Author
Salvatore Dinardo
Other affiliations: European Space Agency, Serco Group
Bio: Salvatore Dinardo is an academic researcher from Bosch. The author has contributed to research in topics: Altimeter & Synthetic aperture radar. The author has an hindex of 11, co-authored 50 publications receiving 482 citations. Previous affiliations of Salvatore Dinardo include European Space Agency & Serco Group.
Papers
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TL;DR: The backscatters power single-look waveform recorded by a synthetic aperture radar altimeter is approximated in a closed-form model, being expressed in terms of parameterless functions, which allows for efficient computation of the waveform and a clear understanding of how the various sea state and instrument parameters affect the wave form.
Abstract: The backscatters power single-look waveform recorded by a synthetic aperture radar altimeter is approximated in a closed-form model. The model, being expressed in terms of parameterless functions, allows for efficient computation of the waveform and a clear understanding of how the various sea state and instrument parameters affect the waveform.
120 citations
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Saleh Abdalla1, Abdolnabi Abdeh Kolahchi, Michael Ablain, Susheel Adusumilli2 +357 more•Institutions (88)
TL;DR: In 2018, the 25th year of development of radar altimetry was celebrated and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences as discussed by the authors.
105 citations
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TL;DR: In this paper, the authors compare the performance of the CryoSat-2 FBR and LRM (pseudo-LRM) data in the coastal zone of the German Bight and West Baltic Sea during a time interval of almost six years, from July 2010 to March 2016.
82 citations
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TL;DR: In this paper, the authors compare the performance of the Synthetic Aperture Radar (SAR) and Pseudo-LRM (PLRM) data with in situ and model data to derive precision and accuracy at 1 Hz in open ocean, at distances larger than 10 km from the coast.
63 citations
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TL;DR: In this paper, a comprehensive evaluation of S3A is conducted at 50 virtual stations (VS) located on a wide range of rivers in China, and the evaluation of Level 1 data shows that, over mountain rivers, a good prior surface elevation estimate on-board is vital to deliver useful datasets using the Sentinel-3A open-loop tracking system.
48 citations
Cited by
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01 Jan 2010
TL;DR: A 23-year database of calibrated and validated satellite altimeter measurements is used to investigate global changes in oceanic wind speed and wave height over this period and finds a general global trend of increasing values of windspeed and, to a lesser degree, wave height.
Abstract: Wind speeds over the world’s oceans have increased over the past two decades, as have wave heights. Studies of climate change typically consider measurements or predictions of temperature over extended periods of time. Climate, however, is much more than temperature. Over the oceans, changes in wind speed and the surface gravity waves generated by such winds play an important role. We used a 23-year database of calibrated and validated satellite altimeter measurements to investigate global changes in oceanic wind speed and wave height over this period. We find a general global trend of increasing values of wind speed and, to a lesser degree, wave height, over this period. The rate of increase is greater for extreme events as compared to the mean condition.
737 citations
01 Jan 2001
TL;DR: Satellite altimetry is helping to advance studies of ocean circulation, tides, sea level, surface waves and allowing new insights into marine geodesy as mentioned in this paper, which is for a broad spectrum of academics, graduate students, and researchers in geophysics, oceanography, and the space and earth sciences.
Abstract: The new level of precision and global coverage provided by satellite altimetry is rapidly advancing studies of ocean circulation. It allows for new insights into marine geodesy, ice sheet movements, plate tectonics, and for the first time provides high-resolution bathymetry for previously unmapped regions of our watery planet and crucial information on the large-scale ocean features on intra-season to interannual time scales. Satellite Altimetry and Earth Sciences has integrated the expertise of the leading international researchers to demonstrate the techniques, missions, and accuracy of satellite altimetry, including altimeter measurements, orbit determination, and ocean circulation models. Satellite altimetry is helping to advance studies of ocean circulation, tides, sea level, surface waves and allowing new insights into marine geodesy. Satellite Altimetry and Earth Sciences provides high resolution bathymetry for previously unmapped regions of our watery planet. Satellite Altimetry and Earth Sciences is for a very broad spectrum of academics, graduate students, and researchers in geophysics, oceanography, and the space and earth sciences. International agencies that fund satellite-based research will also appreciate the handy reference on the applications of satellite altimetry.
443 citations
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European Centre for Medium-Range Weather Forecasts1, Institut de recherche pour le développement2, Central Maine Community College3, Met Office4, Bureau of Meteorology5, Environment Canada6, Japan Meteorological Agency7, University of Reading8, Centre national de la recherche scientifique9, National Oceanic and Atmospheric Administration10, University of Maryland, College Park11, Massachusetts Institute of Technology12, Japan Agency for Marine-Earth Science and Technology13, University of Hamburg14, California Institute of Technology15, National Institute of Geophysics and Volcanology16, Centre National D'Etudes Spatiales17, Goddard Space Flight Center18, University of California, Los Angeles19, State Oceanic Administration20, IFREMER21
TL;DR: In this article, a multi-reanalysis ensemble is used to estimate the signal-to-noise ratio (SNR) of the ocean state and to estimate uncertainty levels.
Abstract: Uncertainty in ocean analysis methods and deficiencies in the observing system are major obstacles for the reliable reconstruction of the past ocean climate. The variety of existing ocean reanalyses is exploited in a multi-reanalysis ensemble to improve the ocean state estimation and to gauge uncertainty levels. The ensemble-based analysis of signal-to-noise ratio allows the identification of ocean characteristics for which the estimation is robust (such as tropical mixed-layer-depth, upper ocean heat content), and where large uncertainty exists (deep ocean, Southern Ocean, sea ice thickness, salinity), providing guidance for future enhancement of the observing and data assimilation systems.
211 citations
01 Apr 1980
TL;DR: In this article, the mean backscattered return power for a short-pulse radar and near-normal-incidence scattering from a rough ocean surface is given by the convolution of several terms.
Abstract: Under assumptions common in radar altimetry, the mean backscattered return power for a short-pulse radar and near-normal-incidence scattering from a rough ocean surface is given by the convolution of several terms. For a nearly Gaussian transmitted pulse shape scattered from a nearly Gaussian distributed sea surface, a small-argument series expansion of one of the terms within the convolution leads to a several-term power series expansion for the mean return waveform. Specific expressions are given for the first four terms. These results, which require much less computer time than would the otherwise necessary numerical convolution, are useful for data analysis from current or past radar altimeters and for design studies of future systems. Several representative results are presented for an idealized SEASAT radar altimeter.
188 citations
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TL;DR: In this paper, the authors present an improved hybrid sea-level reconstruction during 1900-2015 that combines previous techniques at time scales where they perform best, finding a persistent acceleration in GMSL since the 1960s and demonstrate that this is largely associated with sea-layer changes in the Indo-Pacific and South Atlantic.
Abstract: Previous studies reconstructed twentieth-century global mean sea level (GMSL) from sparse tide-gauge records to understand whether the recent high rates obtained from satellite altimetry are part of a longer-term acceleration. However, these analyses used techniques that can only accurately capture either the trend or the variability in GMSL, but not both. Here we present an improved hybrid sea-level reconstruction during 1900–2015 that combines previous techniques at time scales where they perform best. We find a persistent acceleration in GMSL since the 1960s and demonstrate that this is largely (~76%) associated with sea-level changes in the Indo-Pacific and South Atlantic. We show that the initiation of the acceleration in the 1960s is tightly linked to an intensification and a basin-scale equatorward shift of Southern Hemispheric westerlies, leading to increased ocean heat uptake, and hence greater rates of GMSL rise, through changes in the circulation of the Southern Ocean. Satellite altimetry shows global mean sea-level rise acceleration; however, sparse tide-gauge data limit understanding of the longer-term trend. A hybrid method of reconstruction for 1900–2015 shows acceleration since the 1960s, linked to increases and shifts in Southern Hemisphere westerly winds.
185 citations