| Surface air temperature |
0.9 x 0.9 degrees lat-lon grid |
Optimum interpolation |
Global GEM model forecast |
6 hours |
Surface synoptic and aviation weather reports, Ships, Buoys,
Drifters |
| variable- resolution grid of GEM regional |
Regional GEM model forecast |
24 hours (1800 UTC) |
| Surface dew point depresssion |
0.9 x 0.9 degrees lat-lon grid |
Optimum interpolation |
Global GEM model forecast |
6 hours |
Surface synoptic and aviation weather reports, Ships, Buoys, Drifters |
| variable- resolution grid of GEM regional |
Regional GEM model forecast |
24 hours |
| Mean sea-level pressure |
0.9 x 0.9 degrees lat-lon grid |
Optimum interpolation (based on surface pressure and wind reports) |
Global GEM model forecast |
6 hours |
Surface synoptic and aviation weather reports, Ships, Buoys, Drifters |
| Sea surface temperature anomaly (Reference) |
0.9 x 0.9 degrees lat-lon grid |
Optimum interpolation |
Previous analysis |
24 hours |
Ships,buoys, drifters, AVHRR satellite data |
| Snow depth (Reference) |
0.33 x 0.33 degrees lat-lon grid |
Optimum interpolation |
Previous analysis modified by a 6-h glb frcst of snowfall and a snow melt algorithm |
6 hours |
Surface synoptic and aviation weather reports |
| Ice cover (Reference) |
0.33 x 0.33 degrees lat-lon grid |
Data averaging with a return to climatology in areas where data are not available. |
24 hours |
SSM/I, Ice Centre Data |
| Deep soil temperature |
0.9 x 0.9 degrees lat-lon grid |
Derived from climatology and a running mean of the surface air temperature analysis |
6 hours |
No measurements available |
| Albedo |
0.9 x 0.9 degrees lat-lon grid |
Derived from albedo climatology, vegetation type,
the snow depth analysis and the ice cover analysis |
6 hours |
No measurements available |
| Soil moisture |
variable- resolution grid of GEM regional |
Statistical technique based on the surface
temperature and the 6-h forecast errors of the dew point. |
24 hours (1800 UTC) |
No measurements available |
