Co-ordinated validation activity and quality assessment of MIPAS-ENVISAT Ozone data
Ugo Cortesi(1), Cornelis Blom(2), Thomas Blumenstock(3), Ian Boyd(4), Astrid Bracher(5), Claude Camy-Peyret(6), Jayanarayanan Kuttippurath(7), Coralie De Clercq(8), Marco Iarlori(9), Jean-Christopher Lambert(10), Yasjka Meijer(11), Hermann Oelhaf(2), Gianluca Redaelli(12), Ivan Kostadinov(13), Fabrizio Ravegnani(13), Chiara Piccolo(14), Michel Pirre(15), Gottfried Schwarz(16), Harjinder Sembhi(17), Tilman Steck(18), Kimberly Strong(19), Corinne Vigouroux(10), Konstantinos Varotsos(20), Alison Waterfall(21), Francesco Mencaraglia(1) and Kelly Chance(22)
(1) IFAC-CNR, Via Madonna del Piano, 10, 50019 Sesto Fiorentino (Firenze), Italy
(2) IMK-FZK, Postfach 3640, D-76021 Karlsruhe, Germany
(3) IMK-FZK, Postfach 3460, D-76021 Karlsruhe, Germany
(4) NIWA ERI, 710 North Pleasant St, Amherst, MA 01002, United States
(5) IUP-University of Bremen, PO Box 330440, D-28334 Bremen, Germany
(6) LPMA-CNRS, 4 Place Jussieu, F-75252 Paris Cedex 05, France
(7) LMD-CNRS, Ecole polytechnique, F-91128 Palaiseau Cedex, France
(8) Institut d'Aéronomie Spatiale de Belgique, 3 Avenue Circulaire, B-1180 Brussels, Belgium
(9) Università degli Studi di L'Aquila, Via Vetoio, 10, 67010 Coppito-L'Aquila, Italy
(10) Institut d'Aéronomie Spatiale de Belgique, Avenue Circulaire 3, 1180 Bruxelles, Belgium
(11) RIVM, Postbus 1, 3720 BA Bilthoven, Netherlands
(12) Università degli Studi di L'Aquila, , L'Aquila, Italy
(13) ISAC-CNR, Via Gobetti, 101, 40129 Bologna, Italy
(14) University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
(15) LPCE-CNRS - Université d'Orleans, 3A Avenue de la Recherche Scientifique, 45071 Orléans Cedex, France
(16) DLR Institut für Methodik der Fernerkundung, Box 1116, 82230 Wessling, Germany
(17) University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
(18) IMK-FZK, PostFach 3640, D-76021 Karlsruhe, Germany
(19) University of Toronto, 60 St. George Street, Toronto, Ontario, M5S 1A7, Canada
(20) University of Athens, University Campus, Bldg Phys 5, 15784 Athens, Greece
(21) CCLRC-RAL, Chilton-Didcot, Oxfrodshire OX11 0QX, United Kingdom
(22) Harvard-Smithsonian Center for Astrophysics, 60 Garden Str., Cambridge MA 02138, United States
Launched on March 1st, 2002 on-board the polar orbiting ENVISAT satellite, the MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) mid-infrared FT spectrometer performed limb emission measurements at high spectral resolution (0.025 cm-1) for about two years. Due to too frequent anomalies observed in the Interferometer Drive Unit, operations were suspended in March 2004 and finally resumed, in January 2005, in a new reduced resolution (0.01 cm-1) mode.
Operational level 2 products for the complete set of target species (i.e. geo-located vertical profiles of Temperature and volume mixing ratio of H2O, O3, HNO3, CH4, N2O and NO2) were obtained during MIPAS full resolution mission, from July 6th, 2002 to March 26th, 2004.
In this timeframe, several research groups involved in the ESA programme for geophysical validation of the ENVISAT Atmospheric Chemistry Instruments and in related national activities, carried out a variety of ground-based observations (ozone soundings, FT-IR, microwave radiometers, lidars) of the ozone vertical distribution and of in situ and remote sensing measurements from high altitude platforms, in close spatial and temporal coincidence with MIPAS overpasses. As a result, a comprehensive database of correlative measurements became available for a first inter-comparison of MIPAS O3 profiles with various datasets from coincident observations.
A co-ordinated effort was finally conducted to bring together the individual outcomes of the different validation activities and to better exploit their redundant and complementary information. In the latter phase, special attention was paid to rigorous selection and use of correlative data, by adopting stringent coincidence criteria and by giving top priority to homogeneous and reliable validation data sources.
Here we report a brief overview of the validation of MIPAS O3 data versions 4.61 and 4.62 (fully equivalent for validation purposes) by ground-based, balloon/aircraft and satellite measurements and discuss in details the resulting quality assessment of MIPAS O3 retrieved profiles.
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,