Daytime CO2 urban surface fluxes from airborne measurements, eddy-covariance observations and emissions inventory in Greater London. (January 2015)

• Record Type: Journal Article
• Authors: Font, A.; Grimmond, C.S.B.; Kotthaus, S.; Morguí, J.-A.; Stockdale, C.; O'Connor, E.; Priestman, M.; Barratt, B.
• Is Part Of: Environmental pollution. Volume 196(2015)
• Page Start: 98
• Page End: 106
• Publication Date: 2015-01
• Subjects: Carbon dioxide -- Urban fluxes -- Aircraft surveys -- Eddy covariance -- Megacity -- Emissions inventory; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2014.10.001
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Airborne measurements within the urban mixing layer (360 m) over Greater London are used to quantify CO2 emissions at the meso-scale. Daytime CO2 fluxes, calculated by the Integrative Mass Boundary Layer (IMBL) method, ranged from 46 to 104 μmol CO2 m −2 s −1 for four days in October 2011. The day-to-day variability of IMBL fluxes is at the same order of magnitude as for surface eddy-covariance fluxes observed in central London. Compared to fluxes derived from emissions inventory, the IMBL method gives both lower (by −37%) and higher (by 19%) estimates. The sources of uncertainty of applying the IMBL method in urban areas are discussed and guidance for future studies is given. Highlights: CO2 was measured by aircraft in London within the urban mixing layer (360 m). Meso-scale urban emissions were estimated using aircraft observations. Airborne-fluxes within −37% and 20% of emissions from inventory. Airborne-fluxes within the range of eddy-covariance observations in central London. Abstract : CO2 airborne-derived fluxes by Boundary Layer Mass balance are an independent measure of meso-scale urban fluxes complementing urban eddy-covariance fluxes and emissions inventory.