title: Daytime CO2 urban surface fluxes from airborne measurements,  eddy-covariance observations and emissions inventory in Greater  London.
abstract: Airborne measurements within the urban mixing layer (360 m) over Greater London are used to quantify CO(2) emissions at the meso-scale. Daytime CO(2) fluxes, calculated by the Integrative Mass Boundary Layer (IMBL) method, ranged from 46 to 104 μmol CO(2) 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.
authors.forename: A
authors.initials: A
authors.lastname: Font
authors.forename: C S B
authors.initials: CS
authors.lastname: Grimmond
authors.forename: S
authors.initials: S
authors.lastname: Kotthaus
authors.forename: J-A
authors.initials: JA
authors.lastname: Morguí
authors.forename: C
authors.initials: C
authors.lastname: Stockdale
authors.forename: E
authors.initials: E
authors.lastname: O'Connor
authors.forename: M
authors.initials: M
authors.lastname: Priestman
authors.forename: B
authors.initials: B
authors.lastname: Barratt
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D002245:Carbon Dioxide / Q000032:analysis*; D004784:Environmental Monitoring; D008131:London
chemical_list: D000393:Air Pollutants; D002245:Carbon Dioxide