{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,3]],"date-time":"2026-03-03T16:08:04Z","timestamp":1772554084854,"version":"3.50.1"},"reference-count":76,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2018,6,4]],"date-time":"2018-06-04T00:00:00Z","timestamp":1528070400000},"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>Sea surface salinity (SSS) links various components of the Arctic freshwater system. SSS responds to freshwater inputs from river discharge, sea ice change, precipitation and evaporation, and oceanic transport through the open straits of the Pacific and Atlantic oceans. However, in situ SSS data in the Arctic Ocean are very sparse and insufficient to depict the large-scale variability to address the critical question of how climate variability and change affect the Arctic Ocean freshwater. The L-band microwave radiometer on board the NASA Soil Moisture Active Passive (SMAP) mission has been providing SSS measurements since April 2015, at approximately 60 km resolution with Arctic Ocean coverage in 1\u20132 days. With improved land\/ice correction, the SMAP SSS algorithm that was developed at the Jet Propulsion Laboratory (JPL) is able to retrieve SSS in ice-free regions 35 km of the coast. SMAP observes a large-scale contrast in salinity between the Atlantic and Pacific sides of the Arctic Ocean, while retrievals within the Arctic Circle vary over time, depending on the sea ice coverage and river runoff. We assess the accuracy of SMAP SSS through comparative analysis with in situ salinity data collected by Argo floats, ships, gliders, and in field campaigns. Results derived from nearly 20,000 pairs of SMAP and in situ data North of 50\u00b0N collocated within a 12.5-km radius and daily time window indicate a Root Mean Square Difference (RMSD) less than ~1 psu with a correlation coefficient of 0.82 and a near unity regression slope over the entire range of salinity. In contrast, the Hybrid Coordinate Ocean Model (HYCOM) has a smaller RMSD with Argo. However, there are clear systematic biases in the HYCOM for salinity in the range of 25\u201330 psu, leading to a regression slope of about 0.5. In the region North of 65\u00b0N, the number of collocated samples drops more than 70%, resulting in an RMSD of about 1.2 psu. SMAP SSS in the Kara Sea shows a consistent response to discharge anomalies from the Ob\u2019 and Yenisei rivers between 2015 and 2016, providing an assessment of runoff impact in a region where no in situ salinity data are available for validation. The Kara Sea SSS anomaly observed by SMAP is missing in the HYCOM SSS, which assimilates climatological runoffs without interannual changes. We explored the feasibility of using SMAP SSS to monitor the sea surface salinity variability at the major Arctic Ocean gateways. Results show that although the SMAP SSS is limited to about 1 psu accuracy, many large salinity changes are observable. This may lead to the potential application of satellite SSS in the Arctic monitoring system as a proxy of the upper ocean layer freshwater exchanges with subarctic oceans.<\/jats:p>","DOI":"10.3390\/rs10060869","type":"journal-article","created":{"date-parts":[[2018,6,4]],"date-time":"2018-06-04T12:14:30Z","timestamp":1528114470000},"page":"869","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":71,"title":["The Potential and Challenges of Using Soil Moisture Active Passive (SMAP) Sea Surface Salinity to Monitor Arctic Ocean Freshwater Changes"],"prefix":"10.3390","volume":"10","author":[{"given":"Wenqing","family":"Tang","sequence":"first","affiliation":[{"name":"Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA"}]},{"given":"Simon","family":"Yueh","sequence":"additional","affiliation":[{"name":"Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA"}]},{"given":"Daqing","family":"Yang","sequence":"additional","affiliation":[{"name":"Environment and Climate Change Canada, Water and Climate Impacts Research Centre, Victoria, BC V8P 5C2, Canada"}]},{"given":"Alexander","family":"Fore","sequence":"additional","affiliation":[{"name":"Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA"}]},{"given":"Akiko","family":"Hayashi","sequence":"additional","affiliation":[{"name":"Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA"}]},{"given":"Tong","family":"Lee","sequence":"additional","affiliation":[{"name":"Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6420-9749","authenticated-orcid":false,"given":"Severine","family":"Fournier","sequence":"additional","affiliation":[{"name":"Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA"}]},{"given":"Benjamin","family":"Holt","sequence":"additional","affiliation":[{"name":"Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA"}]}],"member":"1968","published-online":{"date-parts":[[2018,6,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"C07005","DOI":"10.1029\/2009JC005312","article-title":"Thinning and volume loss of Arctic sea ice: 2003\u20132008","volume":"114","author":"Kwok","year":"2009","journal-title":"J. Geophys. Res."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1956","DOI":"10.1029\/2002GL015650","article-title":"A rapidly decline perennial sea ice cover in the Arctic","volume":"29","author":"Comiso","year":"2002","journal-title":"Geophys. Res. Lett."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"881","DOI":"10.5194\/tc-6-881-2012","article-title":"Arctic sea ice variability and trends. 1979\u20132010","volume":"6","author":"Cavalieri","year":"2012","journal-title":"Cryosphere"},{"key":"ref_4","first-page":"C00A10","article-title":"The Beaufort Gyre Fresh Water Reservior: State and variability from observations","volume":"114","author":"Proshutinsky","year":"2009","journal-title":"J. Geophys. Res."},{"key":"ref_5","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_6","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/j.dsr.2010.12.002","article-title":"An assessment of Arctic Ocean freshwater content changes from the 1990s to 2006\u20132008","volume":"58","author":"Rage","year":"2011","journal-title":"Deep Sea Res."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"C00A12","DOI":"10.1029\/2008JC005001","article-title":"Joint effects of boundary currents and thermo-haline intrusions on the warming of Atlantic water in the Canada Basin, 1993\u20132007","volume":"114","author":"McLaughlin","year":"2009","journal-title":"J. Geophys. Res."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"8362","DOI":"10.1175\/JCLI-D-12-00266.1","article-title":"Warming of the intermediate Atlantic Water of the Arctic Ocean in the 2000s","volume":"25","author":"Polyakov","year":"2012","journal-title":"J. Clim."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Rawlins, M.A., Steele, M., Holland, M., Adam, J., Cherry, J., Francis, J., Groisman, P., Hinzman, L., Huntington, T., and Kane, D. (2010). Analysis of the Arctic System for Freshwater Cycle Intensification: Observations and Expectations. J. Clim.","DOI":"10.1175\/2010JCLI3421.1"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"19","DOI":"10.5670\/oceanog.2016.95","article-title":"Introduction to the special issue on ocean-ice interaction","volume":"29","author":"Willis","year":"2016","journal-title":"Oceanography"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"72","DOI":"10.5670\/oceanog.2016.100","article-title":"Oceans Melting Greenland: Early results from NASA\u2019s ocean-ice mission in Greenland","volume":"29","author":"Fenty","year":"2016","journal-title":"Oceanography"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"2121","DOI":"10.1002\/2015JG003127","article-title":"Arctic Freshwater Synthesis: Introduction","volume":"120","author":"Prowse","year":"2015","journal-title":"J. Geophys. Res. Biogeosci."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1887","DOI":"10.1002\/2015JG003128","article-title":"Arctic Freshwater Synthesis: Summary of key emerging issues","volume":"120","author":"Prowse","year":"2015","journal-title":"J. Geophys. Res. Biogeosci."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Carmack, C.E., Yamamoto-Kawai, M., Haine, T.W.N., Bacon, S., Bluhm, B.A., Lique, C., Melling, H., Polyakov, I.V., Straneo, F., and Timmermans, M.-L. (2016). Freshwater and its role in the Arctic Marine System: Sources, disposition, storage, export, and physical and biogeochemical consequences in the Arctic and global oceans. J. Geophys. Res. Biogeosci., 121.","DOI":"10.1002\/2015JG003140"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"540","DOI":"10.1002\/2015JG003120","article-title":"Modeling the Arctic freshwater system and its integration in the global system: Lessons learned and future challenges","volume":"121","author":"Lique","year":"2016","journal-title":"J. Geophys. Res. Biogeosci."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Thomson, J., Ackley, S., Girard-Ardhuin, F., Ardhuin, F., Babanin, A., Boutin, G., Brozena, J., Cheng, S., Collins, C., and Doble, M. (2018). Overview of the Arctic Sea State and Boundary Layer Physics Program. J. Geophys. Res. Oceans.","DOI":"10.1002\/2018JC013766"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"20","DOI":"10.5670\/oceanog.2015.03","article-title":"Ocean salinity and the global water cycle","volume":"28","author":"Durack","year":"2015","journal-title":"Oceanography"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"455","DOI":"10.1126\/science.1212222","article-title":"Ocean Salinities Reveal Strong Global Water Cycle Intensification During 1950 to 2000","volume":"336","author":"Durack","year":"2012","journal-title":"Science"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"12","DOI":"10.5670\/oceanog.2008.63","article-title":"Salinity and the global water cycle","volume":"21","author":"Schmitt","year":"2008","journal-title":"Oceanography"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1395","DOI":"10.1029\/95RG00184","article-title":"The ocean component of the global water cycle: US National Report to International Union of Geodesy and Geophysics, 1991\u20131994","volume":"33","author":"Schmitt","year":"1995","journal-title":"Rev. Geophys."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1175\/1520-0485(1992)022<0155:TOFBTO>2.0.CO;2","article-title":"On the transport of fresh water by the oceans","volume":"22","author":"Wijffels","year":"1992","journal-title":"J. Phys. Oceanography"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"7523","DOI":"10.1002\/2014JC010273","article-title":"Mechanisms of Pacific Summer Water variability in the Arctic\u2019s Central Canada Basin","volume":"119","author":"Timmermans","year":"2014","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_23","first-page":"C00D03","article-title":"Surface freshening in the Arctic Ocean\u2019s Eurasian Basin: An apparent consequence of recent change in the wind-driven circulation","volume":"116","author":"Timmermans","year":"2011","journal-title":"J. Geophys. Res."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"124","DOI":"10.1016\/j.pocean.2017.12.007","article-title":"Increases in the Pacific inflow to the Arctic from 1990 to 2015, and insights into seasonal trends and driving mechanisms from year-round Bering Strait mooring data","volume":"160","author":"Woodgate","year":"2018","journal-title":"Prog. Oceanogr."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"22","DOI":"10.5670\/oceanog.2016.96","article-title":"Greenland melt and the Atlantic meridional overturning circulation","volume":"29","author":"Bamber","year":"2016","journal-title":"Oceanography"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"10525","DOI":"10.1038\/ncomms10525","article-title":"Recent increases in Arctic freshwater flux affects Labrador Sea convection and Atlantic overturning circulation","volume":"7","author":"Yang","year":"2016","journal-title":"Nat. Commun."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"299","DOI":"10.1007\/s00382-015-2540-2","article-title":"Global and European climate impacts of a slowdown of the AMOC in a high resolution GCM","volume":"45","author":"Jackson","year":"2015","journal-title":"Clim. Dyn."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"154","DOI":"10.5670\/oceanog.2016.107","article-title":"Contributions of Greenland and Antarctica to global and regional sea level change","volume":"29","author":"Leuliette","year":"2016","journal-title":"Oceanography"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"276","DOI":"10.1175\/JCLI-D-13-00762.1","article-title":"On the early response of the climate system to a meltwater input from Greenland","volume":"27","author":"Agarwal","year":"2014","journal-title":"J. Clim."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"666","DOI":"10.1109\/JPROC.2010.2043032","article-title":"The SMOS mission: New tool for monitoring key elements of the global water cycle","volume":"98","author":"Kerr","year":"2010","journal-title":"Proc. IEEE"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"649","DOI":"10.1109\/JPROC.2009.2033096","article-title":"SMOS: The challenging sea surface salinity measurement from space","volume":"98","author":"Font","year":"2010","journal-title":"Proc. IEEE"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2040","DOI":"10.1109\/TGRS.2007.898092","article-title":"Aquarius: An instrument to monitor sea surface salinity from space","volume":"45","author":"Lagerloef","year":"2007","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"68","DOI":"10.5670\/oceanog.2008.68","article-title":"The Aquarius\/Sac-D Mission: Designed to Meet the Salinity Remote-Sensing Challenge","volume":"21","author":"Lagerloef","year":"2008","journal-title":"Oceanography"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"4619","DOI":"10.1109\/TGRS.2013.2266915","article-title":"L-band Passive and Active Microwave Geophysical Model Functions of Ocean Surface Winds and Applications to Aquarius Retrieval","volume":"51","author":"Yueh","year":"2013","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"704","DOI":"10.1109\/JPROC.2010.2043918","article-title":"The Soil Moisture Active Passive (SMAP) Mission","volume":"98","author":"Entekhabi","year":"2010","journal-title":"Proc. IEEE"},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Fore, A., Yueh, S., Tang, W., Stiles, B., and Hayashi, A. (2016). Combined Active\/Passive Retrievals of Ocean Vector Wind and Sea Surface Salinity with SMAP. IEEE Trans. Geosci. Remote Sens., 54.","DOI":"10.1109\/IGARSS.2016.7729582"},{"key":"ref_37","unstructured":"(2018, May 05). Linkages of Salinity with Ocean Circulation, Water Cycle, and Climate Variability. Community White Paper in Response to Request for Information #1 by the US National Research Council Decadal Survey for Earth Science and Applications from Space 2017\u20132027. Available online: http:\/\/surveygizmoresponseuploads.s3.amazonaws.com\/fileuploads\/15647\/2289356\/66-d5c509554e258d30eb31a63804edbf70_LeeTong.docx."},{"key":"ref_38","unstructured":"(2018, May 05). Linkages of Salinity with Ocean Circulation, Water Cycle, and Climate Variability. Community White Paper in Response to Request for Information #2 by the US National Research Council Decadal Survey for Earth Science and Applications from Space 2017\u20132027. Available online: http:\/\/surveygizmoresponseuploads.s3.amazonaws.com\/fileuploads\/15647\/2604456\/107-1abc9aa1a37ab7e77d91d86598954a50_LeeTong.pdf."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"2","DOI":"10.1002\/2015RS005776","article-title":"Accurate measurements of the dielectric constant of seawater at L band","volume":"51","author":"Lang","year":"2016","journal-title":"Radio Sci."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"104","DOI":"10.1109\/TAP.1977.1141539","article-title":"An improved model for the dielectric constant of seawater at microwave frequencies","volume":"25","author":"Klein","year":"1977","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"1285","DOI":"10.1109\/TGRS.2016.2622011","article-title":"Improved sea ice fraction characterization for L-band observations by the aquarius radiometers","volume":"55","author":"Dinnat","year":"2017","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"905","DOI":"10.5194\/tc-8-905-2014","article-title":"Weekly gridded Aquarius L-band radiometer\/scatterometer observations and salinity retrievals over the polar regions\u2014Part 1: Product description","volume":"8","author":"Brucker","year":"2014","journal-title":"Cryosphere"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"915","DOI":"10.5194\/tc-8-915-2014","article-title":"Weekly gridded Aquarius L-band radiometer\/scatterometer observations and salinity retrievals over the polar regions\u2014Part 2: Initial product analysis","volume":"8","author":"Brucker","year":"2014","journal-title":"Cryosphere"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"458","DOI":"10.1016\/j.rse.2016.10.035","article-title":"Validation of satellite sea surface temperature analyses in the Beaufort Sea using UpTempO buoys","volume":"187","author":"Castro","year":"2016","journal-title":"Remote Sens. Environ."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"7717","DOI":"10.1002\/2017JC013184","article-title":"Satellite observed salinity distributions at high latitudes in the Northern Hemisphere: A comparison of four products","volume":"122","author":"Comiso","year":"2017","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"6171","DOI":"10.1002\/2014JC010101","article-title":"Validation of Aquarius sea surface salinity with in situ measurements from Argo floats and moored buoys","volume":"119","author":"Tang","year":"2014","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Tang, W., Fore, A., Yueh, S., Lee, T., Hayashi, A., Sanchez-Franks, A., Martinez, J., King, B., and Baranowski, D. (2017). Validating SMAP SSS with in situ measurements. Remote Sens. Environ., 326\u2013340.","DOI":"10.1016\/j.rse.2017.08.021"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"3857","DOI":"10.1002\/2016GL068822","article-title":"Consistency of Aquarius sea surface salinity with Argo products on various spatial and temporal scales","volume":"43","author":"Lee","year":"2016","journal-title":"Geophys. Res. Lett."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"1391","DOI":"10.1175\/BAMS-D-15-00032.1","article-title":"Satellite and in situ Salinity: Understanding Stratification and Sub-Footprint Variability","volume":"97","author":"Boutin","year":"2016","journal-title":"Bull. Am. Met. Soc."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"2689","DOI":"10.1175\/JTECH-D-13-00110.1","article-title":"Small-scale variability in sea surface salinity and implications for satellite-derived measurements","volume":"30","author":"Vinogradova","year":"2018","journal-title":"J. Atmos. Ocean. Technol."},{"key":"ref_51","unstructured":"JPL Climate Oceans and Solid Earth Group (2018). JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image Monthly or 8-Day Running Mean."},{"key":"ref_52","unstructured":"(2018, May 05). NCEP Sea Ice Concentration Analyses, Available online: http:\/\/polar.ncep.noaa.gov\/seaice\/Analyses.shtml."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"64","DOI":"10.5670\/oceanog.2009.39","article-title":"U.S. GODAE: Global Ocean Prediction with the HYbrid Coordinate Ocean Model (HYCOM)","volume":"22","author":"Chassignet","year":"2009","journal-title":"Oceanography"},{"key":"ref_54","doi-asserted-by":"crossref","unstructured":"Meissner, T., and Wentz, F.J. (2016). Remote Sensing Systems SMAP Ocean Surface Salinities [Level 2C, Level 3 Running 8-day, Level 3 Monthly], Remote Sensing Systems. Version 2.0 validated release.","DOI":"10.56236\/RSS-bd"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"46","DOI":"10.5670\/oceanog.2009.65","article-title":"Argo: The challenge of continuing 10 years of progress","volume":"22","author":"Roemmich","year":"2009","journal-title":"Oceanography"},{"key":"ref_56","unstructured":"Argo (2000). Argo float data and metadata from Global Data Assembly Centre (Argo GDAC). SEANOE."},{"key":"ref_57","unstructured":"European Union Copernicus Marine Environment Monitoring Service (CMEMS) (2018, April 09). The Arctic Ocean In-Situ Near-Real-Time Observations; Product Identifier INSITU_ARC_NRT_OBSERVATIONS_013_031. Available online: http:\/\/copernicus.eu\/ situ-thematic-centre-ins-tac\/."},{"key":"ref_58","unstructured":"OMG Mission (2016). Conductivity, Temperature and Depth (CTD) Data from the Ocean Survey, OMG SDS. Version 0.1."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"C08031","DOI":"10.1029\/2010JC006634","article-title":"The mixed layer salinity budget and sea ice in the Southern Ocean","volume":"116","author":"Ren","year":"2011","journal-title":"J. Geophys. Res."},{"key":"ref_60","unstructured":"Cavalieri, D.J., Parkinson, C.L., Gloersen, P., and Zwally, H.J. (1996). Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM\/I-SSMIS Passive Microwave Data, Version 1."},{"key":"ref_61","unstructured":"Maslanik, J., and Stroeve, J. (1999). Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations, Version 1."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"D07102","DOI":"10.1029\/2008JD010537","article-title":"Variation of hydrological regime with permafrost coverage over Lena Basin in Siberia","volume":"114","author":"Ye","year":"2009","journal-title":"J. Geophys. Res."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"237","DOI":"10.1002\/ppp.613","article-title":"Progress in Permafrost Hydrology in the New Millennium","volume":"19","author":"Woo","year":"2008","journal-title":"Permafr. Periglac. Process."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"2171","DOI":"10.1126\/science.1077445","article-title":"Increasing river discharge to the Arctic Ocean","volume":"298","author":"Peterson","year":"2002","journal-title":"Science"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"L06715","DOI":"10.1029\/2006GL025753","article-title":"A pan-arctic evaluation of changes in river discharge during the latter half of the 20th century","volume":"33","author":"McClelland","year":"2006","journal-title":"Geophys. Res. Lett."},{"key":"ref_66","unstructured":"Arctic Great Rivers Observatory (2018, March 19). Discharge Dataset, Version 20180319. Available online: https:\/\/www.arcticrivers.org\/data."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1175\/1525-7541(2004)005<0595:DCACOT>2.0.CO;2","article-title":"Discharge characteristics and changes over the Ob river watershed in Siberia","volume":"5","author":"Yang","year":"2004","journal-title":"J. Hydrometeorol."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1016\/j.jhydrol.2004.03.017","article-title":"Streamflow changes over Siberian Yenisei river basin","volume":"296","author":"Yang","year":"2004","journal-title":"J. Hydrol."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"46","DOI":"10.5670\/oceanog.2015.57","article-title":"A Synthesis of Year-Round Interdisciplinary Mooring Measurements in the Bering Strait (1990\u20132014) and the RUSALCA Years (2004\u20132011)","volume":"28","author":"Woodgate","year":"2015","journal-title":"Oceanography"},{"key":"ref_70","first-page":"L23611","article-title":"Freshwater fuxes in the East Greenland Current: A decade of observations","volume":"36","author":"Hansen","year":"2009","journal-title":"Geophys. Res. Lett."},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"431","DOI":"10.1016\/j.rse.2016.02.050","article-title":"Seasonal and interannual variations of sea surface salinity associated with the Mississippi River plume observed by SMOS and Aquarius","volume":"180","author":"Fournier","year":"2016","journal-title":"Remote Sens. Environ."},{"key":"ref_72","doi-asserted-by":"crossref","unstructured":"Wadhams, P., Aulicino, G., Parmiggiani, F., Persson, P.O.G., and Holt, B. (2018). Pancake ice thickness mapping in the Beaufort Sea from wave dispersion observed in SAR imagery. J. Geophys. Res. Oceans, 123.","DOI":"10.1002\/2017JC013003"},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"811","DOI":"10.1175\/1520-0469(1997)054<0811:AEORPF>2.0.CO;2","article-title":"An equatorial ocean recharge paradigm for ENSO. Part I: Conceptual model","volume":"54","author":"Jin","year":"1997","journal-title":"J. Atmos. Sci."},{"key":"ref_74","first-page":"14261","article-title":"An advective-reflective conceptual model for the oscillatory nature of the ENSO","volume":"103","author":"Picaut","year":"1997","journal-title":"J. Geophys. Res."},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"367","DOI":"10.1007\/s10872-014-0238-4","article-title":"ENSO indices from sea surface salinity observed by Aquarius and Argo","volume":"70","author":"Qu","year":"2014","journal-title":"J. Oceanogr."},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"7699","DOI":"10.1002\/2015JC011182","article-title":"Loitering of the retreating sea ice edge in thearctic seas","volume":"120","author":"Steele","year":"2015","journal-title":"J. Geophys. Res. 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