Reduced Poleward Transport Due to Stratospheric Heating Under Stratospheric Aerosols Geoengineering
Reduced Poleward Transport Due to Stratospheric Heating Under Stratospheric Aerosols Geoengineering
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DOI：
10.1029/2020gl089470
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发表时间：
2020-09
影响因子：
5.2
通讯作者：
D. Visioni;D. MacMartin;B. Kravitz;W. Lee;I. Simpson;J. Richter
中科院分区：
文献类型：
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作者：
D. Visioni;D. MacMartin;B. Kravitz;W. Lee;I. Simpson;J. Richter
通过在四个纬度（30°，15°N/S）向平流层注入SO2，不仅可以降低全球平均表面温度，还可以最大限度地减少赤道到极点和半球间温度梯度的变化，进一步减少气候变化相对于赤道注入的一些影响。只有当气溶胶通过平流层环流被输送到高纬度时，才能发生这种情况，确保更大部分的太阳辐射被反射回高纬度的太空，以补偿减少的阳光。然而，这些气溶胶产生的平流层加热改变了环流，加强了平流层极地涡旋，这是向两极输送空气的障碍。我们展示了加热如何导致反馈，其中增加注入速率导致更强的高纬度运输障碍。这意味着高纬度气溶胶负担和随后的冷却可能受到限制。
By injecting SO2 into the stratosphere at four latitudes (30°, 15°N/S), it might be possible not only to reduce global mean surface temperature but also to minimize changes in the equator‐to‐pole and inter‐hemispheric gradients of temperature, further reducing some of the impacts arising from climate change relative to equatorial injection. This can happen only if the aerosols are transported to higher latitudes by the stratospheric circulation, ensuring that a greater part of the solar radiation is reflected back to space at higher latitudes, compensating for the reduced sunlight. However, the stratospheric heating produced by these aerosols modifies the circulation and strengthens the stratospheric polar vortex which acts as a barrier to the transport of air toward the poles. We show how the heating results in a feedback where increasing injection rates lead to stronger high‐latitudinal transport barriers. This implies a potential limitation in the high‐latitude aerosol burden and subsequent cooling.