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Göteborgs universitets publikationer

High-Molecular Weight Dimer Esters Are Major Products in Aerosols from α-Pinene Ozonolysis and the Boreal Forest

Författare och institution:
Kasper Kristensen (-); Ågot Watne (Institutionen för kemi och molekylärbiologi); Julia Hammes (Institutionen för kemi och molekylärbiologi); Anna Lutz (Institutionen för kemi och molekylärbiologi); Mattias Hallquist (Institutionen för kemi och molekylärbiologi); Merete Bilde (-); Marianne Glasius (-)
Publicerad i:
Environmental Science and Technology, 3 ( 8 ) s. 280–285
ISSN:
0013-936X
E-ISSN:
1520-5851
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2016
Språk:
engelska
Fulltextlänk:
Sammanfattning (abstract):
This study investigates the contribution of high-molecular weight dimer esters to laboratory-generated α-pinene gas- and particle-phase secondary organic aerosol (SOA) and particulate matter (PM) collected at the Nordic boreal forest site of Hyytiälä, Finland. Laboratory flow reactor experiments (25 °C) show that dimer esters from ozonolysis of α-pinene contribute between 5 and 16% of the freshly formed α-pinene particle-phase SOA mass. An increased level of formation is observed at a higher relative humidity of ∼40%, and the presence of a hydroxyl radical (OH) scavenger is shown to affect the formation of dimer esters. Of the 28 dimer esters identified in laboratory α-pinene SOA, 15 are also observed in ambient PM samples, contributing between 0.5 and 1.6% of the total PM1. The observed esters show good correlation with known α-pinene SOA tracers in collected PM samples. This work reveals an, until now, unrecognized contribution of dimer esters from α-pinene oxidation to boreal forest PM.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Kemi
NATURVETENSKAP ->
Geovetenskap och miljövetenskap ->
Miljövetenskap ->
Miljökemi
Postens nummer:
239401
Posten skapad:
2016-07-18 12:08
Posten ändrad:
2016-08-18 13:34

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