NASA IceBridge

NASA IceBridge
Name	NASA IceBridge
Established	2009
Agency	National Aeronautics and Space Administration
Headquarters	Ames Research Center
Program	Earth Science Division

NASA IceBridge

NASA IceBridge was a multi-year airborne scientific campaign led by the National Aeronautics and Space Administration to bridge observational gaps between the Ice, Cloud, and land Elevation Satellite missions by collecting airborne remote sensing data over the Arctic, the Antarctic, and polar ice shelves. The campaign combined aircraft platforms, geophysical instruments, and field teams drawn from institutions such as NASA Goddard Space Flight Center, NASA Langley Research Center, University of Colorado Boulder, University of Washington, and international partners including the British Antarctic Survey and Alfred Wegener Institute. It provided high-resolution continuity between the ICESat and ICESat-2 satellite missions while informing programs such as Operation IceBridge's users in the Scientific Committee on Antarctic Research community.

Overview

IceBridge began in 2009 as an airborne bridging project to monitor changes in polar ice mass, ice thickness, and glacial dynamics during the gap between the ICESat decommissioning and the launch of ICESat-2. The program coordinated flights from bases including Kangerlussuaq Airport, Thule Air Base, McMurdo Station, and Punta Arenas using aircraft like the NASA P-3 Orion and NASA DC-8 to map features such as the Greenland Ice Sheet, West Antarctic Ice Sheet, and ice shelves like the Pine Island Glacier and Thwaites Glacier. IceBridge worked alongside satellite programs including Landsat, Sentinel-1, CryoSat-2, and the Soil Moisture Active Passive (SMAP) mission to cross-validate observations and support models such as those used by the Intergovernmental Panel on Climate Change.

Mission and Objectives

Primary objectives included measuring ice-sheet elevation change, mapping glacier thickness, monitoring sea-ice freeboard, and characterizing snow cover and bedrock topography to improve mass-balance estimates for Greenland and Antarctica. IceBridge aimed to fill temporal and spatial gaps for ICESat-2, support calibration and validation for CryoSat-2 and Sentinel-3, and supply datasets for cryosphere modeling groups at institutions like Columbia University's Lamont–Doherty Earth Observatory, Massachusetts Institute of Technology's Jet Propulsion Laboratory collaborations, and the National Snow and Ice Data Center. The campaign also supported field campaigns such as Operation Deep Freeze and contributed to assessments by agencies including the National Science Foundation.

Instruments and Aircraft

The campaign deployed instrument suites including airborne lidar altimeters, radar sounders, gravimeters, imaging cameras, and laser scanners installed on platforms such as the NASA P-3 Orion, NASA DC-8, Basler BT-67, and smaller observational aircraft from partners like the United States Antarctic Program. Key instruments included the Airborne Topographic Mapper (ATM), the University of Kansas snow radar, the Center for Remote Sensing of Ice Sheets (CReSIS) multi-frequency radar, the University of Texas gravimeter, and high-resolution optical sensors comparable to those on Landsat and WorldView series satellites. Instrument teams came from organizations like Byrd Polar and Climate Research Center, British Antarctic Survey, and Caltech to integrate systems for campaigns supporting missions such as ICESat and ICESat-2 calibration.

Operations and Methodology

IceBridge conducted seasonal flight campaigns timed to polar seasons, operating from logistics hubs including Svalbard, Longyearbyen, Thule Air Base, Scott Base, and regional airports near Patagonia. Flight lines were designed to coincide with satellite ground tracks from ICESat and ICESat-2 as well as radar passes from CryoSat-2 and Sentinel-1 to enable cross-comparison. Methodologies combined airborne lidar transects, radar sounding for internal layering and bed detection, photogrammetry, and gravimetry to derive ice thickness, surface elevation, and basal topography used by modeling teams at Princeton University and University of Cambridge. Operations required coordination with civil aviation authorities and logistics partners such as Polar Air Cargo and national research programs like the Norwegian Polar Institute.

Major Findings and Contributions

IceBridge documented accelerating thinning on outlet glaciers including Jakobshavn Glacier and dynamic retreat at ice shelves such as Pine Island Glacier and Thwaites Glacier, refining mass-loss estimates for Greenland and West Antarctica used in IPCC assessments. The campaign revealed complex basal topography beneath ice streams, identified channels and crevassing patterns in sea ice, and improved estimates of snow accumulation and density crucial to converting altimetry to mass change used by researchers at University of Bristol and University of Alberta. Data supported studies linking warming ocean waters near the Amundsen Sea and Bellingshausen Sea to enhanced ice-shelf melting and contributed to hazard assessments for coastal cities like New York City and Miami in long-term sea-level projections.

Data Management and Accessibility

IceBridge implemented standardized data products, metadata schemas, and quality-control protocols to archive airborne lidar, radar, and imagery with organizations such as the National Snow and Ice Data Center and NASA Distributed Active Archive Centers. Datasets were made available for use by academic groups at University of Oxford, ETH Zurich, and University of Melbourne, as well as operational users from agencies like the National Oceanic and Atmospheric Administration and United States Geological Survey. The program emphasized open data policies, facilitating cross-disciplinary research linking IceBridge records with satellite archives from Landsat and Sentinel missions.

Collaborations and Funding

IceBridge was funded and supported by the NASA Earth Science Division with collaboration from international partners including the European Space Agency, British Antarctic Survey, Alfred Wegener Institute, and national programs such as the National Science Foundation's United States Antarctic Program. Academic partners included University of Colorado Boulder, University of Washington, Columbia University, University of Texas, and University of Kansas, while instrument development involved organizations like Caltech and CReSIS. Collaborative frameworks linked IceBridge to global initiatives such as the World Climate Research Programme and the Scientific Committee on Antarctic Research.

Legacy and Successor Programs

IceBridge provided critical continuity between satellite missions and established methods, instrument suites, and community datasets that informed successor efforts like expanded calibration and validation for ICESat-2, joint campaigns with CryoSat-2, and integrated observing systems promoted by the Global Climate Observing System. Legacy products continue to support ice-sheet modeling groups at Massachusetts Institute of Technology, Princeton University, and University of Cambridge and underpin long-term monitoring programs that guide assessments by the Intergovernmental Panel on Climate Change and national polar research agendas.

Category:NASA programs Category:Cryosphere research Category:Polar research