Temporal Changes in the Antarctic Circumpolar Current: Implications for the Antarctic Continental Shelves

Gille, Sarah T.; McKee, Darren C.; Martinson, Douglas G.

doi:10.5670/oceanog.2016.102

Cited by 28 publications

(27 citation statements)

References 87 publications

(116 reference statements)

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“…As a consequence, high insolation alone cannot account for the extreme ocean temperatures we observe around Antarctica during MIS31. We argue here that the exceptional warmth is the consequence of an increasingly stratified ocean due to freshwater input from ice loss (Golledge et al, 2014) rather than a trigger for ice loss.…”

Section: Discussionmentioning

confidence: 73%

“…We suggest ice margin retreat was caused by circulation changes in Antarctic coastal waters, as a result of changes in wind patterns (Gille et al, 2016). winds (Sverdrup, 1953).…”

Section: Discussionmentioning

confidence: 88%

“…winds (Sverdrup, 1953). Ocean model simulations have demonstrated that a poleward shift of the SHWW reduces the extent and strength of the coastal easterlies and can produce strikethrough advective warming of subsurface waters at the Antarctic margin, via a weakening of the ASF that allows CDW to intrude onto the shelf (Schmidtko et al, 2014;Gille et al, 2016). Heat from the CDW would subsequently trigger basal melting of the ice shelves (Dinniman et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Precise dynamics underlying such wind-driven CDW inflow however remain an area of active research (Gille et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

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Southern Ocean temperature records and ice-sheet models demonstrate rapid Antarctic ice sheet retreat under low atmospheric CO2 during Marine Isotope Stage 31

Beltran

Golledge

Ohneiser

et al. 2020

Quaternary Science Reviews

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Highlights-We quantify precisely the magnitude of ocean warming using the first ever Southern Ocean molecular paleo-temperature reconstructions during the warm Marine Isotope Stage 31 (MIS31-1.085 and 1.055 million years ago).-Our data show a sustained surface Southern Ocean warming and a collapse of the Antarctic and sub Antarctic ocean fronts during that warm period and under low atmospheric CO 2 concentrations.-We use sea surface temperature reconstructions to test the scenarios for the AIS retreat during MIS31 using coupled ice-sheet/ice-shelf model.-We propose a two-step model for deglaciating West Antarctica which involves mild ocean warming (a new temperature threshold) which forces ice margin retreat followed by rapid ocean warming as the ice sheet retreats.-Our work shows that the Paris Agreement target temperature of 1.5°C is sufficient to drive runaway retreat of the West Antarctic Ice Sheet. We derive this conclusion from the robust, ocean temperature proxy record and ice sheet simulation.

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Section: Discussionmentioning

confidence: 73%

“…We suggest ice margin retreat was caused by circulation changes in Antarctic coastal waters, as a result of changes in wind patterns (Gille et al, 2016). winds (Sverdrup, 1953).…”

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

“…Precise dynamics underlying such wind-driven CDW inflow however remain an area of active research (Gille et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

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Southern Ocean temperature records and ice-sheet models demonstrate rapid Antarctic ice sheet retreat under low atmospheric CO2 during Marine Isotope Stage 31

Beltran

Golledge

Ohneiser

et al. 2020

Quaternary Science Reviews

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“…The cross‐ACS heat transport may be modified by changes in the stratification of the ASC/ASUC system or the ACC (through thermal wind shear, e.g., Chavanne et al, ; Martinson & McKee, ; Walker et al, , ) by a poleward migration of the Southern ACC front, or by an increase in the cross‐ACC eddy heat transport. At present, a robust change in the zonally averaged latitude of the ACC has not been observed (Gille et al, ), although a more localized incursion of its southern front (e.g., Figure S8) could also be capable of delivering heat to previously sheltered ice shelves in key regions. The large‐scale shoaling and deepening trends in the CDW core along the ACS and their correlation with the temperature trends at the bottom of the adjacent shelf (Schmidtko et al, , their Figure 2) can perhaps be explained by a combination of these processes.…”

Section: Discussionmentioning

confidence: 93%

Oceanic Heat Delivery to the Antarctic Continental Shelf: Large‐Scale, Low‐Frequency Variability

2018

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Onshore penetration of oceanic water across the Antarctic continental slope (ACS) plays a major role in global sea level rise by delivering heat to the Antarctic marginal seas, thus contributing to the basal melting of ice shelves. Here the time‐mean (Φmean) and eddy (Φeddy) components of the heat transport (Φ) across the 1,000‐m isobath along the entire ACS are investigated using a 0.1∘ global coupled ocean/sea ice simulation based on the Los Alamos Parallel Ocean Program (POP) and sea ice (Community Ice CodE) models. Comparison with in situ hydrography shows that the model successfully represents the basic water mass structure, with a warm bias in the Circumpolar Deep Water layer. Segments of on‐shelf Φ, with lengths of O(100–1,000 km), are found along the ACS. The circumpolar integral of the annually averaged Φ is O(20 TW), with Φeddy always on‐shelf, while Φmean fluctuates between on‐shelf and off‐shelf. Stirring along isoneutral surfaces is often the dominant process by which eddies transport heat across the ACS, but advection of heat by both mean flow‐topography interactions and eddies can also be significant depending on the along‐ and across‐slope location. The seasonal and interannual variability of the circumpolarly integrated Φmean is controlled by convergence of Ekman transport within the ACS. Prominent warming features at the bottom of the continental shelf (consistent with observed temperature trends) are found both during high‐Southern Annular Mode and high‐Niño 3.4 periods, suggesting that climate modes can modulate the heat transfer from the Southern Ocean to the ACS across the entire Antarctic margin.

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Mixing in the Southern Ocean

et al. 2022

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Temporal Changes in the Antarctic Circumpolar Current: Implications for the Antarctic Continental Shelves

Cited by 28 publications

References 87 publications

Southern Ocean temperature records and ice-sheet models demonstrate rapid Antarctic ice sheet retreat under low atmospheric CO2 during Marine Isotope Stage 31

Southern Ocean temperature records and ice-sheet models demonstrate rapid Antarctic ice sheet retreat under low atmospheric CO2 during Marine Isotope Stage 31

Oceanic Heat Delivery to the Antarctic Continental Shelf: Large‐Scale, Low‐Frequency Variability

Mixing in the Southern Ocean

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