NOAA ESRL PSD rean20thcent V2 six-hourly monolevel eatm

Resolution: 2x2; Longitude: global; Latitude: global; Time: [0000 1 Jan 1871,1800 31 Dec 2008]

• 6-hourly Cloud Water for entire atmosphere (kg/m^2) [ lon lat time ]
• 6-hourly Precipitable Water for entire atmosphere (kg/m^2) [ lon lat time ]
• 6-hourly Total Columnar Ozone (Dobsons) [ lon lat time ]