Sea ice thickness retrieval algorithms based on in situ surface elevation and thickness values for application to altimetry

摘要: [1] In situ measurements of sea ice thickness (I), snow depth (S), and freeboard (Fsn) from drilling profile lines 15 cruises into the Southern Ocean, Antarctica, were analyzed. I was calculated in Fsn S using an isostatic approach. also directly estimated as can be obtained laser altimetry. The root-mean-square difference (RMSD) between observed reduces, correlation increases substantially, when (1) values averaged over survey (∼50 m) instead single drill hole (∼1 (2) treating positive negative (Fi) separately. For small Fi, however, approximates pointing toward balance I. Our linear regression analysis suggests a direct conversion region-specific set equations. RMSD are similar to those employing models Fi However, more data would have been needed obtain significant differences most various suggested. Still our new approach gives viable alternative for Antarctic retrieval altimetric alone. Correlation observations is high. small. This estimation measurements. Such has precision ∼5 cm, neither affected by wetness or grain size nor limited S < 50 cm.