HR: 08:35h
AN: AE21A-04 INVITED [Abstracts]
TI: Nitrogen Oxides from Thunderstorms - First Results from TROCCINOX
AU: * Schumann, U
EM: ulrich.schumann@dlr.de
AF: DLR Institute of Atmospheric Physics, Oberpfaffenhofen, PO Box 1116, Wessling, 82230
Germany
AU: Schlager, H
EM: hans.schlager@dlr.de
AF: DLR Institute of Atmospheric Physics, Oberpfaffenhofen, PO Box 1116, Wessling, 82230
Germany
AU: Chaboureau, J P
EM: chajp@aero.obs-mip.fr
AF: Laboratoire d'Aerologie, OMP, 14 Avenue Ed Belin, Toulouse, 31400
France
AU: Fehr, T
EM: thorsten.fehr@dlr.de
AF: DLR Institute of Atmospheric Physics, Oberpfaffenhofen, PO Box 1116, Wessling, 82230
Germany
AU: Held, G
EM: gerhard@ipmet.unesp.br
AF: Instituto de Pesquisas Meteorologicas (IPMET), Universidade Estadual Paulista (UNESP),
CX Postal, 281
, Bauru, 17001-970
Brazil
AU: Hoeller, H
EM: hartmut.hoeller@dlr.de
AF: DLR Institute of Atmospheric Physics, Oberpfaffenhofen, PO Box 1116, Wessling, 82230
Germany
AU: Huntrieser, H
EM: heidi.huntrieser@dlr.de
AF: DLR Institute of Atmospheric Physics, Oberpfaffenhofen, PO Box 1116, Wessling, 82230
Germany
AU: Kurz, C
EM: Christian.Kurz@dlr.de
AF: DLR Institute of Atmospheric Physics, Oberpfaffenhofen, PO Box 1116, Wessling, 82230
Germany
AU: Lawrence, M G
EM: lawrence@mpch-mainz.mpg.de
AF: Max Planck Institute of Chemistry, Postfach 3060, Mainz, 55020
Germany
AU: Luo, B
EM: beiping.luo@env.ethz.ch
AF: ETH Institute for Atmospheric and Climate Science, Hoenggerberg HPP L8.2, Zuerich, 8093
Switzerland
AU: Pommereau, J P
EM: pommereau@aerov.jussieu.fr
AF: Service d'Aeronomie du CNRS, BP 3, Verrieres le Buisson, 91371
France
AU: Meijer, E
EM: meijere@knmi.nl
AF: KNMI, P.O. Box 201, De Bilt, 3730
Netherlands
AB:
Within the EU-project "Tropical Convection, Cirrus and Nitrogen Oxides Experiment" (TROCCINOX), in cooperation with the
Brazilian project TROCCIBRAS, lightning induced NOx has been measured at altitudes up to 12.5 km in the outflow from
continental thunderstorms in the tropics in February/March 2004. Thunderstorms in both subtropical and tropical air masses
were sampled. In tropical air masses, high NO and CO background mixing ratios were observed. In the anvil outflow, spiky NO
structures (maximum 65 nmol/mol) above background were observed. Some of the spikes were notably wide (order several 10 km)
indicating outflow from a thunderstorm anvil, others were narrow (order 200 m) clearly originating from fresh lightning
events. From the still preliminary analysis of the few cases it appears that the subtropical and tropical TROCCINOX
thunderstorms exhibit similarly enhanced nitrogen oxides concentrations (0.5-1.9 nmol/mol) and mass fluxes (1.1-2.0 x 10**8
kg/s) as found in the LINOX/EULINOX thunderstorms. The three TROCCINOX case studies indicate global lightning-NOx production
rates between 2 and 9 Tg(N)/yr. These are lower limit estimates because of missing data above 12.5 km altitude. A further
campaign with measurements at higher altitudes is under preparation. Preliminary model studies show that matching the
measured NOx data is very demanding.
UR: http://www.pa.op.dlr.de/troccinox/
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0320 Cloud physics and chemistry
DE: 0330 Geochemical cycles
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric and Space Electricity [AE]
MN: 2004 AGU Fall Meeting