Greenland ice sheet mass balance from 1840 through next week

[摘要] The mass of the Greenland ice sheet is declining as mass gain from snowaccumulation is exceeded by mass loss from surface meltwater runoff,marine-terminating glacier calving and submarine melting, and basalmelting. Here we use the input–output (IO) method to estimate mass change from 1840 through next week. Surface mass balance (SMB) gains and losses come froma semi-empirical SMB model from 1840 through 1985 and three regional climate models (RCMs; HIRHAM/HARMONIE, Modèle Atmosphérique Régional – MAR, and RACMO – Regional Atmospheric Climate MOdel) from 1986 through nextweek. Additional non-SMB losses come from a marine-terminating glacier ice discharge product and a basal mass balance model. From these products weprovide an annual estimate of Greenland ice sheet mass balance from 1840through 1985 and a daily estimate at sector and region scale from 1986 throughnext week. This product updates daily and is the first IO product to includethe basal mass balance which is a source of an additional ∼24   Gt yr −1 of mass loss. Our results demonstrate an acceleratingice-sheet-scale mass loss and general agreement (coefficient of determination, r 2 , ranges from 0.62 to 0.94) among six other products, includinggravitational, volume, and other IO mass balance estimates. Results from thisstudy are available at https://doi.org/10.22008/FK2/OHI23Z ( Mankoff et al. ,  2021 ) .

[学科分类] 眼科学