Evidence for carbonyl sulfide (OCS) conversion to CO in the lower atmosphere of Venus

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题名:	Evidence for carbonyl sulfide (OCS) conversion to CO in the lower atmosphere of Venus
作者:	Yung,YL;Liang,MC;Jiang,X;Shia,RL;Lee,C;Bezard,B;Marcq,E
贡献者:	天文研究所
关键词:	LATITUDINAL VARIATIONS;SULFUR;MODEL;PHOTOCHEMISTRY;STRATOSPHERE;CLOUDS;SPECTROSCOPY;ABSORPTION;MESOSPHERE;CHEMISTRY
日期:	2009
上传时间:	2010-06-29 19:34:34 (UTC+8)
出版者:	中央大學
摘要:	The chemical regimes in the atmosphere of Venus vary from photochemistry in the middle atmosphere to thermal equilibrium chemistry in the lower atmosphere and the surface. Many chemical cycles have been proposed, but few details about these cycles are fully verified by comparison between observations and modeling. Recent high-quality data of carbonyl sulfide (OCS) and CO from ground-based and Venus Express observations provide a unique opportunity to test our understanding of chemistry and transport in the lower atmosphere of Venus. The spatial distributions of OCS and CO in the atmosphere reflect a sensitive balance between chemistry and transport. On the basis of our updated photochemical model and winds from Lee et al.'s (2007) general circulation model, we study the chemistry and transport in a simplified two-dimensional chemistry-transport model. OCS is produced by heterogeneous reactions on the surface; the middle atmosphere is a net sink for OCS. The combination of data and modeling provides strong evidence for the loss of OCS by conversion to CO. The detailed chemical mechanism is currently unknown, although a number of speculations have been proposed. The sensitivity of the distributions of OCS and CO to model parameters is reported.
關聯:	JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
显示于类别:	[天文研究所] 期刊論文

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