indian summer monsoons, the behavior of the summer monsoon in the Southern Hemisphere of the Indian Ocean during the last deglaciation is unknown. Therefore, we present a new high-resolution, precisely dated, and replicated speleothem stable isotope record from Tsimanampesotse National Park in southwest Madagascar that covers the last deglaciation. We show that speleothem growth phases respond largely to movements of the Southern Hemisphere summer Hadley circulation (summer extent of the tropical rainbelt/mean Intertropical Convergence Zone location), with some contribution from sea surface temperature changes at key times, such as during the B?lling-Aller?d. In contrast, speleothem δ~(18)Ο responds primarily to sea surface temperature, in particular the location of the deep atmospheric convection isotherm, while summer Hadley circulation changes take a secondary role. Separating the varying influences of temperature and atmospheric circulation in controlling southwest Madagascan rainfall is critical to understanding rainfall variability in both the past and the future.
机译：全球古逊町概念预测北部和南部半球的季风降雨处的抗磷血响应，在时间锻造，在太阳能迫使和/或不对称半球温度变化的时间内。然而，随着不同的季风系统对局部，区域和全球迫使不同的敏感性，降雨反应可能会在区域地区变化，特别是在大规模的全球气候变化期间，例如在两个半球中发生变暖的最后一个嗜好。尽管它作为阿拉伯和印度夏季季风的关键南半球对应的作用，但在最后一个嗜好期间印度洋南半球夏季季风的行为是未知的。因此，我们提出了一项新的高分辨率，精确的日期和复制的Speleothem稳定的同位素稳定的同位素，从西南部的马达加斯加省占地面积占领了最后的解析。我们展示斯派比斯的生长阶段主要响应南半球夏天荷兰·罗德利循环的运动（热带雨水/平均闭管会区的夏季范围），在海面温度变化的一些贡献在关键时期，例如在B？ ling-aller？d。相比之下，Speleothemδ〜（18）ο主要响应海面温度，特别是深度大气对流等温线的位置，而夏天Hadley循环变化采取次要作用。分离温度和大气循环在控制西南部的水中降雨中的不同影响对于了解过去和未来的降雨变异至关重要。

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  • 来源
    《Paleoceanography》 |2019年第2期|共12页
  • 作者

    Nick Scroxton; Stephen J. Burns; David McGee; Ben Hardt; Laurie R. Godfrey; Lovasoa Ranivoharimanana; Peterson Faina;

  • 作者单位

    Department of Geosciences University of Massachusetts Amherst MA USA;

    Department of Geosciences University of Massachusetts Amherst MA USA;

    Department of Anthropology University of Massachusetts Amherst MA USA;

    Department of Anthropology University of Massachusetts Amherst MA USA;

    Department of Anthropology University of Massachusetts Amherst MA USA;

    Mention Bassins sédimentaires Evolution Conservation Faculté des Sciences Université d'Antananarivo Antananarivo Madagascar;

    Mention Bassins sédimentaires Evolution Conservation Faculté des Sciences Université d'Antananarivo Antananarivo Madagascar;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
  • 关键词

    Competing Temperature; Atmospheric Circulation; Effects on;

    机译：竞争温度;大气循环;影响;

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