References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-11-1189-2011

In situ measurements of isoprene and monoterpenes within a South-East Asian tropical rainforest

Jones

C. E.

¹ Hopkins

J. R.

¹ ² Lewis

A. C.

¹ ²

Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK

National Centre for Atmospheric Science (NCAS), Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK

17 01 2011

11 1 1189 1218

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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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.

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