World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Flux Measurements of Biogenic Vocs During Echo 2003 : Volume 4, Issue 5 (14/10/2004)

By Spirig, C.

Click here to view

Book Id: WPLBN0003978187
Format Type: PDF Article :
File Size: Pages 41
Reproduction Date: 2015

Title: Flux Measurements of Biogenic Vocs During Echo 2003 : Volume 4, Issue 5 (14/10/2004)  
Author: Spirig, C.
Volume: Vol. 4, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2004
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Neftel, A., Dommen, J., Ammann, C., Thielmann, A., Grabmer, W., Wisthaler, A.,...Beauchamp, J. (2004). Flux Measurements of Biogenic Vocs During Echo 2003 : Volume 4, Issue 5 (14/10/2004). Retrieved from http://www.ebooklibrary.org/


Description
Description: Agroscope, Swiss Federal Research Station for Agroecology and Agriculture, Reckenholzstr. 191, 8046 Zürich, Switzerland. Within the framework of the AFO 2000 project ECHO, two PTR-MS instruments were operated in combination with sonic anemometers to determine biogenic VOC fluxes from a mixed deciduous forest site in North-Western Germany using the eddy covariance (EC) technique. The measurement site was characterised by a forest of inhomogeneous composition, complex canopy structure, limited extension in certain wind directions and frequent calm wind conditions during night time. As a consequence, a considerable fraction of the measurements did not qualify for flux calculations by EC and had to be discarded. The validated results show light and temperature dependent emissions of isoprene and monoterpenes from this forest, with average emissions (normalised to 30°C and 1000 µmoles m−2 s−1 PAR) of 1.5 and 0.39 µg m−2 s−1, respectively. Emissions of methanol reached on average 0.087 µg m−2 s−1 during daytime, but fluxes were too small to be detected during night time. Upward fluxes of the isoprene oxidation products methyl vinyl ketone (MVK) and methacrolein (MACR) were also found, being two orders of magnitude lower than those of isoprene. The observed fluxes are consistent with upscalings from leaf-level emission measurements of representative tree species in this forest and, in the case of MVK and MACR, can plausibly be explained by chemical production through oxidation of isoprene within the canopy. Calculations with an analytical footprint model indicate that the observed isoprene fluxes correlate with the fraction of oaks within the footprints of the flux measurement.

Summary
Flux measurements of biogenic VOCs during ECHO 2003

 

Click To View

Additional Books


  • Transport of Anthropogenic and Biomass B... (by )
  • Retrieval of Temperature Profiles from C... (by )
  • Optical Properties of Humic-like Substan... (by )
  • Tropical Tropopause Ice Clouds: a Dynami... (by )
  • Climatology of Middle Atmospheric Water ... (by )
  • A Comparison of Chemical Mechanisms Usin... (by )
  • Horizontal and Vertical Profiles of Ozon... (by )
  • Aerosol Formation Over the Boreal Forest... (by )
  • Retrieval of Global Upper Tropospheric a... (by )
  • Water-soluble Atmospheric Hulis in Urban... (by )
  • Quantitative Assessment of Atmospheric E... (by )
  • Pressure Dependent Isotopic Fractionatio... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.