ECMWF 40 Year Re-Analysis, monthly surface data Documentation

convective precipitation [m];evaporation [m of water];high cloud cover [(0 - 1)];ice surface temperature layer 1 [k ];latitudinal component of gravity wave stress [n m**-2 s];surface latent heat flux [w m**-2 s];meridional component of gravity wave stress [n m**-2 s]; land-sea mask [0(sea)-1(land)]; low cloud cover [(0 - 1)];medium cloud cover [(0 - 1)];runoff [m];sea-ice cover [(0-1) ];surface sensible heat flux [w m**-2 s];mean sea level pressure [pa];snow depth [m];snowfall (convective + stratiform) [m];soil temperature level 1 [k];surface net solar radiation, clear sky [w m**-2];surface solar radiation [w m**-2 s];surface solar radiation downwards [w m**-2 s];stratiform precipitation (large-scale precip)[m];east-west surface stress [n m**-2 s];north-south surface stress [n m**-2 s];2 metre temperature [k];surface net thermal radiation, clear sky [w m**-2];surface thermal radiation [w m**-2 s];surface thermal radiation downwards [w m**-2 s];top net solar radiation, clear sky [w m**-2];top solar radiation [w m**-2 s];top net thermal radiation, clear sky [w m**-2];top thermal radiation [w m**-2 s];total column ozone [kg m**-2];total column water [kg m**-2];total column water vapour [kg m**-2];total cloud cover [(0 - 1)];10 metre u wind component [m s**-1];volumetric soil water layer 1 [m**3 m**-3];10 metre v wind component [m s**-1];mean wave direction [degrees];significant wave height [m];mean wave period [s]