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Observations of flooding and snow-ice formation in a thinner Arctic sea ice regime during the N-ICE2015 campaign: Influence of basal ice melt and storms
- Source :
- Journal of Geophysical Research. Oceans, Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2017, 122 (9), pp.7115-7134. ⟨10.1002/2016JC012011⟩, Journal of Geophysical Research. Oceans, 2017, 122 (9), pp.7115-7134. ⟨10.1002/2016JC012011⟩
- Publication Year :
- 2017
- Publisher :
- HAL CCSD, 2017.
-
Abstract
- Seven ice mass balance instruments deployed near 83°N on different first-year and second-year ice floes, representing variable snow and ice conditions, documented the evolution of snow and ice conditions in the Arctic Ocean north of Svalbard in January–March 2015. Frequent profiles of temperature and thermal diffusivity proxy were recorded to distinguish changes in snow depth and ice thickness with 2 cm vertical resolution. Four instruments documented flooding and snow-ice formation. Flooding was clearly detectable in the simultaneous changes in thermal diffusivity proxy, increased temperature, and heat propagation through the underlying ice. Slush then progressively transformed into snow-ice. Flooding resulted from two different processes: (i) after storm-induced breakup of snow-loaded floes and (ii) after loss of buoyancy due to basal ice melt. In the case of breakup, when the ice was cold and not permeable, rapid flooding, probably due to lateral intrusion of seawater, led to slush and snow-ice layers at the ocean freezing temperature (−1.88°C). After the storm, the instruments documented basal sea-ice melt over warm Atlantic waters and ocean-to-ice heat flux peaked at up to 400 W m−2. The warm ice was then permeable and flooding was more gradual probably involving vertical intrusion of brines and led to colder slush and snow-ice (−3°C). The N-ICE2015 campaign provided the first documentation of significant flooding and snow-ice formation in the Arctic ice pack as the slush partially refroze. Snow-ice formation may become a more frequently observed process in a thinner ice Arctic.
- Subjects :
- Arctic sea ice decline
Slush
010504 meteorology & atmospheric sciences
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
medicine.medical_treatment
010502 geochemistry & geophysics
Oceanography
Atmospheric sciences
01 natural sciences
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
medicine
Sea ice
Ice pack
14. Life underwater
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
geography
geography.geographical_feature_category
Snow
Arctic ice pack
Arctic geoengineering
Geophysics
Arctic
13. Climate action
Space and Planetary Science
Geology
Subjects
Details
- Language :
- English
- ISSN :
- 21699275 and 21699291
- Database :
- OpenAIRE
- Journal :
- Journal of Geophysical Research. Oceans, Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2017, 122 (9), pp.7115-7134. ⟨10.1002/2016JC012011⟩, Journal of Geophysical Research. Oceans, 2017, 122 (9), pp.7115-7134. ⟨10.1002/2016JC012011⟩
- Accession number :
- edsair.doi.dedup.....59ed24752fcc4906337f74c1d6013c38