Towerbased and Airborne VOC Flux Measurements Over the Amazonian Rainforest During LBA-CLAIRE 2001
Abstract
Volatile organic compounds (VOC) have a major influence on the atmospheric oxidative capacity, greenhouse gas concentrations, and the formation of aerosols, which implies a crucial role of VOC in climate forcing. Even though tropical vegetation has a major impact on global VOC emission strength, these regions have been the least investigated to date, and flux estimates have high uncertainties. During the LBA-CLAIRE 2001 project (Cooperative LBA Airborne Regional Experiment 2001, as part of the Large Scale Biosphere-Atmosphere Experiment in Amazonia), canopy-scale and landscape-scale VOC fluxes were estimated for a remote tropical rainforest site north of Manaus, using different measurement techniques. Above-canopy fluxes were investigated simultaneously with surface layer gradients and relaxed eddy accumulation measurements from a 52-m tower. Airborne measurements of vertical profiles of VOC mixing ratios from 100m to 3000m were used to estimate flux rates on a regional scale. Chemical processes in the model estimates were constrained with measured values of O3, NOx and VOC. VOC flux rates will be compared with CO2 fluxes, which were determined by similar procedures.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2003
- Bibcode:
- 2003AGUFM.A21F..08K
- Keywords:
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- 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0315 Biosphere/atmosphere interactions;
- 0322 Constituent sources and sinks;
- 0400 Biogeosciences;
- 1615 Biogeochemical processes (4805)