Abstract
Abstract. The Odin satellite carries two instruments capable of determining stratospheric ozone profiles by limb sounding: the Sub-Millimetre Radiometer (SMR) and the UV-visible spectrograph of the OSIRIS (Optical Spectrograph and InfraRed Imager System) instrument. A large number of ozone profiles measurements were performed during six years from November 2001 to present. This ozone dataset is here used to make quantitative comparisons with satellite measurements in order to assess the quality of the Odin/SMR ozone measurements. In a first step, we compare Swedish SMR retrievals version 2.1, French SMR ozone retrievals version 222 (both from the 501.8 GHz band), and the OSIRIS retrievals version 3.0, with the operational version 4.0 ozone product from POAM III (Polar Ozone Atmospheric Measurement). In a second step, we refine the Odin/SMR validation by comparisons with ground-based instruments and balloon-borne observations. We use observations carried out within the framework of the Network for Detection of Atmospheric Composition Change (NDACC) and balloon flight missions conducted by the Canadian Space Agency (CSA), the Laboratoire de Physique et de Chimie de l\\'{}Environnement (LPCE, Orléans, France), and the Service d'Aéronomie (SA, Paris, France). Coincidence criteria were 5° in latitude×10° in longitude, and 5 h in time in Odin/POAM III comparisons, 12 h in Odin/NDACC comparisons, and 72 h in Odin/balloons comparisons. An agreement is found with the POAM III experiment (10–60 km) within −0.3±0.2 ppmv (bias±standard deviation) for SMR (v222, v2.1) and within −0.5±0.2 ppmv for OSIRIS (v3.0). Odin ozone mixing ratio products are systematically slightly lower than the POAM III data and show an ozone maximum lower by 1–5 km in altitude. The comparisons with the NDACC data (10–34 km for ozonesonde, 10–50 km for lidar, 10–60 for microwave instruments) yield a good agreement within −0.15±0.3 ppmv for the SMR data and −0.3±0.3 ppmv for the OSIRIS data. Finally the comparisons with instruments on large balloons (10–31 km) show a good agreement, within −0.7±1 ppmv. The official SMR v2.1 dataset is consistent in all altitude ranges with POAM III, NDACC and large balloon-borne instruments measurements. In the SMR v2.1 data, no different systematic error has been found in the 0–35km range in comparison with the 35–60 km range. The same feature has been highlighted in both hemispheres in SMR v2.1/POAM III intercomparisons, and no latitudinal dependence has been revealed in SMR v2.1/NDACC intercomparisons.
Highlights
Satellite sensors play a crucial role in monitoring the chemical and dynamic structure of the atmosphere thanks to their global spatial and temporal coverage
This paper is structured in the following manner: (2) a brief description of the Odin mission, (3) statistical monthly intercomparisons of zonally-averaged coincident Sub-Millimetre Radiometer (SMR), Optical Spectrograph and InfraRed Imager System (OSIRIS) and Polar Ozone and Aerosol Measurement (POAM) III stratospheric ozone profiles, (4) an evaluation of Odin SMR/OSIRIS ozone measurements against results obtained from well-established and validated ground-based instruments and remote sensors operated onboard stratospheric balloons, providing accurate measurements but with a rather limited coverage in space and time, (5) discussion of the results and concluding remarks
The Sub-Millimeter-Radiometer on board the Odin satellite, launched in February 2001, provides a quasi-continuous global dataset of stratospheric ozone profiles starting in November 2001
Summary
Satellite sensors play a crucial role in monitoring the chemical and dynamic structure of the atmosphere thanks to their global spatial and temporal coverage. Validation of space-borne sensors is usually carried out with a large amount of correlative data, including high vertical resolution balloon-borne and ground-based measurements with known accuracy, which ideally cover all seasons to obtain good statistics from the comparisons. The SMR ozone profiles are compared on a monthly basis with data retrieved from the space-borne instruments OSIRIS and POAM III and with ground-based instruments of the Network for Detection of Atmospheric Composition Change (NDACC). This paper is structured in the following manner: (2) a brief description of the Odin mission, (3) statistical monthly intercomparisons of zonally-averaged coincident SMR, OSIRIS and POAM III stratospheric ozone profiles, (4) an evaluation of Odin SMR/OSIRIS ozone measurements against results obtained from well-established and validated ground-based instruments and remote sensors operated onboard stratospheric balloons, providing accurate measurements but with a rather limited coverage in space and time, (5) discussion of the results and concluding remarks
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