Revisiting the Sulfur‐Water Chemical System in the Middle Atmosphere of Venus
Revisiting the Sulfur‐Water Chemical System in the Middle Atmosphere of Venus
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重新审视金星中层大气中的硫-水化学系统
DOI：
10.1029/2019je006195
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Encrenaz, Therese
中科院分区：
文献类型：
--
作者：
Shao, Wencheng D.;Zhang, Xi;Bierson, Carver J.;Encrenaz, Therese
硫-水化学在金星的中层大气中起着重要的作用。地面观测发现，在64公里处同时观测到的SO2和H2O随时间变化，并且在时间上是相关的。为了理解这些观察结果，我们使用一维化学扩散模型探索了硫-水化学系统。我们发现，SO2和H2O的混合比以上的云是高度依赖于这两个物种在中间云顶（58公里）的混合比。硫-水化学体系的行为可分为三个区，但各区之间不存在突变。特别地，不存在如先前所声称的分叉行为。我们还发现，SO2自屏蔽效应导致云上方的H2O以非单调的方式响应于中间云顶。通过与观测资料的比较，我们发现，在云顶中部混合比的变化可以解释观测到的SO2和H2O的变化。中层大气中的硫-水化学是造成64公里处H2O-SO2关系的原因。涡动输运的变化不能单独解释这两个物种的变化。这些结果表明，低层大气过程对中层大气物种丰度的变化有显著的影响。继续对云层上方SO2和H2O的共同演化进行地面测量以及新的航天器任务对于揭示金星低层大气、云层和中层大气之间相互作用的复杂过程至关重要。
Sulfur‐water chemistry plays an important role in the middle atmosphere of Venus. Ground‐based observations have found that simultaneously observed SO2and H2O at ~64 km vary with time and are temporally anticorrelated. To understand these observations, we explore the sulfur‐water chemical system using a one‐dimensional chemistry‐diffusion model. We find that SO2and H2O mixing ratios above the clouds are highly dependent on mixing ratios of the two species at the middle cloud top (58 km). The behavior of sulfur‐water chemical system can be classified into three regimes, but there is no abrupt transition among these regimes. In particular, there is no bifurcation behavior as previously claimed. We also find that the SO2self‐shielding effect causes H2O above the clouds to respond to the middle cloud top in a nonmonotonic fashion. Through comparison with observations, we find that mixing ratio variations at the middle cloud top can explain the observed variability of SO2and H2O. The sulfur‐water chemistry in the middle atmosphere is responsible for the H2O‐SO2anticorrelation at 64 km. Eddy transport change alone cannot explain the variations of both species. These results imply that variations of species abundance in the middle atmosphere are significantly influenced by the lower atmospheric processes. Continued ground‐based measurements of the coevolution of SO2and H2O above the clouds and new spacecraft missions will be crucial for uncovering the complicated processes underlying the interaction among the lower atmosphere, the clouds, and the middle atmosphere of Venus.
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DOI：
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发表时间：
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期刊：
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