Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands
For a quantification of the natural GHG budget of the atmosphere the emission of methane from the vast arctic wetlands need to be assessed accurately. The conventional methods of flux measurements made by closed chambers and eddy towers need to be upscaled, introducing a potentially large source of...
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EGU General Assembly 2012
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ftawi:oai:epic.awi.de:30562 2023-05-15T14:58:37+02:00 Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands Hartmann, Jörg Sachs, Torsten 2012-04-23 application/pdf https://epic.awi.de/id/eprint/30562/ https://epic.awi.de/id/eprint/30562/1/EGU2012-2382.pdf https://hdl.handle.net/10013/epic.39536 https://hdl.handle.net/10013/epic.39536.d001 unknown EGU General Assembly 2012 https://epic.awi.de/id/eprint/30562/1/EGU2012-2382.pdf https://hdl.handle.net/10013/epic.39536.d001 Hartmann, J. and Sachs, T. (2012) Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands , EGU General Assembly 2012, Wien, 23 April 2012 - unspecified . hdl:10013/epic.39536 EPIC3EGU General Assembly 2012, Wien, 2012-04-23Wien, EGU General Assembly 2012 Conference notRev 2012 ftawi 2021-12-24T15:37:46Z For a quantification of the natural GHG budget of the atmosphere the emission of methane from the vast arctic wetlands need to be assessed accurately. The conventional methods of flux measurements made by closed chambers and eddy towers need to be upscaled, introducing a potentially large source of uncertainty, due to the heterogeneity of the emitting sources at the surface. In order to obtain a large area coverage and thus a higher spacial representativeness we performed airborne measurements of methane fluxes over mid-latitude and sub-arctic wetlands, for flight legs of tens of kilometres length. We installed a fast trace gas analyser, a Los Gatos RMT200, in the research aircraft Polar 5, together with the noseboom mounted turbulence sensor package. Measurement flights have been carried out in June 2011 over wetlands in Germany and in northern Finland in a convectively mixed boundary layer. Reference data have been optained at the surface by tower mounted eddy correlation measurements. A spectral analysis of the first measurements shows that the system is well suitable to measure the vertical flux of methane from natural surfaces transported by the dominating eddies in the convective boundary layer. Our flux measurements compare well to those obtained at the surface. On the high-frequency end of the spectrum the measurement accuracy is not sufficient to resolve the inertial subrange. Conference Object Arctic Northern Finland Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
For a quantification of the natural GHG budget of the atmosphere the emission of methane from the vast arctic wetlands need to be assessed accurately. The conventional methods of flux measurements made by closed chambers and eddy towers need to be upscaled, introducing a potentially large source of uncertainty, due to the heterogeneity of the emitting sources at the surface. In order to obtain a large area coverage and thus a higher spacial representativeness we performed airborne measurements of methane fluxes over mid-latitude and sub-arctic wetlands, for flight legs of tens of kilometres length. We installed a fast trace gas analyser, a Los Gatos RMT200, in the research aircraft Polar 5, together with the noseboom mounted turbulence sensor package. Measurement flights have been carried out in June 2011 over wetlands in Germany and in northern Finland in a convectively mixed boundary layer. Reference data have been optained at the surface by tower mounted eddy correlation measurements. A spectral analysis of the first measurements shows that the system is well suitable to measure the vertical flux of methane from natural surfaces transported by the dominating eddies in the convective boundary layer. Our flux measurements compare well to those obtained at the surface. On the high-frequency end of the spectrum the measurement accuracy is not sufficient to resolve the inertial subrange. |
format |
Conference Object |
author |
Hartmann, Jörg Sachs, Torsten |
spellingShingle |
Hartmann, Jörg Sachs, Torsten Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands |
author_facet |
Hartmann, Jörg Sachs, Torsten |
author_sort |
Hartmann, Jörg |
title |
Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands |
title_short |
Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands |
title_full |
Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands |
title_fullStr |
Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands |
title_full_unstemmed |
Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands |
title_sort |
airborne measurements of methane fluxes over mid-latitude and sub-arcticwetlands |
publisher |
EGU General Assembly 2012 |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/30562/ https://epic.awi.de/id/eprint/30562/1/EGU2012-2382.pdf https://hdl.handle.net/10013/epic.39536 https://hdl.handle.net/10013/epic.39536.d001 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Northern Finland |
genre_facet |
Arctic Northern Finland |
op_source |
EPIC3EGU General Assembly 2012, Wien, 2012-04-23Wien, EGU General Assembly 2012 |
op_relation |
https://epic.awi.de/id/eprint/30562/1/EGU2012-2382.pdf https://hdl.handle.net/10013/epic.39536.d001 Hartmann, J. and Sachs, T. (2012) Airborne Measurements of Methane Fluxes over Mid-Latitude and Sub-ArcticWetlands , EGU General Assembly 2012, Wien, 23 April 2012 - unspecified . hdl:10013/epic.39536 |
_version_ |
1766330748534521856 |