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Greenland’s hidden fjord floors in BedMachine v3
A 150 m Greenland bed and fjord map raises sea-level potential by 7 cm and shows 30–100% more glaciers can meet warm Atlantic Water.
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Why do Greenland fjord sills matter?
They can block warm (>2.5°C) Atlantic Water from calving fronts.
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
How is the coastal bed mapped?
Mass conservation plus 30 bathymetry sources, seamless within 50 km of the coast at up to 150 m.
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
What ice volume does v3 imply?
2.99 ± 0.02 × 10^6 km³ (2.74 ± 0.02 × 10^6 Gt).
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
What sea-level potential is reported?
7.42 ± 0.05 m, 7 cm above the prior published value.
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
How many listed glaciers can meet 200 m-deep ocean water?
67 of 243, versus 32 in B2013 and 17 in RTopo-2.
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
What fraction of drainage area is newly more exposed to AW?
About 55% of ice-sheet drainage (vs 45% B2013, 35% RTopo-2).
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
Where is mass conservation applied?
Mostly where ice velocity exceeds 50 m/yr along the coast.
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
How much did MC area grow since v2?
44%, mainly on the east coast.
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
What Hayes Glacier lesson comes from the new bathymetry?
It left a ~200 m sill in 2005 into a retrograde bed and may retreat another 3 km.
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
How well did unconstrained v2 beds match new bathymetry?
For 70% of remapped glaciers, v2 was within 100 m of the new soundings.
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified
What grid is the product assembled on?
150 m Polar Stereographic North; true resolution 150–1000 m by source.
Source: BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation · DOI · quote verified