Update #3: The discontinuation applies exclusively to Metop-B GOME-2 product files, which are identified by "m01" in their filenames. Metop-C GOME-2 product files, which contain "m03" in the filename, will remain in production and are not impacted by this change.

Update #2: This serves as the two week reminder notification regarding the retirement of the Version 8 Total Ozone Retrieval Algorithm, scheduled for June 15, 2026.

Update #1: This serves as the 30-day notification regarding the retirement of the Version 8 Total Ozone Retrieval Algorithm, scheduled for June 15, 2026.Please be advised that the 30-day public comment window concludes today.

Topic: Retirement of Version 8 Total Ozone Retrieval Algorithm

Date/Time Issued: June 2, 2026 1545 UTC 

Product(s) or Data Impacted: 

CMC_GOME_Daily_bufr 

EMC_GOME-TO-L2_BUFR  

IND_NCMRWF__GOME_TO_L2_bufr  

NOAA_STAR_Polar_GOME_TO_Granules WCOSS_GOME_TO_L2_BUFR       CLASS_LEGACY_SRN_GOME-TO-L2_NC  

CLASS_LEGACY_SRN_GOME-TO-L3_ASCII  

CLASS_LEGACY_SRN_GOME-TO-L3_NC  

CLASS_LEGACY_SRN_GOME-TO-MGII_TXT  

CLASS_LEGACY_SRN_GOME_TO_Granules  

CLOUD_INGEST_GOME_TO_Granules 

Products Short Names and File Names are as under:

GOME-TO-L2_NC    V8TOZ-EDR_v1r1_m01_s202604141017560_e202604141020560_c202604141050440.nc

GOME-TO-L3_ASCII

GOME2-V8TO3_v1r0_m01_s202604070000000_e202604072359599_c202604081401479.ASC

GOME-TO-L3_GRB

GOME2-V8TO3_v1r0_m01_s202604130000000_e202604132359599_c202604141402100.grib2 

GOME-TO-L3_NC

GOME2-V8TO3_v1r0_m01_s202604130000000_e202604132359599_c202604141401580.nc

GOME-TO-L2_BUFR 

V8TOZ-EDR_v1r1_m01_s202604140053560_e202604140056560_c202604140127330.bufr

GOME-TO-MGII_TXT 

GOME-MGII-Final_v1r1_m01_s202604141159560_e202604141202560_c202604141232370.txt 

Date/Time of Initial Impact: June 15, 2026 0000 UTC

Date/Time of Expected End: NA (Termination of Product)

Length of Impact: NA

Details/Specifics of Change:

Due to the natural degradation of the GOME-2 instrument's optical components on MetOp-B, the signal intensity (throughput) has significantly decreased. This aging process has led to increased noise and reduced accuracy in spectral measurements, negatively impacting the quality of derived products, such as the Aerosol Index.

As a result of this degradation, Office of Satellite and Product Operations (OSPO) intends to retire the GOME2 MetOp-B products on June 15, 2026.

Web Site(s) for applicable information: 

Contact Information for Further Information: Please email User Services at spsd.userservices@noaa.gov or Product Area Lead at vaishali.kapoor@noaa.gov 

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