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Lightning-produced NOx during the Northern Australian monsoon; results from the ACTIVE campaign

Labrador, L. and Vaughan, G. and Heyes, W. and Waddicor, D. and Volz-Thomas, A. and Pätz, H.W. and Höller, H. (2009) Lightning-produced NOx during the Northern Australian monsoon; results from the ACTIVE campaign. Atmospheric Chemistry and Physics, 9 (19), pp. 7419-7429. Copernicus Publications.

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Official URL: http://www.atmos-chem-phys.net/9/7419/2009/acp-9-7419-2009.html

Abstract

Measurements of nitrogen oxides onboard a high altitude aircraft were carried out for the first time during the Northern Australian monsoon in the framework of the Aerosol and Chemical Transport in Tropical Convection (ACTIVE) campaign, in the area around Darwin, Australia. During one flight on 22 January 2006, average NOx volume mixing ratios (vmr) of 984 and 723 parts per trillion (ppt) were recorded for both in and out of cloud conditions, respectively. The in-cloud measurements were made in the convective outflow region of a storm 56 km south-west of Darwin, whereas those out of cloud were made due south of Darwin and upwind from the storm sampled. This storm produced a total of only 8 lightning strokes, as detected by an in-situ lightning detection network, ruling out significant lightning-NOx production. 5-day backward trajectories suggest that the sampled airmasses had travelled over convectively-active land in Northern Australia during that period. The low stroke count of the sampled storm, along with the high out-of-cloud NOx concentration, suggest that, in the absence of other major NOx sources during the monsoon season, a combination of processes including regional transport patterns, convective vertical transport and entrainment may lead to accumulation of lightning-produced NOx, a situation that contrasts with the pre-monsoon period in Northern Australia, where the high NOx values occur mainly in or in the vicinity of storms. These high NOx concentrations may help start ozone photochemistry and OH radical production in an otherwise NOx-limited environment.

Document Type:Article
Title:Lightning-produced NOx during the Northern Australian monsoon; results from the ACTIVE campaign
Authors:
AuthorsInstitution or Email of Authors
Labrador, L.Univ. of Manchester, UK
Vaughan, G.Univ. of Manchester, UK
Heyes, W.Univ. of Manchester, UK
Waddicor, D.Univ. of Manchester, UK
Volz-Thomas, A.FZ, Jülich
Pätz, H.W.FZ, Jülich
Höller, H.DLR
Date:2009
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:9
Page Range:pp. 7419-7429
Publisher:Copernicus Publications
Status:Published
Keywords:Lightning, NOx, Monsoon
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Dr.rer.nat. Hartmut Höller
Deposited On:20 Jan 2010 10:40
Last Modified:12 Dec 2013 20:52

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