Contribution of non methane organic volatiles exchange to the carbon budget of isoprene and monoterpene emitting plant species
Abstract
Compared to the aerosol fraction, most of the organic carbon present in the atmosphere is found in form of volatile or semivolatile compounds. Vegetation was identified being the major source of these organic volatiles, releasing carbon at the same order of magnitude as the global net biome productivity (NBP). To achieve an estimate of plants carbon exchange, including the emission and deposition of volatile organics, the exchange activity of the two isoprene and monoterpene emitting plant species Quercus robur and Fagus sylvatica was observed under field conditions during the ECHO campaign (Emission and CHemical Transformation of Biogenic Volatile Organic Compounds) in summer 2002 in Jülich, Germany. Primary productivity and VOC exchange was investigated on the branch level by means of a dynamic cuvette system. Organic volatiles were collected on adsorbent tubes and analysed later on by GC-FID and GC-MS for species composition and quantification. Short chain carbonyls were sampled on DNPH coated cartridges and analysed by HPLC-UV. For identification of a broader spectrum of volatile compounds, both methods were complemented by PTR-MS measurements for the isoprene emitting species. Isoprenoid and methanol emissions accounted for the majority of the VOC release, which was partly compensated by the deposition of other oxygenated organic compounds.
- Publication:
-
EGS - AGU - EUG Joint Assembly
- Pub Date:
- April 2003
- Bibcode:
- 2003EAEJA......269D