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Platelet Ice Under Arctic Pack Ice in Winter
- Source :
- EPIC3AGU Fall Meeting, online, 2020-12-01-2020-12-17, EPIC3Geophysical Research Letters, 47(16), ISSN: 0094-8276
- Publication Year :
- 2020
- Publisher :
- American Geophysical Union (AGU), 2020.
-
Abstract
- Platelet ice is a unique type of sea ice; its occurrence has numerous implications for physical and ecological systems. Mostly, platelet ice has been reported from the Antarctic where ice crystals grow in supercooled ice shelf water and accumulate below sea ice to form sub-ice platelet layers. In the Arctic however, platelet ice formation has only been sparsely documented so far. The associated formation processes and morphology differ significantly from the Antarctic, but currently remain poorly understood. Here, we present the first comprehensive, repeat in-situ observations of a decimeter thick sub-ice platelet layer under drifting pack ice of the Central Arctic in winter. Observations carried out with a remotely operated underwater vehicle (ROV) during the midwinter leg of the MOSAiC drift expedition provided clear evidence of the growth of platelet layers from supercooled water present in the ocean mixed layer. This process was observed under all ice types present during the surveys. Oceanographic data from autonomous observing platforms leads us to the conclusion that platelet ice formation is a widespread yet overlooked feature of Arctic winter sea ice growth.
- Subjects :
- geography
geography.geographical_feature_category
010504 meteorology & atmospheric sciences
Lead (sea ice)
VDP::Matematikk og Naturvitenskap: 400
Antarctic sea ice
010502 geochemistry & geophysics
01 natural sciences
Arctic ice pack
Ice shelf
The arctic
Geophysics
Oceanography
Arctic
13. Climate action
Sea ice
General Earth and Planetary Sciences
Cryosphere
14. Life underwater
human activities
Geology
VDP::Mathematics and natural science: 400
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 19448007 and 00948276
- Volume :
- 47
- Database :
- OpenAIRE
- Journal :
- Geophysical Research Letters
- Accession number :
- edsair.doi.dedup.....7f01dd953a3ac73a8a39235f5ca44503