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| Titel |
Simulation of the atmospheric tape recorder signal in HCN |
| VerfasserIn |
Robert Pommrich, Jens-Uwe Grooß, Gebhard Günther, Paul Konopka, Rolf Müller, Martin Riese, Angelika Heil, Martin Schultz, Hugh Pumphrey, Kaley Walker |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250037189
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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”.
It has previously been observed for water vapor, CO2, and CO which exhibit an
annual cycle. Recently, based on Microwave Limb Sounder (MLS) and Atmospheric
Chemistry Experiment (ACE) satellite measurements, the tape recorder signal has been
observed for hydrogen cyanide (HCN) but with an approximately two-year period.
Here we report on a model simulation of the HCN tape recorder for the time period
2002–2008 using the Chemical Lagrangian Model of the Stratosphere (CLaMS). The
model is able to reproduce the observed pattern of the HCN tape recorder signal if
time-resolved emissions from fires in Indonesia are used as lower boundary conditions. This
finding indicates that inter-annual variations in biomass burning in Indonesia, which
are strongly influenced by El Niño events, control the HCN tape recorder signal. |
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