{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T16:46:03Z","timestamp":1785257163129,"version":"3.55.0"},"reference-count":47,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2021,12,24]],"date-time":"2021-12-24T00:00:00Z","timestamp":1640304000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000006","name":"Office of Naval Research","doi-asserted-by":"publisher","award":["N00014\u201320\u20131\u20132680"],"award-info":[{"award-number":["N00014\u201320\u20131\u20132680"]}],"id":[{"id":"10.13039\/100000006","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Salinity is the primary determinant of the Arctic Ocean\u2019s density structure. Freshwater accumulation and distribution in the Arctic Ocean have varied significantly in recent decades and certainly in the Beaufort Gyre (BG). In this study, we analyze salinity variations in the BG region between 2012 and 2017. We use in situ salinity observations from the Seasonal Ice Zone Reconnaissance Surveys (SIZRS), CTD casts from the Beaufort Gyre Exploration Project (BGP), and the EN4 data to validate and compare with satellite observations from Soil Moisture Active Passive (SMAP), Soil Moisture and Ocean Salinity (SMOS), and Aquarius Optimally Interpolated Sea Surface Salinity (OISSS), and Arctic Ocean models: ECCO, MIZMAS, HYCOM, ORAS5, and GLORYS12. Overall, satellite observations are restricted to ice-free regions in the BG area, and models tend to overestimate sea surface salinity (SSS). Freshwater Content (FWC), an important component of the BG, is computed for EN4 and most models. ORAS5 provides the strongest positive SSS correlation coefficient (0.612) and lowest bias to in situ observations compared to the other products. ORAS5 subsurface salinity and FWC compare well with the EN4 data. Discrepancies between models and SIZRS data are highest in GLORYS12 and ECCO. These comparisons identify dissimilarities between salinity products and extend challenges to observations applicable to other areas of the Arctic Ocean.<\/jats:p>","DOI":"10.3390\/rs14010071","type":"journal-article","created":{"date-parts":[[2021,12,27]],"date-time":"2021-12-27T01:06:54Z","timestamp":1640567214000},"page":"71","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Intercomparison of Salinity Products in the Beaufort Gyre and Arctic Ocean"],"prefix":"10.3390","volume":"14","author":[{"given":"Sarah B.","family":"Hall","sequence":"first","affiliation":[{"name":"School of the Earth, Ocean and Environment, University of South Carolina, Columbia, SC 29208, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3465-8065","authenticated-orcid":false,"given":"Bulusu","family":"Subrahmanyam","sequence":"additional","affiliation":[{"name":"School of the Earth, Ocean and Environment, University of South Carolina, Columbia, SC 29208, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James H.","family":"Morison","sequence":"additional","affiliation":[{"name":"Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, WA 98105, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"e2020JC016110","DOI":"10.1029\/2020JC016110","article-title":"Sea Surface Salinity as a Proxy for Arctic Ocean Freshwater Changes","volume":"125","author":"Fournier","year":"2020","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1271","DOI":"10.1002\/2013JC008999","article-title":"Deterioration of perennial sea ice in the Beaufort Gyre from 2003 to 2012 and its impact on the oceanic freshwater cycle","volume":"119","author":"Krishfield","year":"2014","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"12493","DOI":"10.1029\/97JC00738","article-title":"Two circulation regimes of the wind-driven Arctic Ocean","volume":"102","author":"Proshutinsky","year":"1997","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"C00A10","DOI":"10.1029\/2008JC005104","article-title":"Beaufort Gyre freshwater reservoir: State and variability from observations","volume":"114","author":"Proshutinsky","year":"2009","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1053","DOI":"10.1175\/JPO-D-20-0190.1","article-title":"The Cyclonic Mode of Arctic Ocean Circulation","volume":"51","author":"Morison","year":"2021","journal-title":"J. Phys. Oceanogr."},{"key":"ref_6","first-page":"66","article-title":"Changing Arctic Ocean freshwater pathways","volume":"481","author":"Morison","year":"2012","journal-title":"Nat. Cell Biol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1016\/j.gloplacha.2014.11.013","article-title":"Arctic freshwater export: Status, mechanisms, and prospects","volume":"125","author":"Haine","year":"2015","journal-title":"Glob. Planet. Chang."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"4699","DOI":"10.1002\/jgrc.20341","article-title":"Hydrographic changes in the Lincoln Sea in the Arctic Ocean with focus on an upper ocean freshwater anomaly between 2007 and 2010","volume":"118","author":"Steele","year":"2013","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"14485","DOI":"10.1029\/JC094iC10p14485","article-title":"The role of sea ice and other fresh water in the Arctic circulation","volume":"94","author":"Aagaard","year":"1989","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Carmack, E., McLaughlin, F., Yamamoto-Kawai, M., Itoh, M., Shimada, K., Krishfield, R., and Proshutinsky, A. (2008). Freshwater Storage in the Northern Ocean and the Special Role of the Beaufort Gyre, Springer.","DOI":"10.1007\/978-1-4020-6774-7_8"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1765","DOI":"10.1007\/s00382-019-04735-y","article-title":"Sensitivity of the Arctic freshwater content and transport to model resolution","volume":"53","author":"Koenigk","year":"2019","journal-title":"Clim. Dyn."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1125","DOI":"10.1175\/JPO-D-16-0158.1","article-title":"An Edge-Referenced Surface Fresh Layer in the Beaufort Sea Seasonal Ice Zone","volume":"47","author":"Dewey","year":"2017","journal-title":"J. Phys. Oceanogr."},{"key":"ref_13","unstructured":"Meissner, T., Wentz, F.J., Manaster, A., and Lindsley, R. (2021, April 03). Remote Sensing Systems SMAP Ocean Surface Salinities Level 3 Running 8-Day, Version 4.0 Validated Release. Remote Sensing Systems. Santa Rosa, CA, USA. Available online: www.remss.com\/missions\/smap\/salinity\/."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Meissner, T., Wentz, F.J., and Le Vine, D.M. (2018). The Salinity Retrieval Algorithms for the NASA Aquarius Version 5 and SMAP Version 3 Releases. Remote Sens., 10.","DOI":"10.3390\/rs10071121"},{"key":"ref_15","unstructured":"Melnichenko, O., Hacker, P., Potemra, J., Meissner, T., and Wentz, F. (2021, September 10). Aquarius\/SMAP Sea Surface Salinity Optimum Interpolation Analysis. IPRC Technical Note No. 7, Available online: https:\/\/podaac-tools.jpl.nasa.gov\/drive\/files\/allData\/smap\/docs\/OISSS_V1\/L4OISSS_MultimissionProductGuide_V1.pdf."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1583","DOI":"10.1175\/JTECH-D-13-00241.1","article-title":"Spatial Optimal Interpolation of Aquarius Sea Surface Salinity: Algorithms and Implementation in the North Atlantic*","volume":"31","author":"Melnichenko","year":"2014","journal-title":"J. Atmospheric Ocean. Technol."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"602","DOI":"10.1002\/2015JC011343","article-title":"Optimum interpolation analysis of A quarius sea surface salinity","volume":"121","author":"Melnichenko","year":"2016","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"6704","DOI":"10.1002\/2013JC009067","article-title":"EN4: Quality controlled ocean temperature and salinity profiles and monthly objective analyses with uncertainty estimates","volume":"118","author":"Good","year":"2013","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_19","unstructured":"Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., and Ponte, R.M. (2021, February 22). Synopsis of the ECCO Central Production Global Ocean and Sea-Ice State Estimate, Version 4 Release 4 (Version 4 Release 4). Zenodo. Available online: https:\/\/zenodo.org\/record\/4533349#.YcUpvlkRVPY."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"3071","DOI":"10.5194\/gmd-8-3071-2015","article-title":"ECCO version 4: An integrated framework for non-linear inverse modeling and global ocean state estimation","volume":"8","author":"Forget","year":"2015","journal-title":"Geosci. Model Dev."},{"key":"ref_21","unstructured":"ECCO Consortium, Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., and Ponte, R.M. (2021, February 22). ECCO Central Estimate (Version 4 Release 4), Available online: https:\/\/ecco.jpl.nasa.gov\/drive\/."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"681","DOI":"10.1175\/1520-0493(2003)131<0845:MGSIWA>2.0.CO;2","article-title":"Modeling Global Sea Ice with a Thickness and Enthalpy Distribution Model in General-ized Curvilinear Coordinates","volume":"131","author":"Zhang","year":"2003","journal-title":"Mon. Weather Rev."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Zhang, J., Schweiger, A., and Steele, M. (2013). MIZMAS: Modeling the Evolution of Ice Thickness and Floe Size Distributions in the Marginal Ice Zone of the Chukchi and Beaufort Seas, Distribution Statement A.","DOI":"10.21236\/ADA601248"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"437","DOI":"10.1175\/1520-0477(1996)077<0437:TNYRP>2.0.CO;2","article-title":"The NCEP\/NCAR 40-Year Reanalysis Project","volume":"77","author":"Kalnay","year":"1996","journal-title":"Bull. Am. Meteorol. Soc."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"7933","DOI":"10.1002\/2016JC012196","article-title":"The Beaufort Gyre intensification and stabilization: A model-observation synthesis","volume":"121","author":"Zhang","year":"2016","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_26","unstructured":"Hunke, E.C., and Lipscomb, W. (2008). CICE: The Los Alamos Sea Ice Model, Documentation and Software User\u2019s Manual, Version 4.0."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"64","DOI":"10.5670\/oceanog.2009.39","article-title":"US GODAE: Global Ocean Prediction with the HYbrid Coordinate Ocean Model (HYCOM)","volume":"22","author":"Chassignet","year":"2009","journal-title":"Oceanography"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"779","DOI":"10.5194\/os-15-779-2019","article-title":"The ECMWF operational ensemble reanalysis\u2013analysis system for ocean and sea ice: A description of the system and assessment","volume":"15","author":"Zuo","year":"2019","journal-title":"Ocean Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"553","DOI":"10.1002\/qj.828","article-title":"The ERA-Interim reanalysis: Configuration and performance of the data assimilation system","volume":"137","author":"Dee","year":"2011","journal-title":"Q. J. R. Meteorol. Soc."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"2973","DOI":"10.1002\/2014JC010565","article-title":"Surface wave effects in the NEMO ocean model: Forced and coupled experiments","volume":"120","author":"Breivik","year":"2015","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"341","DOI":"10.1007\/s00382-008-0441-3","article-title":"The global climatology of an interannually varying air\u2013sea flux data set","volume":"33","author":"Large","year":"2009","journal-title":"Clim. Dyn."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Verezemskaya, P., Barnier, B., Gulev, S.K., Gladyshev, S., Molines, J., Gladyshev, V., Lellouche, J., and Gavrikov, A. (2021). Assessing Eddying (1\/12\u00b0) Ocean Reanalysis GLORYS12 Using the 14-yr Instrumental Record From 59.5\u00b0N Section in the Atlantic. J. Geophys. Res. Oceans, 126.","DOI":"10.1029\/2020JC016317"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"341","DOI":"10.1038\/ngeo467","article-title":"September sea-ice cover in the Arctic Ocean projected to vanish by 2100","volume":"2","author":"Hall","year":"2009","journal-title":"Nat. Geosci."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"9658","DOI":"10.1029\/2019JC015281","article-title":"Analysis of the Beaufort Gyre Freshwater Content in 2003\u20132018","volume":"124","author":"Proshutinsky","year":"2019","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1191","DOI":"10.5194\/os-15-1191-2019","article-title":"Evaluation of Arctic Ocean surface salinities from the Soil Moisture and Ocean Salinity (SMOS) mission against a regional reanalysis and in situ data","volume":"15","author":"Xie","year":"2019","journal-title":"Ocean Sci."},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Fournier, S., Lee, T., Tang, W., Steele, M., and Olmedo, E. (2019). Evaluation and Intercomparison of SMOS, Aquarius, and SMAP Sea Surface Salinity Products in the Arctic Ocean. Remote Sens., 11.","DOI":"10.3390\/rs11243043"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1932","DOI":"10.1029\/2019JC014937","article-title":"Comparison of Satellite-Derived Sea Surface Salinity Products from SMOS, Aquarius, and SMAP","volume":"124","author":"Bao","year":"2019","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Bingham, F., Brodnitz, S., and Yu, L. (2020). Sea Surface Salinity Seasonal Variability in the Tropics from Satellites, Gridded In Situ Products and Mooring Observations. Remote Sens., 13.","DOI":"10.1002\/essoar.10505049.2"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"2277","DOI":"10.1175\/JCLI-D-18-0605.1","article-title":"Temperature and Salinity Variability in the SODA3, ECCO4r3, and ORAS5 Ocean Reanalyses, 1993\u20132015","volume":"32","author":"Carton","year":"2019","journal-title":"J. Clim."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"1729","DOI":"10.1175\/2010JPO4323.1","article-title":"Sea Ice Response to Atmospheric and Oceanic Forcing in the Bering Sea","volume":"40","author":"Zhang","year":"2010","journal-title":"J. Phys. Oceanogr."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"19","DOI":"10.1016\/j.pocean.2014.12.005","article-title":"Seasonal and interannual variability of pan-Arctic surface mixed layer properties from 1979 to 2012 from hydrographic data, and the dominance of stratification for multiyear mixed layer depth shoaling","volume":"134","author":"Woodgate","year":"2015","journal-title":"Prog. Oceanogr."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"4618","DOI":"10.1029\/2019JC014940","article-title":"Deepening of the Winter Mixed Layer in the Canada Basin, Arctic Ocean Over 2006\u20132017","volume":"124","author":"Cole","year":"2019","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"L03603","DOI":"10.1029\/2011GL050219","article-title":"Winter sea-ice melt in the Canada Basin, Arctic Ocean","volume":"39","author":"Jackson","year":"2012","journal-title":"Geophys. Res. Lett."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"C11010","DOI":"10.1029\/2005JC003424","article-title":"The large-scale freshwater cycle of the Arctic","volume":"111","author":"Serreze","year":"2006","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1175\/JCLI-D-18-0237.1","article-title":"Recent Sea Ice Decline Did Not Signif-icantly Increase the Total Liquid Freshwater Content of the Arctic Ocean","volume":"32","author":"Wang","year":"2019","journal-title":"J. Clim."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"961","DOI":"10.1002\/2013GL058121","article-title":"Arctic Ocean basin liquid freshwater storage trend 1992\u20132012","volume":"41","author":"Rabe","year":"2014","journal-title":"Geophys. Res. Lett."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"1081","DOI":"10.5194\/os-17-1081-2021","article-title":"Freshwater in the Arctic Ocean 2010\u20132019","volume":"17","author":"Solomon","year":"2021","journal-title":"Ocean Sci. 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