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Regional lightning NOx sources during the TROCCINOX experiment

Mari, C. and Chaboureau, J.P. and Pinty, J.P. and Duron, J. and Mascart, P. and Cammas, J.P. and Gheusi, F. and Fehr, T. and Schlager, H. and Roiger, A. and Lichtenstern, M. and Stock, P. (2006) Regional lightning NOx sources during the TROCCINOX experiment. Atmospheric Chemistry and Physics, 6, pp. 5559-5572.

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Official URL: http://www.atmos-chem-phys.net/6/5559/2006

Abstract

A lightning NOx (LiNOx) source has been implemented in the deep convection scheme of the Meso-NH mesoscale model following a mass-flux formalism coherent with the transport and scavenging of gases inside the convective scheme. In this approach the vertical transport of NO inside clouds is calculated by the parameterization of deep convective transport, thus eliminating the need for apriori LiNOx profiles. Once produced inside the convective column, NO molecules are redistributed by updrafts and downdrafts and detrained in the environment when the conditions are favorable. The model was applied to three particular flights during the Tropical Convection, Cirrus and Nitrogen Oxides (TROCCINOX) campaign over the tropical area around Bauru on 3-4 March 2004. The convective activity during the three flights was investigated using brightness temperature at 10.7μm observed from GOES-12 satellite. The use of a model-to-satellite approach reveals that the simulation appears rather realistic compared to the observations. The diurnal cycle of the simulated brightness temperature, CAPE, number of IC flashes, NO entrainment flux are in phase, with a succession of three marked peaks at 18:00 UTC (15:00 LT). These simulated peaks precede the observed afternoon one by about three hours. Comparison of the simulated NOx with observations along the flight tracks show that the model reproduces well the observed NOx levels when the LiNOx source is applied. The budget of entrainment, detrainment and LiNOx convective fluxes shows that the majority of the NO detrained back to the environment comes from lightning source inside the convective columns. Entrainment of NO from the environment and vertical transport from the boundary layer were not significant during the episode. The troposphere is impacted by detrainment fluxes of LiNOx from 4 km altitude to 16 km with maximum values around 14 km altitude. Detrainment fluxes vary between 75 kg(N)/s during nighttime to 400 kg(N)/s at the times of maximun convective activity. Extrapolation of the regional LiNOx source would yield a global LiNOx production around 5.7 Tg(N)/year which is within the current estimates but should not hide the overestimation of the number of flash rates by the model.

Document Type:Article
Title:Regional lightning NOx sources during the TROCCINOX experiment
Authors:
AuthorsInstitution or Email of Authors
Mari, C.UMR CNRS/UPS, Toulouse, F
Chaboureau, J.P.UMR CNRS/UPS, Toulouse, F
Pinty, J.P.UMR CNRS/UPS, Toulouse, F
Duron, J.UMR CNRS/UPS, Toulouse, F
Mascart, P.UMR CNRS/UPS, Toulouse, F
Cammas, J.P.UMR CNRS/UPS, Toulouse, F
Gheusi, F.UMR CNRS/UPS, Toulouse, F
Fehr, T.UNSPECIFIED
Schlager, H.UNSPECIFIED
Roiger, A.UNSPECIFIED
Lichtenstern, M.UNSPECIFIED
Stock, P.UNSPECIFIED
Date:11 December 2006
Journal or Publication Title:Atmospheric Chemistry and Physics
Volume:6
Page Range:pp. 5559-5572
Status:Published
Keywords:Lightning, nitrogen oxides, convection
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Helga Jesse
Deposited On:09 Mar 2007
Last Modified:12 Dec 2013 20:22

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