the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Temporal variation of VOC fluxes measured with PTR-TOF above a boreal forest
Simon Schallhart
Pekka Rantala
Maija K. Kajos
Juho Aalto
Ivan Mammarella
Taina M. Ruuskanen
Markku Kulmala
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Boreal rivers are significant sources of carbon dioxide (CO2) and methane (CH4) to the atmosphere but the controls of these emissions are uncertain. We measured four months of CO2 and CH4 exchange between a regulated boreal river and the atmosphere with eddy covariance. We found statistical relationships between the gas exchange and several environmental variables, the most important of which were dissolved CO2 partial pressure in water, wind speed, and water temperature.
We present a novel version of an aerosol number size distribution instrument, showcasing its capability to measure particle number concentration and particle number size distribution between 1 and 12 nm. Our results show that the instrument agrees well with existing instrumentation and allows for both the accurate measurement of the smallest particles and overlap with more conventional aerosol number size distribution instruments.