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| Titel |
Flux estimates of isoprene, methanol and acetone from airborne PTR-MS measurements over the tropical rainforest during the GABRIEL 2005 campaign |
| VerfasserIn |
G. Eerdekens, L. Ganzeveld, J. Vilà-Guerau de Arellano, T. Klüpfel, V. Sinha, N. Yassaa, J. Williams, H. Harder, D. Kubistin, M. Martinez, J. Lelieveld  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 13 ; Nr. 9, no. 13 (2009-07-01), S.4207-4227 |
| Datensatznummer |
250007479
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| Publikation (Nr.) |
 copernicus.org/acp-9-4207-2009.pdf |
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| Zusammenfassung |
| Tropical forests are a strong source of biogenic volatile organic compounds
(BVOCs) to the atmosphere which can potentially impact the atmospheric
oxidation capacity. Here we present airborne and ground-based BVOC
measurements representative for the long dry season covering a large area of
the northern Amazonian rainforest (6–3° N, 50–59° W). The measurements
were conducted during the October 2005 GABRIEL (Guyanas Atmosphere-Biosphere
exchange and Radicals Intensive Experiment with the Learjet) campaign. The
vertical (35 m to 10 km) and diurnal (09:00–16:00) profiles of isoprene, its
oxidation products methacrolein and methyl vinyl ketone and methanol and
acetone, measured by PTR-MS (Proton Transfer Reaction Mass Spectrometry),
have been used to empirically estimate their emission fluxes from the forest
canopy on a regional scale. The mixed layer isoprene emission flux, inferred
from the airborne measurements above 300 m, is 5.7 mg isoprene m−2 h−1
after compensating for chemistry and ~6.9 mg isoprene m−2 h−1 taking detrainment into account. This surface flux is in
general agreement with previous tropical forest studies. Inferred methanol
and acetone emission fluxes are 0.5 mg methanol m−2 h−1 and 0.35 mg
acetone m−2 h−1, respectively. The BVOC measurements were compared
with fluxes and mixing ratios simulated with a single-column chemistry and
climate model (SCM). The inferred isoprene flux is substantially smaller
than that simulated with an implementation of a commonly applied BVOC
emission algorithm in the SCM. |
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