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Wave‐Driven Flow Along a Compact Marginal Ice Zone
Author(s) -
Thomson Jim,
Lund Björn,
Hargrove John,
Smith Madison M.,
Horstmann Jochen,
MacKin Jennifer A.
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl090735
Subject(s) - forcing (mathematics) , geology , drag , geophysics , pressure ridge , mechanics , ice stream , ice sheet , fast ice , turbulence , momentum (technical analysis) , sea ice , drift ice , atmospheric sciences , climatology , arctic ice pack , physics , geomorphology , cryosphere , finance , economics
Observations of surface waves and ice drift along a compact sea ice edge demonstrate the importance of waves in a marginal ice zone. An analytic model is presented for the along‐ice drift forced by the radiation stress gradient of oblique waves. A momentum balance using quadratic drag to oppose the wave forcing is sufficient to explain the observations. Lateral shear stresses in the ice are also evaluated, though this balance does not match the observations as well. Additional forcing by local winds is included and is small relative to the wave forcing. However, the wave forcing is isolated to a narrow region around 500‐m wide, whereas the wind forcing has effects on larger scales. The simplistic drag is assessed using observations of shear and turbulent dissipation rates. The results have implications for the shape and evolution of the ice edge, because the lateral shear may be a source of instabilities.