Antarctic Climate Evolution (ACE)

Topography of the Gamburtsev mountains

2009-06-03T17:28:00.000-07:00

In the June 4 issue of Nature, Sun Bo et al., present the results of a series of radar surveys of the Gamburtsev mountains, which is generally regarded as the site of Antarctic ice-sheet inception ca. 34 Million years ago. Read the first paragraph here.

West Antarctic Ice sheet collapse and sea level rise

2009-06-03T17:11:00.000-07:00

In a recent issue of Science (15 May) Bamber et al. investigate the eustatic contribution of a rapid collapse of the West Antarctic Ice Sheet with an ice sheet model and an updated version of the subglacial topography. Read the abstract here.

New European consortium for Antarctic Drilling

2009-05-29T17:23:00.000-07:00

EuroANDRILL is a new initiative to increase participation of European countries in the ANtarctic Geological DRILLing Program. For more information visit the EuroANDRILL web address at http://www.euroandrill.com/.

Two articles in Nature on instability of the West Antarctic Ice Sheet

2009-05-29T16:55:00.000-07:00

Two articles in the March 19 issue of Nature address the stability of the West Antarctic Ice Sheet. One study by Naish et al., reports on Pliocene collapse and obliquity forcing from an ANDRILL sediment core. The other paper is a modeling study by Pollard and DeConto in which they utilize an ice-sheet model with a novel iceshelf module to reconstruct Antarctic Ice Sheet dynamics for the past 5 million years. The First paragraphs of both articles can be read here:
Naish et al.
Pollard and De Conto

Special Issue on ACE research published

2008-03-28T08:42:00.000-07:00

A Special Issue on "Antarctic cryosphere and Southern Ocean climate evolution (Cenozoic–Holocene)" has been published in Palaeogeography, Palaeoclimatology, Palaeoecology Volume 260. Editors are Fabio Florindo, Anna Nelson and Alan Haywood. The issue includes 16 papers on the palaeoenvironments and palaeoclimates around Antarctica, largely from seismic research, drilling and coring.

ANDRILL SMS has started

2007-11-04T13:28:00.000-08:00

The Antarctic geological Drilling program (ANDRILL) is currently drilling in southern McMurdo Sound (SMS) in pursuit of an ice-proximal record of the middle Miocene transition and climate optimum. The drillrig is situated on a sea ice platform. Read weekly science updates at the ANDRILL website here..

From wet-based to dry-based Antarctic glaciation at 13.94 Ma

2007-10-28T05:27:00.000-07:00

In the November issue of GSA Bulletin, Lewis et al. report on till stratigraphy constrained by Ar/Ar ages of volcanic ash from the Olympus Range in the Dry Valleys. According to the article till generated by wet-based glaciers is older than sublimation till from dry-based glaciers nearby. The ages on the ashes are used to determine the age of the transition.

Read the abstract here...

Photo: Adam Lewis

ANDRILL MIS in Geotimes

2007-10-10T15:38:00.000-07:00

An article discussing the drilling technology and preliminary scientific results of the McMurdo Ice Shelf drilling of ANDRILL can be found in the printed issue of Geotimes. Currently ANDRILL is drilling a second hole in Southern McMurdo Sound. Check http://www.andrill.org/ for science updates (from Oct. 15 approximately).

Image: www.andrill.org

Apply to sail on IODP Wilkes Land Margin

2007-10-06T14:22:00.000-07:00

Application to sail can now be submitted for the IODP expedition to the Wilkes Land Margin. The application deadline is November 30, 2007. For more information see here

Antarctic biota survived over tens of millions of years

2007-09-30T20:43:00.000-07:00

Pete Convey and Mark Stevens review evidence of survival of Antarctic biota over the past tens of millions of years, implying that ice-free refugia must have existed. These studies highlight a possible mismatch between ice-sheet modeling and terrestrial evidence. The article can be found in Science at http://www.sciencemag.org/cgi/content/summary/317/5846/1877

IODP Wilkes Land margin approved for 2009

2007-09-02T18:16:00.000-07:00

The International Polar Year 2007-2009 is enriched with another great project now that the Intergrated Ocean Drilling Program has scheduled an expedition to the Wilkes Land margin for January-March 2009.
For more details on this Leg see here

Image: Ocean Drilling Program

Northern Hemisphere forcing of the last 4 deglaciations

2007-08-24T18:46:00.000-07:00

A study of the Fuji Dome and Vostok ice cores published in Nature shows that orbital-scale Antarctic climate change lags Northern Hemisphere insolation by a few thousand years since at least 360,000 years ago. Find the first paragraph of the article here.

Eocene bi-polar glaciation and the CCD

2007-08-24T18:40:00.000-07:00

An article published in Nature by Edgar et al. discusses the link between the development of the cryosphere and the large changes in the CCD in the late Eocene. Find the link to the first paragraph here.

Microbes in 8 million year old ice from Beacon Valley

2007-08-14T10:01:00.000-07:00

A team of molecular biologists and geologists claim they have found 8 million year old microbes embedded in buried glacier ice they collected in Beacon Valley, Dry Valleys, Antarctica. Bidle and others pulished their finding in the Proceedings of the National Academy of Sciences.
For more info see news article here ...
or the full open access article here...

Image: Bidle et al., PNAS.

Antarctic circumpolar current developed in the Late Oligocene

2007-08-04T10:59:00.000-07:00

In a recent issue of the journal Geology Lyle et al. present new sediment core data suggesting that deep flow in the South Atlantic ocean started as late as the late Oligocene. The Antarctic circumpolar current was thought to have thermally isolated Antarctica in the Eocene, so that an ice sheet could develop. Recent modeling studies, however, suggested that the story is more complex. Lyle et al. explain that shallow circulation may have existed earlier than the late Oligocene as indicated by Nd isotope studies, but that deep flow with vertical mixing was established by 23-25 Ma. These findings have consequences for studies of the evolutionary biology of the region as well. For more information read the abstract here

Image: NASA

Publication started of online proceedings for the 10th ISAES 2007

2007-07-11T17:51:00.000-07:00

The 10th International Symposium on Antarctic Earth Sciences has freely accessible online proceedings. Publication has started and will continue until the start of the symposium 26 August-31 August 2007 in Santa Barbara. Two types of contributions are available: 4-5 page peer-reviewed Short Research Papers and Extended Abstracts (not peer-reviewed). Click here to connect to the online proceedings.

Photo: Sandra Passchier, courtesy National Science Foundation

West Antarctic Ice Sheet existed more than 25 million years ago

2007-07-04T16:57:00.000-07:00

A recent article in the journal Geology by Sorlien et al., reports on interpretations of seismic data that indicate that ice was draining into the eastern Ross Sea from Mary Byrd Land as early as the Oligocene.

For more information see the press release here or read the abstract here.

Photo: Bruce Luyendyk

New-Generation Polar Research Symposium

2007-06-11T18:20:00.000-07:00

The New-Generation Polar Research Symposium will be held May 4-11, 2008at La Foret Conference Center in Colorado Springs, CO. For more information visit the conference website at: http://ccar.colorado.edu/ngpr/

Antarctic glaciers accelerate as climate warms

2007-06-09T10:42:00.000-07:00

Satellite data indicates that hundreds of glaciers on the Antarctic Peninsula are flowing faster than expected. Faster ice drainage leads to sea level rise, a major concern for low-lying coastal areas elsewhere. Authors Pritchard and Vaughan published an article on this topic in the Journal of Geophysical Research last week. More in:
Press Release British Antarctic Survey

BBC NEWS

Photo: British Antarctic Survey

Scientists prepare for 2007 ANDRILL season

2007-06-09T09:27:00.000-07:00

After a successful drilling season in 2006, preparations for the upcoming season of the Antarctic Drilling Program (ANDRILL) are underway. In Fall 2007 ANDRILL plans to drill a deep hole through sedimentary strata in southern McMurdo Sound. On-ice scientists from the United States, New Zealand, Italy and Germany currently go through extensive medical and dental exams. McMurdo station, where most scientists will be stationed, has limited medical facilities. More about ANDRILL..

Photo: Sandra Passchier, courtesy NSF

Geologists complete second field season on James Ross Island

2007-05-20T14:19:00.000-07:00

From January until March 2007 british geologists were carrying out field work in their second field season on James Ross Island near the Antarctic Peninsula. Their objective was to study sedimentary rocks from the Neogene period (between 2 and 24 million years old). These rocks originated during a time when climatic conditions were similar to those projected for the future. More at Visit and Learn... or in an article on their previous field season in Geology Today...

Photo: British Antarctic Survey

Antarctic Climate Evolution research in Nature

2007-03-30T16:07:00.000-07:00

At the start of the International Polar Year 2007-08, two news reports in Nature of March 7th highlighted Antarctic drilling activities. One article discusses the results of the Antarctic Drilling Program (ANDRILL), that penetrated more than 1200 m into the layers of the seabed, extracting a geological archive extending more than 5 millions years back in time. The second article is an account of the preparations for ice coring into the East Antarctic ice sheet at Dome Argus. The latter project aims to acquire a detailed climate record from annual layers of ice over the past 1.5 million years. More at http://www.nature.com/news/2007/070305/full/446110a.html

Photo: Sandra Passchier, courtesy NSF