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Observations of the Size Distribution of Frazil Ice in an Ice Shelf Water Plume
Author(s) -
Frazer Eamon K.,
Langhorne Pat J.,
Leonard Greg H.,
Robinson Natalie J.,
Schumayer Dániel
Publication year - 2020
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 - 10.1029/2020gl090498
Subject(s) - geology , sea ice , ice shelf , plume , ice crystals , oceanography , geomorphology , cryosphere , meteorology , physics
The size distribution of frazil ice is currently unconstrained in ice shelf cavity modeling. Here we observe the time‐dependent behavior of the number and size of frazil ice particles in an Ice Shelf Water plume. A novel acoustic scattering inversion was used to infer frazil ice crystal diameters, assuming a log‐normal distribution. Observation sites were on land‐fast sea ice approximately 13 and 33 km from the front of the McMurdo Ice Shelf, Antarctica. The water column from the ice‐water interface to 30 m below mean sea level was monitored over 3 weeks in November of 2016 and 2017. At 15 m below sea level the mean frazil crystal diameter was ∼ 1 mm. Fractional ice volume, derived from frazil crystal size and number density, correlates with in situ supercooling (up to 50 mK at 15 m below sea level). The data presented here provide valuable input for model initiation and evaluation.