ICESat-2 Ground Track

Data visualization featuring precise map of Mercer and Conway subglacial lakes in West Antarctica. The visualization sequence starts with a view of the Americas and slowly zooms into the suture between the Mercer and Whillans ice streams. Surface-height anomaly data from NASA's ICESat-2 mission provide critical insight for the drain-fill cycles of subglacial lakes and aid in the discovery of two new water bodies within the same region. This data-driven visualization includes labels of ice formations close to the area of interest and repeats playback of the segment of the subglacial lakes surface-height anomalies. Data visualization sequence of surface-height anomaly data from NASA's ICESat-2 mission for Conway and Mercer subglacial lakes. This sequence includes colorbar, timestamp, scale bar and lake outlines. Data visualization featuring Mercer and Conway subglacial lakes in West Antarctica. The visualization sequence starts with a view of the Americas and slowly zooms into the suture between the Mercer and Whillans ice streams. Surface-height anomaly data from NASA's ICESat-2 mission provide critical insight for the drain-fill cycles of subglacial lakes and aid in the discovery of two new water bodies within the same region. This data-driven visualization sequence includes labels of ice formations close to the area of interest. Data visualization sequence of surface-height anomaly data from NASA's ICESat-2 mission for Conway and Mercer subglacial lakes. This sequence includes colorbar, timestamp, scale bar information. This set of frames provides the subglacial lakes data overlay geo-registered on top of the New Landsat Image Mosaic of Antarctica (LIMA). Frames are provided in 4K and HD resolution. This set of frames provides the data layer of the subglacial lakes visualization sequence. Frames are provided with transparency in 4K and HD resolutions. Outlines of Lake Conway (left) and Lake Mercer (right). This still image is provided with transparency. Scale bar provided in 4K and HD resolutions. This set of frames provides the timestamp overlay of the subglacial lakes data visualization sequence. Frames are provided with transparency in 4K rersolution. Still image of colorbar layer for the subglacial lakes data visualization sequence. The still image is provided with transparency in 4K resolution. Colorbar (with annotations) of subglacial lake surface-height anomalies. Colorbar created for the subglacial lakes data. Brown-white-blue divergent colorbar to separate the subglacial lake height anomalies above (orange/low to brown/high) and below (light blue/shallow to dark blue/deep) surface. The colorbar is applied to the study area of Lake Conway and Lake Mercer. NASA’s Ice, Cloud and land Elevation Satellite 2, or ICESat-2 dense laser altimetry data allowed scientists for the first-time to precisely map subglacial lakes in Antarctica. NASA’s ICESat-2 measures the height of the ice surface, which, despite its enormous thickness, rises or falls as lakes fill or empty under the ice sheet. In the study, titled Illuminating Active Subglacial Lake Processes With ICESat-2 Laser Altimetry, published in Geophysical Research Letters, researchers Matthew Siegfried et al. integrated height data from NASA’s ICESat-2 mission, its predecessor ICESat, as well as from CryosSat-2 from the European Space Agency. The published findings provide critical insight for spotting new subglacial lakes from space and a better understanding of their drain and fill cycles. Furthermore, the findings increase our knowledge on how outlines or boundaries of lakes change gradually as water enters and leaves the reservoirs.The data visualization sequence starts with a view of the Americas from space and slowly zooms into the continent of Antarctica. During the gradual zoom labels indicate ice formations of high relevance in West Antarctica, such as Ross Ice Shelf, Siple Coast, Mercer Ice Stream, Whillans Ice Stream and finally Conway Subglacial Lake and Mercer Subglacial Lake. The Conway and Mercer subglacial lakes are located near the suture between Mercer and Whillans ice streams – one of the most studied active subglacial regions in Antarctica. After the final zoom stage surface-height anomaly data reveal changes in the study area of Lake Conway and Lake Mercer for the period of September 2018-June 2020.The data sequence shows the connected fill-drain cycle of Conway and Mercer subglacial lakes. For example by May 2019, we can see how water drained from Lake Conway to Lake Mercer, where the area within the outlines of Conway subglacial lake is mostly brown-ish and the area within the outlines of Mercer subglacial lake is mostly blue-ish. In addition, we can see that by January 2020 the opposite shift has occurred, where water from Lake Mercer drained to Lake Conway. During the sequence, we can also detect the formation of two new smaller lakes, adjacent to the Conway and Mercer subglacial lakes. These two new lakes are called: Lower Conway Subglacial Lake, which is located between Lake Conway and Lake Mercer and Lower Mercer Subglacial Lake, which is located south of Mercer subglacial lake. The data visualization content featured on this page contains distinct versions for 4K and HD resolutions. Please select the appropriate version for the native resolution of your screen.Data Sources: Conway Subglacial Lake and Mercer Subglacial Lake Spatial Height Anomalies for the period 09/2018-05/2020, derived from the ATLAS/ICESat-2 L3A Land Ice Height V003 data set. This data set (ATL06) provides geolocated, land-ice surface heights (above the WGS 84 ellipsoid, ITRF2014 reference frame), plus ancillary parameters that can be used to interpret and assess the quality of the height estimates. The data were acquired by the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Elevation Satellite-2 (ICESat-2) observatory.Citation: ATLAS/ICESat-2 L3A Land Ice Height V003. Version 003. Archived by National Aeronautics and Space Administration, U.S. Government, NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/ATLAS/ATL06.003 [Date Accessed: July 14, 2021] Matthew R. Siegfried. (2021, June 8). mrsiegfried/Siegfried2021-GRL: Initial release with acceptance (Version 1.0). Zenodo. doi: https://doi.org/10.5281/zenodo.4914107Outlines of Conway and Mercer subglacial lakes, derived by ICESat mission. The outlines were provided by the science team and are available here: https://github.com/mrsiegfried/Siegfried2021-GRL/tree/main/data/outlines [Date Accessed: July 27, 2021]New Landsat Image Mosaic of Antarctica (LIMA) Product, Center-Filled LIMA, complete contintent created by the Landsat Image Mosaic of Antarctica (LIMA) Project. The Center-Filled LIMA product is a seamless and virtually cloudless mosaic created from processed Landsat 7 ETM+ scenes. In areas where Landsat had no coverage imagery from the Moderate Resolution Imaging Spectroradiometer (MODIS) Mosaic of Antarctica (MOA) was used. The visualizations featured on this page utilize the New LIMA product as the Antarctica texture throughout the sequences. doi: https://doi.org/10.5066/P9TEIU3HThe dataset is available at: https://lima.usgs.gov [Date Accessed: June 14, 2021].Citation: Bindschadler, R., Vornberger, P., Fleming, A., Fox, A., Mullins, J., Binnie, D., Paulson, S., Granneman, B., and Gorodetzky, D., 2008, The Landsat Image Mosaic of Antarctica, Remote Sensing of Environment, 112, pp. 4214-4226. doi: https://doi.org/10.1016/j.rse.2008.07.006Blue Marble: Next Generation was produced by Reto Stöckli, NASA Earth Observatory (NASA Goddard Space Flight Center). Citation: Reto Stöckli, Eric Vermote, Nazmi Saleous, Robert Simmon and David Herring. The Blue Marble Next Generation – A true color earth dataset including seasonal dynamics from MODIS, October 17, 2005. The visualizations on this page utilize Blue Marble data to map the water and land bodies around the globe. The rest of this webpage offers additional versions, frames, layers and colorbar information, associated with the development of this data-driven visualization. For More InformationSee [https://www.nasa.gov/feature/goddard/2021/nasa-space-lasers-map-meltwater-lakes-in-antarctica-with-striking-precision/](https://www.nasa.gov/feature/goddard/2021/nasa-space-lasers-map-meltwater-lakes-in-antarctica-with-striking-precision/) Related pages