Hi Kevin: why so you use an aggregation element here, when theres only one dataset? <dataset ID="hfls_monthly_1to2x-0_R1_00010101-02801231" name="hfls" urlPath="hfls_monthly_1to2x-0_R1_00010101-02801231"> <serviceName>thisDODS</serviceName> <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2"> <aggregation dimName="time" type="joinExisting"> <netcdf location="file:/data/gfdl_cm2_0/CM2Q-d2_1PctTo2x_i1/pp/atmos/ts/monthly/hfls_A1.000101-028012.nc" ncoords="3360" /> </aggregation> </netcdf> </dataset>