The impact of anthropogenic chlorine emissions, stratospheric ozone change and chemical feedbacks on stratospheric water
Item
Title (Dublin Core)
The impact of anthropogenic chlorine emissions, stratospheric ozone change and chemical feedbacks on stratospheric water
Description (Dublin Core)
Mixing ratios of water (H<sub>2</sub>O) in the stratosphere appear to increase due to increased input of H<sub>2</sub>O and methane from the troposphere and due to intensified oxidation of CH<sub>4</sub> in the stratosphere, but many of the underlying mechanisms are not yet understood. Here we identify and quantify three chemical mechanisms which must have led to more efficient oxidation of CH<sub>4</sub> in the stratosphere over the past several decades: 1) The increase in stratospheric chlorine levels due to anthropogenic CFC emissions, 2) the thinning of the stratospheric ozone column and 3) enhanced OH levels in the stratosphere due to increasing H<sub>2</sub>O levels themselves. In combination with the increase in tropospheric CH<sub>4</sub> mixing ratios and with solar cycle related variations of upper stratospheric ozone, these effects can explain about 50% of the additional conversion of CH<sub>4</sub> to H<sub>2</sub>O as observed throughout the stratosphere. The relative contributions from the individual processes have varied over the past decades.
Creator (Dublin Core)
Röckmann, T.
Grooß, J.-U.
Müller, R.
Date (Dublin Core)
2018-06-28
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-4-693-2004
https://acp.copernicus.org/articles/4/693/2004/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
