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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Response of middle atmosphere chemistry and dynamics to volcanically elevated sulfate aerosol: Three-dimensional coupled model simulations
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Response of middle atmosphere chemistry and dynamics to volcanically elevated sulfate aerosol: Three-dimensional coupled model simulations

机译：中层大气化学和动力学对火山升高的硫酸盐气溶胶的响应：三维耦合模型模拟

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The NASA Langley Research Center Interactive Modeling Project for Atmospheric Chemistry and Transport (IMPACT) model has been used to examine the response of the middle atmosphere to a large tropical stratospheric injection of sulfate aerosol, such as that following the June 1991 eruption of Mount Pinatubo. The influence of elevated aerosol on heterogeneous chemical processing was simulated using a three-dimensional climatology of surface area density (SAD) developed using observations made from the Halogen Occultation Experiment, Stratospheric Aerosol and Gas Experiment II, and Stratospheric Aerosol Measurement satellite instruments beginning in June 1991. Radiative effects of the elevated aerosol were represented by monthly mean zonally averaged heating perturbations obtained from a study conducted with the European Center/Hamburg (ECHAM4) general circulation model combined with an observationally derived set of aerosol parameters. Two elevated-aerosol simulations were integrated for 3 1/2 years following the volcanic injection. One simulation included only the aerosol radiative perturbation, and one simulation included both the radiative perturbation and the elevated SAD. These perturbation simulations are compared with multiple-year control simulations to isolate relative contributions of transport and heterogeneous chemical processing. Significance of modeled responses is assessed through comparison with interannual variability. Dynamical and photochemical contributions to ozone decreases are of comparable magnitude. Important stratospheric chemical/dynamical feedback effects are shown, as ozone reductions modulate aerosol-induced heating by up to 10% in the lower stratosphere and 25% in the middle stratosphere. Dynamically induced changes in chemical constituents which propagate into the upper stratosphere are still pronounced at the end of the simulations. [References: 59]
机译：美国宇航局兰利研究中心大气化学和运输互动模型项目（IMPACT）已用于检查中层大气对大型平流层注入硫酸盐气溶胶的响应，例如1991年6月皮纳图博火山爆发后的响应。使用从6月开始进行的卤素掩星实验，平流层气溶胶和气体实验II以及平流层气溶胶测量卫星仪器的观测结果开发的表面积密度（SAD）三维气候学，模拟了气溶胶对异质化学过程的影响。 1991年。升高的气溶胶的辐射作用表示为月平均区域平均摄热扰动，该平均扰动是通过使用欧洲中心/汉堡（ECHAM4）普通环流模型进行的研究与一组观测到的气溶胶参数相结合得出的。在火山注入后的3 1/2年中，对两个高位气溶胶模拟进行了整合。一种模拟仅包括气溶胶辐射扰动，一种模拟既包括辐射扰动又包括升高的SAD。将这些摄动模拟与多年控制模拟进行比较，以分离出运输和异质化学加工的相对贡献。通过与年际变化进行比较来评估建模响应的重要性。减少臭氧的动力学和光化学作用可比。显示了重要的平流层化学/动力反馈效应，因为减少臭氧可调节气溶胶诱导的加热，在低层平流层中最多增加10％，在中层平流层最多增加25％。在模拟结束时，仍会显着传播到平流层上部的化学成分的动态诱导变化。 [参考：59]

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