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The importance of interactive chemistry for stratosphere-troposphere coupling

机译:互动化学对平流层 - 对流层耦合的重要性

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Recent observational and modeling studies suggest that stratospheric ozone depletion not only influences the surface climate in the Southern Hemisphere (SH), but also impacts Northern Hemisphere (NH) spring, which implies a strong interaction between dynamics and chemistry. Here, we systematically analyze the importance of interactive chemistry with respect to the representation of stratosphere-troposphere coupling and in particular the effects on NH surface climate during the recent past. We use the interactive and specified chemistry version of NCAR's Whole Atmosphere Community Climate Model coupled to an ocean model to investigate differences in the mean state of the NH stratosphere as well as in stratospheric extreme events, namely sudden stratospheric warmings (SSWs), and their surface impacts. To be able to focus on differences that arise from two-way interactions between chemistry and dynamics in the model, the specified chemistry model version uses a time-evolving, model-consistent ozone field generated by the interactive chemistry model version. We also test the effects of zonally symmetric versus asymmetric prescribed ozone, evaluating the importance of ozone waves in the representation of stratospheric mean state and variability.
机译:最近的观察和建模研究表明,平流层臭氧消耗不仅影响南半球(SH)的表面气候,而且影响北半球(NH)春季,这意味着动态和化学之间的强烈相互作用。在这里,我们系统地分析了交互式化学对近期平流层 - 对流层偶联的表示的重要性,特别是近期NH表面气候的影响。我们使用NCAR的整个大气社区气候模型的互动和指定化学版耦合到海洋模型,以研究NH平流层和平流层极端事件的平均状态的差异,即突然的平流层暖温(SSW)及其表面影响。为了能够专注于在模型中的化学和动态之间的双向相互作用中产生的差异,所指定的化学模型版本使用由交互式化学模型版本生成的时间不断变化的模型一致的臭氧字段。我们还测试了Zonally对称与不对称规定臭氧的影响,评估臭氧波在地段平均状态和变异性表示中的重要性。

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