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首页> 外文期刊>Climate dynamics >Stratospheric ozone depletion: a key driver of recent precipitation trends in South Eastern South America
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Stratospheric ozone depletion: a key driver of recent precipitation trends in South Eastern South America

机译：平流层臭氧消耗：南美东南部近期降水趋势的主要驱动力

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摘要

On a hemispheric scale, it is now well established that stratospheric ozone depletion has been the principal driver of externally forced atmospheric circulation changes south of the Equator in the last decades of the 20th Century. The impact of ozone depletion has been felt over the entire hemisphere, as reflected in the poleward drift of the midlatitude jet, the southward expansion of the summertime Hadley cell and accompanying precipitation trends deep into the subtropics. On a regional scale, however, surface impacts directly attributable to ozone depletion have yet to be identified. In this paper we focus on South Eastern South America (SESA), a region that has exhibited one of the largest wetting trends during the 20th Century. We study the impact of ozone depletion on SESA precipitation using output from 6 different climate models, spanning a wide range of complexity. In all cases we contrast pairs of model integrations with and without ozone depletion, but with all other forcings identically specified. This allows for unambiguous attribution of the computed precipitation trends. All 6 climate models consistently reveal that stratospheric ozone depletion results in a significant wetting of SESA over the period 1960-1999. Taken as a whole, these model results strongly suggest that the impact of ozone depletion on SESA precipitation has been as large as, and quite possibly larger than, the one caused by increasing greenhouse gases over the same period.
机译：在半球规模上，现已充分认识到，在20世纪最后几十年中，平流层臭氧消耗一直是赤道以南外部强迫大气环流变化的主要驱动力。整个半球都感受到了臭氧消耗的影响，这反映在中纬度急流的极点漂移，夏季哈德利电池向南膨胀以及伴随降水趋势深入到亚热带地区。但是，在区域范围内，尚未确定直接归因于臭氧消耗的表面影响。在本文中，我们重点介绍南美东南部地区（SESA），该地区在20世纪是最大的润湿趋势之一。我们使用6种不同气候模型的输出研究了臭氧消耗对SESA降水的影响，涉及的复杂性范围很广。在所有情况下，我们对比有和没有臭氧消耗的模型积分对，但所有其他强迫都相同。这可以使计算出的降水趋势具有明确的归属。所有6个气候模型都一致地表明，在1960-1999年期间，平流层臭氧消耗导致SESA显着润湿。从总体上看，这些模型结果强烈表明，臭氧消耗对SESA降水的影响与同期温室气体增加所造成的影响一样大，甚至可能更大。

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  • 来源
    《Climate dynamics》 |2014年第8期|1775-1792|共18页
  • 作者

    Paula L. M. Gonzalez; Lorenzo M. Polvani; Richard Seager; Gustavo J. P. Correa;

  • 作者单位

    International Research Institute for Climate and Society, Columbia University, 61 Route 9W, 202b Monell, Palisades, NY 10964, USA;

    Department of Applied Physics and Applied Mathematics, Columbia University, 500 West 120th Street, S.W. Mudd, Room 216, New York, NY 10027, USA ,Department of Earth and Environmental Sciences, Columbia University, 500 West 120th Street, S.W. Mudd, Room 216, New York, NY 10027, USA ,Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Oceanography, Palisades, NY 10964, USA;

    Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Oceanography, Palisades, NY 10964, USA;

    Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Oceanography, Palisades, NY 10964, USA;

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

    Precipitation; Ozone depletion; South America;

    机译：沉淀;臭氧耗竭;南美洲;

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