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High Salinity Shelf Water production rates in Terra Nova Bay, Ross Sea from high-resolution salinity observations

Author

Listed:
  • Una Kim Miller

    (Lamont-Doherty Earth Observatory of Columbia University)

  • Christopher J. Zappa

    (Lamont-Doherty Earth Observatory of Columbia University)

  • Arnold L. Gordon

    (Lamont-Doherty Earth Observatory of Columbia University)

  • Seung-Tae Yoon

    (Kyungpook National University)

  • Craig Stevens

    (National Institute of Water and Atmospheric Research
    University of Auckland)

  • Won Sang Lee

    (Korea Polar Research Institute)

Abstract

High Salinity Shelf Water (HSSW) formed in the Ross Sea of Antarctica is a precursor to Antarctic Bottom Water (AABW), a water mass that constitutes the bottom limb of the global overturning circulation. HSSW production rates are poorly constrained, as in-situ observations are scarce. Here, we present high-vertical-and-temporal-resolution salinity time series collected in austral winter 2017 from a mooring in Terra Nova Bay (TNB), one of two major sites of HSSW production in the Ross Sea. We calculate an annual-average HSSW production rate of ~0.4 Sv (106 m3 s−1), which we use to ground truth additional estimates across 2012–2021 made from parametrized net surface heat fluxes. We find sub-seasonal and interannual variability on the order of $$0.1$$ 0.1 $${Sv}$$ S v , with a strong dependence on variability in open-water area that suggests a sensitivity of TNB HSSW production rates to changes in the local wind regime and offshore sea ice pack.

Suggested Citation

  • Una Kim Miller & Christopher J. Zappa & Arnold L. Gordon & Seung-Tae Yoon & Craig Stevens & Won Sang Lee, 2024. "High Salinity Shelf Water production rates in Terra Nova Bay, Ross Sea from high-resolution salinity observations," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-43880-1
    DOI: 10.1038/s41467-023-43880-1
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    References listed on IDEAS

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    1. Pasquale Castagno & Vincenzo Capozzi & Giacomo R. DiTullio & Pierpaolo Falco & Giannetta Fusco & Stephen R. Rintoul & Giancarlo Spezie & Giorgio Budillon, 2019. "Rebound of shelf water salinity in the Ross Sea," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    2. Kathryn L. Gunn & Stephen R. Rintoul & Matthew H. England & Melissa M. Bowen, 2023. "Recent reduced abyssal overturning and ventilation in the Australian Antarctic Basin," Nature Climate Change, Nature, vol. 13(6), pages 537-544, June.
    3. Qian Li & Matthew H. England & Andrew McC. Hogg & Stephen R. Rintoul & Adele K. Morrison, 2023. "Abyssal ocean overturning slowdown and warming driven by Antarctic meltwater," Nature, Nature, vol. 615(7954), pages 841-847, March.
    4. Mark D. Powell & Peter J. Vickery & Timothy A. Reinhold, 2003. "Reduced drag coefficient for high wind speeds in tropical cyclones," Nature, Nature, vol. 422(6929), pages 279-283, March.
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