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GEUS-Glaciology-and-Climate / ice_discharge

Greenland Ice Sheet solid ice discharge from 1986 through last month
https://doi.org/10.5194/essd-12-1367-2020
GNU Lesser General Public License v3.0
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Kangerlussuaq glacier in SE produces unrealistic values #36

Closed signehl closed 2 years ago

signehl commented 2 years ago

After updating Sentinel1 IV in June, output from Kangerlussuaq glacier is low. The gate is now too close to the margin and needs to be moved inland.

signehl commented 2 years ago

Similar issue occurred in 2021 with the gate of at Sermeq Kujalleq/Jakobshavn Isbræ i 2021 (issue #24). A similar approach to #24 is used here to move the gate inland. The old gate in red and the new in green is seen here along with calving front positions from 2015-2019. The new gate is approximately 5 km from the 2019 front.

Kangerlussuaq_gate_old_new

The discharge is increased by the move:

comparing_gates

signehl commented 2 years ago

The mean flux from the gate shifted by 1.7 Gt/yr (or 7%), which is within the mean of the error of 1.9 Gt/yr. On a regional scale (SE) the change is around 0.02 %

mankoff commented 2 years ago

Closed in 8c31018913ea65ca7ecb073d18365dda76c7bbef