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Tropospheric ozone from IASI: comparison of different inversion algorithms and validation with ozone sondes in the northern middle latitudes [Discussion paper]
Title: Tropospheric ozone from IASI: comparison of different inversion algorithms and validation with ozone sondes in the northern middle latitudes [Discussion paper]
Authors: Keim, C.Eremenko, M.Orphal, JohannesDufour, G.Flaud, J.-M.Höpfner, M.Boynard, A.Clerbaux, C.Payan, S.Coheur, P.-F.Hurtmans, D.Claude, H.Dier, H.Johnson, BryanKelder, H.Kivi, RigelKoide, T.López Bartolomé, MaríaAutor AEMETLambkin, K.Moore, D.Schmidlin, Frank J.Stübi, Rene
Keywords: Tropospheric ozone; IASI satellite instrument; Inversion algorithms; Infrared Atmospheric Sounding Interferometer; Ozono troposférico; Interferómetro Espacial Infrarrojo; Algoritmos
Issue Date: 2009
Publisher: European Geosciences Union
Citation: Atmospheric Chemistry and Physics Discussions. 2009, p. 11441–11479
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Abstract: This paper presents a first statistical validation of tropospheric ozone products derived from measurements of the IASI satellite instrument. Since the end of 2006, IASI (Infrared Atmospheric Sounding Interferometer) aboard the polar orbiter Metop-A measures infrared spectra of the Earth's atmosphere in nadir geometry. This validation covers the northern mid-latitudes and the period from July 2007 to August 2008. Retrieval results from four different sources are presented: three are from scientific products (LATMOS, LISA, LPMAA) and the fourth one is the pre-operational product distributed by EUMETSAT (version 4.2). The different products are derived from different algorithms with different approaches. The difference and their implications for the retrieved products are discussed. In order to evaluate the quality and the performance of each product, comparisons with the vertical ozone concentration profiles measured by balloon sondes are performed and lead to estimates of the systematic and random errors in the IASI ozone products (profiles and partial columns). A first comparison is performed on the given profiles; a second comparison takes into account the altitude dependent sensitivity of the retrievals. Tropospheric columnar amounts are compared to the sonde for a lower tropospheric column (surface to about 6 km) and a "total" tropospheric column (surface to about 11 km). On average both tropospheric columns have small biases for the scientific products, less than 2 Dobson Units (DU) for the lower troposphere and less than 1 DU for the total troposphere. The comparison of the still pre-operational EUMETSAT columns shows higher mean differences of about 5 DU.
Sponsorship : Since June 2007 funding from the Environmental Protection Agency (EPA, Reference Number: 2006-AQ-MS-50) has allowed Valentia Observatory to extend its Ozonesonde launches to a year round weekly programme.
ISSN: 1680-7367
Appears in Collections:Artículos científicos 2005-2009

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