Volatile organic compounds (VOCs) in photochemically aged air from the Eastern and Western Mediterranean

Hdl Handle:
http://hdl.handle.net/10034/620198
Title:
Volatile organic compounds (VOCs) in photochemically aged air from the Eastern and Western Mediterranean
Authors:
Derstroff, Bettina; Hueser, Imke; Sander, Rolf; Bourtsoukidis, Efstratios; Crowley, John N.; Fischer, Horst; Gromov, Sergey; Harder, Hartwig; Kesselmeier, Juergen; Lelieveld, Jos; Mallik, Chinmay; Martinez, Monica; Novelli, Anna; Parchatka, Uwe; Phillips, Gavin J. ( 0000-0003-4443-0822 ) ; Sauvage, Carina; Schuladen, Jan; Stoenner, Christof; Tomsche, Laura; Williams, Jonathan
Abstract:
During the summertime CYPHEX campaign (CYprus PHotochemical EXperiment 2014) in the Eastern Mediterranean, multiple volatile organic compounds (VOCs) were measured from a 650 m hilltop site in western Cyprus (34°57' N/32°23' E). Periodic shifts in the northerly Etesian winds resulted in the site being alternately impacted by photochemically processed emissions from Western (Spain, France, Italy) and Eastern (Turkey, Greece) Europe. In this study we examine the temporal variation of VOCs at the site. The sparse Mediterranean scrub vegetation generated diel cycles in the reactive biogenic hydrocarbon isoprene, from below detection limit at night to 100 pptv by day on average. In contrast, the oxygenated volatile organic compounds (OVOCs) methanol and acetone exhibited no diel cycle and were approximately an order of magnitude higher in mixing ratio (range: 1–8 ppbv) than the locally emitted isoprene (up to 320 pptv), total monoterpenes (up to 250 pptv) and aromatic compounds such as benzene and toluene (up to 100 pptv, spikes up to 400 pptv). Acetic acid was present at mixing ratios between 0.05 and 4 ppbv and followed a pronounced diel cycle in one specific period, which was related to local production and loss and local meteorological effects. During the rest of the campaign the impact of the free troposphere and long distance transport from source regions dominated over local processes and diel cycles were not observed. The Lagrangian model FLEXPART was used to determine transport patterns and photochemical processing times of air masses originating from Eastern and Western Europe. Eastern and Western European air masses showed distinct trace gas concentrations, with ca. 20 % higher ozone and ca. 30–50 % higher values for most of the OVOCs observed from the East. Using the FLEXPART calculated transport time, the contribution of photochemical processing, sea surface contact and dilution was estimated. Methanol, acetone and acetic acid all decreased with residence time in the marine boundary layer (MBL) with loss rates of 0.1 ± 0.01 ppbv/h, 0.06 ± 0.01 ppbv/h, 0.05 ± 0.01 ppbv/h from Eastern Europe and 0.06 ± 0.01 ppbv/h, 0.02 ± 0.004 ppbv/h and 0.03 ± 0.004 ppbv/h from Western Europe, respectively. The most soluble species, acetic acid, showed the lowest loss rates, indicating that solubility limited deposition to the ocean was not the only factor and that turbulent transport, plume dilution, microbial consumption within the surface of the ocean and especially entrainment from the free troposphere may also be important. Correlations between acetone, methanol and acetic acid were rather weak in western air masses (r2 = 0.52–0.62), but were stronger in air masses measured after the shorter transport time from the East (r2 = 0.53–0.81).
Affiliation:
Max Planck Institute for Chemistry; University of Chester; Forschungzentrum Juelich
Citation:
Derstroff, B., et. al. (2017). Volatile organic compounds (VOCs) in photochemically aged air from the Eastern and Western Mediterranean, Atmospheric Chemistry and Physics, 17(15), 9547-9566. DOI: 10.5194/acp-2016-746
Publisher:
Copernicus Publications
Journal:
Atmospheric Chemistry and Physics Discussions
Publication Date:
9-Aug-2017
URI:
http://hdl.handle.net/10034/620198
DOI:
10.5194/acp-17-9547-2017
Additional Links:
http://www.atmos-chem-phys-discuss.net/acp-2016-746/
Type:
Article
Language:
en
Description:
Discussion started 06/09/16
EISSN:
1680-7375
Appears in Collections:
Natural Sciences

Full metadata record

DC FieldValue Language
dc.contributor.authorDerstroff, Bettinaen
dc.contributor.authorHueser, Imkeen
dc.contributor.authorSander, Rolfen
dc.contributor.authorBourtsoukidis, Efstratiosen
dc.contributor.authorCrowley, John N.en
dc.contributor.authorFischer, Horsten
dc.contributor.authorGromov, Sergeyen
dc.contributor.authorHarder, Hartwigen
dc.contributor.authorKesselmeier, Juergenen
dc.contributor.authorLelieveld, Josen
dc.contributor.authorMallik, Chinmayen
dc.contributor.authorMartinez, Monicaen
dc.contributor.authorNovelli, Annaen
dc.contributor.authorParchatka, Uween
dc.contributor.authorPhillips, Gavin J.en
dc.contributor.authorSauvage, Carinaen
dc.contributor.authorSchuladen, Janen
dc.contributor.authorStoenner, Christofen
dc.contributor.authorTomsche, Lauraen
dc.contributor.authorWilliams, Jonathanen
dc.date.accessioned2016-10-18T08:57:30Z-
dc.date.available2016-10-18T08:57:30Z-
dc.date.issued2017-08-09-
dc.identifier.citationDerstroff, B., et. al. (2017). Volatile organic compounds (VOCs) in photochemically aged air from the Eastern and Western Mediterranean, Atmospheric Chemistry and Physics, 17(15), 9547-9566. DOI: 10.5194/acp-2016-746en
dc.identifier.doi10.5194/acp-17-9547-2017-
dc.identifier.urihttp://hdl.handle.net/10034/620198-
dc.descriptionDiscussion started 06/09/16-
dc.description.abstractDuring the summertime CYPHEX campaign (CYprus PHotochemical EXperiment 2014) in the Eastern Mediterranean, multiple volatile organic compounds (VOCs) were measured from a 650 m hilltop site in western Cyprus (34°57' N/32°23' E). Periodic shifts in the northerly Etesian winds resulted in the site being alternately impacted by photochemically processed emissions from Western (Spain, France, Italy) and Eastern (Turkey, Greece) Europe. In this study we examine the temporal variation of VOCs at the site. The sparse Mediterranean scrub vegetation generated diel cycles in the reactive biogenic hydrocarbon isoprene, from below detection limit at night to 100 pptv by day on average. In contrast, the oxygenated volatile organic compounds (OVOCs) methanol and acetone exhibited no diel cycle and were approximately an order of magnitude higher in mixing ratio (range: 1–8 ppbv) than the locally emitted isoprene (up to 320 pptv), total monoterpenes (up to 250 pptv) and aromatic compounds such as benzene and toluene (up to 100 pptv, spikes up to 400 pptv). Acetic acid was present at mixing ratios between 0.05 and 4 ppbv and followed a pronounced diel cycle in one specific period, which was related to local production and loss and local meteorological effects. During the rest of the campaign the impact of the free troposphere and long distance transport from source regions dominated over local processes and diel cycles were not observed. The Lagrangian model FLEXPART was used to determine transport patterns and photochemical processing times of air masses originating from Eastern and Western Europe. Eastern and Western European air masses showed distinct trace gas concentrations, with ca. 20 % higher ozone and ca. 30–50 % higher values for most of the OVOCs observed from the East. Using the FLEXPART calculated transport time, the contribution of photochemical processing, sea surface contact and dilution was estimated. Methanol, acetone and acetic acid all decreased with residence time in the marine boundary layer (MBL) with loss rates of 0.1 ± 0.01 ppbv/h, 0.06 ± 0.01 ppbv/h, 0.05 ± 0.01 ppbv/h from Eastern Europe and 0.06 ± 0.01 ppbv/h, 0.02 ± 0.004 ppbv/h and 0.03 ± 0.004 ppbv/h from Western Europe, respectively. The most soluble species, acetic acid, showed the lowest loss rates, indicating that solubility limited deposition to the ocean was not the only factor and that turbulent transport, plume dilution, microbial consumption within the surface of the ocean and especially entrainment from the free troposphere may also be important. Correlations between acetone, methanol and acetic acid were rather weak in western air masses (r2 = 0.52–0.62), but were stronger in air masses measured after the shorter transport time from the East (r2 = 0.53–0.81).en
dc.language.isoenen
dc.publisherCopernicus Publicationsen
dc.relation.urlhttp://www.atmos-chem-phys-discuss.net/acp-2016-746/en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectAtmospheric chemistryen
dc.subjectVolatile organic compoundsen
dc.subjectEnvironmental chemistryen
dc.subjectPtrmsen
dc.titleVolatile organic compounds (VOCs) in photochemically aged air from the Eastern and Western Mediterraneanen
dc.typeArticleen
dc.identifier.eissn1680-7375-
dc.contributor.departmentMax Planck Institute for Chemistry; University of Chester; Forschungzentrum Juelichen
dc.identifier.journalAtmospheric Chemistry and Physics Discussionsen
dc.date.accepted2016-08-31-
or.grant.openaccessYesen
rioxxterms.funderUnfundeden
rioxxterms.identifier.projectUnfundeden
rioxxterms.versionVoRen
rioxxterms.licenseref.startdate2216-10-18-
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