// create runtime aggregation coordinate variable
DataType coordType = DataType.DOUBLE; // LOOK getCoordinateType();
VariableDS runtimeCoordVar = new VariableDS(result, null, null, runtimeDimName, coordType, runtimeDimName, null, null);
runtimeCoordVar.addAttribute(new Attribute("long_name", "Run time for ForecastModelRunCollection"));
runtimeCoordVar.addAttribute(new ucar.nc2.Attribute("standard_name", "forecast_reference_time"));
runtimeCoordVar.addAttribute(new ucar.nc2.Attribute("units", "hours since " + dateFormatter.toDateTimeStringISO(lite.base)));
runtimeCoordVar.addAttribute(new ucar.nc2.Attribute(_Coordinate.AxisType, AxisType.RunTime.toString()));
result.removeVariable(null, runtimeCoordVar.getShortName());
result.addVariable(null, runtimeCoordVar);
if (logger.isDebugEnabled()) logger.debug("FmrcDataset: added runtimeCoordVar " + runtimeCoordVar.getFullName());