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Laboratory and Field Measurements of Enantiomeric Monoterpene Emissions as a Function of Chemotype, Light and Temperature : Volume 10, Issue 10 (29/10/2013)

By Song, W.

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Book Id: WPLBN0003991416
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: Laboratory and Field Measurements of Enantiomeric Monoterpene Emissions as a Function of Chemotype, Light and Temperature : Volume 10, Issue 10 (29/10/2013)  
Author: Song, W.
Volume: Vol. 10, Issue 10
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Bourgeois, I., Staudt, M., Williams, J., & Song, W. (2013). Laboratory and Field Measurements of Enantiomeric Monoterpene Emissions as a Function of Chemotype, Light and Temperature : Volume 10, Issue 10 (29/10/2013). Retrieved from http://worldlibrary.net/


Description
Description: Max-Planck-Institut für Chemie, Hahn-Meitner-Weg 1, 55128 Mainz, Germany. Plants emit significant amounts of monoterpenes into the Earth's atmosphere where they react rapidly to form a multitude of gas phase species and particles. Many monoterpenes exist in mirror images forms or enantiomers. In this study the enantiomeric monoterpene profile for several representative plants (Quercus ilex L., Rosmarinus officinalis L., and Pinus halepensis Mill.) was investigated as a function of chemotype, light and temperature both in the laboratory and in the field. Analysis of enantiomeric monoterpenes from 19 Quercus ilex individuals from Southern France and Spain revealed four regiospecific chemotypes (genetically fixed emission patterns). In agreement with previous work, only Quercus ilex emissions increased strongly with light. However, for all three plant species no consistent enantiomeric variation was observed as a function of light, and the enantiomeric ratio of α-pinene was found vary by less than 20% from 100 and 1000 Μmol m–2 s–1 PAR. The rate of monoterpene emission increased with temperature from all three plant species, but little variation in the enantiomeric distribution of Α-pinene was observed with temperature. There was more enantiomeric variability between individuals of the same species than could be induced by either light or temperature. Field measurements of α-pinene enantiomer mixing ratios in the air taken at a Quercus ilex forest in Southern France, and several other previously reported field enantiomeric ratio diel cycle profiles are compared. All show smoothly varying diel cycles (some positive and some negative) even over changing wind directions. This is surprising in comparison with variations of enantiomeric emission patterns shown by individuals of the same species.

Summary
Laboratory and field measurements of enantiomeric monoterpene emissions as a function of chemotype, light and temperature

Excerpt
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