Arctic Sea Ice Freeboard Retrieval from Envisat Altimetry Data

Arctic sea ice variations are sensitive to environmental changes and global changes. Freeboard thickness two important parameters in change research. Satellite altimetry can provide long-time large-scale monitoring. We estimated the freeboard its for period from 2002 2012 Envisat satellite data. To remove geoid undulations, we reprocessed data using a newly developed mean surface (MSS) model, named DTU18. Residuals static were removed by moving average technique. then determined local height elevation profiles. validated our estimates radar products European Space Agency (ESA) Climate Change Initiative (CCI) Alfred Wegener Institute (AWI), as well Operation IceBridge (OIB) product. The overall differences between CCI AWI 0.11 ± 0.14 m 0.12 m, respectively. Our show good agreement with three areas of larger than 0.2 smaller 0.3 m. For correlate better OIB AWI. discussed. reached minimum 2008 during research period. Sharp decreases found winters 2005 2007.