1. Effects of urban density on carbon dioxide exchanges: Observations of dense urban, suburban and woodland areas of southern England.
- Author
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Ward, H.C., Kotthaus, S., Grimmond, C.S.B., Bjorkegren, A., Wilkinson, M., Morrison, W.T.J., Evans, J.G., Morison, J.I.L., and Iamarino, M.
- Subjects
URBAN density ,CARBON dioxide adsorption ,SUBURBS ,FORESTS & forestry ,EMISSIONS (Air pollution) ,PHOTOSYNTHESIS ,RESPIRATION in plants - Abstract
Anthropogenic and biogenic controls on the surface–atmosphere exchange of CO 2 are explored for three different environments. Similarities are seen between suburban and woodland sites during summer, when photosynthesis and respiration determine the diurnal pattern of the CO 2 flux. In winter, emissions from human activities dominate urban and suburban fluxes; building emissions increase during cold weather, while traffic is a major component of CO 2 emissions all year round. Observed CO 2 fluxes reflect diurnal traffic patterns (busy throughout the day (urban); rush-hour peaks (suburban)) and vary between working days and non-working days, except at the woodland site. Suburban vegetation offsets some anthropogenic emissions, but 24-h CO 2 fluxes are usually positive even during summer. Observations are compared to estimated emissions from simple models and inventories. Annual CO 2 exchanges are significantly different between sites, demonstrating the impacts of increasing urban density (and decreasing vegetation fraction) on the CO 2 flux to the atmosphere. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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