Quantifying biogenic carbon dioxide fluxes in an urban area

Stagakis Stavros, Feigenwinter Christian, Vogt Roland, Mutti Miriam, Zurbriggen Etienne, Pitacco Andrea
2020 Zenodo  
Urban areas constitute complex and highly heterogeneous mosaics of CO₂ sources and sinks. Anthropogenic emissions - mainly from fuel combustion due to vehicle traffic, building heating, energy production and other industrial activities - are producing high amounts of CO₂, dominating the urban CO₂ flux. The biogenic fluxes (i.e. photosynthesis, autotrophic-heterotrophic respiration) are usually smaller than the anthropogenic fluxes in urban areas, however they potentially affect the seasonal and
more » ... ct the seasonal and spatial variability of urban emissions according to green area cover fraction and seasonal climate variability. Quantifying the urban biogenic fluxes would help in discriminating human emissions from natural fluxes, recognizing the seasonal and interannual CO₂ emission variability and trends, enhance our current understanding on urban metabolism and function, and eventually improve the current urban emission inventories. Urban biogenic flux dynamics are expected to differ significantly from the rural ecosystems due to the extreme variability of urban climate in micro and local scales, urban-related stressors and diverse management practices. The Urban Heat Island (UHI) phenomenon is one of the factors that would potentially alter the urban biogenic CO₂ balance, since it affects both soil and air temperature which are important environmental drivers of the biogenic CO₂ flux processes. A relevant scientific question is if urban green tends to behave as carbon sink or source in the long term, which is still a matter of controversy in today's literature. In the framework of diFUME project (https://mcr.unibas.ch/difume/), the spatial and temporal variability of CO₂ flux by the anthropogenic and biogenic sources and sinks in Basel city centre is modelled and monitored. The approach involves the development of mechanistic models of photosynthetic uptake, plant respiration and soil respiration, dedicated to urban environment, according to meteorological observations, spatial representation of urban structure and EO monitoring of v [...]
doi:10.5281/zenodo.4506402 fatcat:gswomwmxszgg7iafq4rso4nmqu