WAIS Divide

WAIS Divide. A deep-field scientific research site located on the West Antarctic Ice Sheet, renowned for producing one of the highest-resolution climate records from an ice core. Established as a major project of the United States Antarctic Program, the site was selected for its unique glaciological characteristics that allow for the precise dating of atmospheric gases trapped in the ice. Research conducted here has fundamentally advanced understanding of past interactions between greenhouse gas concentrations and Antarctic climate.

Location and Discovery

The site is situated on a nearly flat, slow-moving section of the West Antarctic Ice Sheet, approximately 1,766 meters above sea level and about 1,000 kilometers from the coastal station of McMurdo Station. Its location was identified through extensive airborne radar surveys conducted by organizations like the University of Texas Institute for Geophysics, which mapped internal ice layers. This area was chosen because the ice stratigraphy is exceptionally undisturbed, with minimal horizontal flow distorting the annual layers. The discovery of this optimal drill site was a collaborative effort involving glaciologists from the University of Washington and the California Institute of Technology.

Scientific Significance

The primary significance of WAIS Divide lies in its ability to resolve climatic changes with exceptional temporal detail, capturing events that are blurred in other Antarctic cores like those from Vostok Station or Dome C. The ice provides a Southern Hemisphere counterpart to detailed records from Greenland, such as the Greenland Ice Core Project. It is particularly valuable for studying the timing of changes in atmospheric methane and carbon dioxide relative to temperature shifts during events like the last glacial termination. This has directly tested hypotheses about the global connections during abrupt climate changes documented in the North Atlantic Ocean.

Ice Core Drilling Project

The WAIS Divide Ice Core Drilling Project successfully retrieved a core reaching a depth of 3,405 meters, recovering ice over 68,000 years old. The drilling utilized an advanced Deep Ice Sheet Coring drill developed with engineering support from the University of Wisconsin–Madison. Core processing and analysis were centralized at the National Ice Core Laboratory in Denver, Colorado. A landmark achievement was the development of an ultra-precise chronology, the WD2014 timescale, which allows the alignment of this Antarctic record with other paleoclimate archives from places like the Byrd Station and Siple Dome.

Climate and Environmental Research

Research on the core has yielded transformative insights into the Earth's climate system. Studies have precisely quantified the lead-lag relationships between Antarctic temperature and greenhouse gases, challenging previous models. It has provided a detailed history of atmospheric dust flux, which is linked to changes in Patagonia and other Southern Hemisphere dust sources. Analyses of chemical tracers have reconstructed past behavior of the Southern Hemisphere westerlies and sea ice extent in the Ross Sea. The core also serves as a baseline for studying modern anthropogenic impacts on the atmosphere.

Logistics and Operations

Supporting the remote project required a massive logistical effort coordinated by the National Science Foundation through its contractor, Leidos. Seasonal operations relied on ski-equipped LC-130 Hercules aircraft flown by the New York Air National Guard for personnel and cargo transport. Scientists and support staff lived in a temporary field camp with modular structures designed to withstand the extreme polar environment. All waste was meticulously managed and removed in accordance with the Protocol on Environmental Protection to the Antarctic Treaty, ensuring minimal environmental footprint on the pristine ice sheet.

Category:Antarctic research stations Category:Climate change assessment and attribution Category:Ice cores