Daytime CO2 urban surface fluxes from airborne measurements, eddy-covariance observations and emissions inventory in Greater London

A Font, C.S.B. Grimmond, S. Kotthaus, J.-A. Morgui, C. Stockdate, E. O'Connor, M Priestman, B Barratt

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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.
Original languageEnglish
Pages (from-to)98-106
Number of pages9
JournalENVIRONMENTAL POLLUTION
Volume196
Early online date13 Oct 2014
DOIs
Publication statusPublished - Jan 2015

Keywords

  • carbon dioxide
  • urban fluxes
  • aircraft surveys
  • eddy covariance
  • megacity
  • emissions inventory

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