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| Titel |
Simulation of the atmospheric tape recorder signal in HCN |
| VerfasserIn |
R. Walter, R. Müller, J.-U. Grooß, P. Konopka, G. Günther, A. Heil, M. Schultz, H.-C. Pumphrey, M. Riese |
| 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 |
250022556
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| Zusammenfassung |
| Variations in the mixing ratio of long-lived trace gases entering the stratosphere in the tropics
are carried upward with the rising air with the signal being observable throughout the tropical
lower stratosphere. This phenomenon is referred to as “atmospheric tape recorder”. The tape
recorder phenomenon has been observed for water vapour, for CO2, and for CO; for
all three trace gases, the cycle repeats every year. Recently, based on Microwave
Limb Sounder (MLS) and Atmospheric Chemistry Experiment (ACE) satellite
measurements, a tape recorder signal has been reported for HCN but with an approximately
two year period. Here we report results of a model simulation of the HCN tape
recorder for the time period 2005–2008 using the Chemical Lagrangian Model
of the Stratosphere (CLaMS). We find that the observed pattern of the HCN tape
recorder signal can be reproduced by a model simulation using only emissions
from Indonesian fires as boundary conditions at the ground. This finding supports
the notion that inter-annual variations in biomass burning in Indonesia, which are
strongly influenced by El Ni |
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