Information about dataset 225

Unqualified dataset name cmems-topaz
Full dataset name ADC/cmems-topaz
abstract The operational TOPAZ4 Arctic Ocean system uses the HYCOM model and a 100-member EnKF assimilation scheme. It is run daily to provide 10 days of forecast (one single member) of the 3D physical ocean, including sea ice; data assimilation is performed weekly to provide 7 days of analysis (ensemble average). Operational Ocean General Circulation Models describe routinely the 4D evolution of the physical ocean and sea ice variables, such as temperature, salinity, currents, sea level height, sea ice thickness and concentration. The TOPAZ system has provided analyses and forecasts for the Atlantic and Arctic Basins since 2003, assimilating available satellite and in situ observations. The current version of the TOPAZ system - TOPAZ4 - uses the latest version of the Hybrid Coordinate Ocean Model (HYCOM) developed at University of Miami (Bleck 2002). HYCOM is coupled to a sea ice model; ice thermodynamics are described in Drange and Simonsen (1996) and the elastic-viscous-plastic rheology in Hunke and Dukowicz (1997). The model's native grid covers the Arctic and North Atlantic Oceans, is obtained by comformal mapping and has fairly homogeneous horizontal spacing (between 11 and 16 km). 28 hybrid layers are used in the vertical (z-isopycnal). TOPAZ4 uses the Ensemble Kalman filter (EnKF; Sakov and Oke 2008) to assimilate remotely sensed sea level anomalies, sea surface temperature, sea ice concentration, lagrangian sea ice velocities (winter only), as well as temperature and salinity profiles from Argo floats. From V2, all assimilation data are acquired from the relevant MyOcean Thematic Assembly Centres: Sea Level TAC, Sea Surface Temperature TAC, Ocean and Sea Ice TAC and In Situ TAC. In this connection, the V2 system was reinitialized with respect to the V1 system. The output consists of daily mean fields interpolated onto standard grids in NetCDF CF format. Variables include 3D currents (U, V), temperature and salinity, as well as 2D fields of sea ice parameters, sea surface height, mixed layer depth and more. From V5 the ice model is upgraded: thermodynamics module changed to Lisæter (2009); correction of the EVP rheology, following Bouillon et al. (2013); retune drag coefficients to reduce positive bias in ice drift velocities. You need to register in the Copernicus Marine Environment Monitoring Service to get access to TOPAZ data.
activity_type Model run
area Nordic Seas, Arctic Ocean
bounding_box 180,50,-180,90
Conventions CF
data_file_location FIXME
data_file_size FIXME
datacollection_period 2011-10-19 to current
dataref_FTP URL
dataset_name ADC cmems-topaz
distribution_statement CC BY/NLOD
file_format NetCDF/CF
history 2015-06-18 creation
institution Norwegian Meteorological Institute (
operational_status operational
PI_name Bruce Hackett
product_name CMEMS TOPAZ
project_name Copernicus Marine Environment Monitoring Service (CMEMS)
title CMEMS TOPAZ Arctic Ocean Model
topiccategory oceans
variable FIXME