Christine Gommenginger

National Oceanography Centre

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Meric Srokosz

National Oceanography Centre

Jérôme Benveniste

European Space Research Institute

Peter Challenor

University of Exeter

David Cotton

Graphic Science (United Kingdom)

Jesús Gómez-Enri

Universidad de Cádiz

Paolo Cipollini

European Space Agency

Cristina Martín-Puig

European Organisation for the Exploitation of Meteorological Satellites

Adrien Martin

National Oceanography Centre

Salvatore Dinardo

European Organisation for the Exploitation of Meteorological Satellites

M. Joana Fernandes

Imperial College Healthcare NHS Trust

Cooperative Institutions

National Oceanography Centre

Centre National de la Recherche Scientifique

University of Southampton

Institut de Recherche pour le Développement

European Space Agency

Ifremer

European Space Research and Technology Centre

Laboratoire d’Études en Géophysique et Océanographie Spatiales

Jet Propulsion Laboratory

Université de Bretagne Occidentale

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The benefits of combining coupled wave-current models with SAR observations for the interpretation of ocean-surface currents.

T. Macklin Judith Wolf Sarah Wakelin Christine Gommenginger G. Ferrier

This paper considers the use of coupled wave-current models in combination with synthetic-aperture radar (SAR) and along-track interferometric SAR (ATI) observations for the interpretation of the spatial structure of surface currents. The present status of the development of these models is summarised. Examples over shelf seas, shallow-water bathymetry and estuaries are discussed, for both conventional SAR imagery and along-track interferometry (ATI). The potential practical benefits of combined SAR and model products are outlined.

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Citations (1)

The COASTALT project: Towards an operational use of satellite altimetry in the coastal zone

Oceans (2009)

Stefano Vignudelli Paolo Cipollini Christine Gommenginger Helen M. Snaith Henrique Coelho

In this paper, we will showcase the main outcomes of the COASTALT project, including improved corrections (with special emphasis on the tropospheric effect) and novel re-tracking techniques built on established research results and the processing chain development with the generation and validation of ENVISAT test data sets over a selection of regional sites. We will also dive in further and explore how coastal altimetry might be exploited to its full potential in the coastal zone. This should be of interest to a broad range of data integrators that have an interest in using these improved altimeter data in their operational products or services.

Satellite Altimetry

Satellite Tracking

10.23919/oceans.2009.5422467

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Citations (8)

An Evaluation of CryoSat-2 SAR Mode Performance Around the UK Coasts

AGUFM (2014)

Paolo Cipollini Christine Gommenginger Helen M. Snaith David Cotton S. J. Dinardo

Mode (computer interface)

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On The performance Of CryoSat-2 SAR Mode Over Water Surfaces

ESASP (2011)

Christine Gommenginger Cristina Martín-Puig Salvatore Dinardo Keith Raney Paolo Cipollini

Mode (computer interface)

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NOC satellite oceanography supporting growth of the UK space sector

Christine Gommenginger Meric Srokosz

NOC Satellite Oceanography (NOC-SO) delivers research, consultancy and training in ocean remote sensing techniques relevant to monitoring the ocean, shelf seas and coastal regions globally. NOC has developed close relationships with key stakeholders in the UK space sector such as SSTL and Astrium, leading to significant opportunities for economic growth. Its unique position and long-term outlook allows NOC to define and develop new satellite missions, sensors and Earth Observation products that address scientific and operational needs of NERC and its stakeholders while enhancing international competitive advantage to the UK space industry .

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Earth observation

Communications satellite

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On the problem of the near ocean surface wind speed retrieval by radar altimeter: A two-parameter algorithm

International Journal of Remote Sensing (2002)

Vladimir Karaev M. B. Kanevsky G. N. Balandina P. D. Cotton Peter Challenor

In this paper we present results from a theoretical investigation of the scattering of microwave radar signal by the ocean surface. The aim of the research is to generate an improved altimeter wind speed retrieval algorithm, and to achieve this a new theoretical approach to the problem of microwave scattering has been developed. The inadequacy of the assumption of a single valued relationship between surface wind speed and microwave radar backscatter is discussed, and a more complex approach adopted taking into account the nature of the sea surface. Two versions of a two-parameter algorithm (NA1 and NA2) for near surface wind speed retrieval are developed and presented in a tabular form. Co-located altimeter and buoy data are used to test this new algorithm. Good agreement is found between measured and retrieved values with the new algorithms: NA1- the mean difference M=-0.03 m s -1 and rms=1.47 m s -1 ; NA2- M=0.03 m s -1, rms=1.54 m s -1 . Note, that the currently used algorithm WC91 (see below) has the following characteristics: M=0.43 m s -1 and rms=1.69 m s -1 . The importance of taking into account the regional specific conditions is emphasized.

Buoy

Backscatter (email)

Radar altimeter

10.1080/01431160110075587

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Citations (25)

First Assessment of Geophysical Sensitivities from Spaceborne Galileo and BeiDou GNSS-Reflectometry Data Collected by the UK TechDemoSat-1 Mission

Remote Sensing (2020)

Matthew Hammond Giuseppe Foti Jonathan Rawlinson Christine Gommenginger Meric Srokosz

The UK’s TechDemoSat-1 (TDS-1), launched 2014, has demonstrated the use of global positioning system (GPS) signals for monitoring ocean winds and sea ice. Here it is shown, for the first time, that Galileo and BeiDou signals detected by TDS-1 show similar promise. TDS-1 made seven raw data collections, recovering returns from Galileo and BeiDou, between November 2015 and March 2019. The retrieved open ocean delay Doppler maps (DDMs) are similar to those from GPS. Over sea ice, the Galileo DDMs show a distinctive triple peak. Analysis, adapted from that for GPS DDMs, gives Galileo’s signal-to-noise ratio (SNR), which is found to be inversely sensitive to wind speed, as for GPS. A Galileo track transiting from open ocean to sea ice shows a strong instantaneous SNR response. These results demonstrate the potential of future spaceborne constellations of GNSS-R (global navigation satellite system–reflectometry) instruments for exploiting signals from multiple systems: GPS, Galileo, and BeiDou.

Galileo (satellite navigation)

Reflectometry

10.3390/rs12182927

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Citations (13)

CryoSat-2: From SAR to LRM (FBR) for quantitative precision comparison over identical sea state

38th COSPAR Scientific Assembly (2010)

Cristina Martín-Puig Giulio Ruffini R. K. Raney Christine Gommenginger

The use of Synthetic Aperture Radar (SAR) techniques in conventional altimetry—i.e., Delay Doppler Altimetry (DDA)—was first introduced by R.K. Raney in 1998 [1]. This technique provides an improved solution for water surface altimetry observations due to two major innovations: the addition of along track processing for increased resolution, and multi-look processing for improved SNR. Cryosat-2 (scheduled for launch 2010) will be the first satellite to operate a SAR altimetry mode. Although its main focus will be the cryosphere, this instrument will also be sporadically operative over water surfaces, thus provide an opportunity to test and refine the improved capabilities of DDA. Moreover, the work presented here is of interest to the ESA’s Sentinel-3 mission. This mission will be devoted to the provision of operational oceanographic services within Global Monitoring for the Environment and Security (GMES), and will include a DDA altimeter on board.

Earth observation

Satellite Altimetry

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Ocean wind and roughness retrieval with spaceborne GNSS-Reflectometry: first results from the UK TechDemoSat-1 mission

AGU Fall Meeting Abstracts (2015)

Christine Gommenginger Giuseppe Foti

Reflectometry

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