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| Titel |
Ship-based MAX-DOAS measurements of nitrogen dioxide in the South China Sea |
| VerfasserIn |
Stefan F. Schreier, Enno Peters, Andreas Richter, Folkard Wittrock, John P. Burrows |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089148
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| Publikation (Nr.) |
 EGU/EGU2014-3340.pdf |
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| Zusammenfassung |
| In November 2011, the SHIVA-Sonne campaign took place in the South China Sea in order to
investigate the transport of very short-lived substances to the stratosphere for a better
understanding of their role in ozone depletion. Among other instruments, a Multi-Axis
Differential Optical Absorption Spectroscopy (MAX-DOAS) instrument was placed on board
the RV Sonne to measure scattered sunlight at different elevation angles. These
measurements can be used for the retrieval of vertical columns of several trace gases (e.g.
nitrogen dioxide (NO2), formaldehyde (HCHO), and iodine monoxide (IO)) by applying the
DOAS method.
In this study, we present tropospheric NO2 vertical columns (TVC NO2) retrieved from the
MAX-DOAS measurements between 17 and 28 November 2011. During this period, the
tropospheric NO2 levels were rather low (< 1 x 1015 molec cm-2) in the open sea most of the
time. However, elevated NO2 levels (> 5 x 1015 molec cm-2) were observed when other
large vessels navigated in the proximity of RV Sonne. Moreover, elevated levels of TVC NO2
(> 3 x 1015 molec cm-2) were also observed close to the coast of the island Borneo. The
web-based version of the Hybrid Single Particle Lagrangian Integrated Trajectory
Model (HYSPLIT) was used for the calculation of 24 h backward trajectories to
better identify the sources of these elevated levels of TVC NO2. The analysis of the
backward trajectories indicated that some cases with elevated tropospheric NO2 levels
could be the result of NO2 transport from biomass burning and urban/industrial
sources.
In summary, the highest levels of TVC NO2 were found to be the result of the combustion
process of large vessel engines. The contribution of biomass burning and urban/industrial
sources to the tropospheric NO2 level in the South China Sea is rather low, at least during this
part of the season. |
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