Eddy covariance measurements of the net turbulent methane flux in the city centre – results of 2-year campaign in Łódź, Poland
Item
Title (Dublin Core)
Eddy covariance measurements of the net turbulent methane flux in the city
centre – results of 2-year campaign in Łódź, Poland
centre – results of 2-year campaign in Łódź, Poland
Description (Dublin Core)
To investigate temporal variability of methane (CH<sub>4</sub>) fluxes in an urban environment, air–surface exchange fluxes of CH<sub>4</sub> were continuously measured using eddy covariance techniques at a city-centre site in Łódź, Poland, from July 2013 to August 2015. In the immediate vicinity of the measurement site, potential methane sources include vehicle traffic, dense sewerage infrastructure and natural gas networks. Sensible and latent heat fluxes have also been measured since 2000 and carbon dioxide fluxes since 2007 at this site. Upward CH<sub>4</sub> fluxes dominated during the measurement period, indicating that the city centre is a net source of CH<sub>4</sub> to the troposphere. The highest monthly fluxes were observed in winter (2.0 to 2.7 g m<sup>−2</sup> month<sup>−1</sup>) and the lowest in summer (0.8 to 1.0 g m<sup>−2</sup> month<sup>−1</sup>). Fluxes on working days were around 6 % higher than on weekends. The cumulative flux indicates that the city centre emitted a net quantity of nearly 18 g m<sup>−2</sup> of CH<sub>4</sub> in 2014. Stable values of the FCO<sub>2</sub>∕ FCH<sub>4</sub> ratio in months (minimum 2.41 × 10<sup>−3</sup>, maximum 5.3 × 10<sup>−3</sup>) and the lack of a clear annual course suggest comparable magnitude of both fluxes.
Creator (Dublin Core)
Pawlak, Włodzimierz
Fortuniak, Krzysztof
Date (Dublin Core)
2018-09-19
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-16-8281-2016
https://acp.copernicus.org/articles/16/8281/2016/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
