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| Titel |
A statistical evaluation of NO2 long-range transport events using GOME-2 observations |
| VerfasserIn |
Achim Zien, Andreas Richter, Andreas Hilboll, John P. Burrows |
| 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 |
250046112
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| Zusammenfassung |
| Long-range transport events in the atmosphere have the potential to relocate trace gases from
emitting to downwind regions on an intercontinental scale, thus yielding the potential of
drastically altering atmospheric chemistry in remote regions. The characteristics of such
transport events are influenced by meteorological conditions, source strength and life-time of
the particular trace gas species in the lower atmosphere.
Remote sensing satellite instruments allow for a thorough investigation of this
phenomenon. Their spatial and temporal coverage allows in-depth analysis not only of
individual transported plumes, but also the evaluation of global statistics of frequencies,
amplitudes and routes of such events.
Using measurements of NO2 columns from the GOME-2 instrument, we show that
long-range transport events are not a rare phenomenon. They are, however, often associated
with clouds which complicates quantitative retrievals as the presence of clouds strongly alters
the radiative transfer in the atmosphere. Therefore, most current satellite tropospheric
products exclude cloudy measurements.
Here, we utilize image analysis on daily GOME-2 measurements to identify transported
NO2 from 2007 to 2009 in several regions of the world. A strong seasonality can be seen in
both the transport routes and the intensity of transport events. For a semi-quantitative
analysis, we investigate the frequency and typical transport mass of NO2 of the
plumes. Also, we discuss the peculiarities of satellite measurements of trace gases in
long-range transports, which are often associated with clouds and vertical transport. |
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