Variability of Circumpolar Deep Water transport onto the Amundsen Sea Continental shelf through a shelf break trough

Assmann, Karen M.; Jenkins, Adrian; Shoosmith, Deborah R.; Walker, Dziga P.; Jacobs, Stanley S.; Nicholls, Keith W.

doi:10.1002/2013jc008871

Cited by 112 publications

(159 citation statements)

References 55 publications

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“…Circumpolar deep-water circulation patterns appear to be driving recent WAIS decline (30,31), but again the record of these patterns is sparse and brief and shows considerable variability, with no clear linkage to greenhouse gas forcing (19,(32)(33)(34). Nor is it completely certain that the loss of the Thwaites and Pine Island glaciers would lead to full WAIS destabilization.…”

Section: Wais Collapsementioning

confidence: 99%

Carbon choices determine US cities committed to futures below sea level

Strauss

Kulp

Levermann

2015

Proc. Natl. Acad. Sci. U.S.A.

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Anthropogenic carbon emissions lock in long-term sea-level rise that greatly exceeds projections for this century, posing profound challenges for coastal development and cultural legacies. Analysis based on previously published relationships linking emissions to warming and warming to rise indicates that unabated carbon emissions up to the year 2100 would commit an eventual global sea-level rise of 4.3-9.9 m. Based on detailed topographic and population data, local high tide lines, and regional long-term sea-level commitment for different carbon emissions and ice sheet stability scenarios, we compute the current population living on endangered land at municipal, state, and national levels within the United States. For unabated climate change, we find that land that is home to more than 20 million people is implicated and is widely distributed among different states and coasts. The total area includes 1,185-1,825 municipalities where land that is home to more than half of the current population would be affected, among them at least 21 cities exceeding 100,000 residents. Under aggressive carbon cuts, more than half of these municipalities would avoid this commitment if the West Antarctic Ice Sheet remains stable. Similarly, more than half of the US population-weighted area under threat could be spared. We provide lists of implicated cities and state populations for different emissions scenarios and with and without a certain collapse of the West Antarctic Ice Sheet. Although past anthropogenic emissions already have caused sea-level commitment that will force coastal cities to adapt, future emissions will determine which areas we can continue to occupy or may have to abandon.climate change | climate impacts | sea-level rise M ost studies on the projected impacts of anthropogenic climate change have focused on the 21st century (1). However, substantial research indicates that contemporary carbon emissions, even if stopped abruptly, will sustain or nearly sustain near-term temperature increases for millennia because of the long residence time of carbon dioxide in the atmosphere and inertia in the climate system, e.g., the slow exchange of heat between ocean and atmosphere (2-5). Earth system and carboncycle feedbacks such as the release of carbon from thawing permafrost or vegetation changes affecting terrestrial carbon storage or albedo may further extend and possibly amplify warming (6).Paleontological records indicate that global mean sea level is highly sensitive to temperature (7) and that ice sheets, the most important contributors to large-magnitude sea-level change, can respond to warming on century time scales (8), while models suggest ice sheets require millennia to approach equilibrium (9). Accordingly, sustained temperature increases from current emissions are expected to translate to long-term sea-level rise (SLR). Through modeling and with support from paleontological data, Levermann et al. (10) found a roughly linear global mean sealevel increase of 2.3 m per 1°C warming within a time-envelope of th...

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Section: Wais Collapsementioning

confidence: 99%

Carbon choices determine US cities committed to futures below sea level

Strauss

Kulp

Levermann

2015

Proc. Natl. Acad. Sci. U.S.A.

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“…In the Amundsen and Bellingshausen Seas and along the West Antarctic Peninsula, CDW delivery within canyons is both observed (Martinson and McKee, 2012;Assmann et al, 2013;Schofield et al, 2013;Wåhlin et al, 2013;Walker et al, 2013) and modeled (Thoma et al, 2008;Dinniman et al, 2011). Many studies implicate the westerlies in driving the exchange.…”

Section: How Do Acc Waters Influence Subglacial Cavities?mentioning

confidence: 99%

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

Gille¹,

McKee²,

Martinson³

2016

Oceanog.

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“…Based on RTopo-1, ocean general circulation models have successfully been used e.g. to simulate Southern Ocean warming and increased ice shelf basal melting around Antarctica (Timmermann and Hellmer, 2013;Kusahara and Hasumi, 2013), the flow of Circumpolar Deep Water onto the Amundsen Sea continental shelf (Assmann et al, 2013;Nakayama et al, 2014a), and pathways of basal meltwater from Antarctic ice shelves (Kusahara and Hasumi, 2014;Nakayama et al, 2014b). Parts of RTopo-1 were used to compile improved maps of bedrock and ice topographies for Antarctica in Bedmap2 (Fretwell et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry

Schaffer

Timmermann

Arndt

et al. 2016

Earth Syst. Sci. Data

176

200

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Abstract. The ocean plays an important role in modulating the mass balance of the polar ice sheets by interacting with the ice shelves in Antarctica and with the marine-terminating outlet glaciers in Greenland. Given that the flux of warm water onto the continental shelf and into the sub-ice cavities is steered by complex bathymetry, a detailed topography data set is an essential ingredient for models that address ice-ocean interaction. We followed the spirit of the global RTopo-1 data set and compiled consistent maps of global ocean bathymetry, upper and lower ice surface topographies, and global surface height on a spherical grid with now 30 arcsec grid spacing.

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Variability of Circumpolar Deep Water transport onto the Amundsen Sea Continental shelf through a shelf break trough

Cited by 112 publications

References 55 publications

Carbon choices determine US cities committed to futures below sea level

Carbon choices determine US cities committed to futures below sea level

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

A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry

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