Ozone mapping and expected products by ODUS

The Ozone Dynamics Ultraviolet Spectrometer (ODUS) will be on board the GCOM (Global Change Observation Mission)-A1 satellite. The main objectives of the ODUS mission are global mapping of total ozone field, monitoring of volcanic sulfur dioxide (SO/sub 2/), surface UV-B, and surface albedo. The total ozone will be derived in high accuracy of about 2% with a spatial resolution of 20 km /spl times/20 km at nadir view. By combining data obtained by ODUS and other instruments (SOFIS and SWIFT) on board GCOM-A1, the dynamical features of stratosphere will be revealed using ozone as a tracer. The tropospheric ozone field will also be derived. Spectroscopic measurement of solar scattered UV from the Earth's atmosphere by ODUS also makes it possible to derive SO/sub 2/ and NO/sub 2/ over polluted atmospheric conditions. Other minor constituents such as BrO, OClO, and HCHO will also be measured. Information on aerosol amount and their types over land area are also research targets of the ODUS instrument. As for the system design of ODUS, investigations are extensively made from many aspects to construct a light and low power consumption sensor with high performance for measuring the UV spectra. The algorithm development is also important and started.