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Title: Disentangling the Coupled Atmosphere‐Ocean‐Ice Interactions Driving Arctic Sea Ice Response to CO 2 Increases

Abstract

A novel decomposition of the ocean heat energy that contributes to sea ice melt and growth (ocean-ice and frazil heat) into components that are driven by surface heat flux and ocean circulation changes is used to isolate the evolving roles of the atmosphere and ocean in the Arctic sea ice loss from CO2 increases. A sea ice volume budget analysis is used to separate the impacts of the anomalous frazil/ocean-ice heat from those of atmosphere-ice heat on the evolving Arctic sea ice volume. The role of atmosphere-ocean coupling in augmenting or curtailing the atmosphere- and ocean-driven sea ice losses is further isolated by comparing the ice volume budget and the anomalous frazil/ocean-ice heat components in partially and fully coupled experiments. Atmosphere-ice heat fluxes drive most of Arctic sea ice loss in the first decade following CO2 increase by increasing the sea ice top face melt in summer, while ocean circulation changes drive the loss over the longer term through the anomalous increase of heat transport into the Arctic, which drive decreases in frazil ice growth and sea ice extent in winter. Atmosphere-ocean coupling in the subpolar Atlantic further supports a negative feedback that attenuates the ocean-driven sea ice losses overmore » time; by accelerating the weakening of the Atlantic meridional overturning circulation, it causes a large cooling of the subpolar Atlantic and attenuation of the anomalous heat transport into the Arctic in winter, allowing for a seasonal Arctic sea ice in the fully coupled experiment, while the Arctic completely becomes ice free in the partially coupled experiment.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Pacific Northwest National Laboratory Richland WA USA
  2. School of Earth and Ocean Sciences University of Victoria Victoria British Columbia Canada
  3. Los Alamos National Laboratory US Department of Energy Office of Science Los Alamos NM USA
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1724243
Alternate Identifier(s):
OSTI ID: 1726223; OSTI ID: 1777529
Report Number(s):
PNNL-SA-147688
Journal ID: ISSN 1942-2466
Grant/Contract Number:  
AC05-76RL01830; AC02‐05CH11231
Resource Type:
Published Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Name: Journal of Advances in Modeling Earth Systems Journal Volume: 12 Journal Issue: 11; Journal ID: ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Garuba, Oluwayemi A., Singh, Hansi A., Hunke, Elizabeth, and Rasch, Philip J.. Disentangling the Coupled Atmosphere‐Ocean‐Ice Interactions Driving Arctic Sea Ice Response to CO 2 Increases. United States: N. p., 2020. Web. https://doi.org/10.1029/2019ms001902.
Garuba, Oluwayemi A., Singh, Hansi A., Hunke, Elizabeth, & Rasch, Philip J.. Disentangling the Coupled Atmosphere‐Ocean‐Ice Interactions Driving Arctic Sea Ice Response to CO 2 Increases. United States. https://doi.org/10.1029/2019ms001902
Garuba, Oluwayemi A., Singh, Hansi A., Hunke, Elizabeth, and Rasch, Philip J.. Sat . "Disentangling the Coupled Atmosphere‐Ocean‐Ice Interactions Driving Arctic Sea Ice Response to CO 2 Increases". United States. https://doi.org/10.1029/2019ms001902.
@article{osti_1724243,
title = {Disentangling the Coupled Atmosphere‐Ocean‐Ice Interactions Driving Arctic Sea Ice Response to CO 2 Increases},
author = {Garuba, Oluwayemi A. and Singh, Hansi A. and Hunke, Elizabeth and Rasch, Philip J.},
abstractNote = {A novel decomposition of the ocean heat energy that contributes to sea ice melt and growth (ocean-ice and frazil heat) into components that are driven by surface heat flux and ocean circulation changes is used to isolate the evolving roles of the atmosphere and ocean in the Arctic sea ice loss from CO2 increases. A sea ice volume budget analysis is used to separate the impacts of the anomalous frazil/ocean-ice heat from those of atmosphere-ice heat on the evolving Arctic sea ice volume. The role of atmosphere-ocean coupling in augmenting or curtailing the atmosphere- and ocean-driven sea ice losses is further isolated by comparing the ice volume budget and the anomalous frazil/ocean-ice heat components in partially and fully coupled experiments. Atmosphere-ice heat fluxes drive most of Arctic sea ice loss in the first decade following CO2 increase by increasing the sea ice top face melt in summer, while ocean circulation changes drive the loss over the longer term through the anomalous increase of heat transport into the Arctic, which drive decreases in frazil ice growth and sea ice extent in winter. Atmosphere-ocean coupling in the subpolar Atlantic further supports a negative feedback that attenuates the ocean-driven sea ice losses over time; by accelerating the weakening of the Atlantic meridional overturning circulation, it causes a large cooling of the subpolar Atlantic and attenuation of the anomalous heat transport into the Arctic in winter, allowing for a seasonal Arctic sea ice in the fully coupled experiment, while the Arctic completely becomes ice free in the partially coupled experiment.},
doi = {10.1029/2019ms001902},
journal = {Journal of Advances in Modeling Earth Systems},
number = 11,
volume = 12,
place = {United States},
year = {2020},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1029/2019ms001902

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