Weakening of the Extratropical Storm Tracks in Solar Geoengineering Scenarios
Weakening of the Extratropical Storm Tracks in Solar Geoengineering Scenarios
复制标题
DOI：
10.1029/2020gl087348
复制
发表时间：
2020-06-16
影响因子：
5.2
通讯作者：
Watanabe, Shingo
中科院分区：
文献类型：
--
作者：
Gertler, Charles G.;O'Gorman, Paul A.;Watanabe, Shingo
然而，旨在抵消全球变暖的太阳地球工程可能会改变大气温度梯度和湿度，从而影响热带风暴的轨迹。在这里，我们首先分析了地球工程模型比较项目实验G1的气候模型模拟，其中入射太阳辐射的减少平衡了二氧化碳的四倍。北方半球温带风暴轴在G1中减弱的程度与仅在CO（2）增加时相当。南半球风暴轴在G1中也减弱，与CO2增加的加强和向极移动相反。利用平均有效位能，我们发现纬向平均温度和湿度的变化足以解释风暴轴强度的不同响应。我们还证明了类似的削弱在一个更复杂的地球工程方案。我们的研究结果提供了深入了解地球工程如何影响风暴轨迹，突出了地球工程引发新的气候变化的潜力。
Solar geoengineering that aims to offset global warming could nonetheless alter atmospheric temperature gradients and humidity and thus affect the extratropical storm tracks. Here, we first analyze climate model simulations from experiment G1 of the Geoengineering Model Intercomparison Project, in which a reduction in incoming solar radiation balances a quadrupling of CO2. The Northern Hemisphere extratropical storm track weakens by a comparable amount in G1 as it does for increased CO(2)only. The Southern Hemisphere storm track also weakens in G1, in contrast to a strengthening and poleward shift for increased CO2. Using mean available potential energy, we show that the changes in zonal-mean temperature and humidity are sufficient to explain the different responses of storm-track intensity. We also demonstrate similar weakening in a more complex geoengineering scenario. Our results offer insight into how geoengineering affects storm tracks, highlighting the potential for geoengineering to induce novel climate changes.