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Burns, Sean P. ; Delany, Anthony C. ; Sun, Jielun ; Stephens, Britton B. ; Oncley, Stephen P. ; Maclean, Gordon D. ; Semmer, Steven R. ; Schröter, Joel ; Ruppert, Johannes:
An Evaluation of Calibration Techniques for In Situ Carbon Dioxide Measurements Using a Programmable Portable Trace-Gas Measuring System.
In: Journal of Atmospheric and Oceanic Technology.
Bd. 26
(2009)
Heft 2
.
- S. 291-316.
ISSN 1520-0426
DOI: https://doi.org/10.1175/2008JTECHA1080.1
Abstract
The construction and deployment of a portable trace-gas measurement system (TGaMS) is described. The air-collection system (dubbed HYDRA) collects air samples from 18 different locations and was connected to either one or two LI-COR LI-7000 gas analyzers to measure CO₂. An in situ “field calibration” method, that uses four calibration gases with an uncertainty on the order of ±0.1 µmol mol⁻¹ relative to the WMO CO₂ mole fraction scale, revealed CO₂ output from the LI-7000 had a slightly nonlinear relationship relative to the CO₂ concentration of the calibration gases. The sensitivity of the field-calibrated CO2 to different forms of the field-calibration equation is investigated. To evaluate TGaMS performance, CO₂ from collocated inlets, portable gas cylinders, and nearby independent CO₂ instruments are compared. Results are as follows: 1) CO₂ measurements from HYDRA multiple inlets are feasible with a reproducibility of ±0.4 µmol mol⁻¹ (based on the standard deviation of the CO₂ difference between collocated inlets when HYDRA was operating with two LI-7000s); 2) CO₂ differences among the various field-calibration equations were on the order of ±0.3 µmol mol⁻¹; and 3) comparison of midday hourly CO₂ measurements at 30 m AGL between TGaMS and an independent high-accuracy CO₂ measurement system (within 300 m of TGaMS) had a median difference and standard deviation of 0.04 ± 0.81 µmol mol⁻¹ over two months.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER68859 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Mikrometeorologie Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 21 Aug 2015 06:49 |
| Letzte Änderung: | 29 Jun 2022 11:51 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/18437 |