Nature research paper: Chiral monoterpenes reveal forest emission mechanisms and drought responses
is the corrected data, and incoming VOCs VMRs were assumed negligible. Post campaign, ozone in the B2-TRF was quantified using an ozone analyser .From 9 September to 23 December 2019, the ambient air from a height of 13 high within the Biosphere 2 rainforest was continuously drawn at a flow of approximately 800 ml minthrough a main Teflon inlet line, which consisted of 37 m of 0.625 cm Teflon tubing.
The identification of the target compounds was achieved by first operating the mass spectrometer in scan mode to obtain full mass spectra to be able to compare with the NIST 70-eV electron ionization library. For further confirmation, a gas standard mixture containing the target compounds was injected into the GC-MS system.
The mass spectrometer was tuned on a weekly basis and the linearity was checked throughout the campaign. The gas standard mixture was injected into the system after each tuning and after ten samples were analysed. Routine calibrations were performed by initially flushing the TD system with the gas standard mixture at a flow of 20 ml minfor 2 min to remove the dead volume. The calibration gas was then injected with a flow of 20 ml minfor 5 min directly onto the cold injection trap within the TD.
Werner et al. described the overall ecosystem response to drought and presented data from a proton-transfer-reaction time-of-flight mass spectrometer to represent isoprene for consistency with the accompanying soil and cuvette flux data
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