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| Titel |
Measured and modelled variabilities of long-lived species over the Mediterranean Basin |
| VerfasserIn |
Philippe Ricaud, Jean-Luc Attié, Laaziz El Amraoui, Vincent-Henri Peuch, Thomas August, Juying Warner |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250051871
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| Zusammenfassung |
| The Mediterranean Basin (MB) is of particular interest in terms of pollution sources as it is at
the confluence of three continents, Europe, Africa and Asia. The impact of these varied
continental sources (industrial and populated coastal cities, forest fires, etc.) is still not well
understood especially on the O3 and CO budgets. Within the Chemistry-Aerosol
Mediterranean Experiment (CHARMEX) Project, a particular attention is given to the
variabilities and recent trends in chemical species and aerosols over the MB in order to study
the weight of different processes (long-range transport, emissions, import/export, chemical
transformation) on the budgets of these species. The present contribution deals with the time
evolution of medium- to long-lived species (N2O, CO, CH4 and CO2) as measured by the
nadir-viewing Infrared Atmospheric Sounding Interferometer (IASI) instrument aboard the
MetOp-A platform over the MB from 2008 to 2010 and how it compares with the 3D
Chemical Transport Model (CTM) MOCAGE outputs (CO2 not yet included).
The Atmospheric Infrared Sounder (AIRS) sensor aboard the AQUA platform will
also be used to diagnose CO and CH4 evolutions. As expected, a great variability
is measured for CO and eventually CH4, but the N2O and CO2 variabilities are
also found to be non negligible. Furthermore, an Eastern-Western difference is
measured within all the observed data sets for the four species, highlighting the
different physico-chemical regimes occurring in the Eastern and Western parts
of the MB. Finally, although the CTM has some great difficulties to mimic the
variabilities observed over the MB, it obviously tracks the seasonal variation of the
East-West difference in N2O, CO and CH4 as measured by the spaceborne sensors. |
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