Update #2:M-B On Jan 17, 2020 at 22:11Z a fix was implemented to a general science module/library that impacted processing of NOAA-20 and S-NPP VIIRS SDR reflective solar bands (RSB), OMPS SDR and EDRs and CrIS SWIR band at day time.M-B All products except OMPS are back to meeting specification as of this update.M-B Investigation into OMPS failures, primarily on the NDE product generation system are still being investigated.M-B Another update will follow when OMPS products are returned back to nominal.
Update #1: A fix has been identified and is in the process of being deployed within the next several hours.M-B Users should expect varying levels of degradation in both the SDR and EDR products until the fix is fully implemented.M-B Please see updated information below.
Topic: VIIRS SDR reflective solar bands (RSB), OMPS SDR and EDRs and CrIS SWIR band at day time
Date/Time Issued:M-B January 17, 2020 2337Z
Product(s) or Data Impacted: VIIRS SDR reflectance/radiance products and L2+ products using RSB bands, OMPS SDR and EDRs, CrIS SWIR band at day time and L2+productsM-B
Date/Time of Initial Impact: January 16, 2020 0000Z
Date/Time of Expected End: TBD (no later than January 18, 2020 0000Z)
Length of Event:M-B TBD
Details/Specifics of Change:M-B
There has been an anomaly in the VIIRS SDR reflective solar bands (RSB) calibration for both NOAA-20 and S-NPP due to an unexpected change in the solar vector since about 2020-01-16 0:00 UTC. As a result, large errors in VIIRS SDR reflectance/radiance products have been observed which affect RSB based products.M-BM-B
This anomaly appears to affect the OMPS SDR as well with large errors in the Solar Zenith Angles.M-B As a result almost all V8TOz and V8Pro EDRs have very large errors in derived ozone and other estimates (only 20% of these bad values are flagged). EDRs have also been impacted as of 2020-01-16 0:00Z. The IDPS Team is working on the problem but the OMPS Nadir EDR products should not be used until further notice.M-B
The impact to CrIS should be only limited to CrIS Short Wave Infrared band at day time.
ESPC Level 2 products using VIIRS RSB bands and OMPS level 2 products are degraded. NESDIS is diligently investigating and working towards a solution.M-B Further updates will be provided as conditions change.
Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov and 301-817-3880
Web Site(s) for applicable information: N/A
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