The HOAPS-3 climatology

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Presentation transcript:

The HOAPS-3 climatology Stephan Bakan1, Axel Andersson1, Karsten Fennig3, Hartmut Grassl2, Christian Klepp2, Jörg Schulz4 1 Max Planck Institute for Meteorology, Hamburg 2 University of Hamburg, 3 German Weather Service (DWD), Offenbach, 4EUMETSAT, Darmstadt, all Germany HOAPS - Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data HOAPS is a climatology of freshwater flux over the global ocean derived from satellite data: data availability: 1987-2005 precipitation, evaporation and related surface and atmospheric parameters radiometers on board polar orbiting satellites: - SSM/I (passive microwave) - AVHRR (infrared, SST only) state of the art parameter retrieval procedures homogeneous time series: Multi satellite averages, containing all SSM/I operating at the same time, including inter-sensor calibration Scan-based, pixel-level dataset (HOAPS-S) gridded (HOAPS-G, HOAPS-C) datasets , resolution 0.5°, pentad and monthly means, daily composites data accessible under: www.hoaps.org References: Andersson, A., C. Klepp, K. Fennig, S. Bakan, H. Graßl, and J. Schulz, 2010: The Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data – HOAPS-3. Earth Syst. Sci. Data, 1, 1-20, doi:10.5194/essdd-3-143-2010 Andersson, A., C. Klepp, K. Fennig, S. Bakan, H. Graßl, and J. Schulz, 2010: Evaluation of HOAPS-3 ocean surface freshwater flux components. J. Appl. Meteor. Climatol., doi: 0.1175/2010JAMC2341.1, in print Statistical approach on brightness temperature (TB) basis: calibration reference: DMSP F-11 10-day means of TBs averaged on a global 1°x1° grid, rain-free pixels only match-ups for each channel and satellite with F-11 for one overlapping year histogram-equalization of match-ups linear regression for TB calibration coefficients of each channel and satellite SSM/I intercalibration: Data processing chain: HOAPS-3 parameters and algorithms: Water flux parameters: Precipitation (P): neural net with training data from radiative transfer calculations (ECMWF, P. Bauer) Evaporation (E): Bulk formula: E = (ρa/ρw) CE U (qs – qa) Wind speed (U) (neural net) Near surface specific humidity (qa) (Bentamy et al., 2003) Sea surface saturation specific humidity (qs) (SST, Magnus formula) Latent heat transfer coefficient (CE) (COARE; Fairall et. al., 1996/2003) Freshwater Flux: E-P Climatological mean global fields (left) and annual cycle of zonal mean (right) of precipitation, evaporation and freshwater flux (E-P) HOAPS-3 is a well developed satellite climatology of water cycle components over the ice free global ocean, showing all the known global climatological features and regional details HOAPS 3 is publicly available from www.hoaps.org In near future, some of the core HOAPS products will be routinely provided by the Eumetsat Climate Monitoring Satellite Application Facility (CM-SAF, www.cmsaf.eu) at the German Weather Service (DWD) Conclusions: