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首页> 外文期刊>Geophysical Research Letters >Antarctic Sea Ice Expansion, Driven by Internal Variability, in the Presence of Increasing Atmospheric CO2
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Antarctic Sea Ice Expansion, Driven by Internal Variability, in the Presence of Increasing Atmospheric CO2

机译:南极海冰膨胀,由内部变异驱动,在增加大气二氧化碳的情况下

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摘要

A number of physically based hypotheses have been proposed to explain the surprising expansion of Antarctic sea ice area (SIA) over the satellite era (1979 to 2015). Here, we use a fully coupled state-of-the-art global climate model to show that internal variability alone can produce such multidecadal periods of Antarctic SIA expansion even as atmospheric CO2 increases at observed rates and the planet warms. When our model is started from a relatively warm Southern Ocean state, Antarctic SIA sometimes (in one of three ensemble members) expands over multidecadal time scales at a rate comparable to that over the satellite era. SIA expansion occurs concurrently with rising atmospheric CO2 and warming global surface temperatures, and SIA trends by region and sector resemble those over the satellite era. Our results suggest that internal variability over long time scales in the Southern Ocean region may suffice to explain Antarctic SIA expansion over the satellite era.
机译:已经提出了许多物理基础的假设,以解释南极海冰区(SIA)在卫星时代(1979年至2015年)的令人惊讶的扩张。 在这里,我们使用完全耦合的最新全球气候模型,表明单独的内部变异可以产生这种多分析时段的南极SIA扩张,即使在观察到的速率和行星温暖的情况下增加。 当我们的模型从南洋南部的南部海洋州开始时,有时(三个集合成员之一)的南极SIA以与卫星时代的速率相当的速率扩展了多个时间尺度。 SIA扩展同时发生,随着大气二氧化碳的不断上升和温暖的全球表面温度,地区和地区的SIA趋势类似于卫星时代的SIA趋势。 我们的研究结果表明,南洋地区长期尺度的内部变异可能足以解释诸如卫星时代的南极SIA扩张。

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