{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:19:05Z","timestamp":1760242745913,"version":"build-2065373602"},"reference-count":23,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2016,4,9]],"date-time":"2016-04-09T00:00:00Z","timestamp":1460160000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>In response to its users\u2019 needs, the National Oceanic and Atmospheric Administration (NOAA) initiated reanalysis (RAN) of the Advanced Very High Resolution Radiometer (AVHRR) Global Area Coverage (GAC; 4 km) sea surface temperature (SST) data employing its Advanced Clear Sky Processor for Oceans (ACSPO) retrieval system. Initially, AVHRR\/3 data from five NOAA and two Metop satellites from 2002 to 2015 have been reprocessed. The derived SSTs have been matched up with two reference SSTs\u2014the quality controlled in situ SSTs from the NOAA in situ Quality Monitor (iQuam) and the Canadian Meteorological Centre (CMC) L4 SST analysis\u2014and analyzed in the NOAA SST Quality Monitor (SQUAM) online system. The corresponding clear-sky ocean brightness temperatures (BT) in AVHRR bands 3b, 4 and 5 (centered at 3.7, 11, and 12 \u00b5m, respectively) have been compared with the Community Radiative Transfer Model simulations in another NOAA online system, Monitoring of Infrared Clear-sky Radiances over Ocean for SST (MICROS). For some AVHRRs, the time series of \u201cAVHRR minus reference\u201d SSTs and \u201cobserved minus model\u201d BTs are unstable and inconsistent, with artifacts in the SSTs and BTs strongly correlated. In the official \u201cReanalysis version 1\u201d (RAN1), data from only five platforms\u2014two midmorning (NOAA-17 and Metop-A) and three afternoon (NOAA-16, -18 and -19)\u2014were included during the most stable periods of their operations. The stability of the SST time series was further improved using variable regression SST coefficients, similarly to how it was done in the NOAA\/NASA Pathfinder version 5.2 (PFV5.2) dataset. For data assimilation applications, especially those blending satellite and in situ SSTs, we recommend bias-correcting the RAN1 SSTs using the newly developed sensor-specific error statistics (SSES), which are reported in the product files. Relative performance of RAN1 and PFV5.2 SSTs is discussed. Work is underway to improve the calibration of AVHRR\/3s and extend RAN time series, initially back to the mid-1990s and later to the early 1980s.<\/jats:p>","DOI":"10.3390\/rs8040315","type":"journal-article","created":{"date-parts":[[2016,4,11]],"date-time":"2016-04-11T12:07:36Z","timestamp":1460376456000},"page":"315","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["AVHRR GAC SST Reanalysis Version 1 (RAN1)"],"prefix":"10.3390","volume":"8","author":[{"given":"Alexander","family":"Ignatov","sequence":"first","affiliation":[{"name":"NOAA STAR, NCWCP, 5830 University Research Court, College Park, MD 20740, USA"}]},{"given":"Xinjia","family":"Zhou","sequence":"additional","affiliation":[{"name":"NOAA STAR, NCWCP, 5830 University Research Court, College Park, MD 20740, USA"},{"name":"Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523, USA"}]},{"given":"Boris","family":"Petrenko","sequence":"additional","affiliation":[{"name":"NOAA STAR, NCWCP, 5830 University Research Court, College Park, MD 20740, USA"},{"name":"Global Science and Technology, Inc., Greenbelt, MD 20770, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5641-0509","authenticated-orcid":false,"given":"Xingming","family":"Liang","sequence":"additional","affiliation":[{"name":"NOAA STAR, NCWCP, 5830 University Research Court, College Park, MD 20740, USA"},{"name":"Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523, USA"}]},{"given":"Yury","family":"Kihai","sequence":"additional","affiliation":[{"name":"NOAA STAR, NCWCP, 5830 University Research Court, College Park, MD 20740, USA"},{"name":"Global Science and Technology, Inc., Greenbelt, MD 20770, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8789-0506","authenticated-orcid":false,"given":"Prasanjit","family":"Dash","sequence":"additional","affiliation":[{"name":"NOAA STAR, NCWCP, 5830 University Research Court, College Park, MD 20740, USA"},{"name":"Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523, USA"}]},{"given":"John","family":"Stroup","sequence":"additional","affiliation":[{"name":"NOAA STAR, NCWCP, 5830 University Research Court, College Park, MD 20740, USA"},{"name":"Stinger Ghaffarian Technologies, Inc., Greenbelt, MD 20770, USA"}]},{"given":"John","family":"Sapper","sequence":"additional","affiliation":[{"name":"NOAA OSPO, College Park, MD 20740, USA"}]},{"given":"Paul","family":"DiGiacomo","sequence":"additional","affiliation":[{"name":"NOAA STAR, NCWCP, 5830 University Research Court, College Park, MD 20740, USA"}]}],"member":"1968","published-online":{"date-parts":[[2016,4,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1609","DOI":"10.1175\/2010JTECHA1413.1","article-title":"Clear-sky mask for the advanced clear-sky processor for oceans","volume":"27","author":"Petrenko","year":"2010","journal-title":"J. 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