Determination of NOx emissions from Frankfurt Airport by optical
spectroscopy (DOAS) – A feasibility study
Erna Frins1, Reza Shaiganfar2, Ulrich Platt3, and Thomas Wagner21Instituto de Física, Facultad de Ingeniería, Universidad de la República, Julio Herrera y Reissig 565, Montevideo, Uruguay 2Max-Planck Institut für Chemie, 55128 Mainz, Germany 3Institut für Umweltphysik, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
Received: 29 Jul 2016 – Accepted for review: 02 Aug 2016 – Discussion started: 09 Aug 2016
Abstract. Standard methods like in-situ measurements can hardly register NOx (= NO + NO2) emissions from aircrafts during take-off, when engines run at high load and thus an important amount of fuel is consumed and most of the harmful emissions are produced . The goal of this work is to show that it is possible to measure aircraft emissions generated during take-off (and initial part of the climb) by a remote spectroscopic method like automobile – based – Differential Optical Absorption Spectroscopy (Mobile-DOAS), which uses scattered solar radiation in the blue spectral range (around 445 nm). In order to test its feasibility, total column measurements of NO2 encircling Frankfurt Airport were carried out on 23 February 2012 using Mobile-DOAS. Also, NOx fluxes were derived from the NO2 observations. Unlike standard mobile-DOAS measures using a spectrometer looking at zenith, the measurements were performed looking at 22° elevation angle leading to a roughly two to three times higher sensitivity compared to zenith observations. The origin of the observed NO2 is discussed and the total NOx fluxes are calculated. As result of three round-trips encircling the Frankfurt Airport, the mean NOx flux was found to correlate with the number of aircrafts taking-off. Our results demonstrate that mobile-DOAS method is suitable for quantifying emissions from airports and to study their impact in the planetary boundary layer, which is most relevant concerning the impact on the environment and the human health.
Frins, E., Shaiganfar, R., Platt, U., and Wagner, T.: Determination of NOx emissions from Frankfurt Airport by optical
spectroscopy (DOAS) – A feasibility study, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-255, in review, 2016.