360 Works

Feed-back and contribution after several years of Haiyang-2B data availability

Alexandre Philip, Guillaume Taburet, Yannice Faugère, Nadège Quéruel, François Bignalet-Cazalet & Gérald Dibarboure
The Haiyang-2B (H2B) mission has been launched in October 2018 by the Chinese Agency NSOAS (National Satellite Ocean Application Service). H2B is the second unit of the Haiyang-2 altimetry Program which also features HY2C (launched in September 2020) and HY2D (launched in May 2021) as well as the upcoming units E to H in the future. These satellites are dedicated to monitor the dynamic ocean environment and they bring a significant contribution to the sampling...

CRISTAL – Copernicus’ Next Cryosphere Altimetry Mission

Enrico Mank, Franck Borde, Friedhelm Rostan, Yves Le Roy & Faviola Romero
The Copernicus Polar Ice and Snow Topography Altimeter (CRISTAL) mission is planned to be launched in 2027 and will carry the first Ku/Ka band interferometric altimeter (IRIS) for enhanced sea ice thickness measurement and overlying snow depth retrieval. It utilizes a high PRF open burst mode allowing for fully focussed SAR processing with along-track resolutions below 10 m. It will also have the capability to detect icebergs. CRISTAL will also measure ice sheet and glacier...

The Harvest Experiment: Status and New Results from the Sentinel-6 Mission

Bruce Haines, Shailen Desai, Jean-Damien Desjonquères, Bob Leben, Christian Meinig, Scott Stalin & Andy Wu
We describe the latest satellite radar altimeter calibration/validation (CALVAL) results from the Harvest offshore platform and vicinity. Located 10 km off the coast of central California near Point Conception, Harvest has served as the NASA prime verification site for the TOPEX/POSEIDON (T/P) and Jason series of altimeter reference missions for three decades. The T/P repeat ground track was designed to take the satellite directly over Harvest every ten days, enabling the development of a continuous...

Analysis of hydrographic data collected by Southern Elephant Seals in the Argentine continental shelf

Melina M Martinez, Laura Ruiz-Etcheverry, Martin Saraceno & Christophe Guinet
Within the OSTST SABIO project, in situ data obtained from CTD (Conductivity, Temperature and Depth) sensors attached on 6 elephant seals (Mirounga Leonina) during the period between the 17th and 31st of October 2019 are analyzed . First, data quality is assessed through the comparison with Satellite Sea Surface Temperature Multi-scale Ultra-high Resolution (SST MUR). The sub-surface (15 m depth) in situ data collected correlates very well (r=0.9) with the SST-MUR, suggesting that the in...

Uncertainties in SSB modeling and impact on MSL

Sébastien Figerou, Ngan Tran, François Bignalet-Cazalet, Gerald Dibarboure & Craig Donlon
Current operational SSB corrections are derived empirically and built up as look-up tables that describe the SSB amplitude as a 2D function of the SWH and the wind speed parameters, both directly measured by altimeters. Different aspects of the empirical determination have been improved through the years: statistical methods for the SSB modeling, ways to extract the SSB signals from the SSH data, and improvement in the sea state description to better describe in-turn the...

5Hz resolution altimetry wave products for better coastal approach

Annabelle Ollivier, Adrien Nigou, Isabelle Pujol, Gerald Dibarboure, Alice Dalphinet, Francois Soulat, Alejandro Bohe, Fanny Piras, Ngan Tran & Fabrice Ardhuin
CMEMS Wave TAC next baseline will be 5Hz resolution wave products, 1km along track, to answer to the users community who wants to get closer to the shore. Therefore, in the Sea State community, the literature usually assumes that altimetry waves at 1Hz is dominated by noise (Ardhuin et al. 2019) and most studies tackle this issue by filtering these data up to 50km at least (Quilfen et al. 2018, Dodet et al. 2020). It...

Evaluation of coastal water level products in SAR mode

Luciana Fenoglio, Hakan Uyanik, Bernd Uebbing, Sophie Stolzenberger, Buchhaupt Christopher & Jürgen Kusche
Coastal zones, estuaries and inland waters are among the environments most affected by anthropogenic impact and climate change and are multi-risk due to coastline retreat, flooding and pollution. Accurate knowledge of water height is of major importance to analyze and understand causes and drivers of changes and to plan protection measures. Satellite delay doppler altimetry (DDA) provides improved results compared to conventional altimetry (CA). Goal of this study is the evaluation of the state of...

Dynamics of the North Pacific “garbage patch” observed with a suite of Lagrangian instruments for ecological applications

Nikolai Maximenko, Jan Hafner, Mary Crowley, Luca Centurioni, Andrey Shcherbina, James Carlton, Linsey Haram, Verena Hormann, Cathryn Murray, Gregory Ruiz, Cynthia Wright & Chela Zabin
The FloatEco (Floating Ecosystem) experiment studies physical and biological processes controlling the neopelagic ecosystem emerging in the eastern subtropical North Pacific as a result of marine debris accumulation in the so-called “garbage patch” area. Here, we present preliminary results of the study of pathways of debris into, from, and inside the area based on the analysis of trajectories and derived dynamical characteristics of drifters of various geometry as well as real debris items tagged with...

Determination of the geocentric gravitational constant to monitor the behavior of the Earth

Marie CHERRIER, Alexandre COUHERT, Clément COURDE, Pierre EXERTIER, Jean-Michel LEMOINE, Flavien MERCIER & Eléonore SAQUET
For the past fifty years, geodetic satellites have contributed to the measurement of numerous geophysical parameters. They thus enabled us to improve our knowledge on several Earth's physical parameters and behaviors, through their refined observation. In particular, the geocentric gravitational coefficient is a key contributor to Satellite Laser Ranging (SLR) validation of the stringent accuracy requirement on the radial positioning of altimeter satellites, defining sea level relative to the Earth’s center of mass. Indeed, SLR...

Sentinel-3 Marine Altimetry Mission

Bruno Lucas
Sentinel-3 is part of a series of Sentinel satellites responsible for taking care of a continuous ‘health check’ of the Earth planet under the umbrella of the Copernicus program. The Copernicus program will launch four Sentinel-3 satellites (from A to D) to achieve this goal from 2016 to 2030s. EUMETSAT’s ground segment is responsible for the processing of the Sentinel-3 altimetry data in the marine environment: open ocean, coastal zones and sea level into the...

Towards 30 years of Arctic sea ice freeboard retrieval using Altimetry

Marion Bocquet, Sara Fleury, Thomas Moreau, Florent Garnier & Frédérique Rémy
Sea ice thickness is an important variable for sea ice monitoring and climate projections. Although observations of ice extent and concentration have been available since late 1978, the same is not true for ice thickness. Because of the high interannual variability of the ice pack, climate trends in thickness and volume can only be observed over long time series. The earliest measurements of sea ice thickness (as multi-year averages for ERS-1 and ERS-2) were published...

12 years of Cryosat-2 range,datation and interferometer calibration with Transponder

Adrián Flores de la Cruz, Albert Garcia-Mondéjar, Jerome Bouffard, Alessandro Di Bella, Mònica Roca & Marco Fornari
The CryoSat-2 mission is designed to determine fluctuations in the mass of the Earth’s land and the marine ice fields. Its primary payload is a radar altimeter that operates in different modes optimised depending on the kind of surface: Low resolution mode (LRM), SAR mode (SAR) and SAR interferometric mode (SARIn). This instrument is named SIRAL: SAR Interferometric Radar Altimeter. Transponders are commonly used to calibrate absolute range from conventional altimeter waveforms because of its...

A Broadband View of the Sea Surface Height Wavenumber Spectrum

Bia Villas Bôas, Luc Lenain, Bruce Cornuelle, Sarah Gille & Matthew Mazloff
The variability of sea surface height (SSH) is controlled by processes that span a broad range of spatial and temporal scales. At mesoscales and large submesoscales (300--15 km), the SSH spectrum is expected to be consistent with quasi-geostrophic (QG) turbulence theory and to be characterized by a quasi-linear spectral slope, with variance decaying toward higher wavenumbers. In contrast, at scales ranging from hundreds of meters to a few meters, SSH variability is dominated by surface...

Benefits of multi-altimeter combination for Arctic sea surface height retrievals

Pierre Prandi, Pierre Veillard, Yannice Faugère & Gérald Dibarboure
We present a new Arctic sea level dataset (https://doi.org/10.24400/527896/a01-2020.001) based on the optimal interpolation of three satellite radar altimetry missions. A dedicated processing is applied on measurements from SARAL/AltiKa, CryoSat-2 and Sentinel-3A to identify radar echoes coming from leads in the ice covered regions of the Arctic Ocean. After a data editing and application of instrumental, environmental and geophysical corrections tailored for the Arctic Ocean, these echoes are combined with open ocean echoes through an...

New advances in altimetry towards the coast : example of the CTOH sea level products

Fabien Léger, Florence Birol, Fernando Niño, Wassim Fkaier & Fabien Blarel
Through different projects, the Center for Topographic studies for the Ocean and Hydrosphere (CTOH) contributes largely to advances in coastal altimetry and to its use in coastal applications. It has developed the X-TRACK software dedicated to the reprocessing of coastal altimetry data. X-TRACK is now a mature sea level product distributed worldwide by AVISO+ (https://www.aviso.altimetry.fr), cited in many scientific publications. It consists in long time-series of SLA from most altimetry missions, processed homogeneously, but also...

Ocean 2D eddy energy fluxes from small mesoscale processes with SWOT

Elisa Carli, Robin Chevrier, Rosemary Morrow & Oscar Vergara
Ocean mesoscale eddies are the most energetic component of the ocean dynamics, important for the horizontal fluxes of energy, momentum, and tracers such as heat, carbon and nutrients. Today, observations of smaller scales are limited, and we might be missing 75% of the mesoscale eddies at high latitudes. The future SWOT SAR-interferometry wide-swath altimeter mission aims to provide 2D swath observations of ocean surface topography to characterize the ocean mesoscale and submesoscale circulation from the...

Innovative solutions for in-situ Cal/Val of satellite altimetry over inland waters based on UAV and new autonomous micro-gauges

Jean-Christophe Poisson, Guillaume Valladeau, Nicolas Picot & François Boy
The first radar altimetry missions were dedicated to the open ocean. However, continental water surfaces (enclosed seas, lakes, rivers, flooding areas...) can also be measured by satellite altimetry. For many years now, satellite altimetry is increasingly used to monitor inland waters all over the globe, and even more with the advent of delay doppler radar altimeter embedded on the Copernicus Sentinel-3 and Sentinel6-MF missions, and the future SWOT mission based on interferometric radar imagery. For...

Comparing elevation changes observed by CryoSat-2 and ICESat-2 over the Greenland Ice Sheet

Nitin Ravinder, Andrew Shepherd, Inès Otosaka & Thomas Slater
Satellite altimeters have continuously observed surface elevation changes across the Greenland Ice Sheet surface for the past three decades. Improvements made in processing these observations and in the development of new sensors during this time, have culminated in high resolution instruments, which are able to provide new insights into the physical processes and changes that the Greenland Ice Sheet experiences as the climate warms. Here, we compare elevation changes and trends in elevation change observed...

Sentinel-3 Altimetry Thematic Data Product for inland waters & Sentinel-3 Validation Team benefits

Clément Lacrouts, Pierre Féménias, Stefano Vignudelli, Ghita Jettou, Matthias Raynal, Laïba Amarouche, Nicolas Taburet & Maxime Vayre
With the launch of Sentinel-3A (2016) and Sentinel-3B (2018), the Copernicus programme has a constellation of two SAR altimeters, which provides an operational access to inland Water Surface Height (WSH) data (i.e., lakes and rivers), with outstanding product performance and data coverage. To further improve the performance of the Sentinel-3 Altimetry LAND products, ESA is developing dedicated and specialized Level-1 and Level-2 processing chains for all S3 Altimetry Land surfaces, i.e., over Inland Waters and...

Frequency dependence of ocean surface kinetic energy and its vertical structure from global high-resolution models and surface drifter observations

Brian Arbic, Shane Elipot, Jonathan Brasch, Dimitris Menemenlis, Aurelien Ponte, Jay Shriver, Xiaolong Yu, Edward Zaron, Matthew Alford, Maarten Buijsman, Ryan Abernathey, Daniel Garcia, Lingxiao Guan, Paige Martin & Arin Nelson
Surface oceanic kinetic energy is of interest for many reasons, and a greater understanding of the vertical structure of the kinetic energy would aid interpretation of ongoing and proposed remote sensing missions that are focused on velocity. In this work, kinetic energy (KE) at the sea surface (0 m) and 15 m depth in high-resolution global simulations (HYbrid Coordinate Ocean Model; HYCOM, and Massachusetts Institute of Technology general circulation model; MITgcm) is compared with KE...

Copernicus POD Service: Overview and status

Jaime Fernández, Marc Fernández, Heike Peter & Pierre Féménias
The Copernicus Precise Orbit Determination (CPOD) Service delivers, as part of the Ground Segment of the Copernicus Sentinel-1, -2, -3, and -6 missions, orbital products and auxiliary data files for their use in the corresponding Payload Data Ground Segment (PDGS) processing chains at ESA and Eumetsat and to external users through the ESA Copernicus Open Access Hub. In this contribution focus is given to the altimeter satellites Sentinel-3A, -3B, and Sentinel-6 Michael Freilich for which...

DORIS/DIODE: the last improvements

Jean-Pierre Chauveau
Many improvements were realized in the last years concerning DORIS and DIODE in particular. The DIODE v5.05 is in operation aboard Jason-3, Sentinel 3A and 3B since mid-2022, improving the performances of the real-time navigation. This new version, also aboard the next flying mission SWOT, will deliver for the altimeter KaRin a geodetic bulletin of high precision for the next 20 seconds. This presentation will focus on these improvements and will give some ideas for...

AlTiS Software for generating Time-Series of Water Levels from Radar Altimetry Data

Fabien Blarel, Damien Allain, Florence Birol, Denis Blumstein, Robin Chevrier, Lucrèce DJEUMENI, Wassim Fkaier, Frederic Frappart, Yvan Gouzenes, Fabien Leger, Rosemary Morrow & Fernando Niño
AlTiS (Altimetry Time Series) is a software to visualize and process radar altimetry data. It was developed to analyse radar altimetry data over small areas like river, lakes and wetlands, located in the altimetry groundtracks. Its major goal is the creation of time-series of water levels from the height derive from the altimeter measurement but it can also be used to generate time series of any altimetry-based parameters (e.g., corrections applied to the range, backscattering...

Refined S-6 sea state bias correction models and a multi-frequency EM bias assessment using C-, Ku-, and Ka-band data

Doug Vandemark, Hui Feng, Ngan Tran & Brian Beckley
This study will report on results from two parallel sea state bias correction model investigations. Ongoing verification of sea level measurements from the Sentinel-6 Michael Freilich mission suggests the possibility of systematic range bias and noise due to the use of preliminary sea state bias correction models based on tandem comparisons with Jason-3 altimeter data. New C- and Ku-band sea state bias models built using Side-B altimeter data from S-6 will be presented including an...

An initial investigation of multi-sensor coastal zone altimetry

Brett Buzzanga & Ben Hamlington
Satellite altimetry continues to revolutionize ocean science, enabling precise observations of geocentric sea level with near-global coverage. However, altimetry has traditionally been challenged in the coastal zone (within 20 km of land) due to the presence of land in the altimeter and radiometer footprint. As the oceans further encroach on coastal communities, a more detailed understanding of the physical processes impacting sea-level variability as it propagates landward is needed. State-of-the-art satellite altimeters have the potential...

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  • 2022
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  • Conference Paper
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