Thermodynamic and Dynamic Variations in Sea Ice Thickness of the Ross Sea, Antarctica, Driven by Atmospheric Circulation

Koo, Younghyun; Xie, Hongjie; Ackley, Stephen F.

doi:10.1029/2023jc020622

i

Thermodynamic and Dynamic Variations in Sea Ice Thickness of the Ross Sea, Antarctica, Driven by Atmospheric Circulation

2024
By Koo, Younghyun ; Xie, Hongjie ; Ackley, Stephen F.

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Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Koo, Younghyun ; Xie, Hongjie ; Ackley, Stephen F.
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; NCEI (National Centers for Environmental Information)
Description:

Atmospheric circulation has significant impacts on sea ice drifting patterns and mass balance, as wind drag induces pressure ridges and leads on the sea ice surface. In this study, the spatiotemporal distributions of these dynamic sea ice deformation features in the Ross Sea are examined using ICESat‐2 (IS2) ATL10 freeboard data (2019–2022). The temporal variation of the modal sea ice thickness (SIT), caused by thermodynamic ice growth and sea ice advection, varies from 0.7–1.0 m in April to 1.0–1.6 m in July–September and decreases thereafter in the northwest (NW) and northeast (NE) sectors. This temporal variation of modal SIT agrees with the air temperature (correlation coefficients >0.5). The southwest (SW) sector shows a consistently low modal SIT (<1.0 m) because of the production of new ice in polynyas and continuous northward sea ice drift. Meanwhile, the southeast (SE) sector shows the thickest ice in Octobers 2019 and 2020 because of the advection of thick ice from the Amundsen Sea, which was reduced in 2021 and 2022. In terms of dynamic sea ice deformation, the SE sector shows the largest deformation because of the wind‐driven convergence of sea ice movement. However, such intense deformation in the SE sector diminished in 2021 and 2022 due to the dominance of strong southerly wind associated with the Amundsen Sea Low (ASL). This study emphasizes the potential of IS2 sea ice products to assess the role of atmospheric driving forces on thermodynamic and dynamic sea ice changes.
Source:

Journal of Geophysical Research: Oceans, 129(10)
DOI:

https://doi.org/10.1029/2023jc020622
ISSN:

2169-9275 ; 2169-9291
Format:

pdf
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA22OAR4320151
Rights Information:

Other
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Library
Main Document Checksum:

urn:sha-512:2fcda0df92cac0438146c93ba0e3d1a4118e974d835f34ca26fe3ccff08c0972bb6c49a6bc17ca14f33f3411bbaacec0b3bed79467ed871bb6bf57f98dbbcd91
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https://repository.library.noaa.gov/view/noaa/67962/noaa_67962_DS1.pdf
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[PDF - 10.94 MB ]

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