A5036482928- Cryospheric studies and observations
- Soil Moisture and Remote Sensing
- Climate change and permafrost
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Arctic and Antarctic ice dynamics
- Hydrology and Watershed Management Studies
- Flood Risk Assessment and Management
- Precipitation Measurement and Analysis
- Ocean Waves and Remote Sensing
- Oceanographic and Atmospheric Processes
- Geophysics and Gravity Measurements
- Landslides and related hazards
- Winter Sports Injuries and Performance
- Hydrology and Sediment Transport Processes
- Underwater Acoustics Research
- GNSS positioning and interference
- Atmospheric and Environmental Gas Dynamics
- Coastal and Marine Dynamics
- Microplastics and Plastic Pollution
- Methane Hydrates and Related Phenomena
- Spacecraft and Cryogenic Technologies
- Advanced SAR Imaging Techniques
- Strategic Planning and Analysis
- Underwater Vehicles and Communication Systems
- Meteorological Phenomena and Simulations
University of Auckland
2019-2025
Software (Spain)
2024
Stockholm International Water Institute
2022
Remote Sensing Solutions (United States)
2010-2020
John Wiley & Sons (United States)
2019
California Institute of Technology
2000-2016
Oceanography Society
2016
Jet Propulsion Laboratory
2002-2014
Radar (United States)
2003
University of Massachusetts Amherst
1995-2002
Plastics and other artificial materials pose new risks to health of the ocean. Anthropogenic debris travels across large distances is ubiquitous in water on shorelines, yet, observations its sources, composition, pathways distributions ocean are very sparse inaccurate. Total amounts plastics man-made shore, temporal trends these under exponentially increasing production, as well degradation processes, vertical fluxes time scales largely unknown. Present circulation models not able accurately...
Sustained observations are required to determine the marine plastic debris mass balance and support effective policy for planning remedial action. However, currently remain scarce at global scale. A satellite remote sensing system could make a substantial contribution tackling this problem. Here, we initial steps towards potential design of such by: (1) identifying properties amenable methods (2) highlighting oceanic processes relevant scientific questions about debris. Remote approaches...
The proposed Surface Water and Ocean Topography (SWOT) mission would provide measurements of water surface elevation (WSE) for characterization storage change discharge. River channel bathymetry is a significant source uncertainty in estimating discharge from WSE measurements, however. In this paper, we demonstrate an ensemble‐based data assimilation (DA) methodology bathymetric depth slope the LISFLOOD‐FP hydrodynamic model. We performed two proof‐of‐concept experiments using synthetically...
Melting of the Greenland Ice Sheet represents a major uncertainty in projecting future rates global sea level rise. Much this is related to lack knowledge about subsurface oc ...
Abstract Fluctuations in water surface elevation (WSE) along rivers have important implications for resources, flood hazards, and biogeochemical cycling. However, current situ remote sensing methods exhibit key limitations characterizing spatiotemporal hydraulics of many the world's river systems. Here we analyze new measurements WSE slope from AirSWOT, an airborne analogue to Surface Water Ocean Topography (SWOT) mission aimed at addressing remotely sensed observations water. To evaluate...
Polarimetric GNSS-R systems, equipped with an additional polarization channel, offer enhanced capabilities for separating vegetation and surface scattering effects, thereby improving land remote sensing applications such as soil moisture retrieval in vegetated forested areas biomass estimation. However, the effectiveness of these relies on accurate calibration polarimetric sensor. In Rongowai mission, a newly developed Next Generation Receiver (NGRx) is installed domestic Air New Zealand...
The Microwave Observatory of Subcanopy and Subsurface (MOSS) is a mission concept for spaceborne synthetic aperture radar (SAR) system that provides global observations soil moisture under substantial vegetation cover (exceeding 20 kg/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) at useful depths (1-5 m). was developed number new required technologies were demonstrated through National Aeronautics Space Administration Earth Science...
This letter presents the first demonstration of millimeter-wave single-pass interferometric synthetic aperture radar (InSAR) for snow-depth mapping. Maps are presented over Tuolumne River Basin region Sierra Nevada, CA, USA, and compared with those collected by a scanning lidar onboard NASA Airborne Snow Observatory same on snow day. For this observation, surface was wet melting as such penetration electromagnetic wave into volume can be effectively neglected. Despite rugged terrain, heavy...
AirSWOT, an experimental airborne Ka-band interferometric synthetic aperture radar, was developed for hydrologic research and validation of the forthcoming Surface Water Ocean Topography (SWOT) satellite mission (to be launched in 2021). AirSWOT SWOT aim to improve understanding surface water processes by mapping elevation (WSE) slope (WSS) rivers, lakes, wetlands. However, utility these purposes remains largely unexamined. We present first investigation WSE WSS surveys over complex,...
As part of the NASA International Polar Year activities, a Ka-band cross-track interferometric synthetic aperture radar (SAR) recently demonstrated high-precision elevation swath mapping capability. This proof-of-concept instrument was achieved by interfacing two slotted-waveguide antennas in geometry and electronics with Jet Propulsion Laboratory's L-band uninhabited aerial vehicle SAR. Deployed on Gulfstream III, initial engineering flights March April 2009 marked first airborne...
Along-track interferometric synthetic aperture radar (ATI-SAR) is an active coherent imaging system, utilizing two antennas separated along the platform flight direction. The phase information of ATI-SAR from Doppler shift backscattered signal represents line-of-sight velocity water scatterers. While advent provided us with a potentially powerful technique for ocean surface current and wave mapping, has not been measured exactly because simply proportional to component mean current. It also...
Iceland is part of the accreting plate boundary between American and European plates. Since 1965 a number repeated triangulation‐trilateration surveys spanning neovolcanic zone in NE were made order to detect crustal movements. All measurements for single observation epoch are separately adjusted by method least squares. Statistical tests carried out check observations adjustment models outliers model errors. To significant movements repeatedly measured geodetic networks with multivariate...
OPINION article Front. Earth Sci., 28 August 2015Sec. Hydrosphere Volume 3 - 2015 | https://doi.org/10.3389/feart.2015.00050
Measuring ice surface topography over the major caps of Greenland and Antarctica is crucial to quantifying understanding effect climate change on Earth's environment. Multiple sensors including radars, lidars, optical systems have been utilized in making these measurements. To integrate data from multiple into a coherent self-consistent history cap requires knowledge where vertically within snow volume elevation measurement corresponds. This paper examines penetration Ka-band cross-track...
Radar‐derived ocean surface currents are analyzed in conjunction with situ acoustic Doppler current profiler (ADCP) measurements. The interferometric measurements were collected by an X‐band imaging radar a manner analogous to those of along‐track synthetic aperture (ATI‐SAR). While the advent ATI‐SAR has provided new, potentially powerful technique for mapping, relationship between and velocity is not yet clearly understood. This paper presents comparisons radar‐derived To develop precise...
Digital elevation models (DEMs) are essential data sets for disaster risk management and humanitarian relief services as well many environmental process models. At present, on the hand, globally available DEMs only meet basic requirements modeling studies not of high enough spatial resolution lack accuracy in vertical. On other LiDAR-DEMs very great vertical but acquisition operations can be costly scales larger than a couple hundred square km also have severe limitations wetland areas under...
The increasing frequency and severity of flood events demand improved accuracy hydrodynamic models to better mitigate the societal economic consequences these disasters. Ideally, derive elevation data from high-accuracy LiDAR, which often captures subtle variations in microtopography—elements that are critical high-resolution modeling. Due largely cost acquisitions, data, however, not widely available at high spatial resolutions for large-scale areas, i.e. floodplains coastal regions,...