We regularly provide geospatial support to scientists who are heading out into the deep field in Antarctica.
Recently, we’ve helped one particular research team plan their trip into the field, scheduled for the end of this year.
Funded by NERC, Dr Joanne Johnson is leading an international team aiming to deliver a high-resolution record of past changes in the West Antarctic Ice Sheet. Specifically, it will use glacially-transported rocks and novel isotopic measurements to study changes in the Smith, Kohler and Pope Glaciers since the peak of the last glacial period, approximately 20,000 years ago.
At present, these glaciers are amongst the most rapidly thinning and retreating of all Antarctic glaciers, and yet we hardly know anything about their history.
Johnson and her BAS colleague Dr Stephen Roberts will undertake fieldwork in extremely remote mountain ranges in Marie Byrd land. Being so remote and seldom-visited, terrestrial geographic data available for this region is sparse, and of variable quality.
Having the best possible information in advance of a field campaign is invaluable for planning the most appropriate aircraft landing sites, safe overland travel, and for prioritising sampling sites.
With the use of high resolution satellite imagery captured in stereo, we are able to produce geospatial data of the region at a scale and level of detail previously not available.
We use data from the satellite Worldview-2, which collects full colour imagery at 2m resolution, and black and white imagery at 50cm. This is powerful stuff when it comes to helping out the field teams.
Here’s a photo Jo took of Hedin Nunatak on her last trip to the field.
Compare this photo, to this georeferenced 3D visualisation created with stereo satellite imagery.
With our help, Johnson’s team will be using the same imagery, combined with outputs from smaller UAVs, to produce highly-detailed geomorphological data and maps when they return from the field. These will in turn inform interpretation of the isotopic analyses they will make on the rock samples. Together all these data will help to build a detailed picture of changes in the West Antarctic Ice sheet over the past 20,000 years across the whole Amundsen Sea Embayment.