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First eddy covariance flux measurements of semi-volatile organic compounds with the PTR3-TOF-MS
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First eddy covariance flux measurements of semi-volatile organic compounds with the PTR3-TOF-MS
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First eddy covariance flux measurements of semi-volatile organic compounds with the PTR3-TOF-MS
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Journal Article
First eddy covariance flux measurements of semi-volatile organic compounds with the PTR3-TOF-MS
2021
Overview
We present first eddy covariance flux measurements with the PTR3-TOF-MS, a novel proton transfer time of flight reaction mass spectrometer. During 3 weeks in spring 2016, the instrument recorded 10 Hz data of biogenic volatile organic compounds above a boreal forest, on top of a measurement tower at the SMEAR (Station for Measuring Ecosystem –Atmosphere Relations) II station in Hyytiälä, Finland. Flux and concentration data of isoprene, monoterpenes, and sesquiterpenes were compared to the literature. Due to the improved instrument sensitivity and a customized wall-less inlet design, we could detect fluxes of semi-volatile and low-volatility organic compounds with less than single-digit picomol per square meter per second (pmolm-2s-1) values for the first time. These compounds include sesquiterpene oxidation products and diterpenes. Daytime diterpene fluxes were in the range of 0.05 to 0.15 pmolm-2s-1, which amounts to about 0.25 % to 0.5 % of the daytime sesquiterpene flux above canopy.
