A5052811824- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Oceanographic and Atmospheric Processes
- Environmental and Cultural Studies in Latin America and Beyond
- Advanced Optical Sensing Technologies
- Land Use and Ecosystem Services
- Arctic and Russian Policy Studies
- Winter Sports Injuries and Performance
- Calibration and Measurement Techniques
- Solid-state spectroscopy and crystallography
- Scientific Research and Discoveries
- Polar Research and Ecology
- Climate Change Policy and Economics
- Carbon Dioxide Capture Technologies
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- Icing and De-icing Technologies
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- CO2 Sequestration and Geologic Interactions
- Remote Sensing in Agriculture
- Indigenous Studies and Ecology
Adnet Systems (United States)
2010-2023
Goddard Space Flight Center
2011-2021
Science Systems and Applications (United States)
2002-2013
Satellite observations of surface reflected solar radiation contain information about variability in the absorption by vegetation. Understanding causes is important for models that use these data to drive land fluxes or benchmarking prognostic vegetation models. Here we evaluated interannual new 30.5-year long global satellite-derived reflectance index data, Global Inventory Modeling and Mapping Studies normalized difference (GIMMS NDVI3g). Pearson’s correlation multiple linear stepwise...
Abstract We present the first winter season of surface height and sea ice freeboards Arctic Ocean from new Ice, Cloud, Land Elevation Satellite (ICESat‐2; IS‐2) mission. The Advanced Topographic Laser Altimeter System onboard has six photon‐counting beams for profiling with a 10‐kHz pulse rate (interpulse distance ~0.7 m) footprints ~17 m. Geolocated heights assigned to individual photons scattered allow significant flexibility in construction distributions used finding. For IS‐2 products,...
An intercalibration between F13 Special Sensor Microwave Imager (SSMI) and F17 Sounder (SSMIS) sea ice extents areas for a full year of overlap is undertaken preparatory to extending the 1979-2007 National Aeronautics Space Administration (NASA) Goddard Flight Center NASA Team algorithm time series global areas. The was created from Scanning Multichannel Radiometer (SMMR) SSMI data. After intercalibration, yearly mean difference in northern hemisphere (NH) - 0.0156%, with standard deviation...
Abstract. Contemporary climate warming over the Arctic is accelerating mass loss from Greenland Ice Sheet through increasing surface melt, emphasizing need to closely monitor its balance in order improve sea-level rise predictions. Snow accumulation largest component of ice sheet's balance, but situ observations thereof are inherently sparse and models difficult evaluate at large scales. Here, we quantify recent rates using ultra-wideband (2–6.5 GHz) airborne snow radar data collected as...
Abstract. Since 2009, the ultra-wideband snow radar on Operation IceBridge (OIB; a NASA airborne mission to survey polar ice covers) has acquired data in annual campaigns conducted during Arctic and Antarctic springs. Progressive improvements hardware processing methodologies have led improved quality for subsequent retrieval of depth. Existing algorithms differ way air–snow (a–s) snow–ice (s–i) interfaces are detected localized returns how system limitations addressed (e.g., noise,...
An assessment of Advanced Microwave Scanning Radiometer Earth Observing System (AMSR-E) sea ice concentrations under winter conditions using derived from Landsat-7 Enhanced Thematic Mapper Plus (ETM+) imagery obtained during the March 2003 Arctic validation field campaign is presented. The National Oceanic and Atmospheric Administration Environmental Technology Laboratory's Airborne Polarimetric Measurements, which were made Aeronautics Space P 3B aircraft campaign, used primarily as a...
Abstract. In Release 001 and 002 of the ICESat-2 sea ice products, candidate height segments used to estimate reference surface for freeboard calculations included two types: specular smooth dark leads. We found that uncorrected photon rates, as proxies reflectance, are attenuated due clouds resulting in potential misclassification leads, biasing relative those derived from more reliable returns. This results higher heights lower estimated freeboards. The resolution available cloud flags...
A comparison of snow depths on sea ice was made using airborne altimeters and an Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) simulator. The data were collected during March 2006 National Aeronautics Space Administration (NASA) Arctic field campaign utilizing NASA P-3B aircraft. consisted initial series coordinated surface aircraft measurements over Elson Lagoon, Alaska adjacent seas followed by a large-scale (100 km × 50 km) AMSR-E depth portions Chukchi...
An assessment of the standard Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E) sea-ice concentrations Antarctic winter is made from a comparison nearly 40 000 AMSR-E concentration values with geolocated derived ten Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) scenes acquired on October 1st and 2nd 2005 2006. The products are produced using National Aeronautics Space Administration Team 2 algorithm. MODIS cover portions almost all regions surrounding...
Abstract During spring and summer, the surface of Arctic sea-ice cover undergoes rapid changes that greatly affect albedo significantly impact further decay sea ice. These are primarily development a wet snow melt ponds. As ponds generally do not exceed couple meters in diameter, spatial resolutions sensors like Advanced Very High Resolution Radiometer Moderate Imaging Spectroradiometer too coarse for their identification. Landsat 7, on other hand, has resolution 30 m (15 panchromatic band)...
Satellite microwave radiometers are widely used to estimate sea ice cover properties (concentration, extent, and area) through the use of concentration (IC) algorithms. Rare algorithms providing associated IC uncertainty estimates. Algorithm estimates needed assess accurately global regional trends in (and thus extent area), improve predictions on seasonal interannual timescales using data assimilation approaches. This paper presents a method provide relative enhanced NASA Team (NT2)...
Abstract. Contemporary climate warming over the Arctic is accelerating mass loss from Greenland Ice Sheet (GrIS) through increasing surface melt, emphasizing need to closely monitor balance (SMB) in order improve sea-level rise predictions. Here, we quantify accumulation rates, largest component of GrIS SMB, at a higher spatial resolution than currently available, using Snow Radar stratigraphy. We use semi-automated method derive annual-net rates airborne data collected by NASA's Operation...
NASA's ICESat-2 mission launched in September 2018 carrying a single instrument, the Advanced Topographic Laser Altimeter System (ATLAS). ATLAS uses high-repetition-rate, low-pulse-energy laser with its output split into six beams and photon-counting receiver to measure Earth surface elevation centimeter-level precision, repeating ground track every 91 days. During more than four years of on-orbit operation, has met or exceeded lifetime performance requirements. We present measurements,...
The melting of sea ice is correlated to increases in surface temperature and associated climatic changes. Therefore, it important investigate how rapidly floes melt. For this purpose, a new TempoSeg method for multitemporal segmentation multiyear proposed. microwave radiometer used track the position an floe. Then, time series MODIS images are created with floe image center. A performed segment these into two regions: Floe Background. First, morphological feature extraction applied. central...
Abstract. In Release 1 and 2 of the ICESat-2 sea ice products, candidate height segments used to estimate reference surface for freeboard calculations included two types: specular smooth dark leads. We found that uncorrected photon rates, as proxies reflectance, are attenuated due clouds resulting in potential misclassification leads, biasing relative those derived from more reliable returns. This results higher heights lowering estimated freeboards. Resolution available cloud flags...
Abstract. Since 2009, the ultra-wideband snow-radar on Operation IceBridge has acquired data in annual campaigns conducted during Arctic and Antarctic springs. Progressive improvements radar hardware processing methodologies have led to improved quality for subsequent retrieval of snow depth. Existing algorithms differ way air-snow snow-ice interfaces are detected localized returns, how system limitations addressed (e.g., noise, resolution). In 2014, Snow Thickness On Sea Ice Working Group...
<p>Terrestrial and aerial image analysis has proven to be a valuable survey method for documenting terrestrial landscape change related to, example, biodiversity, urbanization, environmental services such as land vegetation or forest cover use, glacier extent, water resources. Historical oblique photographs offer exceptional opportunities extend the observational record beyond period covered by traditional nadir surveys satellite imagery. Here we apply these methods in...