Strong control of effective radiative forcing by the spatial pattern of absorbing aerosol
Strong control of effective radiative forcing by the spatial pattern of absorbing aerosol
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DOI：
10.1038/s41558-022-01415-4
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发表时间：
2021-12
影响因子：
30.7
通讯作者：
A. Williams;P. Stier;G. Dagan;D. Watson‐Parris
中科院分区：
文献类型：
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作者：
A. Williams;P. Stier;G. Dagan;D. Watson‐Parris
在未来几十年中，预计人为气溶胶的空间格局将发生巨大变化，全球气溶胶成分将变得相对更易吸收。然而，这种不断变化的吸收气溶胶的空间格局的气候影响得到了相对较少的关注，特别是其对全球平均有效辐射强迫的影响。在这里，使用模型实验，我们表明，吸收气溶胶的有效辐射强迫强烈地依赖于它们的位置，由云和环流的快速调整驱动。我们的实验产生积极的有效辐射强迫响应气溶胶吸收整个中纬度地区和大部分的热带地区，和一个强大的“热点”的负有效辐射强迫响应气溶胶吸收在热带西太平洋。此外，这些不同的响应可以有力地归因于大气动力学的变化，并强调了这种“气溶胶模式效应”的重要性，从区域生物质燃烧气溶胶的瞬态强迫。
Over the coming decades, it is expected that the spatial pattern of anthropogenic aerosol will change dramatically and the global aerosol composition will become relatively more absorbing. Yet, the climatic impact of this evolving spatial pattern of absorbing aerosol has received relatively little attention, in particular its impact on global-mean effective radiative forcing. Here, using model experiments, we show that the effective radiative forcing from absorbing aerosol varies strongly depending on their location, driven by rapid adjustments of clouds and circulation. Our experiments generate positive effective radiative forcing in response to aerosol absorption throughout the midlatitudes and most of the tropical regions, and a strong ‘hot spot’ of negative effective radiative forcing in response to aerosol absorption over the tropical Western Pacific. Further, these diverse responses can be robustly attributed to changes in atmospheric dynamics and highlight the importance of this ‘aerosol pattern effect’ for transient forcing from regional biomass-burning aerosol.