TY  - CONF
AU  - Stein, Olaf
AU  - Schultz, Martin
AU  - Rambadt, Michael
AU  - Saini, Rajveer
AU  - Hoffmann, Lars
AU  - Mallmann, Daniel
TI  - JADDS – towards a tailored global atmospheric composition data service for CAMS forecasts and reanalysis
M1  - FZJ-2018-00650
PY  - 2017
AB  - Global model data of atmospheric composition produced by the Copernicus Atmospheric Monitoring Service(CAMS) is collected since 2010 at FZ Jülich and serves as boundary condition for use by Regional Air Quality(RAQ) modellers world-wide. RAQ models need time-resolved meteorological as well as chemical lateralboundary conditions for their individual model domains. While the meteorological data usually come fromwell-established global forecast systems, the chemical boundary conditions are not always well defined. In thepast, many models used ‘climatic’ boundary conditions for the tracer concentrations, which can lead to significantconcentration biases, particularly for tracers with longer lifetimes which can be transported over long distances(e.g. over the whole northern hemisphere) with the mean wind. The Copernicus approach utilizes extensivenear-realtime data assimilation of atmospheric composition data observed from space which gives additionalreliability to the global modelling data and is well received by the RAQ communities.An existing Web Coverage Service (WCS) for sharing these individually tailored model results is currently beingre-engineered to make use of a modern, scalable database technology in order to improve performance, enhanceflexibility, and allow the operation of catalogue services. The new Jülich Atmospheric Data Distributions Server(JADDS) adheres to the Web Coverage Service WCS2.0 standard as defined by the Open Geospatial ConsortiumOGC. This enables the user groups to flexibly define datasets they need by selecting a subset of chemical speciesor restricting geographical boundaries or the length of the time series. The data is made available in the formof different catalogues stored locally on our server. In addition, the Jülich OWS Interface (JOIN) providesinteroperable web services allowing for easy download and visualization of datasets delivered from WCS serversvia the internet.We will present the prototype JADDS server and address the major issues identified when relocating large fourdimensionaldatasets into a RASDAMAN raster array database. So far the RASDAMAN support for data availablein netCDF format is limited with respect to metadata related to variables and axes. For community-wide acceptedsolutions, selected data coverages shall result in downloadable netCDF files including metadata complying withthe netCDF CF Metadata Conventions standard (http://cfconventions.org/). This can be achieved by addingcustom metadata elements for RASDAMAN bands (model levels) on data ingestion. Furthermore, an optimizationstrategy for ingestion of several TB of 4D model output data will be outlined.
T2  - European Geosciences Union General Assembly 2017
CY  - 23 Apr 2017 - 28 Apr 2017, Vienna (Austria)
Y2  - 23 Apr 2017 - 28 Apr 2017
M2  - Vienna, Austria
LB  - PUB:(DE-HGF)24
UR  - https://juser.fz-juelich.de/record/842414
ER  -