SRCosmos:

Order of appearence	Full citation	SRCosmos Link
1	Ammann C, Spirig C, Neftel A, Steinbacher M, Komenda M, Schaub A, 2004. Application of PTR-MS for measurements of biogenic VOC in a deciduous forest. Int. J. Mass. Spec. 239: 87–101.
2	De-Gouw JA, Howard CJ, Custer TG, Fall R, 1999. Emissions of volatile organic compounds from cut grass and clover are enhanced during the drying process. Geophys. Res. Lett. 26: 811–814.
3	Fehsenfeld F, Calvert J, Fall R, Goldan P, Guenther AB, Hewitt CN, Lamb B, Liu S, Trainer M, Westberg H, Zimmermann P, 1992. Emissions of volatile organic compounds from vegetation and the implications for atmospheric chemistry. Global Biogeochem. Cycles 6: 389–430.
4	Gaman A, Rannik U, Aalto P, Pohja T, Siivola E, Kulmala M, Vesala T, 2004. Relaxed eddy accumulation system for size-resolved aerosol particle flux measurements. J. Atmos. Oceanic Technol. 21: 933–943.
5	Guenther A, Hewitt CN, Erickson D, Fall R, Geron C, Graedel T, Harley P, Klinger L, Lerdau M, Mc-Kay WA, Pierce T, Scholes B, Steinbrecher R, Tallamraju R, Taylor J, Zimmerman P, 1995. A global model of natural volatile organic compound emissions. J. Geophys. Res. 100: 8873–8892.
6	Hakola H, Rinne J, Laurila T, 1998. Hydrocarbon emission rates of tea-leafed willow (Salix phylicifolia), Silver birch (Betula pendula) and European aspen (Populus tremula). Atmos. Environ. 32: 1825–1833.
7	Hakola H, Laurila T, Rinne J, Puhto K, 2000. The ambient concentrations of biogenic hydrocarbons at a North-European site. Atmos. Environ. 34: 4971–4982.
8	Hakola H, Laurila T, Lindfors V, Hellen H, Gaman A, Rinne J, 2001. Variation of the VOC emission rates of birch species during the growing season. Boreal Env. Res. 6: 237–249.	SRCosmos
9	Hakola H, Tarvainen V, Laurila T, Hiltunen V, Hellen H, Keronen P, 2003. Seasonal variation of VOC concentrations above a boreal coniferous forest. Atmos. Environ. 37: 1623–1634.
10	Hari P, Keronen P, Back J, Altimir N, Linkosalo T, Pohja T, Kulmala M, Vesala T, 1999. An improvement of the method for calibrating measurements of photosynthetic CO2 flux. Plant, Cell & Environment 22: 1297–1301.
11	Heikes BG, Chang W, Pilson MEQ, Swift E, Singh HB, Guenther A, Jacob DJ, Field BD, Fall R, Riemer D, Brand L, 2002. Atmospheric methanol budget and ocean implication. Global Biogeochem. Cycles 16, doi:10.1029/2002GB001895.
12	Hellen H, Hakola H, Reissell A, Ruuskanen TM, 2004. Carbonyl compounds in coniferous forest air in Hyytiala, Southern Finland. Atmos. Chem. Phys. 4: 1771–1780.
13	Isidorov VA, Zenkevich IG, Ioffe BV, 1985. Volatile organic compounds in the atmosphere of forest. Atmos. Environ. 19: 1–8.
14	Jacob DJ, Field BD, Jin EM, Bey I, Li Q, Logan JA, Yantosca RM, Singh HB, 2002. Atmospheric budget of acetone. J. Geophys. Res. 107(D10), doi:10.1029/ 2001JD000694.
15	Janson R, 1993. Monoterpene emissions from Scots pine and Norwegian spruce. J. Geophys. Res. 98: 2839–2850.
16	Janson R, & de Serves C. 2001. Acetone and monoterpene emissions from boreal forest in northern Europe. Atmos. Environ. 35: 4629–4637.
17	Janson RW, De Serves C. & Romero R. 1999. Emission of isoprene and carbonyl compounds from a boreal forest and wetland in Sweden. Agric. For. Meteorol. 98–99: 671–681.
18	Karl T, Guenther A, Jordan A, Fall R, Lindinger W, 2001. Eddy covariance measurement of biogenic oxygenated VOC emissions from hay harvesting. Atmos. Environ. 35: 491–495.
19	Karl TG, Spirig C, Rinne J, Stroud C, Prevost P, Greenberg J, Fall R, Guenther A, 2002. Virtual disjunct eddy covariance measurements of organic trace compound fluxes from a subalpine forest using proton transfer reaction mass spectrometry. Atmos. Chem. Phys. 2: 279–291.
20	Laurila T, Hakola H, 1996. Seasonal cycle of C2–C5 hydrocarbons over the Baltic Sea and Northern Finland. Atmos. Environ. 30: 1597–1607.
21	Laurila T, Hakola H, Lindfors V, 1999. Biogenic VOCs in continental Northern Europe — Concentrations and photochemistry. Phys. Chem. Earth 24: 689–693.
22	Lindfors V, Laurila T, Hakola H, Steinbrecher R, Rinne J, 2000. Modeling biogenic terpene emissions in the European boreal region. Atmos. Environ. 34: 4983–4996.
23	Lindinger W, Hansel A, Jordan A, 1998a. Proton-transferreaction mass spectrometry (PTR-MS): on-line monitoring of volatile organic compounds at pptv levels. Chem. Soc. Rev. 27: 347–354.
24	Lindinger W, Hansel A, Jordan A, 1998b. Review: On-line monitoring of volatile organic compounds at pptv levels by means of Proton-Transfer-Reaction Mass Spectrometry (PTR-MS), Medical applications, food control and environmental research. Int. J. Mass Spec. Ion Proc. 173: 191–241.
25	Mac-Donald RC, Fall R, 1993. Detection of substantial emissions of methanol from plants to the atmosphere. Atmos. Environ. 27A: 1709–1713.
26	Muller JF, 1992. Geographical distribution and seasonal variation of surface emissions and deposition velocities of atmospheric trace gases. J. Geophys. Res. 97: 3787–3804.
27	Nemecek-Marshall M, Mac-Donald RC, Franzen JJ, Wojciechowski CL, Fall R, 1995. Methanol emission from leaves. Plant Physiol. 108: 1359–1368.
28	Rinne HJI, Guenther AB, Warneke C, de Gouw J.A. & Luxembourg S.L. 2001. Disjunct eddy covariance technique for trace gas flux measurements. Geophys. Res. Lett. 28: 3139–3142.
29	Rinne J, Hakola H, Laurila T, 1999. Vertical fluxes of monoterpenes above a Scots pine stand in the boreal vegetation zone. Phys. Chem. Earth. 24: 711–715.
30	Rinne J, Hakola H, Laurila T, Rannik U, 2000a. Canopy scale monoterpene emissions of Pinus sylvestris dominated forests. Atmos. Environ. 34: 1099–1107.
31	Rinne J, Tuovinen JP, Laurila T, Hakola H, Aurela M, Hypen H, 2000b. Measurements of isoprene and monoterpene fluxes by a gradient method above a northern boreal forest. Agric. For. Meteorol. 102: 25–37.
32	Sellegri K, Umann B, Hanke M, Arnold F, 2005. Deployment of a ground-based CIMS apparatus for the detection of organic gases in the boreal forest during the QUEST campaign. Atmos. Chem. Phys. 5: 357–372.
33	Simpson D, Winiwarter W, Borjesson G, Cinderby S, Ferreiro A, Guenther A, Hewitt N, Janson R, Khalil MAK, Owen S, Pierce T, Puxbaum H, Shearer M, Skiba U, Steinbrecher R, Tarrason L, Oquist MG, 1999. Inventorying emissions from nature in Europe. J. Geophys. Res. 104: 8113–8152.
34	Spanke J, Rannik U, Forkel R, Nigge W, Hoffmann T, 2001. Emission fluxes and atmospheric degradation of monoterpenes above a boreal forest: field measurements and modeling. Tellus 53B: 406–422.
35	Suni T, Rinne J, Reissell A, Altimir N, Keronen P, Rannik U, Dal Maso M., Kulmala M. & Vesala T. 2003. Longterm measurements of surface fluxes above a Scots pine forest in Hyytiala, southern Finland, 1996–2001. Boreal Env. Res. 8: 287–301.
36	Tani A, Hayward S, Hewitt CN, 2003. Measurement of monoterpenes and related compounds by proton transfer reaction — mass spectrometry (PTR-MS). Int. J. Mass Spec. 223–224: 561–578.
37	Tani A, Hayward S, Hansel A, Hewitt CN, 2004. Effect of water vapour pressure on monoterpene measurements using proton transfer reaction — mass spectrometry (PTR-MS). Int. J. Mass Spec. 239: 161–169.
38	Warneke C, Luxembourg SL, de Gouw J.A., Rinne H.J.I., Guenther A.B. & Fall R. 2002. Disjunct eddy covariance measurements of oxygenated volatile organic compound fluxes from an alfalfa field before and after cutting. J. Geophys. Res. 107(D8), doi:10.1029/2001JD000594.
39	Vesala T, Haataja J, Aalto P, Altimir N, Buzorius G, Keronen P, Lahti T, Markkanen T, Makela JM, Nikinmaa E, Palmroth S, Palva L, Pohja T, Pumpanen J, Rannik U, Siivola E, Ylitalo H, Hari P, Kulmala M, 1998. Long-term field measurements of atmosphere–surface interactions in boreal forest combining forest ecology, micrometeorology, aerosol physics and atmospheric chemistry. Trends in Heat, Mass and Momentum Transfer. 4: 17–35.
40	Vesala T, Suni T, Rannik U, Keronen P, Markkanen T, Sevanto S, Gronholm T, Smolander S, Kulmala M, Ilvesniemi H, Ojansuu R, Uotila A, Levula J, Makela A, Pumpanen J, Kolari P, Kulmala L, Altimir N, Berninger F, Nikinmaa E, Hari P, 2005. Effect of thinning on surface fluxes in a boreal forest. Global Biogeochem. Cycles 19, GB2001, doi:10.1029/2004GB002316.

Keywords
Abstract	On-line measurements of atmospheric VOC concentrations in the European boreal zone with a proton transfer reaction mass spectrometer were conducted at SMEAR II station in Hyytiala, south-western Finland on 2–22 July 2004. The measurements showed a strong diurnal variation of several compounds. A factor analysis performed for the concentration data was used to classify the measured VOC masses into three classes based on the behavior of their concentrations. The masses in the first class had a high diurnal variation with maximum values in the afternoon. Compounds contributing to masses in this category were e.g. methanol, acetone, methyl-vinyl-ketone and hexanal. The concentrations of masses in the second class had also a high diurnal variation, but with maxima during the night when the mixing of the atmospheric surface layer was weak. Monoterpenes and phenol are compounds contributing to the masses in this category. The masses in the third class did not have a marked diurnal cycle and were not dependent on the local meteorological parameters. The masses having a strong positive loading on this factor were those associated with anthropogenic compounds with relatively long atmospheric life-times, such as benzene. Considering the difference in the measurement height, the total monoterpene concentration measured by the PTR-MS was consistent with the concentration measured by gas chromatography-mass spectrometer with adsorbent sampling.
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Name	Affiliation	Home page	e-mail	Total pubs
Hakola H	Finnish Meteorological Institute, Air Quality Research, Sahaajankatu 20 E, FIN-00880 Helsinki, Finland			9
Kulmala M	Department of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland			70
Reissell A	Department of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland			6
Rinne J	Department of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland			9
Ruuskanen TM	University of Helsinki, Department of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland			4
Taipale R	Department of Physical Sciences, P.O. Box 64, FI-00014 University of Helsinki, Finland			3