Journal
ATMOSPHERIC CHEMISTRY AND PHYSICS
Volume 16, Issue 17, Pages 10965-10984Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-16-10965-2016
Keywords
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Funding
- Max Planck Society
- Instituto Nacional de Pesquisas da Amazonia
- ATTO project (German Federal Ministry of Education and Research)
- BMBF [01LB1001A]
- Brazilian Ministerio da Ciencia, Tecnologia e Inovacao FINEP/MCTI [01.11.01248.00]
- UEA
- FAPEAM
- LBA/INPA
- SDS/CEUC/RDS-Uatuma
- Natural Environment Research Council for funding the CLAIRE-UK project [NE/I012567/1]
- Natural Environment Research Council [NE/I012567/1]
- EU Regional Development Foundation: Environmental Conservation and Environmental Technology R&D Programme project BioAtmos [3.2.0802.11-0043, 10.1-6/13/1028]
- Estonian Research Infrastructures Roadmap project Estonian Environmental Observatory [3.2.0304.11-0395]
- Archimedes Foundation (international programme DoRa)
- Freunde und Forderer der Goethe Universitat
- European Commission [287382]
- ANR-CANOPEE
- ChArMEx
- CEA
- CNRS
- FAPESP [2013/25058-1, 2013/05014-0]
- Natural Environment Research Council [ceh020001, NE/I012036/1, 1096362, NE/I012567/1] Funding Source: researchfish
- NERC [ceh020001, NE/I012036/1, NE/I012567/1] Funding Source: UKRI
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Methyl ethyl ketone (MEK) enters the atmosphere following direct emission from vegetation and anthropogenic activities, as well as being produced by the gas-phase oxidation of volatile organic compounds (VOCs) such as n-butane. This study presents the first overview of ambient MEK measurements at six different locations, characteristic of forested, urban and marine environments. In order to understand better the occurrence and behaviour of MEK in the atmosphere, we analyse diel cycles of MEK mixing ratios, vertical profiles, ecosystem flux data, and HYSPLIT back trajectories, and compare with co-measured VOCs. MEK measurements were primarily conducted with protontransfer-reaction mass spectrometer (PTR-MS) instruments. Results from the sites under biogenic influence demonstrate that vegetation is an important source of MEK. The diel cycle of MEK follows that of ambient temperature and the forest structure plays an important role in air mixing. At such sites, a high correlation of MEK with acetone was observed (e.g. r(2) = 0 : 96 for the SMEAR Estonia site in a remote hemiboreal forest in Tartumaa, Estonia, and r(2) = 0 : 89 at the ATTO pristine tropical rainforest site in central Amazonia). Under polluted conditions, we observed strongly enhanced MEK mixing ratios. Overall, the MEK mixing ratios and flux data presented here indicate that both biogenic and anthropogenic sources contribute to its occurrence in the global atmosphere.
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