Cristin-resultat-ID: 1908744
Sist endret: 15. juni 2021, 12:54
Resultat
Vitenskapelig foredrag
2021

Seasonal evolution and salt/freshwater fluxes of first-year sea ice: Comparison between pack ice and landfast sea ice

Bidragsytere:
  • Marc Oggier
  • Hajo Eicken
  • Robert Rember
  • Allison Fong
  • Dmitry Divine
  • Steven Fons
  • mfl.

Presentasjon

Navn på arrangementet: EGU General Assembly 2021
Sted: online
Dato fra: 19. april 2021
Dato til: 30. april 2021

Arrangør:

Arrangørnavn: EGU

Om resultatet

Vitenskapelig foredrag
Publiseringsår: 2021

Klassifisering

Vitenskapsdisipliner

Andre geofag

Emneord

Sjøis • Arktisk is

Beskrivelse Beskrivelse

Tittel

Seasonal evolution and salt/freshwater fluxes of first-year sea ice: Comparison between pack ice and landfast sea ice

Sammendrag

Sea ice affects the exchange of energy and matter between the atmosphere and the ocean from local to hemispheric scales. Salt fluxes across the ice-ocean interface that drive thermohaline mixing beneath growing sea ice are important elements of upper ocean nutrient and carbon exchange. Sea-ice melt releases freshwater into the upper ocean and results in formation of melt ponds that affect gas and energy transfer across the atmosphere-ice interface. The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) provided an opportunity to follow sea-ice evolution and exchange processes over a full seasonal cycle in a rapidly changing ice cover. To this end, approximately 25 sea-ice cores were collected at 2 distinct sites, representing first-year and multi-year ice, to monitor physical, biological and geochemical processes relevant to atmosphere-ice-ocean exchange processes. Here we compare the growth and decay of first-year ice in the Central Arctic during the winter 2019-2020 to that of landfast first-year ice at Utqiaġvik, Alaska, from 1998 to 2016. Ice stratigraphy was similar at both sites with about 15 cm of granular ice on top of columnar ice, with a comparable growth history with a similar maximum ice thickness of 1.6-1.7 m. We aggregated the sea-ice bulk salinity and temperature profiles using a degree-day approach, and examined brine and freshwater fluxes at lower and upper interfaces of the ice, respectively. Preliminary results show lower sea-ice bulk salinity during the growth season and greater desalination at the ice surface during the melt season at the MOSAiC floe in comparison to Utqiaġvik.

Bidragsytere

Marc Oggier

  • Tilknyttet:
    Forfatter

Hajo Eicken

  • Tilknyttet:
    Forfatter

Robert Rember

  • Tilknyttet:
    Forfatter

Allison Fong

  • Tilknyttet:
    Forfatter

Dmitry Divine

  • Tilknyttet:
    Forfatter
    ved Institutt for matematikk og statistikk ved UiT Norges arktiske universitet
  • Tilknyttet:
    Forfatter
    ved Forskningsavdelingen ved Norsk Polarinstitutt
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