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<p>The characteristics of modified Circumpolar Deep Water (mCDW) on the continental shelf in Prydz Bay, East Antarctica, are studied based on hydrographic data obtained by the Chinese National Antarctic Research Expeditions across 14 summers from 1999 to 2022. In austral summer, the mCDW upwells along the upper continental slope then intrudes on the continental shelf across the shelf break in a warm tongue that gradually upwells poleward. The mCDW intrusion at the 73°E section is relatively weaker in December and stronger in February while showing significant interannual variability. During strong intrusions (January 2000 and February 2003), the mCDW extends southward to 68°S and upwells to 50 m, whereas the mCDW only reaches the shelf break during weak intrusions (December 2004, January 2006, January 2011, and February 2015). The intensity of the mCDW intrusions correlates strongly with the accumulated wind stress curl (30 days prior) north of the shelf break (73.5°–78.0°E, 64.5°–66.0°S). The summertime westerly winds play a key role in regulating the interannual variability of mCDW intrusion onto the continental shelf. A southward shift of the westerly winds promotes the upwelling and southward intrusion of mCDW across the shelf break. In addition, mCDW at 73°E can reach as far as 68°S due to the southward flow of mCDW being hindered by a northward outflowing branch of the coastal current at the Amery Ice Shelf (AIS) front. In austral summer, the mCDW had never been observed at the section along the AIS front; thus, it cannot directly contribute to the basal melting of the ice shelf.</p>

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Interannual Variation of Summertime Modified Circumpolar Deep Water Intrusions into Prydz Bay, East Antarctica

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Yaqian Liu,
  • Jiuxin Shi,
  • Yongming Sun,
  • Saisai Hou,
  • Chunhu Xie,
  • Guy D. Williams

摘要

The characteristics of modified Circumpolar Deep Water (mCDW) on the continental shelf in Prydz Bay, East Antarctica, are studied based on hydrographic data obtained by the Chinese National Antarctic Research Expeditions across 14 summers from 1999 to 2022. In austral summer, the mCDW upwells along the upper continental slope then intrudes on the continental shelf across the shelf break in a warm tongue that gradually upwells poleward. The mCDW intrusion at the 73°E section is relatively weaker in December and stronger in February while showing significant interannual variability. During strong intrusions (January 2000 and February 2003), the mCDW extends southward to 68°S and upwells to 50 m, whereas the mCDW only reaches the shelf break during weak intrusions (December 2004, January 2006, January 2011, and February 2015). The intensity of the mCDW intrusions correlates strongly with the accumulated wind stress curl (30 days prior) north of the shelf break (73.5°–78.0°E, 64.5°–66.0°S). The summertime westerly winds play a key role in regulating the interannual variability of mCDW intrusion onto the continental shelf. A southward shift of the westerly winds promotes the upwelling and southward intrusion of mCDW across the shelf break. In addition, mCDW at 73°E can reach as far as 68°S due to the southward flow of mCDW being hindered by a northward outflowing branch of the coastal current at the Amery Ice Shelf (AIS) front. In austral summer, the mCDW had never been observed at the section along the AIS front; thus, it cannot directly contribute to the basal melting of the ice shelf.