At this site, updates will be provided about the GCIP/GAPP SRB product.


The GCIP/GAPP SRB product, as available since January 1, 1996, is provided at the University of Maryland Web site: http://atmos.umd.edu/~srb/gcip/

03/15/2001 Initially, it was produced at NOAA/NESDIS as a real time, experimental product.

Starting July 2000, the product became "operational" at NOAA/NESDIS. From that time, two products are run at NOAA/NESDIS in parallel:

a. operational, and
b. experimental
04/01/2001 Till April 1, 2001, both products were the same. Presently, the experimental product is being used for testing modifications and improvements.
04/01/2001 To ensure that the users are receiving a consistent product, starting April 1, 2001, the University of Maryland Archive (http://atmos.umd.edu/~srb/gcip/) is providing SRB information as produced with the operational version.
04/01/2001 The University of Maryland is archiving both products (operational and experimental), for evaluation purposes.
06/07/2001 Starting from Jun 7, 2001, results from evaluation of Photosynthetically Active Radiation (PAR) against the SURFRAD observations have been added.
06/10/2001 Work is in progress to provide real time validation of the surface temperature SRB product.
06/20/2001 The NOAA/NESDIS operational system (OPS) has been upgraded as of 13Z on 20 June 2001. The upgrade includes an expanded domain (24-54 N, 126-66 W) from (25-50 N, 125-70 W) and calibration updates as described at:
07/10/2001 On July 1-2, 2001, the NOAA server that holds the operational SRB product, was down and data were lost. These two day's data were replaced with experimental run.
03/17/2003 During the 2002 - 2003 period, several problems related to snow information transfer to the NOAA/NESDIS GCIP SRB operational model were encountered. Initially, the snow field as it existed in February 2002, was not updated till the middle of August 2002. Subsequently, the transfer of information on snow to the radiation model encountered technical problems. Therefore, the satellite based estimates of surface radiative fluxes in snow covered areas will be in error. This snow problem at NOAA was fixed on March 17, 2003 at 18:15 Z.
04/01/2003 On April 1, 2003, GOES-8 was replaced by GOES-12. As yet, the system has not been fully debugged and starting April 1, 2003, the GCIP SRB data have problems. The users will be updated when the problem is resolved. Warning removed on 09/01/2003.

Snow unit problem in 1997

The inference scheme to derive surface radiative fluxes during snow season, requires information on snow extent in each grid box in %. On Julian day 104, 1997 at 18z, the snow were mistakenly changed to tenth of an inch. It was switched back to % on Julian day 262, 1997.

The following steps were taken at the University of Maryland:

  • replaced the snow data to the required unit
  • reprocessed the period from April to August of 1997
  • the radiative fluxes as derived with the wrong unit were replaced with the correct ones at this web site

Starting September 1, 2003, the transfer of processing to GOES-12 images has been made, and the earlier warning during the transition period is now removed.


Daily average shortwave downward flux for previous day and a one week animation of daily values have been added.


Recently, we have switched from a Unix to Linux operating system. This caused delay in activating the new FTP site data delivery. To minimize inconvenience to users, temporary access to data was provided via an HTTP site. This required manual download. We are pleased to let you know that the data can again be downloaded via an anonymous FTP site ftp://metosrv6.umd.edu/pub/srb/gcip/ . Please use "anonymous" as your username and your email address as your password when "ftp metosrv6.umd.edu" . After logging in, you can change directory to "/pub/srb/gcip/" to download data.

Due to space limitations on our FTP site, only the deg_1/2 reprocessed data have been placed there.

The deg_1/8 reprocessed data are not on the FTP site, yet they can be obtained from the HTTP website using Mozilla browser.

12/19/2007 Due to maneuver of GOES-12 there was a disruption in the operation of the satellite from 12/04/2007 to 12/17/2007. During this period observations from GOES 10 replaced the missing data from GOES-12. As a results, there was a gap in data over the southwest of US continent. Warning removed on 12/19/2007.
12/23/2008 Warning:

In recent days GOES-12 developed problems due to thruster failure. This is affecting the quality of the SRB product. A notice will be posted when this problem is resolved. Warning removed on 1/26/2009.

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