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The sea ice drift is then the result of a balance between Coriolis acceleration and stresses from the ocean and atmosphere. We investigate sea ice drift using data from individual drifting buoys as well as Arctic\u2010wide gridded fields of wind, sea ice, and ocean velocity. We perform probabilistic inverse modeling of the momentum balance of free\u2010drifting sea ice, implemented to retrieve the Nansen number, scaled Rossby number, and stress turning angles. Since this problem involves a nonlinear, underconstrained system, we used a Monte Carlo guided search scheme\u2014the Neighborhood Algorithm\u2014to seek optimal parameter values for multiple observation points. We retrieve optimal drag coefficients of <jats:italic>C<\/jats:italic><jats:sub><jats:italic>A<\/jats:italic><\/jats:sub>=1.2\u00d710<jats:sup>\u22123<\/jats:sup> and <jats:italic>C<\/jats:italic><jats:sub><jats:italic>O<\/jats:italic><\/jats:sub>=2.4\u00d710<jats:sup>\u22123<\/jats:sup> from 10\u2010day averaged Arctic\u2010wide data from July 2014 that agree with the AIDJEX standard, with clear temporal and spatial variations. Inverting daily averaged buoy data give parameters that, while more accurately resolved, suggest that the forward model oversimplifies the physical system at these spatial and temporal scales. Our results show the importance of the correct representation of geostrophic currents. Both atmospheric and oceanic drag coefficients are found to decrease with shorter temporal averaging period, informing the selection of drag coefficient for short timescale climate models.<\/jats:p>","DOI":"10.1029\/2018jc014881","type":"journal-article","created":{"date-parts":[[2019,8,15]],"date-time":"2019-08-15T03:41:02Z","timestamp":1565840462000},"page":"6388-6413","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Retrieving Sea Ice Drag Coefficients and Turning Angles From In Situ and Satellite Observations Using an Inverse Modeling Framework"],"prefix":"10.1029","volume":"124","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0447-7028","authenticated-orcid":false,"given":"H. D. B. 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G.","family":"Ferreira","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences University College London  London UK"},{"name":"CERIS, Instituto Superior T\u00e9cnico, Universidade de Lisboa  Lisboa Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3372-123X","authenticated-orcid":false,"given":"A.","family":"Berbellini","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences University College London  London UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7401-8583","authenticated-orcid":false,"given":"M.","family":"Fox","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences University College London  London UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1442-7833","authenticated-orcid":false,"given":"T. W. K.","family":"Armitage","sequence":"additional","affiliation":[{"name":"Jet Propulsion Laboratory California Institute of Technology  Pasadena CA USA"}]}],"member":"13","published-online":{"date-parts":[[2019,8,31]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1029\/JC094iC10p14485"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/qj.618"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.5194\/tc-11-1767-2017"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/2015JC011579"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pepi.2016.12.005"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1175\/BAMS-D-13-00177.1"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/2013JC009712"},{"volume-title":"Sea ice concentrations from Nimbus\u20107 SMMR and DMSP SSM\/I\u2010SSMIS passive microwave data, version 1","year":"1996","author":"Cavalieri D.","key":"e_1_2_8_9_1"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1175\/JPO-D-12-0191.1"},{"key":"e_1_2_8_11_1","first-page":"27","article-title":"Ice and ocean velocity in the Arctic marginal ice zone: Ice roughness and momentum transfer","volume":"5","author":"Cole S. 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