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Active Atmosphere-Ecosystem Exchange of the Vast Majority of Detected Volatile Organic Compounds
Ist Teil von
Science (American Association for the Advancement of Science), 2013-08, Vol.341 (6146), p.643-647
Ort / Verlag
Washington, DC: American Association for the Advancement of Science
Erscheinungsjahr
2013
Quelle
Science Online_科学在线
Beschreibungen/Notizen
Numerous volatile organic compounds (VOCs) exist in Earth's atmosphere, most of which originate from biogenic emissions. Despite VOCs' critical role in tropospheric chemistry, studies for evaluating their atmosphere-ecosystem exchange (emission and deposition) have been limited to a few dominant compounds owing to a lack of appropriate measurement techniques. Using a high—mass resolution proton transfer reaction—time of flight—mass spectrometer and an absolute value eddy-covariance method, we directly measured 186 organic ions with net deposition, and 494 that have bidirectional flux. This observation of active atmosphere-ecosystem exchange of the vast majority of detected VOCs poses a challenge to current emission, air quality, and global climate models, which do not account for this extremely large range of compounds. This observation also provides new insight for understanding the atmospheric VOC budget.