Level 2B, 2C

 GRM-02/41 NRT T  GRM-03/42 NRT Q  GRM-04/43 NRT P  GRM-05/44 NRT SP
 GRM-10/48 Offline T  GRM-11/49 Offline Q  GRM-12/50 Offline P  GRM-13/51 Offline SP

GRM-05/44: NRT Surface Pressure
(NSPMEA/NSPMEB)

_Values Remarks
UnitshectoPascals (hPa) _
DomainSurfaceStraight line tangent point horizontal location
Range300-1100 hPa_
Requirement
on target
accuracy
2 hPa_
Requirement
on vertical
resolution
N/A_
GRM-05 status Operational Metop-A
GRM-44 status Operational Metop-B
Current product version (GRM-05): 1.0
Current product version (GRM-44): 1.0
_

Product description

The NRT surface pressure product contains the pressure at the Earth's surface below the RO profile. The horizontal location is nominally at the tangent point location of the straight line connecting the GPS and Metop satellites.

Algorithm description

Each product profile is the result of one radio occultation. Signals from the occulting GPS satellite are measured by the GRAS receiver onboard the EPS/Metop satellite, downlinked, and processed by the ROM SAF into refractivity. More details can be found in the Algorithm Theoretical Baseline Document, on the Radio Occultation Theory page, and in the Validation Report for GRM-05 and GRM-44.

Data characteristics

GRAS measures about 700 GPS occultations per day. The product is output in both NetCDF and BUFR format, and disseminated via GTS/RMDCN (BUFR) and EUMETCast (NetCDF and BUFR). NetCDF files are also stored in the ROM SAF Product Archive.

Product validation and monitoring

Accuracy of the current version of the product will be described in a future Validation Report. Daily monitoring of the processing and dissemination can be seen on the Monitoring Page.

Product documentation

All ROM SAF NRT and Offline products are described in the Product User Manual.
This product will be made available at the Product Archive.

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