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. Sea ice is a key component of the Arctic climate system,and has impacts on global climate. Ice concentration, thickness, and volumeare among the most important Arctic sea ice parameters. This study presentsa new record of Arctic sea ice thickness and volume from 1984 to 2018 basedon an existing satellite-derived ice age product. The relationship betweenice age and ice thickness is first established for every month based oncollocated ice age and ice thickness from submarine sonar data (1984–2000)and ICESat (2003–2008) and an empirical ice growth model. Based on thisrelationship, ice thickness is derived for the entire time period from theweekly ice age product, and the Arctic monthly sea ice volume is thencalculated. The ice-age-based thickness and volume show good agreement interms of bias and root-mean-square error with submarine, ICESat, andCryoSat-2 ice thickness, as well as ICESat and CryoSat-2 ice volume, inFebruary–March and October–November. More detailed comparisons withindependent data from Envisat for 2003 to 2010 and CryoSat-2 from CPOM, AWI,and NASA GSFC (Goddard Space Flight Center) for 2011 to 2018 show low bias in ice-age-based thickness. Theratios of the ice volume uncertainties to the mean range from 21 % to29 %. Analysis of the derived data shows that the ice-age-based sea icevolume exhibits a decreasing trend of −411  km 3  yr −1 from 1984 to2018, stronger than the trends from other datasets. Of the factors affectingthe sea ice volume trends, changes in sea ice thickness contribute more thanchanges in sea ice area, with a contribution of at least 80 % from changesin sea ice thickness from November to May and nearly 50 % in August andSeptember, while less than 30 % is from changes in sea ice area in allmonths.

Multidecadal Arctic sea ice thickness and volume derived from ice age