osi_saf_grib

Atlantic Downward Longwave Irradiance (O&SI SAF Courtesy)

The DLI is the longwave irradiance reaching the Earth surface in the 4-100 mm band, the irradiance being the radiant flux received per unit area. This defines an instantaneous DLI value, which corresponds to the definition of the hourly DLI. DLI values are expressed in tenth of in W/m2. The expected range is 100 to 500 W/m2 (whatever the temporal resolution), these minimum and maximum values being approximate. The 3-hourly and daily DLI values are mean values over the considered period of time, 3 or 24 hours. The LML DLI, 3-hourly products on LML area, derived from the geostationary satellite data (GOES and MSG), covering the oceanic area from 60 N to 60 S and from 100 W to 45 E, at 0.1 degree resolution. The MAP DLI, daily products on MAP area, derived from GOES, MSG and NOAA polar orbiter satellite data, covering the oceanic area from 90 N to 60 S and from 100 W to 45 E, at 0.1 degree resolution.

MAP DLI LW

MAP DLI SW

Atlantic Surface Solar Irradiance (O&SI SAF Courtesy)

The SSI is the solar irradiance reaching the Earth surface in the 0.3-4 µm band, the irradiance being the radiant flux received per unit area. This defines an instantaneous SSI value, which corresponds to the definition of the hourly SSI. The MAP SSI, daily products on MAP area, derived from GOES, MSG and NOAA polar orbiter satellite data, covering the oceanic area from 90 N to 60 S and from 100 W to 45 E, at 0.1 degree resolution. SSI values are expressed in tenths of in W/m2. At each satellite pass (NOAA and further METOP) received at Met.no, data are processed to produce HL SSI fields. The daily LML and the daily HL, derived from NOAA and produced by Met.no and DMI, are merged into the MAP product. In overlapping areas, two satellite values are available and the merging process is a choice between them. The method is based on a physical parameterization of the SSI as a function of the Top of Atmosphere (TOA) albedo, which is derived from the satellite visible image (one channel for GOES, two channels for NOAA or MSG).

MAP SSI LW

MAP SSI SW

Atlantic Sea Surface Temperature (O&SI SAF Courtesy)

Subskin SST: Comparable to in situ (buoy) measurements at night. Relation to bulk SST: equivalent to bulk SST by night. By day, a bias of several Kelvin may be found under favorable diurnal heating conditions. Relation to skin SST: by day and by night the subskin SST is convertible to skin temperature by subtracting 0. 2K. No lower limit is imposed on the SST calculations, providing the sea is ice free. The expected range is thus about -3°C till 35°C. The LML SST, 3-hourly means centered on 0100, 0400, 0700,...h UTC, derived from the geostationary satellite data (GOES and MSG), covering the oceanic area from 60 N to 60 S and from 100 W to 45 E , at 0.1 degree resolution, The MAP SST, 12-hourly means centered on 0000 and 1200 h UTC, derived from GOES, MSG and NOAA polar orbiter satellite data, covering the oceanic area from 90 N to 60 S and from 100 W to 45 E, at 0.1 degree resolution.

MAP SST

	O&SI SAF (David Taylor© GribViewer)

		Atlantic Downward Longwave Irradiance (O&SI SAF Courtesy)
		The DLI is the longwave irradiance reaching the Earth surface in the 4-100 mm band, the irradiance being the radiant flux received per unit area. This defines an instantaneous DLI value, which corresponds to the definition of the hourly DLI. DLI values are expressed in tenth of in W/m2. The expected range is 100 to 500 W/m2 (whatever the temporal resolution), these minimum and maximum values being approximate. The 3-hourly and daily DLI values are mean values over the considered period of time, 3 or 24 hours. The LML DLI, 3-hourly products on LML area, derived from the geostationary satellite data (GOES and MSG), covering the oceanic area from 60 N to 60 S and from 100 W to 45 E, at 0.1 degree resolution. The MAP DLI, daily products on MAP area, derived from GOES, MSG and NOAA polar orbiter satellite data, covering the oceanic area from 90 N to 60 S and from 100 W to 45 E, at 0.1 degree resolution.
MAP DLI LW			MAP DLI SW

		Atlantic Surface Solar Irradiance (O&SI SAF Courtesy)
		The SSI is the solar irradiance reaching the Earth surface in the 0.3-4 µm band, the irradiance being the radiant flux received per unit area. This defines an instantaneous SSI value, which corresponds to the definition of the hourly SSI. The MAP SSI, daily products on MAP area, derived from GOES, MSG and NOAA polar orbiter satellite data, covering the oceanic area from 90 N to 60 S and from 100 W to 45 E, at 0.1 degree resolution. SSI values are expressed in tenths of in W/m2. At each satellite pass (NOAA and further METOP) received at Met.no, data are processed to produce HL SSI fields. The daily LML and the daily HL, derived from NOAA and produced by Met.no and DMI, are merged into the MAP product. In overlapping areas, two satellite values are available and the merging process is a choice between them. The method is based on a physical parameterization of the SSI as a function of the Top of Atmosphere (TOA) albedo, which is derived from the satellite visible image (one channel for GOES, two channels for NOAA or MSG).
MAP SSI LW			MAP SSI SW

		Atlantic Sea Surface Temperature (O&SI SAF Courtesy)
		Subskin SST: Comparable to in situ (buoy) measurements at night. Relation to bulk SST: equivalent to bulk SST by night. By day, a bias of several Kelvin may be found under favorable diurnal heating conditions. Relation to skin SST: by day and by night the subskin SST is convertible to skin temperature by subtracting 0. 2K. No lower limit is imposed on the SST calculations, providing the sea is ice free. The expected range is thus about -3°C till 35°C. The LML SST, 3-hourly means centered on 0100, 0400, 0700,...h UTC, derived from the geostationary satellite data (GOES and MSG), covering the oceanic area from 60 N to 60 S and from 100 W to 45 E , at 0.1 degree resolution, The MAP SST, 12-hourly means centered on 0000 and 1200 h UTC, derived from GOES, MSG and NOAA polar orbiter satellite data, covering the oceanic area from 90 N to 60 S and from 100 W to 45 E, at 0.1 degree resolution.
MAP SST