Differing responses of the quasi-biennial oscillation to artificial SO2 injections in two global models
Differing responses of the quasi-biennial oscillation to artificial SO2 injections in two global models
复制标题
两个全球模型中准两年期振荡对人工 SO2 注入的不同响应
DOI：
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
S. Tilmes
中科院分区：
文献类型：
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作者：
U. Niemeier;J. Richter;S. Tilmes
抽象。在几个模型研究中，向平流层人工注入二氧化硫（SO2）对平流层动力学产生了影响。在赤道地区，准两年振荡（QBO）已被证明在较高的SO2注入下减缓甚至消失。但是，在使用不同数值模型的不同研究中，这种影响只是定性的，而不是定量的。本研究的目的是了解两个大气环流模式，全大气社区气候模式（WACCM-110 L）和MAECHAM 5-HAM之间的差异，在QBO响应SO2注入背后的原因。我们表明，响应的QBO注入具有相同的SO2注入速率是非常不同的两个模型，但类似的平流层加热速率时，引起的SO2注入量不同。相同注入速率下QBO响应不同的原因是两种模式中的垂直平流有很大不同，即使在控制模拟中也是如此。WACCM中较强的垂直平流导致更高的气溶胶负荷和更强的气溶胶加热，因此，在较低的注入速率下，QBO比MAECHAM 5-HAM模拟中消失。当水平分辨率增加时，MAECHAM 5-HAM中的垂直速度略有增加。这项研究突出了动力过程的关键作用，并有助于理解气候工程研究中不同模型对人工SO2注入的响应存在很大的不确定性。
Abstract. Artificial injections of sulfur dioxide ( SO2 ) into the stratosphere show in several model studies an impact on stratospheric dynamics. The quasi-biennial oscillation (QBO) has been shown to slow down or even vanish under higher SO2 injections in the equatorial region. But the impact is only qualitatively but not quantitatively consistent across the different studies using different numerical models. The aim of this study is to understand the reasons behind the differences in the QBO response to SO2 injections between two general circulation models, the Whole Atmosphere Community Climate Model (WACCM-110L) and MAECHAM5-HAM. We show that the response of the QBO to injections with the same SO2 injection rate is very different in the two models, but similar when a similar stratospheric heating rate is induced by SO2 injections of different amounts. The reason for the different response of the QBO corresponding to the same injection rate is very different vertical advection in the two models, even in the control simulation. The stronger vertical advection in WACCM results in a higher aerosol burden and stronger heating of the aerosols and, consequently, in a vanishing QBO at lower injection rate than in simulations with MAECHAM5-HAM. The vertical velocity increases slightly in MAECHAM5-HAM when increasing the horizontal resolution. This study highlights the crucial role of dynamical processes and helps to understand the large uncertainties in the response of different models to artificial SO2 injections in climate engineering studies.
影响因子：
6.3
作者：
U. Niemeier;C. Timmreck
通讯作者：
U. Niemeier;C. Timmreck
1815 年坦博拉山喷发后火山硫酸盐沉积的多模型比较
影响因子：
6.3
作者：
Marshall;Schmidt;Toohey;Carslaw;Khodri;Timmreck;Zanchettin;Brooke;Dhomse;Johnson;Lamarque;Legrande;Niemeier
通讯作者：
Niemeier
通过硫酸盐气溶胶的辐射加热改变平流层的传输过程
影响因子：
6.3
作者：
Niemeier;Ulrike;Hauke Schmidt
通讯作者：
Hauke Schmidt