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| Titel |
Model simulations of stratospheric ozone loss caused by enhanced H2O due to increased H2 emissions during the Arctic winter 2004/2005 |
| VerfasserIn |
B. Vogel, T. Feck, J.-U. Grooß |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022554
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| Zusammenfassung |
| Stratospheric simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS)
were performed within the EUROHYDROS project to study the impact of potential future
stratospheric H2O increases due to potentially increased H2 emissions during the Arctic
winter 2004/2005. For that, full hydrogen-relevant chemistry was incorporated into the
model. First, box model studies for a single ascending air parcel in the tropical stratosphere
were used to estimate the oxidation of H2 and CH4 and the inferred additional
H2O production from potential increased H2 emissions. This study is based on
four H2 scenarios that reflect the ongoing discussion about the potential increase
of atmospheric H2 due to leakages caused by a future hydrogen economy. In our
study we use the H2 scenario with the highest additional amount of H2O up to 0.56
ppmv for Arctic winter conditions. It has been asserted that this case is unrealistic
due to the high leakage rate assumption, nevertheless in our studies this case is
used as upper limit to calculate the expected future maximum ozone loss caused by
enhanced H2O due to increased H2 emissions. We compare simulated ozone loss for
the Arctic winter 2004/2005 which shows a very good agreement with satellite
measurements to simulated ozone loss with enhanced stratospheric H2O values. Locally
up to 6 – 7% more ozone loss is deduced in the simulations with enhanced H2O
mixing ratios and up to approximately 7 DU higher ozone loss for the Arctic polar
winter 2004/2005. This case is a clear upper limit of future potential ozone loss
caused by increasing H2O values due to H2 emissions. However, enhanced H2O
values have also an impact on the radiative forcing of the atmosphere, therefore the
decrease in temperature will be also considered. Overall, increasing H2 emissions
due to leakages caused by a future hydrogen economy is an additional variability |
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