Impact of the Latitude of Stratospheric Aerosol Injection on the Southern Annular Mode

Impact of the Latitude of Stratospheric Aerosol Injection on the Southern Annular Mode
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平流层气溶胶注入纬度对南环模态的影响

DOI:
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发表时间:
2022
影响因子:
5.2
通讯作者:
D. MacMartin
D. MacMartin
中科院分区:
地球科学1区
文献类型:
--
作者:
E. Bednarz;D. Visioni;J. Richter;A. Butler;D. MacMartin

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利用共同体地球系统模式分析了平流层气溶胶注入(SAI)策略对南半球环形模(SAM)的影响。使用一组模拟与固定的单点SO2注入,我们证明了SAM响应的一阶依赖于注入的纬度,与北方半球和赤道注入驱动对应于SAM的正相和南半球注入驱动SAM的负相的响应。我们进一步证明,结果可以一阶解释SAM响应的差异诊断从两个最近的大型合奏的地球工程模拟利用更复杂的注入战略-地球工程大包围和评估响应和影响的太阳气候干预对地球系统与平流层气溶胶注入(GLENS和ARISE‐SAI)-由模拟硫酸盐气溶胶分布的差异驱动。我们的研究结果指出,气溶胶引起的平流层下部加热的范围是SAM响应对注入位置的敏感性的重要驱动因素。
The impacts of Stratospheric Aerosol Injection (SAI) strategies on the Southern Annular Mode (SAM) are analyzed with the Community Earth System Model. Using a set of simulations with fixed single‐point SO2 injections we demonstrate the first‐order dependence of the SAM response on the latitude of injection, with the northern hemispheric and equatorial injections driving a response corresponding to a positive phase of SAM and the southern hemispheric injections driving a negative phase of SAM. We further demonstrate that the results can to first order explain the differences in the SAM responses diagnosed from the two recent large ensembles of geoengineering simulations utilizing more complex injection strategies – Geoengineering Large Ensemble and Assessing Responses and Impacts of Solar climate intervention on the Earth system with Stratospheric Aerosol Injection (GLENS and ARISE‐SAI) – as driven by the differences in the simulated sulfate aerosol distributions. Our results point to the meridional extent of aerosol‐induced lower stratospheric heating as an important driver of the sensitivity of the SAM response to the injection location.
地球工程模型比对项目(GeoMIP)G6硫实验中平流层气溶胶干预对北大西洋和准两年期振荡的影响
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