Ocean circulation
Sea-ice drift steers Beaufort Gyre freshwater
Open access · cc by · source: Europe PMC
How sea ice is blown in or out of the Beaufort Gyre can change liquid freshwater storage as much as the wind-driven ocean circulation itself.
How this study connects
Role on claims
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Evidence for the claim as stated.
How sea ice is blown in or out of the Beaufort Gyre can change liquid freshwater storage as much as the wind-driven ocean circulation itself.
Evidence for the claim as stated.
A CESM freshwater hosing or an Arctic gyre study is not a measured AMOC collapse.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
A CESM freshwater hosing or an Arctic gyre study is not a measured AMOC collapse.
- Supports · AMOC collapse adds only a few ppm of CO2
Study at a glance
- Design
- Computational / modelling — Four ice–ocean models with identical Beaufort High wind anomalies and ice-export sensitivity runs
- N
- N=4 · Four ice–ocean models (including MITgcm wind-rotation experiments) over 30-year wind anomalies
- Population
- Beaufort Gyre liquid freshwater and sea-ice volume under anticyclonic vs cyclonic winds
- Outcome
- Liquid freshwater storage sensitivity to sea-ice import/export versus wind-driven circulation
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
Sea-ice drift steers Beaufort Gyre freshwater
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Peak wind perturbations are 4 hPa, representative of multi-year to decadal trends.
The peak magnitude of the perturbations is 4 hPa, a magnitude chosen to be representative of multi-year to decadal trends.
Relative to the standard anticyclonic CRF, freshwater accumulation with rotated winds is reduced by 15%, or 1175 km3 after 34 years.
Relative to the BGP CRF, the FWC accumulation in the BGP10 CRF is reduced by 15%, or 1175 km 3 (after 34 years).
Key findings
All models stored liquid freshwater under anticyclonic winds and flushed it under cyclonic winds, but end-of-run anomalies differed by about a factor of two. Models that exported ice (FESOM ~2000 km3, NorESM ~3000 km3) stored less liquid freshwater. A 10° wind rotation over ice cut BGP freshwater accumulation 15% (1175 km3) and raised BGM freshwater by 17% (1230 km3) after 34 years.
Methodology
Four ice–ocean models received identical 30-year Beaufort High wind anomalies (anticyclonic BGP vs cyclonic BGM). MITgcm extra runs rotated 10 m winds 10° anticlockwise over ice to change ice export, then freshwater, ice volume, and ice–ocean fluxes were budgeted.
Limitations
Wind perturbations are idealized and held constant; turning angles are prescribed, not predicted from a full boundary-layer scheme. Repeated forcing years in some models limit realism of the 30-year response.
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