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Proceedings Paper

Application of open-path spectroscopic measurement techniques (FTIR) for the up-scaling of greenhouse gas emissions from soils
Author(s): Klaus Schäfer; Carsten Jahn; Michael Wiwiorra; Anja Schleichardt; Stefan Emeis; Armin Raabe; Jürgen Böttcher; Nils-Demian Landmeyer; Christoph Bonecke; Marcus Deurer; Carolin von der Heide; Daniel Weymann
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Paper Abstract

The path-averaging, multi-component Fourier Transform Infrared (FTIR) absorption spectrometry at an open path of 100 m length is applied for the up-scaling of greenhouse gas (GHG) flux measurements from soil surfaces. For the detection of the emissions of N2O and further GHG from arable field soils a measuring tunnel for controlled enrichment of released gases was installed at the soil surface covering an area of 495 or 306 m2. The concentrations of GHG were measured by FTIR across the whole measuring tunnel. The precision of the FTIR system is discussed to detect the concentration increases during a time period of up to two hours. During a 2-years-time frame the N2O fluxes between the soil and the atmosphere at the agricultural field varied between 1.0 and 21 μg N2O-N m-2 h-1. A non-intrusive emission and flux measurement method at a scale from 100 m up to 27.000 m2 on the basis of the fluxgradient method (0.50 and 2.70 m height above surface) was developed and tested by means of FTIR (N2O and further GHG concentrations) and area averaging meteorological measurements (determination of horizontal winds and friction velocity using acoustic tomography). To detect the concentration gradient between the two heights the precision of the FTIR system is discussed. Two campaigns in October 2007 and June 2008 were performed with this new methodology when wind speeds were low. The measurement errors are discussed and the results compared with the measurement tunnel results that were higher by up to 25 %.

Paper Details

Date Published: 24 September 2009
PDF: 8 pages
Proc. SPIE 7475, Remote Sensing of Clouds and the Atmosphere XIV, 747511 (24 September 2009); doi: 10.1117/12.830434
Show Author Affiliations
Klaus Schäfer, Forschungszentrum Karlsruhe GmbH (Germany)
Carsten Jahn, Forschungszentrum Karlsruhe GmbH (Germany)
Michael Wiwiorra, Univ. of Hannover (Germany)
Anja Schleichardt, Univ. of Leipzig (Germany)
Stefan Emeis, Forschungszentrum Karlsruhe GmbH (Germany)
Armin Raabe, Univ.of Leipzig (Germany)
Jürgen Böttcher, Univ. of Hannover (Germany)
Nils-Demian Landmeyer, Forschungszentrum Karlsruhe GmbH (Germany)
Christoph Bonecke, Forschungszentrum Karlsruhe GmbH (Germany)
Marcus Deurer, Univ. of Hannover (Germany)
Carolin von der Heide, Univ. of Hannover (Germany)
Daniel Weymann, Univ. of Goettingen (Germany)

Published in SPIE Proceedings Vol. 7475:
Remote Sensing of Clouds and the Atmosphere XIV
Richard H. Picard; Klaus Schäfer; Adolfo Comeron; Evgueni I. Kassianov; Christopher J. Mertens, Editor(s)

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