Joint PAIS-PRAMSO-AISSL Meeting at 13th ISAES, 20 – 21 July 2019

Joint PAIS-PRAMSO-AISSL Meeting at 13th ISAES, 20 – 21 July 2019

Venue: Room 305, 3F Songdo Convensia (see attached map). We invite you to attend a two-day PAIS-PRAMSO-AISSL workshop at ISAES. During the first day (July20) we will update the community on PAIS activ...

Check the new JOIDES Resolution schedule

on 25 March 2019
Check the new JOIDES Resolution schedule

Click the Joides Resolution schedule After the successful Ross Sea expedition in early 2018 https://iodp.tamu.edu/scienceops/expeditions/ross_sea_ice_sheet_history.html the Amundsen Sea expeditio...

The March issue of Oceanography

on 20 March 2019
The March issue of Oceanography

The March issue of Oceanography https://tos.org/oceanography/issue/volume-32-issue-01 is  a special issue on Scientific Ocean Drilling. Under the Theme 1. Climate and Ocean Change, you...

EU-PolarNet White Papers release

EU-PolarNet White Papers release

EU-PolarNet White Papers release https://www.eu-polarnet.eu/news-and-events/conferences-and-workshops/white-paper-workshop/ White Paper No. 1: The coupled polar climate system: global context, pr...

PhD in Polar Science and PhD in Science and Management of Climate Change

on 12 March 2019
PhD in Polar Science and PhD in Science and Management of Climate Change

PhD in Polar Science and PhD in Science and Management of Climate Change call for application. University of Venice (Italy).  http://www.unive.it/phd-degrees    applicati...

PAIS-IODP Antarctic School

on 07 February 2019
PAIS-IODP Antarctic School

Dates: 10–14 June 2019 Location: IODP Gulf Coast Repository, Texas A&M University, College Station, Texas, USA Deadline to apply: 27 February 2019 Website: https://usoceandiscovery.org/antar...

ECORD PROCEED Workshop

ECORD PROCEED Workshop

ECORD PROCEED Workshop - http://www.ecord.org/science/proceed/. The workshop will be held in Vienna on 6-7 April, just before the EGU 2019.  Registration is due by Februa...

ISAES 2019

on 23 January 2019
ISAES 2019

The XIII International Symposium on Antarctic Earth Science https://www.isaes2019.org:12090/home/ abstract submission deadline is 27 April 2019   Abstract submission for the XIII Intern...

Travel grants available

on 23 January 2019
Travel grants available

Submit here your travel grant request to attend conferences, workshops and schools related to PAIS

DRILLING FOR PAST ANTARCTIC CLIMATE - THEN AND NOW

on 14 June 2018
DRILLING FOR PAST ANTARCTIC CLIMATE - THEN AND NOW

  This collection of videos captures talks on this topic on the evening of 8 March, 2018, at the Lyttelton Arts Factory, New Zealand, after the return of the JOIDES Resolution from IODP...

CELEBRATING 60 YEARS OF ANTARCTIC SCIENTIFIC RESEARCH AND 50 YEARS OF SCIENTIFIC OCEAN DRILLING

on 06 February 2018
CELEBRATING 60 YEARS OF ANTARCTIC SCIENTIFIC RESEARCH AND 50 YEARS OF SCIENTIFIC OCEAN DRILLING

Guest post by co-chief scientist Laura De Santis from Instituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS): This year the Scientific Committee on Antarctic Research (SCAR) and&n...

SCAR PAIS obituary for Gene Domack

on 06 December 2017
SCAR PAIS obituary for Gene Domack

Dr. Eugene Domack, Professor of Geological Oceanography at the University of South Florida College of Marine Science, died on Nov. 20, 2017 after a brief illness. Gene earned his Ph.D. in Geology from...

Katabatic winds diminish precipitation contribution to the Antarctic ice mass balance

on 13 October 2017
Katabatic winds diminish precipitation contribution to the Antarctic ice mass balance

A new field work study evaluates how katabatic winds can reduce the amount of precipitation actually reaching the surface. PNAS from Grazioli et al, 2017 Accumulation of precipitation is the principal...

East Antarctic ice sheet most vulnerable to Weddell Sea warming (Golledge et al., 2017)

East Antarctic ice sheet most vulnerable to Weddell Sea warming (Golledge et al., 2017)

The Recovery drainage basin in the eastern Weddell Sea will more likely be the first contributor of future ice loss from EAIS due to ocean warming. Geophysical Research Letters by Golledge et al. Anta...

Sabrina seafloor survey

Sabrina seafloor survey

https://sites.google.com/site/sabrinaseafloorsurvey This site follows the voyage of Australian, Italian, Spanish and American scientists on Australia's research vessel Investigator. Our voyage departs...

Obliquity-paced climate change recorded in Antarctic debris-covered glaciers

Obliquity-paced climate change recorded in Antarctic debris-covered glaciers

Some high-latitude glaciers are found to remain sensitive to 41 000 years obliquity variations despite a global climate paced at roughly 100 000 years. Nature communications by Mackay and Marchant. Th...

Mission report : Evaluation of the warm marine air intrusion at the French Antarctic station Dumont d’Urville using water stable isotopes as an atmospheric tracer

Mission report : Evaluation of the warm marine air intrusion at the French Antarctic station Dumont d’Urville using water stable isotopes as an atmospheric tracer

The first results of water vapour monitoring at the coastal station Dumont d'Urville will help to link the isotopes records from ice cores to the ice-ocean-atmosphere interactions. During the austral...

Antarctic last interglacial isotope peak in response to sea ice retreat, not ice-sheet collapse

Antarctic last interglacial isotope peak in response to sea ice retreat, not ice-sheet collapse

Models evaluate the impact of the collapse of the West Antarctic ice sheet and of sea ice reduction on the isotopic composition of precipitation on the East Antarctic Plateau, compared to isotopic rec...

Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination

Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination

A new ice core record provides clues on the evolution of the ice sheet in the Wedell sea during the last glacial termination which could improve the understanding of the ice-ocean-atmosphere feedback...

IODP Antarctic expeditions 2018-20

IODP Antarctic expeditions 2018-20

We want to make you aware of upcoming opportunities for Antarctic research with the International Ocean Discovery Program (IODP). Two expeditions are scheduled for the 2017–2019 Antarc...

Blogs and weekly reports of the upcoming Polarstern cruise (with MeBo)

 Blogs and weekly reports of the upcoming Polarstern cruise (with MeBo)

Blogs and weekly reports of the upcoming Polarstern cruise (with MeBo) The Research Vessel Polarstern is the most important resource for German polar research and the flagship of the Alfred Wegener In...

PAIS provides funding for 1-2 students

on 13 January 2017
PAIS provides funding for 1-2 students

PAIS provides funding for 1-2 students to attend the Urbino Summer School in Paleoclimate: http://www.uniurb.it/ussp/ or other schools related to PAIS. Interested persons should contact Laur...

The Recovery drainage basin in the eastern Weddell Sea will more likely be the first contributor of future ice loss from EAIS due to ocean warming.

Geophysical Research Letters by Golledge et al.

Antarctica is an important contributor to sea level rise; hence, it is critical to estimate the response of the ice sheet to oceanic and atmospheric warming. If emissions of greenhouse gases continue unchanged, Antarctic ice sheets have the potential to contribute between 0.4 - 0.8 m of sea-level rise by 2100 and more than 10-15 m by 2500 (Golledge et al., 2015; De Conto and Pollard, 2016). In this study, Nick Golledge and his team used a three-dimensional ice-sheet model to simulate the response of the ice (sheet, stream and shelf) flow across the Antarctic continent, which enables spatially-variable ice sheet responses to be compared with each other. Because considerable uncertainty remains in projections of future ice loss from East Antarctic Ice Sheet (EAIS) due to its complex estimation, the main objective of the group was to describe and simulate the responses and mass loss patterns of three East Antarctic drainage basins, or catchments. Due to its implications for coastal cities around the world, reducing the uncertainty of ice loss and hence sea level projections is a social priority.

The climatology simulations run in this study show: (i) the dependency of both East and West Antarctic ice sheets on environmental conditions; (ii) the linear increase of ice loss with increasing oceanic and atmospheric temperatures at a continental scale; (iii) the different sectoral behaviors  between WAIS and EAIS catchments, the former showing an abrupt sensitivity to ocean temperatures; (iv) the delicate threshold for stability of WAIS that with an ocean warming of only 0.5°C applied over many millennia can lead to the loss of the most of the marine-based ice in this sector; and (v) Recovery drainage basin as the more sensitive catchment to ocean warming and the likely major contributor of ice loss from EAIS. This study discusses the implications of the future freshwater fluxes from ice melt of the Recovery drainage basin, which can significantly disrupt the Antarctic bottom water (AABW) formation. Previous simulations from the same group have shown that this mechanism could trigger a positive feedback that accelerates the grounding retreat (Golledge et al., 2014) and has global climatic consequences (Bakker et al., 2016).

golledge etal2017 GRL 

Figure 1. Sea level response pattern for five of the largest Antarctic catchments and continent for sea-water and air temperature combination (a) Continent-wide sea-level contributions after 10,000 model years. (b–f) Sea-level contributions from five discrete drainage basins, showing considerable differences in environmental sensitivity and nature of threshold response under warmer-than-present air (T) and ocean (SST) temperatures. The Pine Island Glacier (PIG)/Thwaites Glacier and Siple Coast catchments of West Antarctica (Figures 1b and 1c) exhibit high sensitivity to relatively modest warming values; Wilkes (Figure 1d) and Aurora (Figure 1e) catchments exhibit a threshold sensitivity to air temperature, but not ocean temperature; Recovery basin (Figure 1f) exhibits an abrupt response to ocean temperature but is less sensitive to air temperature.

Bakker, P., P. U. Clark, N. R. Golledge, A. Schmittner, and M. E. Weber (2016), Centennial-scale Holocene climate variations amplified by Antarctic ice sheet discharge, Nature, 541, 72–76, doi:10.1038/nature20582.

DeConto, R., and D. Pollard (2016), Contribution of Antarctica to past and future sea-level rise, Nature, 531, 591–597.

Golledge, N., L. Menviel, L. Carter, C. Fogwill, M. England, G. Cortese, and R. Levy (2014), Antarctic contribution to meltwater pulse 1A from reduced Southern Ocean overturning, Nat. Commun., 5, 1–10, doi:10.1038/ncomms6107.

Golledge, N., D. Kowalewski, T. Naish, R. Levy, C. Fogwill, and E. Gasson (2015), The multi-millennial Antarctic commitment to future sea-level rise, Nature, 526, 421–425.

Golledge, N. R., R. H. Levy, R. M. McKay, and T. R. Naish (2017), East Antarctic ice sheet most vulnerable to Weddell Sea warming, Geophys. Res. Lett., 44, doi:10.1002/2016GL072422.

Full article at: http://onlinelibrary.wiley.com/doi/10.1002/2016GL072422/full

EOS spotlight article: https://eos.org/research-spotlights/what-regions-are-most-at-risk-for-ice-loss-in-east-antarctica

PS

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