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Measurements of HONO, NO, NOy and SO2 in aircraft exhaust plumes at cruise

Jurkat, Tina and Voigt, C. and Arnold, F. and Schlager, H. and Kleffmann, J. and Aufmhoff, H. and Schäuble, D. and Schaefer, M. and Schumann, U. (2011) Measurements of HONO, NO, NOy and SO2 in aircraft exhaust plumes at cruise. Geophysical Research Letters, 38 (L10807), pp. 1-5. DOI: 10.1029/2011GL046884.

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Official URL: http://www.agu.org/pubs/crossref/2011/2011GL046884.shtml

Abstract

Measurements of gaseous nitrogen and sulfur oxide emissions in young aircraft exhaust plumes give insight into chemical oxidation processes inside aircraft engines. Particularly, the OHâ��induced formation of nitrous acid (HONO) from nitrogen oxide (NO) and sulfuric acid (H2SO4) from sulfur dioxide (SO2) inside the turbine which is highly uncertain, need detailed analysis to address the climate impact of aviation. We report on airborne in situ measurements at cruise altitudes of HONO, NO, NOy, and SO2 in 9 wakes of 8 different types of modern jet airliners, including for the first time also an A380. Measurements of HONO and SO2 were made with an ITCIMS (Ion Trap Chemical Ionization Mass Spectrometer) using a new ionâ��reaction scheme involving SF5 â�� reagent ions. The measured molar ratios HONO/NO and HONO/NOy with averages of 0.038 �± 0.010 and 0.027 �± 0.005 were found to decrease systematically with increasing NOx emissionâ��index (EI NOx). We calculate an average EI HONO of 0.31 �± 0.12 g NO2 kgâ��1. Using reliable measurements of HONO and NOy, which are less adhesive than H2SO4 to the inlet walls, we derive the OHâ��induced conversion fraction of fuel sulfur to sulfuric acid " with an average of 2.2 �± 0.5 %. " also tends to decrease with increasing EI NOx, consistent with earlier model simulations. The lowestHONO/NO,HONO/NOy and "was observed for the largest passenger aircraft A380.

Document Type:Article
Title:Measurements of HONO, NO, NOy and SO2 in aircraft exhaust plumes at cruise
Authors:
AuthorsInstitution or Email of Authors
Jurkat, TinaTina.Jurkat@dlr.de
Voigt, C.DLR
Arnold, F.DLR
Schlager, H.DLR
Kleffmann, J.Bergische Univ. Wuppertal, Wuppertal
Aufmhoff, H.DLR
Schäuble, D.DLR
Schaefer, M.DLR
Schumann, U.DLR
Date:2011
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:38
DOI:10.1029/2011GL046884
Page Range:pp. 1-5
Status:Published
Keywords:first aircraft-based HONO measurements with an ion trap CIMS first measurements of SO2, HONO, NO and NOy in the wake of an A380 sulphur conversion efficiency depend on EI NOx
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics, Transport
HGF - Program Themes:ATM and Operation, Transport System
DLR - Research area:Aeronautics, Transport
DLR - Program:L AO - Air Traffic Management and Operation, V VS - Verkehrssystem
DLR - Research theme (Project):L - Climate, Weather and Environment, V - Verkehrsentwicklung und Umwelt (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:17 Nov 2011 14:17
Last Modified:12 Dec 2013 21:25

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