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| Titel |
Airborne Observations of Greenhouse Gases during the Asian Summer Monsoon 2008 |
| VerfasserIn |
T. J. Schuck, C. A. M. Brenninkmeijer, F. Slemr, P. F. J. van Velthoven, A. Zahn |
| 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 |
250029973
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| Zusammenfassung |
| The new CARIBIC system (Civil Aircraft for the Regular Investigation of the Atmosphere
Based on an Instrument Container) is operational since December 2004. The fully
automated instrument package is deployed monthly aboard a Lufthansa Airbus
A340-600. The measurement results are representative for the extra-tropical UT/LS
and for tropical free-troposphere air masses. Besides in-situ measurements, air
is sampled into glass flasks for laboratory analyses (greenhouse gases, NMHCs,
halocarbons, CO2 and H2 isotopes). The main greenhouse gas analysis comprises CO2,
CH4, N2O and SF6, isotope analyses include 13C(CO2), 18O(CO2), D(H2) and
13C(CH4).
In 2008 the emphasis was on flights between Germany and India in order to study the
influence of the Asian summer monsoon on the upper troposphere. During the summer
months a distinctive monsoon plume was observed.
Higher levels of CH4, N2O and SF6 were found in air masses influenced by the
monsoon. While the increase of the purely anthropogenic SF6 is due to increased
convective transport during the summer months, the enhancement of CH4 and to a lesser
extent also of N2O is caused by increasing emissions from rice paddies, wetlands
and landfills during the rainy season. In contrast, CO2 is depleted in the monsoon
plume due to an increase in photosynthesis in the regions affected by the monsoon
rains.
The observations made in 2008 will be compared to data from the phase I of the
CARIBIC project. |
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