{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T10:58:18Z","timestamp":1762253898620,"version":"build-2065373602"},"reference-count":76,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2021,8,19]],"date-time":"2021-08-19T00:00:00Z","timestamp":1629331200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["1835784"],"award-info":[{"award-number":["1835784"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000104","name":"National Aeronautics and Space Administration","doi-asserted-by":"publisher","award":["80NSSC18K0843","80NSSC19M0194"],"award-info":[{"award-number":["80NSSC18K0843","80NSSC19M0194"]}],"id":[{"id":"10.13039\/100000104","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>NASA\u2019s ICESat-2 has been providing sea ice freeboard measurements across the polar regions since October 2018. In spite of the outstanding spatial resolution and precision of ICESat-2, the spatial sparsity of the data can be a critical issue for sea ice monitoring. This study employs a geostatistical approach (i.e., ordinary kriging) to characterize the spatial autocorrelation of the ICESat-2 freeboard measurements (ATL10) to estimate weekly freeboard variations in 2019 for the entire Ross Sea area, including where ICESat-2 tracks are not directly available. Three variogram models (exponential, Gaussian, and spherical) are compared in this study. According to the cross-validation results, the kriging-estimated freeboards show correlation coefficients of 0.56\u20130.57, root mean square error (RMSE) of ~0.12 m, and mean absolute error (MAE) of ~0.07 m with the actual ATL10 freeboard measurements. In addition, the estimated errors of the kriging interpolation are low in autumn and high in winter to spring, and low in southern regions and high in northern regions of the Ross Sea. The effective ranges of the variograms are 5\u201310 km and the results from the three variogram models do not show significant differences with each other. The southwest (SW) sector of the Ross Sea shows low and consistent freeboard over the entire year because of the frequent opening of wide polynya areas generating new ice in this sector. However, the southeast (SE) sector shows large variations in freeboard, which demonstrates the advection of thick multiyear ice from the Amundsen Sea into the Ross Sea. Thus, this kriging-based interpolation of ICESat-2 freeboard can be used in the future to estimate accurate sea ice production over the Ross Sea by incorporating other remote sensing data.<\/jats:p>","DOI":"10.3390\/rs13163277","type":"journal-article","created":{"date-parts":[[2021,8,19]],"date-time":"2021-08-19T09:58:06Z","timestamp":1629367086000},"page":"3277","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Weekly Mapping of Sea Ice Freeboard in the Ross Sea from ICESat-2"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9235-5009","authenticated-orcid":false,"given":"YoungHyun","family":"Koo","sequence":"first","affiliation":[{"name":"Department of Earth and Planetary Sciences, University of Texas at San Antonio, San Antonio, TX 78249, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3516-1210","authenticated-orcid":false,"given":"Hongjie","family":"Xie","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences, University of Texas at San Antonio, San Antonio, TX 78249, USA"}]},{"given":"Nathan T.","family":"Kurtz","sequence":"additional","affiliation":[{"name":"Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA"}]},{"given":"Stephen F.","family":"Ackley","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences, University of Texas at San Antonio, San Antonio, TX 78249, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3546-3668","authenticated-orcid":false,"given":"Alberto M.","family":"Mestas-Nu\u00f1ez","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences, University of Texas at San Antonio, San Antonio, TX 78249, USA"}]}],"member":"1968","published-online":{"date-parts":[[2021,8,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2012JC008141","article-title":"Satellite observations of Antarctic sea ice thickness and volume","volume":"117","author":"Kurtz","year":"2012","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"12417","DOI":"10.1029\/93JC00648","article-title":"East Antarctic sea ice: Albedo, thickness distribution, and snow cover","volume":"98","author":"Allison","year":"1993","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"413","DOI":"10.1029\/2000RG000085","article-title":"Snow on Antarctic sea ice","volume":"39","author":"Massom","year":"2001","journal-title":"Rev. Geophys."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1334","DOI":"10.1038\/nature09051","article-title":"The central role of diminishing sea ice in recent Arctic temperature amplification","volume":"464","author":"Screen","year":"2010","journal-title":"Nature"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"3606","DOI":"10.1175\/JCLI3489.1","article-title":"Surface Albedo of the Antarctic Sea Ice Zone","volume":"18","author":"Brandt","year":"2005","journal-title":"J. Clim."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"85","DOI":"10.1016\/j.gloplacha.2011.03.004","article-title":"Processes and impacts of Arctic amplification: A research synthesis","volume":"77","author":"Serreze","year":"2011","journal-title":"Glob. Planet. Chang."},{"key":"ref_7","first-page":"17","article-title":"Two Stable Modes of Southern Ocean Winter Stratification","volume":"Volume 57","author":"Chu","year":"1991","journal-title":"Deep Convection and Deep Water Formation in the Oceans"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"2323","DOI":"10.1175\/1520-0493(1981)109<2323:LSVIOA>2.0.CO;2","article-title":"Large-Scale Variations in Observed Antarctic Sea Ice Extent and Associated Atmospheric Circulation","volume":"109","author":"Cavalieri","year":"1981","journal-title":"Mon. Weather Rev."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"2251","DOI":"10.1175\/JCLI-D-16-0408.1","article-title":"Positive Trend in the Antarctic Sea Ice Cover and Associated Changes in Surface Temperature","volume":"30","author":"Comiso","year":"2017","journal-title":"J. Clim."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"17","DOI":"10.1093\/icb\/31.1.17","article-title":"Antarctic Sea Ice Biota","volume":"31","author":"Garrison","year":"1991","journal-title":"Am. Zool."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"429","DOI":"10.1007\/BF00243114","article-title":"Ecology of sea ice biota","volume":"12","author":"Legendre","year":"1992","journal-title":"Polar Biol."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Kwok, R., and Rothrock, D.A. (2009). Decline in Arctic sea ice thickness from submarine and ICESat records: 1958\u20132008. Geophys. Res. Lett., 36.","DOI":"10.1029\/2009GL039035"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"18","DOI":"10.3189\/2015AoG69A909","article-title":"Comparing and contrasting the behaviour of Arctic and Antarctic sea ice over the 35 year period 1979\u20132013","volume":"56","author":"Simmonds","year":"2015","journal-title":"Ann. Glaciol."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Comiso, J.C., Parkinson, C.L., Gersten, R., and Stock, L. (2008). Accelerated decline in the Arctic sea ice cover. Geophys. Res. Lett., 35.","DOI":"10.1029\/2007GL031972"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Kurtz, N.T., Markus, T., Farrell, S.L., Worthen, D.L., and Boisvert, L.N. (2011). Observations of recent Arctic sea ice volume loss and its impact on ocean-atmosphere energy exchange and ice production. J. Geophys. Res. Oceans, 116.","DOI":"10.1029\/2010JC006235"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"747","DOI":"10.1126\/science.aag2345","article-title":"Observed Arctic sea-ice loss directly follows anthropogenic CO2 emission","volume":"354","author":"Notz","year":"2016","journal-title":"Science"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"14414","DOI":"10.1073\/pnas.1906556116","article-title":"A 40-y record reveals gradual Antarctic sea ice increases followed by decreases at rates far exceeding the rates seen in the Arctic","volume":"116","author":"Parkinson","year":"2019","journal-title":"Proc. Natl. Acad. Sci. USA"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"237","DOI":"10.1007\/s00382-018-4579-3","article-title":"Detecting the statistical significance of the trends in the Antarctic sea ice extent: An indication for a turning point","volume":"53","author":"Ludescher","year":"2019","journal-title":"Clim. Dyn."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1016\/j.ocemod.2013.01.003","article-title":"A model reconstruction of the Antarctic sea ice thickness and volume changes over 1980\u20132008 using data assimilation","volume":"64","author":"Massonnet","year":"2013","journal-title":"Ocean Model."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"3784","DOI":"10.1175\/JCLI-D-13-00301.1","article-title":"Modeled trends in antarctic sea ice thickness","volume":"27","author":"Holland","year":"2014","journal-title":"J. Clim."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"871","DOI":"10.5194\/tc-6-871-2012","article-title":"Antarctic sea ice variability and trends, 1979\u20132010","volume":"6","author":"Parkinson","year":"2012","journal-title":"Cryosphere"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"41096","DOI":"10.1038\/srep41096","article-title":"Increase of the Antarctic Sea Ice Extent is highly significant only in the Ross Sea","volume":"7","author":"Yuan","year":"2017","journal-title":"Sci. Rep."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"2967","DOI":"10.1002\/2015JC011537","article-title":"Sea ice production variability in Antarctic coastal polynyas","volume":"121","author":"Tamura","year":"2016","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Tamura, T., Ohshima, K.I., and Nihashi, S. (2008). Mapping of sea ice production for Antarctic coastal polynyas. Geophys. Res. Lett., 35.","DOI":"10.1029\/2007GL032903"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"3912","DOI":"10.1109\/JSTARS.2017.2731995","article-title":"Sea-Ice Production in Antarctic Coastal Polynyas Estimated from AMSR2 Data and Its Validation Using AMSR-E and SSM\/I-SSMIS Data","volume":"10","author":"Nihashi","year":"2017","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1017\/aog.2019.49","article-title":"Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003\u20132008) observations","volume":"61","author":"Tian","year":"2020","journal-title":"Ann. Glaciol."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Dai, L., Xie, H., Ackley, S.F., and Mestas-Nu\u00f1ez, A.M. (2020). Ice Production in Ross Ice Shelf Polynyas during 2017\u20132018 from Sentinel\u20131 SAR Images. Remote Sens., 12.","DOI":"10.3390\/rs12091484"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"44","DOI":"10.1016\/j.rse.2018.09.031","article-title":"Spatio-temporal variability of Antarctic sea-ice thickness and volume obtained from ICESat data using an innovative algorithm","volume":"219","author":"Li","year":"2018","journal-title":"Remote Sens. Environ."},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Drucker, R., Martin, S., and Kwok, R. (2011). Sea ice production and export from coastal polynyas in the Weddell and Ross Seas. Geophys. Res. Lett., 38.","DOI":"10.1029\/2011GL048668"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"187","DOI":"10.3189\/172756401781818770","article-title":"Sea-ice thickness and roughness in the Ross Sea, Antartica","volume":"33","author":"Tin","year":"2001","journal-title":"Ann. Glaciol."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1016\/j.rse.2016.12.029","article-title":"The Ice, Cloud, and land Elevation Satellite-2 (ICESat-2): Science requirements, concept, and implementation","volume":"190","author":"Markus","year":"2017","journal-title":"Remote Sens. Environ."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Magruder, L.A., Brunt, K.M., and Alonzo, M. (2020). Early icesat-2 on-orbit geolocation validation using ground-based corner cube retro-reflectors. Remote Sens., 12.","DOI":"10.3390\/rs12213653"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"405","DOI":"10.1016\/S0264-3707(02)00042-X","article-title":"ICESat\u2019s laser measurements of polar ice, atmosphere, ocean, and land","volume":"34","author":"Zwally","year":"2002","journal-title":"J. Geodyn."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"4453","DOI":"10.5194\/tc-14-4453-2020","article-title":"The Antarctic sea ice cover from ICESat-2 and CryoSat-2: Freeboard, snow depth and ice thickness","volume":"14","author":"Kacimi","year":"2020","journal-title":"Cryosph. Discuss."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"e2019JC015764","DOI":"10.1029\/2019JC015764","article-title":"Winter Arctic sea ice thickness from ICESat-2 freeboards","volume":"125","author":"Petty","year":"2020","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2019JC016008","article-title":"Arctic Snow Depth and Sea Ice Thickness From ICESat-2 and CryoSat-2 Freeboards: A First Examination","volume":"125","author":"Kwok","year":"2020","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"6942","DOI":"10.1029\/2019JC015486","article-title":"Surface Height and Sea Ice Freeboard of the Arctic Ocean From ICESat-2: Characteristics and Early Results","volume":"124","author":"Kwok","year":"2019","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_38","first-page":"101","article-title":"Winter Atmospheric Forcing of the Ross Sea Polynya","volume":"75","author":"Bromwich","year":"1998","journal-title":"Ocean Ice Atmos. Interact. Antarct. Continenal Margin"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"267","DOI":"10.5194\/tc-11-267-2017","article-title":"Atmospheric forcing of sea ice anomalies in the Ross Sea polynya region","volume":"11","author":"Dale","year":"2017","journal-title":"Cryosphere"},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Kwok, R., Comiso, J.C., Martin, S., and Drucker, R. (2007). Ross Sea polynyas: Response of ice concentration retrievals to large areas of thin ice. J. Geophys. Res. Oceans, 112.","DOI":"10.1029\/2006JC003967"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"228","DOI":"10.1016\/j.ecoinf.2010.12.003","article-title":"A review of comparative studies of spatial interpolation methods in environmental sciences: Performance and impact factors","volume":"6","author":"Li","year":"2011","journal-title":"Ecol. Inform."},{"key":"ref_42","unstructured":"Chang, K.-T. (2016). Introduction to Geographic Information Systems, McGraw-Hill Education. [8th ed.]."},{"key":"ref_43","first-page":"119","article-title":"A statistical approach to some basic mine valuation problems on the Witwatersrand","volume":"52","author":"Krige","year":"1951","journal-title":"J. Soc. Afr. Inst. Min. Metall."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"3038","DOI":"10.1109\/TGRS.2006.883349","article-title":"Geostatistical characterization of snow-depth structures on sea ice near Point Barrow, Alaska\u2014A contribution to the AMSR-Ice03 field validation campaign","volume":"44","author":"Herzfeld","year":"2006","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1080\/07055900.1999.9649620","article-title":"An examination of the distribution of snow on sea-ice","volume":"37","author":"Iacozza","year":"1999","journal-title":"Atmos. Ocean"},{"key":"ref_46","first-page":"4997","article-title":"Estimating spatial distribution of daily snow depth with kriging methods: Combination of MODIS snow cover area data and ground-based observations","volume":"9","author":"Huang","year":"2015","journal-title":"Cryosph. Discuss."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"251","DOI":"10.3189\/172756404781814159","article-title":"Geostatistical estimation from radar altimeter data with respect to morphological units outlined by SAR data: Application to Lambert Glacier\/Amery Ice shelf, East Antarctica","volume":"39","author":"Stosius","year":"2004","journal-title":"Ann. Glaciol."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"485","DOI":"10.3189\/002214311796905659","article-title":"Antarctic ice-shelf thickness from satellite radar altimetry","volume":"57","author":"Griggs","year":"2011","journal-title":"J. Glaciol."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"499","DOI":"10.1007\/s11004-019-09851-3","article-title":"How Different Analysis and Interpolation Methods Affect the Accuracy of Ice Surface Elevation Changes Inferred from Satellite Altimetry","volume":"52","author":"Horwath","year":"2020","journal-title":"Math. Geosci."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2011JF002072","article-title":"Spatiotemporal interpolation of elevation changes derived from satellite altimetry for Jakobshavn Isbr, Greenland","volume":"117","author":"Hurkmans","year":"2012","journal-title":"J. Geophys. Res. Earth Surf."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"1725","DOI":"10.5194\/tc-8-1725-2014","article-title":"Time-evolving mass loss of the Greenland Ice Sheet from satellite altimetry","volume":"8","author":"Hurkmans","year":"2014","journal-title":"Cryosphere"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2012GL053576","article-title":"Seasonal forecasts of Arctic sea ice initialized with observations of ice thickness","volume":"39","author":"Lindsay","year":"2012","journal-title":"Geophys. Res. Lett."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"1035","DOI":"10.5194\/tc-7-1035-2013","article-title":"Sea ice thickness, freeboard, and snow depth products from Operation IceBridge airborne data","volume":"7","author":"Kurtz","year":"2013","journal-title":"Cryosphere"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"1843","DOI":"10.1016\/j.pnsc.2009.07.012","article-title":"A new interpolation method for Antarctic surface temperature","volume":"19","author":"Wang","year":"2009","journal-title":"Prog. Nat. Sci."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"235","DOI":"10.3189\/172756400781820769","article-title":"Geostatistical analysis of glacier-roughness data","volume":"30","author":"Herzfeld","year":"2000","journal-title":"Ann. Glaciol."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"9461","DOI":"10.1029\/JC095iC06p09461","article-title":"Polynyas and leads: An overview of physical processes and environment","volume":"95","author":"Smith","year":"1990","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"13045","DOI":"10.1029\/93JD00562","article-title":"Hemispheric atmospheric variations and oceanographic impacts associated with katabatic surges across the Ross ice shelf, Antarctica","volume":"98","author":"Bromwich","year":"1993","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"3329","DOI":"10.5194\/tc-14-3329-2020","article-title":"Frazil ice growth and production during katabatic wind events in the Ross Sea, Antarctica","volume":"14","author":"Thompson","year":"2020","journal-title":"Cryosphere"},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"11228","DOI":"10.1029\/2019GL084976","article-title":"ICESat-2 Surface Height and Sea Ice Freeboard Assessed With ATM Lidar Acquisitions From Operation IceBridge","volume":"46","author":"Kwok","year":"2019","journal-title":"Geophys. Res. Lett."},{"key":"ref_60","unstructured":"Kwok, R., Cunningham, G., Hancock, D., Ivanoff, A., and Wimert, J. (2019). Algorithm Theoretical Basis Document (ATBD): Sea Ice Products, NASA Goddard Space Flight Center."},{"key":"ref_61","doi-asserted-by":"crossref","unstructured":"Abzalov, M. (2016). Introduction to Geostatistics. Applied Mining Geology, Springer International Publishing.","DOI":"10.1007\/978-3-319-39264-6_17"},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"e2019JC015820","DOI":"10.1029\/2019JC015820","article-title":"Sea ice roughness overlooked as a key source of uncertainty in CryoSat-2 ice freeboard retrievals","volume":"125","author":"Landy","year":"2020","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"2098","DOI":"10.1109\/TGRS.2011.2170843","article-title":"A first assessment of IceBridge Snow and Ice thickness data over arctic sea ice","volume":"50","author":"Farrell","year":"2012","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"5202","DOI":"10.1002\/jgrc.20393","article-title":"Thinning of Arctic sea ice observed in Fram Strait: 1990\u20132011","volume":"118","author":"Hansen","year":"2013","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2020GL088209","article-title":"Decay of the Snow Cover Over Arctic Sea Ice From ICESat-2 Acquisitions During Summer Melt in 2019","volume":"47","author":"Kwok","year":"2020","journal-title":"Geophys. Res. Lett."},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"1763","DOI":"10.1213\/ANE.0000000000002864","article-title":"Correlation coefficients: Appropriate use and interpretation","volume":"126","author":"Schober","year":"2018","journal-title":"Anesth. Analg."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"e2020GL090866","DOI":"10.1029\/2020GL090866","article-title":"Sea Ice Thickness in the Western Ross Sea","volume":"48","author":"Rack","year":"2020","journal-title":"Geophys. Res. Lett."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1525\/elementa.226","article-title":"Sea ice drift in the Southern Ocean: Regional patterns, variability, and trends","volume":"5","author":"Kwok","year":"2017","journal-title":"Elem. Sci. Anthr."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"1250","DOI":"10.1016\/j.dsr2.2010.12.005","article-title":"Estimating the annual cycle of sea-ice thickness and volume in the Ross Sea","volume":"58","author":"DeLiberty","year":"2011","journal-title":"Deep Sea Res. Part II Top. Stud. Oceanogr."},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2007JC004254","article-title":"Thickness distribution of Antarctic sea ice","volume":"113","author":"Worby","year":"2008","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"3759","DOI":"10.1175\/JCLI3507.1","article-title":"Ross sea ice motion, area flux, and deformation","volume":"18","author":"Kwok","year":"2005","journal-title":"J. Clim."},{"key":"ref_72","unstructured":"U.S. National Ice Center (2006). National Ice Center Arctic Sea Ice Charts and Climatologies in Gridded Format, U.S. National Ice Center."},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"3807","DOI":"10.1002\/jgrc.20252","article-title":"Sea ice thickness retrieval algorithms based on in situ surface elevation and thickness values for application to altimetry","volume":"118","author":"Ackley","year":"2013","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_74","doi-asserted-by":"crossref","first-page":"181","DOI":"10.1017\/aog.2020.31","article-title":"Sea-ice production and air\/ice\/ocean\/biogeochemistry interactions in the Ross Sea during the PIPERS 2017 autumn field campaign","volume":"61","author":"Ackley","year":"2020","journal-title":"Ann. Glaciol."},{"key":"ref_75","doi-asserted-by":"crossref","unstructured":"Soares, A. (1993). How Large a Sample Is Needed to Estimate the Regional Variogram Adequately? BT\u2014Geostatistics Tr\u00f3ia \u201992: Volume 1, Springer.","DOI":"10.1007\/978-94-011-1739-5"},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"177","DOI":"10.1111\/j.1365-2389.1992.tb00128.x","article-title":"Sample adequately to estimate variograms of soil properties","volume":"43","author":"Webster","year":"1992","journal-title":"J. Soil Sci."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/16\/3277\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:47:04Z","timestamp":1760165224000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/16\/3277"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,8,19]]},"references-count":76,"journal-issue":{"issue":"16","published-online":{"date-parts":[[2021,8]]}},"alternative-id":["rs13163277"],"URL":"https:\/\/doi.org\/10.3390\/rs13163277","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2021,8,19]]}}}