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  Exchange fluxes of NO2 and O3 at soil and leaf surfaces in an Amazonian rain forest

Gut, A., Scheibe, M., Rottenberger, S., Rummel, U., Welling, M., Ammann, C., et al. (2002). Exchange fluxes of NO2 and O3 at soil and leaf surfaces in an Amazonian rain forest. Journal of Geophysical Research, 107(D20): 8060. doi:10.1029/2001JD000654.

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Genre: Journal Article
Alternative Title : J. Geophys. Res.

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 Creators:
Gut, A.1, Author              
Scheibe, M., Author
Rottenberger, S.1, Author              
Rummel, U.1, Author              
Welling, M.1, Author              
Ammann, C.1, Author              
Kirkman, G. A.1, Author              
Kuhn, U.1, Author              
Meixner, F. X.1, Author              
Kesselmeier, J.1, Author              
Lehmann, B. E., Author
Schmidt, W., Author
Müller, E., Author
Piedade, M. T. F., Author
Affiliations:
1Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              

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Free keywords: nitrogen oxides; ozone; deposition; flux techniques; rainforest; Amazonia
 Abstract: Trace gas exchange of NO2 and O-3 at the soil surface of the primary rain forest in Reserva Biologica Jaru (Rondonia, Brazil) was investigated by chamber and gradient methods. The ground resistance to NO2 and O-3 deposition to soil was quantified for dry and wet surface conditions using dynamic chambers and was found to be fairly constant at 340 +/- 110 and 190 +/- 70 s m(-1), respectively. For clear-sky conditions, the thermal stratification of the air in the first meter from the forest floor was stable during daytime and unstable during nighttime. The aerodynamic resistance to NO2 and O-3 deposition to the ground in the first meter above the forest floor was determined by measurements of Rn-220 and CO2 concentration gradients and CO2 surface fluxes. The aerodynamic resistance of the 1(-m) layer above the ground was 1700 s m(-1) during daytime and 600 s m(-1) during nighttime. The deposition flux of O-3 and NO2 was quantified for clear-sky conditions from the measured concentrations and the quantified resistances. For both trace gases, deposition to the soil was generally observed. The O-3 deposition flux to the soil was only significantly different from zero during daytime. The maximum of -1.2 nmol m(-2) s(-1) was observed at about 1800 and the mean daytime flux was -0.5 nmol m(-2) s(-1). The mean NO2 deposition flux during daytime was -1.6 ng N m(-2) s(-1) and during nighttime -2.2 ng N m(-2) s(-1). The NOx budget at the soil surface yielded net emission day and night. The NO2 deposition flux was 74% of the soil NO emission flux during nighttime and 34% during daytime. The plant uptake of NO2 and O-3 by the leaves of Laetia corymbulosa and Pouteria glomerata, two typical plant species for the Amazon rain forest, was investigated in a greenhouse in Oldenburg (Germany) using branch cuvettes. The uptake of O-3 was found to be completely under stomatal control. The uptake of NO2 was also controlled by the stomatal resistance but an additional mesophyll resistance of the same order of magnitude as the stomatal resistance was necessary to explain the observed uptake rate.

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Language(s): eng - English
 Dates: 2002-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 18185
ISI: 000180466200017
DOI: 10.1029/2001JD000654
 Degree: -

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Title: Journal of Geophysical Research
  Alternative Title : J. Geophys. Res.
Source Genre: Journal
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Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 107 (D20) Sequence Number: 8060 Start / End Page: - Identifier: ISSN: 0747-7309