Measurements of greenhouse gases at Beromünster tall-tower station in Switzerland
| Autor: | H. P. Moret, Markus Leuenberger, Brian Oney, Peter Nyfeler, Dominik Brunner, Tesfaye A. Berhanu, Rudiger Schanda, Ece Satar |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Atmospheric pressure Spectrometer Meteorology lcsh:TA715-787 530 Physics System of measurement lcsh:Earthwork. Foundations Humidity 010501 environmental sciences 01 natural sciences Wind speed Trace gas lcsh:Environmental engineering 13. Climate action Calibration Mixing ratio Environmental science lcsh:TA170-171 550 Earth sciences & geology 0105 earth and related environmental sciences |
| Zdroj: | Berhanu, Tesfaye Ayalneh; Satar, Ece; Schanda, Rudiger; Nyfeler, Peter; Moret, Hanspeter; Brunner, Dominik; Oney, Brian; Leuenberger, Markus (2016). Measurements of greenhouse gases at Beromünster tall-tower station in Switzerland. Atmospheric Measurement Techniques (AMT), 9(6), pp. 2603-2614. Copernicus Publications 10.5194/amt-9-2603-2016 Atmospheric Measurement Techniques Atmospheric Measurement Techniques, Vol 9, Iss 6, Pp 2603-2614 (2016) Atmospheric Measurement Techniques, 9 (6) |
| ISSN: | 1867-8548 |
| DOI: | 10.5194/amt-9-2603-2016 |
| Popis: | In order to constrain the regional flux of greenhouse gases, an automated measurement system was built on an old radio tower at Beromünster, Switzerland. The measurement system has been running since November 2012 as part of the Swiss greenhouse gases monitoring network (CarboCount-CH), which is composed of four measurement sites across the country. The Beromünster tall tower has five sampling lines with inlets at 12.5, 44.6, 71.5, 131.6, and 212.5 m above ground level, and it is equipped with a Picarro cavity ring-down spectrometer (CRDS) analyzer (G-2401), which continuously measures CO, CO2, CH4, and H2O. Sensors for detection of wind speed and direction, air temperature, barometric pressure, and humidity have also been installed at each height level. We have observed a non-negligible temperature effect in the calibration measurements, which was found to be dependent on the type of cylinder (steel or aluminum) as well as trace gas species (strongest for CO). From a target gas of known mixing ratio that has been measured once a day, we have calculated a long-term reproducibility of 2.79 ppb, 0.05 ppm, and 0.29 ppb for CO, CO2, and CH4, respectively, over 19 months of measurements. The values obtained for CO2 and CH4 are compliant with the WMO recommendations, while the value calculated for CO is higher than the recommendation. Since the installation of an air-conditioning system recently at the measurement cabin, we have acquired better temperature stability of the measurement system, but no significant improvement was observed in the measurement precision inferred from the target gas measurements. Therefore, it seems that the observed higher variation in CO measurements is associated with the instrumental noise, compatible with the precision provided by the manufacturer. |
| Databáze: | OpenAIRE |
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