A5004306850- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Oceanographic and Atmospheric Processes
- Oil Spill Detection and Mitigation
- Ocean Waves and Remote Sensing
- Climate change and permafrost
- Marine and coastal ecosystems
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Tropical and Extratropical Cyclones Research
- Water Quality Monitoring Technologies
- Coastal and Marine Dynamics
- Underwater Acoustics Research
- Soil Moisture and Remote Sensing
- Toxic Organic Pollutants Impact
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Flood Risk Assessment and Management
- Translation Studies and Practices
- Water Quality Monitoring and Analysis
- Geophysics and Gravity Measurements
- Coastal wetland ecosystem dynamics
- Advanced SAR Imaging Techniques
- Precipitation Measurement and Analysis
- Underwater Vehicles and Communication Systems
- Reservoir Engineering and Simulation Methods
Jet Propulsion Laboratory
2016-2025
Savoirs, Textes, Langage
2022-2024
Université de Lille
2023-2024
American Society For Engineering Education
2024
Laboratoire Parole et Langage
2022
Institut de Recherche Interdisciplinaire sur les Enjeux Sociaux
2022
University of Leeds
2022
University of Washington Applied Physics Laboratory
2016
California Institute of Technology
1992-2013
European Space Research and Technology Centre
2002
We analyze the fully-polarimetric Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) data acquired on June 23, 2010, from two adjacent, overlapping flight tracks that imaged main oil slick near Deepwater Horizon (DWH) rig site in Gulf of Mexico. Our results show radar backscatter both clean water and is predominantly a single surface scatterer, consistent with tilted Bragg scattering mechanism, across range incidence angles 26° to 60°. change over due damping ocean wave spectral...
Criteria for discriminating between radar signatures of oil films and biogenic slicks visible on synthetic aperture (SAR) images the sea surface as dark patches are critically reviewed. We question often claimed high success rate spill detection algorithms using single-polarization SARs because SAR used to train these based usually subjective interpretation not validated by on-site inspections or multi-sensor measurements carried out from pollution surveillance planes. Furthermore, we doubt...
Abstract A large collaborative program has studied the coupled air‐ice‐ocean‐wave processes occurring in Arctic during autumn ice advance. The included a field campaign western of 2015, with situ data collection and both aerial satellite remote sensing. Many analyses have focused on using improving forecast models. Summarizing synthesizing results from series separate papers, overall view is an shifting to more seasonal system. dramatic increase open water extent duration means that surface...
Abstract Sea ice is generally covered with snow, which can vary in thickness from a few centimeters to >1 m. Snow cover acts as thermal insulator modulating the heat exchange between ocean and atmosphere, it impacts sea-ice growth rates overall thickness, key indicator of climate change polar regions. depth required estimate using freeboard measurements made satellite altimeters. The snow also mechanical load that depresses (snow above sea level). Freeboard depression result flooding...
The sea state of the Beaufort and Chukchi seas is controlled by wind forcing amount ice-free water available to generate surface waves. Clear trends in annual duration open season extent seasonal ice minimum suggest that should be increasing, independent changes forcing. Wave model hindcasts from four selected years spanning recent conditions are consistent with this expectation. In particular, larger waves more common less summer and/or a longer season, peak wave periods generally longer....
Abstract Transport characteristics of oil slicks are reported from a controlled release experiment conducted in the North Sea June 2015, during which mineral emulsions different volumetric fractions and look‐alike biogenic were released allowed to develop naturally. The used Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) track slick location, size, shape for ∼8 h following release. Wind conditions exercise at high end range considered suitable radar‐based detection, but easily...
This study describes the characteristics of extensive small‐scale coastal ocean eddies in Southern California Bight. These surface features were primarily detected by using ERS‐1 and ERS‐2 synthetic aperture radar (SAR) satellite imagery from 1992 to 1998. The eddies, predominantly cyclonic their rotation, appeared result several forcing mechanisms. They mainly observed within Santa Barbara Channel Monica‐San Pedro Basin regions be seasonal distribution. Observed eddy diameters all less than...
One of the largest Arctic polynyas occurs along Alaskan coast Chukchi Sea between Cape Lisburne and Point Barrow. For this polynya, a new thin ice thickness algorithm is described that uses ratio vertically horizontally polarized Special Sensor Microwave/Imager (SSM/I) 37‐GHz channels to retrieve distribution thicknesses heat fluxes at 25‐km resolution. Comparison with clear‐sky advanced very high resolution radiometer data shows SSM/I are valid for less than 10–20 cm, comparison several...
An approach for identification of sea ice types in spaceborne synthetic aperture radar (SAR) image data is presented. The unsupervised classification involves cluster analysis segmentation the followed by labeling based on previously defined look‐up tables containing expected backscatter signatures different measured land‐based scatterometer. particular table used a segmented selected seasonal and meteorological conditions at time acquisition. extensive scatterometer observations experience...
Pronounced signatures of internal waves were detected repeatedly in the Gulf California by Seasat synthetic aperture radar (SAR). A series nine images with exactly repeating ground coverage was used to study temporal variability wave field area. It found that number observed groups highly correlated strength local tides: maximum occurred during spring tides and minimum neap tides, indicating tidally forced. Most activity north 28°N where strongest Gulf. The application a simple, nonlinear...
During the spring of 2009, an ultrawideband microwave radar was deployed as part Operation IceBridge to provide first cross‐basin surveys snow thickness over Arctic sea ice. In this paper, we analyze data from three ∼2000 km transects examine detection issues, limitations current instrument, and regional variability retrieved depth. Snow depth is vertical distance between air‐snow snow‐ice interfaces detected in echograms. Under ideal conditions, per echogram uncertainty retrieval ∼4–5 cm....
Abstract The early autumn voyage of RV Sikuliaq to the southern Beaufort Sea in 2015 offered very favorable opportunities for observing properties and thicknesses frazil‐pancake ice types. operational region was overlaid by a dense network retrieved satellite imagery, including synthetic aperture radar (SAR) imagery from Sentinel‐1 COSMO‐SkyMed (CSK). This enabled us fully test apply SAR‐waves technique, first developed Wadhams Holt (1991), deriving thickness icefields changed wave...
Sea surface salinity (SSS) links various components of the Arctic freshwater system. SSS responds to inputs from river discharge, sea ice change, precipitation and evaporation, oceanic transport through open straits Pacific Atlantic oceans. However, in situ data Ocean are very sparse insufficient depict large-scale variability address critical question how climate change affect freshwater. The L-band microwave radiometer on board NASA Soil Moisture Active Passive (SMAP) mission has been...
The Spaceborne Imaging Radar-C, X-Band Synthetic Aperture Radar (SIR-C/X-SAR) was launched on the Space Shuttle Endeavour for two ten day missions in spring and fall of 1994. data from these are being used to better understand dynamic global environment. During each mission, radar images over 300 sites around Earth were obtained, returning a terabit data. SIR-C/X-SAR science investigations focused quantifying radar's ability estimate surface properties importance understanding change;...
In this paper the ocean wave dispersion relation and viscous attenuation by a sea ice cover are studied for waves propagating into marginal zone (MIZ). The derivation of an sheet discussed under flexure pack compression. MIZ, effect is important short waves. For fixed period changes in wavelength group velocity as function thickness significant. turn, exponential rate shows rollover at periods, whereby rapid increase with decreasing slows down or even turns decrease. Labrador Ice Margin...
An analysis of first‐year fast sea ice during the melt season has been made by using surface measurements and aircraft radar photographic imagery obtained a field study near Prince Patrick Island in Canadian Archipelago from June 13 to July 13, 1982, satellite Landsat Seasat. Distinct changes observed properties snow layer were temporary increase small‐scale roughness caused formation nodules at snow/ice interface; extensive flooding; development water drainage networks low topography around...
Compact polarimetry (CP) synthetic aperture radar (SAR) is a form of coherent dual-pol SAR that has been shown to have great potential for maritime surveillance applications such as ship and ice detection. In this paper, we demonstrate the CP data oil spill characterization. As availability limited at time, simulate image from UAVSAR L-Band quad-polarized images. We reconstruct quad-pol (termed pseudo-quad) these simulated data, calculate an oil-water mixing index, termed Mdex. show...
Oil spill detection using a time series of images acquired off Norway in June 2015 with the uninhabited aerial vehicle synthetic aperture radar is examined. The relative performance set features derived from quad-polarization versus hybrid-polarity (HP) modes various types slicks as they evolve on high wind driven sea surface evaluated. It shown that HP mode comparable full-polarimetric its ability to distinguish open water (OW) for challenging conditions winds (9-12 m/s), small release...