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From Jonathan Bamber: Greenland (GrIS). Two groups working on ice sheet wide time series (GEUS and BGC) using similar data for 1950-present for SMB, based on ERA5 that is then downscaled using an RCM such as MAR. GEUS have this as an operational product so that is updated routinely. For the purposes of CMIP7, historical data should ideally be 1850-2021 so this is feasible for GrIS with relatively high confidence for 1950-2021. For 1840-1950, there are other re-analysis products that have been used to reconstruct TMB. BGC time series includes GIC across the Arctic and is monthly time step for discharge and runoff pan-Arctic. Differences in the two data sets can be assessed and are likely small compared to anomalies relevant to ocean forcing. The time series is partitioned between solid (grounding line flux) and liquid phases but, currently, does not include changes in calving front position over time which is not insignificant (see e.g. Greene et al, 2024). |
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This discussion is about the observations related to historical fluxes from the Greenland ice sheets/ice shelves and peripheral glaciers.
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