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THE CHAMBER CONFIGURATION IMPACT ON SOIL FLUX PRECISION USING CAVITY RING-DOWN SPECTROSCOPY

Olga Frolova

First published: 2018-06-20https://doi.org/10.5593/sgem2018/4.2/s19.080View metrics

Abstract

The Greenhouse gas (GHG) emission reduction is one of goals of environmental policy in climate change context. The accuracy of Soil flux measurements is one of scientific challenges during last decades. The soil flux measurement methodology using gas chromatography is described and commonly used. However cavity ring down spectroscopy is relatively new technology and there is need to research optimal chamber configuration and measurement time. The aim of this study is to evaluate three types of static chamber configurations: with air compensation tube, with air circulation gap and without air compensation. To limit sunlight impact chambers were covered. Measurements were done during one day period in the same research plot changing only chamber configuration with Picarro G2508 cavity ring ? down spectrometer. Research plot is non-agricultural grassland without nitrogen input on mineral soil resulting low concentration measurements. Statistical analyses were done for the concentration fluctuations slope of three gasses CO2, N2O and CH4 using linear regression and determination coefficient graphical analyse. Analyse of results show that there is differences of soil flux results between chamber configurations. The chamber configuration with air compensation tube show more stable soil flux results.

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Publication details

Title
THE CHAMBER CONFIGURATION IMPACT ON SOIL FLUX PRECISION USING CAVITY RING-DOWN SPECTROSCOPY
Authors
Olga Frolova
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Energy and Clean Technologies
Publisher
STEF92 Technology
Year
2018
Pages
623-630
SWS Citekey
Frolova201819623630
ISSN
1314-2704
ISBN
978-619-7408-45-4
Language
en
Publication type
Conference Paper
Keywords
soil fluxring-down spectroscopygreenhouse gaseschamber configuration
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