HR: 1340h
AN: B43A-0122 [Abstracts]
TI: Controls on Leaf Level Isoprene Emission Rates in a Tropical Rainforest
AU: * Potosnak, M J
EM: mark.potosnak@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89509
United States
AU: Karl, T
EM: tomkarl@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr, Boulder, CO 80305
United States
AU: Harley, P
EM: harley@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr, Boulder, CO 80305
United States
AU: Greenberg, J
EM: greenber@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr, Boulder, CO 80305
United States
AU: Guenther, A
EM: guenther@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr, Boulder, CO 80305
United States
AU: Geron, C
EM: geron.chris@epa.gov
AF: Environmental Protection Agency, USEPA Mailroom, Research Triangle Pa, NC 27711
United States
AU: Artaxo, P
EM: artaxo@if.usp.br
AF: Instituto de Fisica
Universidade de Sao Paulo, Rua do Matao, Travessa R, 187, Sao Paulo, SP 05508-900
Brazil
AB:
Previous studies have found dramatic seasonal changes in both leaf level and whole system isoprene emission rates from
tropical rainforests. Modeling these variations is crucial since the isoprene produced by tropical ecosystems accounts for a
large fraction of the global budget. These studies found that basal isoprene emission rates increased by a factor of 2 from
the wet to the dry season. Research in mid latitudes has shown that the temperature of the previous 48 hours influences
isoprene emission rates. The current study investigates whether the algorithms developed for mid latitude forests can explain
observed variations in leaf level isoprene emission rates during the transition from the dry to the wet season. Information
on leaf level and whole system isoprene emission rates is compared to meteorological information and leaf level
photosynthetic performance. Additional constraints are obtained from level water potential measurements.
DE: 3307 Boundary layer processes
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0315 Biosphere/atmosphere interactions
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting