The effect of high dust amount on the surface temperature during the Last Glacial Maximum : A modelling study using MIROC-ESM
The effect of high dust amount on the surface temperature during the Last Glacial Maximum : A modelling study using MIROC-ESM
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末次盛冰期高尘埃量对地表温度的影响：使用 MIROC-ESM 进行的建模研究
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
M. Kawamiya
中科院分区：
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作者：
R. Ohgaito;A. Abe‐Ouchi;Ryouta O’ishi;T. Takemura;A. Ito;Tomohiro;Hajima;S. Watanabe;M. Kawamiya
气溶胶的影响是未来气候预测中的众多不确定因素之一。然而，10 矿物粉尘气溶胶（粉尘）的行为可以在过去气候变化的背景下进行研究。众所周知，末次盛冰期（LGM）导致灰尘沉积增加，特别是在极地地区。利用气候地球系统模型跨学科研究模型（MIROC-ESM），我们研究了冰川尘埃对末次盛冰期气候的影响，发现尘埃增强的影响导致极地地区的降温减少。 15 冷却减少的主要原因之一是雪或冰的老化，导致高灰尘沉积导致反照率降低，特别是在高冰川灰尘排放附近。尽管高冰川尘埃来源的背风处的净辐射扰动是负的，但雪老化造成的变暖克服了北半球的这种辐射扰动。相比之下，对流层高尘埃负荷引起的辐射扰动使南极洲周围的地表变暖，这主要是由20尘埃的长波气溶胶-云相互作用引起的，很可能是对流层上层云部分增强的温室效应的结果。尽管我们的分析主要集中于使用 MIROC-ESM 大气部分的实验结果，但我们还进行了完整的 MIROC-ESM 实验，以进行冰川尘模型的首次试验。据观察，北半球变暖的长期趋势是随着冰川尘埃的增加而加剧，而南极洲周围的变暖水平几乎没有变化，即使在与海洋长期相互作用后 25 也是如此。爬升。过去的讨论，https://doi.org/10.5194/cp-2018-2 Clim 杂志正在审查手稿。过去的讨论开始于：2018 年 2 月 21 日 c © 作者 2018。CC BY 4.0 许可证。
The effect of aerosols is one of the many uncertain factors in projections of the future climate. However, 10 the behaviour of mineral dust aerosol (dust) can be investigated in the context of past climate changes. The Last Glacial Maximum (LGM) is known to have resulted in an enhancement of the dust deposition, especially over the polar regions. Using the Model for Interdisciplinary Research on Climate Earth System Model (MIROC-ESM), we investigated the impact of glaciogenic dust on the climate of the LGM and found that the effect of the enhancement of dust results in less cooling over the polar regions. One of the major reasons of the reduced 15 cooling is the ageing of snow or ice, resulting in the reduction of the albedo by a high dust deposition, especially in the vicinity of high glaciogenic dust emissions. Although the net radiative perturbations in the lee of high glaciogenic dust provenances are negative, warming by ageing of snow overcomes this radiative perturbation in the Northern Hemisphere. In contrast, the radiative perturbation by the high dust loading in the troposphere acts to warm the surface surrounding Antarctica, which is mainly caused by the longwave aerosol–cloud interaction of 20 dust and is likely the result of the greenhouse effect of the enhanced cloud fraction in the upper troposphere. Although our analysis mainly focused on the results of the experiments using the atmospheric part of the MIROC-ESM, we also conducted full MIROC-ESM experiments for a first trial of glacial dust modelling. The long-term trend to enhance warming in the Northern Hemisphere with the increase of glaciogenic dust was observed, whereas the warming level around Antarctica is almost unchanged, even after an extended interaction 25 with the ocean. Clim. Past Discuss., https://doi.org/10.5194/cp-2018-2 Manuscript under review for journal Clim. Past Discussion started: 21 February 2018 c © Author(s) 2018. CC BY 4.0 License.