ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-7-973-2007 Mirror image hydrocarbons from Tropical and Boreal forests Williams J. 1 Yassaa N. 1 Bartenbach S. 1 Lelieveld J. 1 Air Chemistry Department, Max-Planck Institute for Chemistry, J.J. Becher Weg 27, 55020 Mainz, Germany 22 02 2007 7 3 973 980 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. This article is available from http://www.atmos-chem-phys.net/7/973/2007/acp-7-973-2007.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/7/973/2007/acp-7-973-2007.pdf

Monoterpenes, emitted in large quantities by trees to attract pollinators and repel herbivores, can exist in mirror image forms called enantiomers. In this study such enantiomeric pairs have been measured in ambient air over extensive forest ecosystems in South America and northern Europe. For the dominant monoterpene, α-pinene, the (−)-form was measured in large excess over the (+)-form over the Tropical rainforest, whereas the reverse was observed over the Boreal forest. Interestingly, over the Tropical forest (−)-α-pinene did not correlate with its own enantiomer, but correlated well with isoprene. The results indicate a remarkable ecosystem scale enantiomeric fingerprint and a nexus between the biosphere and atmosphere.

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