t-statistic for global average:
                     temperature at 1.5m  0.468
        total precipitation rate kg/m2/s  0.014
              pressure at mean sea level -0.545
     potential temperature (ocean) deg.c -0.024
          salinity (ocean) (psu-35)/1000  0.637
                aice : ice concentration -0.774

Proportion of area with |t|>2
                     temperature at 1.5m  0.055
        total precipitation rate kg/m2/s  0.062
              pressure at mean sea level  0.068
     potential temperature (ocean) deg.c  0.055
          salinity (ocean) (psu-35)/1000  0.084
                aice : ice concentration  0.112