Atmos. Chem. Phys. Discuss., 11, 1189-1218, 2011
www.atmos-chem-phys-discuss.net/11/1189/2011/
doi:10.5194/acpd-11-1189-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
In situ measurements of isoprene and monoterpenes within a South-East Asian tropical rainforest
C. E. Jones1, J. R. Hopkins1,2, and A. C. Lewis1,2
1Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
2National Centre for Atmospheric Science (NCAS), Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK

Abstract. Biogenic volatile organic compounds (BVOCs) emitted from tropical rainforests comprise a substantial fraction of global atmospheric VOC emissions, however there are only relatively limited measurements of these species in tropical rainforest regions. We present observations of isoprene, α-pinene, camphene, Δ-3-carene, γ-terpinene and limonene, and oxygenated VOCs (OVOCs) of biogenic origin such as methacrolein, in ambient air above a~tropical rainforest in Malaysian Borneo. Daytime composition was dominated by isoprene, with an average mixing ratio of the order of ~1 ppb. γ-terpinene, limonene and camphene were the most abundant monoterpenes, with average daytime mixing ratios of 102, 71 and 66 ppt, respectively, and with an average monoterpene to isoprene ratio of 0.3 during sunlight hours, compared to 2.0 at night. Limonene and camphene abundances were seen to be related to both temperature and light conditions. In contrast, γ-terpinene emission occurred into the late afternoon/evening, under relatively low temperature and light conditions. We observe good agreement between surface and aircraft measurements of boundary layer isoprene and methacrolein above the natural rainforest, suggesting that the ground-level observations are broadly representative of isoprene emissions from this region.

Citation: Jones, C. E., Hopkins, J. R., and Lewis, A. C.: In situ measurements of isoprene and monoterpenes within a South-East Asian tropical rainforest, Atmos. Chem. Phys. Discuss., 11, 1189-1218, doi:10.5194/acpd-11-1189-2011, 2011.
 
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