Unrealistically pristine air in the Arctic produced by current global scale models.
Unrealistically pristine air in the Arctic produced by current global scale models.
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DOI：
10.1038/srep26561
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发表时间：
2016-05-25
影响因子：
4.6
通讯作者：
Nakajima T
中科院分区：
文献类型：
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作者：
Sato Y;Miura H;Yashiro H;Goto D;Takemura T;Tomita H;Nakajima T
北极地区的黑碳气溶胶(BCA)通过辐射过程对全球气候系统产生深远影响。尽管影响巨大，但目前的全球规模模型是评估总体影响的强大工具，往往低估了北极几个季节的BCA水平。利用水平网格分辨率为3.5 公里的全球气溶胶输送模拟，我们确定较高的分辨率显著减少了对北极地区生物化学分析水平的低估，这主要是由于增强了低压和锋面系统的表示。用3.5公里网格分辨率模拟的北极BCA质量负荷是用粗网格分辨率(56公里)模拟的BCA质量负荷的4.2倍。我们的结果还表明，尽管使用了3.5公里的网格分辨率，但在云/云自由区和向极地的BCA质量通量之间的对比上并没有发生网格收敛。这些结果表明，需要使用千米级或更精细的网格分辨率进行全球气溶胶输送模拟，以便更准确地估计北极污染物的分布。
Black carbon aerosol (BCA) in the Arctic has profound impacts on the global climate system through radiation processes. Despite its enormous impacts, current global scale models, powerful tools for estimating overall impact, tend to underestimate the levels of BCA in the Arctic over several seasons. Using a global aerosol transport simulation with a horizontal grid resolution of 3.5 km, we determined that a higher resolution significantly reduced the underestimation of BCA levels in the Arctic, mainly due to an enhancement of the representation of low-pressure and frontal systems. The BCA mass loading in the Arctic simulated with 3.5-km grid resolution was 4.2-times larger than that simulated with coarse (56-km) grid resolution. Our results also indicated that grid convergence had not occurred on both the contrast between the cloud/cloud free areas and the poleward BCA mass flux, despite the use of the 3.5-km grid resolution. These results suggest that a global aerosol transport simulation using kilometre-order or finer grid resolution is required for more accurate estimation of the distribution of pollutants in the Arctic.