Analysis Support

This site provides offline tools and online applications for data analysis and visualization, especially for those data included in the Global Environmental Database (GED) at the Center for Global Environmental Research (CGER). The online trend analysis application let users quickly extract seasonal variations and inter-annual trends from their time series observations. The air trajectory application for single Lagrangian particle can be both used online and downloaded for offline use. An application server at CGER has prepared several meteorological datasets for air trajectory computing. The footprint application implemented a Lagrangian particle dispersion model to compute the residence time of particles released simultaneously at a location. The residence time near the surface is often considered the footprint that establishes the source-sink relation for a tracer. The GED includes computed trajectory and footprint results for CGER's monitoring stations. Figure 1 show examples of observed atmospheric pCO2 variation at Hateruma Station, a 10-day back air trajectory corresponding to the time of marked pCO2 concentration, and a footprint contour map of the same time.

The Center for Global Environmental Research also maintain a site that supports data query and visualization of the WDCGG database and provides quick access to greenhouse gases concentrations from CGER's monitoring stations. Now hourly CO2 concentration data from Hateruma and Ochiishi stations are being updated in real time. From this site you can see the most up-to-date annual CO2 increase rate; CO2 concentrations of daily mean, weekly mean, monthly mean, and annual mean; and hourly variations of CO2 concentrations in the past week, month, and year.

Fig.1 Footprint
Trajectory Animation
Fig.2 Trajectory Animation