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          Institute: MPI für Chemie     Collection: Publikationen MPI für Chemie     Display Documents

ID: 18185.0, MPI für Chemie / Publikationen MPI für Chemie
Exchange fluxes of NO2 and O3 at soil and leaf surfaces in an Amazonian rain forest
Authors:Gut, A.; Scheibe, M.; Rottenberger, S.; Rummel, U.; Welling, M.; Ammann, C.; Kirkman, G. A.; Kuhn, U.; Meixner, F. X.; Kesselmeier, J.; Lehmann, B. E.; Schmidt, W.; Müller, E.; Piedade, M. T. F.
Date of Publication (YYYY-MM-DD):2002-09
Title of Journal:Journal of Geophysical Research
Journal Abbrev.:J. Geophys. Res.
Issue / Number:D20
Sequence Number of Article:8060
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:nitrogen oxides; ozone; deposition; flux techniques; rainforest; Amazonia
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Chemie/Biogeochemie
External Affiliations:Univ Bern, Inst Phys, CH-3012 Bern, Switzerland; Univ Oldenburg, Dept Biol Geo & Environm Sci, D-26111 Oldenburg, Germany; Max Planck Inst Limnol, Trop Ecol Work Grp, D-24302 Plon, Germany; Inst Nacl de Pesquisas da Amazonia, BR-69011970 Manaus, Amazonas, Brazil
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