Non‐additive response of the high‐latitude Southern Hemisphere climate to aerosol forcing in a climate model with interactive chemistry,Atmospheric Science Letters

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Non‐additive response of the high‐latitude Southern Hemisphere climate to aerosol forcing in a climate model with interactive chemistry
Atmospheric Science Letters ( IF 2.0 ) Pub Date : 2020-07-08 , DOI: 10.1002/asl.1004
James O. Pope _{1,

2} , Andrew Orr ₁ , Gareth J. Marshall ₁ , Nathan Luke Abraham _{3,

4}

Affiliation

A suite of chemistry‐climate model simulations, forced by pairs of anthropogenic forcings [comprising greenhouse gases (GHGs), ozone depleting substances (ODSs), or aerosols], were employed to investigate whether the high‐latitude Southern Hemisphere (SH) circulation response to these forcings is linearly additive, a common assumption in attribution studies. We find that the geographical pattern of sea‐level pressure (SLP) response to a combination of GHGs and ODSs is linearly additive. However, we find significant differences in the SLP response when combining GHGs and aerosols compared to the sum of the individual forcings, a non‐additivity that is currently masked by the dominance of the ODSs forcing. This non‐linearity also results in changes to the SH split jet. These results were obtained using a coupled chemistry‐climate model, indicating that the non‐linear response is due to chemical interactions between the forcing agents. As such, future simulations investigating a post‐ozone hole Southern Hemisphere climate should consider this chemical interaction.

中文翻译：

在具有交互化学作用的气候模型中，高纬度南半球气候对气溶胶强迫的非加性响应

通过一对人为强迫[包括温室气体（GHG），消耗臭氧层的物质（ODS）或气溶胶]强迫进行的化学-气候模型模拟，用于研究高纬度南半球（SH）的循环响应这些强迫因素是线性相加的，这是归因研究中的一个常见假设。我们发现，对GHG和ODS组合的海平面压力（SLP）响应的地理格局是线性累加的。但是，与单个强迫的总和相比，我们发现将温室气体和气溶胶组合在一起时，SLP响应存在显着差异，这种非可加性目前已被ODSs强迫的优势所掩盖。这种非线性也会导致SH分离射流发生变化。这些结果是使用化学-气候耦合模型获得的，表明非线性响应是由于强迫剂之间的化学相互作用。因此，在调查臭氧后洞南半球气候的未来模拟中应考虑这种化学相互作用。

更新日期：2020-07-08

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