Danish Meteorological Institute
نویسنده
چکیده
The present report describes the determination of a set of monthly tiepoints for use in sea ice retrieval by passive microwave radiometry. From archived DMSP F-13 SSM/I data from 1996 and 1997 as well as surface temperatures from the NCEP reanalysis, emissivities are computed and analysed on a 250x250 km grid. The results are sets of monthly tiepoints for First Year ice and Open Water extracted over the Arctic Ocean, the Baffin Bay and the Bal-tic as well as a set of monthly tiepoints for Multi Year ice valid for the Arctic Ocean. The tiepoints cover the 19V, 19H, 37V, 37H, 85V and 85H channels. The tiepoints over open water are found from Radiative Transfer simulations to be consistent with water vapour and wind climatology. Due to this and the use of emissivity the tiepoints support the use of auxiliary data to eliminate surface temperature and atmospheric influences. Geographical differences between the Arctic and the Baffin Bay are small for the 19 and 37 GHz channels. The differences at 85 GHz in specific and between the Baltic and the Arctic in general are substantial. In the two year data set interannual variation in emissivity is largest in the summer months over Multi Year ice (up to 0.06) while typical differences are 0.01. The analysis reveals large variations in the 85 GHz signature over Multi Year ice, that complicate ice type determination by the use of these channels.
منابع مشابه
DANISH METEOROLOGICAL INSTITUTE TECHNICAL REPORT 00-24 First European Sprite Campaign: EuroSprite 2000 Summary Report
متن کامل
Urban sublayer parameterisations
On the parameterisation of the urban atmospheric sublayer in meteorological models A. Baklanov, P. Mestayer, A. Clappier, S. Zilitinkevich, S. Joffre, A. Mahura, and N. W. Nielsen Meteorological Research Department, Danish Meteorological Institute, DMI, Copenhagen, Denmark Laboratoire de Mécanique des Fluides, UMR CNRS 6598, Ecole Centrale de Nantes, ECN, France La section Sciences et Ingénieri...
متن کاملA Seamless earth - System Prediction Approach in Action
AMerIcAN MeteOrOLOGIcAL SOcIetY | 1357 AffiliAtions: Hazeleger, SeverijnS, Wang, Bintanja, van den Hurk, van noije, Selten, and Sterl—Royal Netherlands Meteorological Institute, De Bilt, The Netherlands; Semmler and mcgratH—Met Éireann, Dublin, Ireland; Ştefănescu—European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom; Yang, cHriStenSen, and ScHmitH—Danish Meteorological In...
متن کاملDANISH METEOROLOGICAL INSTITUTE ───── SCIENTIFIC REPORT ───── 02-16 Methodology for Risk Analysis based on Atmospheric Dispersion Modelling from Nuclear Risk Sites
متن کامل
Remote Sensing of Sea Ice
(1) Norwegian Meteorological Institute, P.O.Box. 43, N-0313 Blindern, Norway, Email: [email protected], [email protected] (2) Canadian Ice Service, 373 Sussex Drive, Block E. Ottawa, ON, Canada, Email: [email protected] (3) British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom, Email: [email protected] (4) Laboratoire d'Oceanographie Spatiale, IFREMER, BP 70...
متن کامل