Emmanuelle Autret

Emmanuelle Autret
Institut Français de Recherche pour l'Exploitation de la Mer | Ifremer · Laboratory of Spatial Oceanography (LOS)

About

37
Publications
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591
Citations

Publications

Publications (37)
Article
Fin whales and sei whales are two migratory baleen whale species sighted every year across the waters of the Azores. Improved understanding of the ecological niche and habitat requirements of these baleen whales is needed to identify persistent or predictable oceanographic events that may set the time of their migration, as well as local or ephemer...
Poster
Full-text available
Blue whales are sighted every year around the Azores islands, which apparently provide an important seasonal foraging area. In this study we aim to characterize habitat preferences and analyse the temporal distribution of blue whales around São Miguel Island. To do so, we applied Generalized Additive Models to a seven-year opportunistic cetacean oc...
Article
Full-text available
Blue whales are sighted every year around the Azores islands, which apparently provide an important seasonal foraging area. In this paper we aim to characterize habitat preferences and analyze the temporal distribution of blue whales around São Miguel Island. To do so, we applied Generalized Additive Models to an opportunistic cetacean occurrence d...
Article
Full-text available
Machine learning techniques are attractive tools to establish statistical models with a high degree of non linearity. They require a large amount of data to be trained and are therefore particularly suited to analysing remote sensing data. This work is an attempt at using advanced statistical methods of machine learning to predict the bias between...
Article
Full-text available
In this paper, we develop a novel observation-driven 5 methodology to explore spatio-temporal dependencies between 6 satellite-derived sea surface height (SSH) and sea surface temper-7 ature (SST) fields. Level-set-based and registration-based criteria 8 are defined to evaluate and detect spatial links between SSH and 9 SST anomaly fields. The meth...
Conference Paper
The potentiality of retrieving high spatial resolution velocity fields by exploiting the synergy between nearly simultaneous observations of infrared SST and along-track altimetry is shown here through a case study in the Gulf Stream region. The presented approach relies on the characterization of a transfer function between the SST observations an...
Article
This thesis focuses on the analysis of several satellite derived sea surface temperature (SST) datasets from instruments with different spatio-temporal resolution. The objective is to analyse, characterize and exploit SST observations with different spatial resolution and possibly improve our understanding of processes at fine scale (1-50 km). The...
Article
Full-text available
The surface signature of Agulhas rings propagat- ing across the South Atlantic Ocean is observed based on three independent data sets: Advanced Microwave Scanning Radiometer for the Earth Observing System/Tropical Rain- fall Measuring Mission (TRMM) Microwave Imager (TMI) (TMI/AMSR-E) satellite sea surface temperature, Argo pro- filing floats and a...
Conference Paper
This paper addresses the simulation of high-resolution geophysical fields from low-resolution satellite observations in the context of the remote sensing of the ocean surface. Within a super-resolution framework, we investigate texture-based stochastic models while controlling high-resolution spectral, geometrical and statistical features. We intro...
Article
Full-text available
The surface signature of the Agulhas rings propagating across the South Atlantic Ocean is observed based on 3 independent datasets: TMI/AMSR-E satellite sea surface temperature, Argo profiling floats and a merged winds product derived from scatterometer observations and reanalysis results. A persistent pattern of cold (negative) SST anomalies in th...
Article
Full-text available
Multi-satellite measurements of altimeter-derived Sea Surface Height (SSH) and Sea Surface Temperature (SST) provide a wealth of information about ocean circulation, especially mesoscale ocean dynamics which may involve strong spatio-temporal relationships between SSH and SST fields. Within an observation-driven framework, we investigate the extent...
Conference Paper
Full-text available
The use of satellite Sea Surface Temperature (SST) fields to retrieve zonal and meridional surface currents (U,V) is now a widespread idea. Since the classical approach involves temporal differencing of SST fields, we investigate in this paper the extent to which mesoscale ocean dynamics may be decomposed into a superposition of dynamical modes, ch...
Conference Paper
Full-text available
This paper addresses stochastic geometry-driven image models and its application to super-resolution issues. Whereas most stochastic image models rely on some priors on the distribution of grey-level configurations (e.g., patch-based models, Markov priors, multiplicative cascades,...), we here focus on geometric priors. We aim at simulating texture...
Article
Full-text available
Le développement des capteurs satellitaires d'observation des traceurs géophysiques à la surface de l'océan et les algorithmes de traitement associés ont connu un essor important au cours des vingt dernières années. Les différents capteurs satellitaires disponibles présentent des résolutions spatiales et temporelles différentes ainsi que différen...
Article
Full-text available
There are a growing number of level 4 (L4; gap-free gridded) sea surface temperature (SST) products generated by blending SST data from various sources which are available for use in a wide variety of operational and scientific applications. In most cases, each product has been developed for a specific user community with specific requirements guid...
Article
Full-text available
In this letter, we evaluate to which extent the activity of ocean fronts can be retrieved from the geometric regularity of ocean tracer observations. Applied to sea surface temperature (SST), we propose a method for the characterization of this geometric regularity from curvature-based statistics along temperature level lines in front regions. To a...
Article
Full-text available
Satellites provide important information on many meteorological and oceanographic variables. State-space models are commonly used to analyse such data sets with measurement errors. In this work, we propose to extend the usual linear and Gaussian state-space to analyse time series with irregular time sampling, such as the one obtained when keeping a...
Article
Full-text available
The Bay of Biscay climatology is the synthesis of all the in situ data collected in the bay of Biscay area as far as 15°W, in the 20th century and mainly by IFREMER, SHOM, and WDCA. It shows temperature and salinity monthly information through the whole water column with a 1/10 degree resolution. The resulting atlas was produced by an optimal analy...
Poster
A European Service for Precise Sea Surface Temperature: Contribution to the GODAE/GHRSST-PP project Medspiration is a real-time service for the production and delivery of high-resolution (2km) sea surface temperature from all available satellite sensors.
Conference Paper
There is an important demand in areas such as environmental and geophysical science for stochastic space-time models. Linear state-space models (also called dynamical linear models) and the Kalman Filter are commonly used for analysing spatially and temporally dependent data. This study focus on a particulary remotely sensed variable, the Sea Surfa...
Article
Full-text available
The Advanced Along-Track Scanning Radiometer (AATSR) onboard Envisat is designed to provide very accurate measurements of sea surface temperature (SST). Using colocated in situ drifting buoys, a dynamical matchup database (MDB) is used to assess the AATSR-derived SST products more precisely. SST biases are then computed. Currently, Medspiration AAT...
Article
Full-text available
Argo floats have significantly improved the observation of the global ocean interior, but as the size of the database increases, so does the need for efficient tools to perform reliable quality control. It is shown here how the classical method of optimal analysis can be used to validate very large datasets before operational or scientific use. The...
Article
Full-text available
We characterize near-surface ocean diurnal warm-layer events, using satellite observations and fields from numerical weather forecasting. The study covers April to September, 2006, over the area 11 degrees W to 17 degrees E and 35 degrees N to 57 degrees N, with 0.1 degrees cells. We use hourly satellite SSTs from which peak amplitudes of diurnal c...
Article
An operational oceanographic system is being developed in France to monitor and forecast ocean behavior. It is composed of three projects: - Sea-surface observation using satellite sensors, - ln situ measurements from ships, moored or drifting autonomous systems, - Assimilation of in-situ and satellite data in an ocean circulation modal. Coriolis c...
Article
Full-text available
In the previous letter, we briefly presented the analysis system operational at the Coriolis datacen-ter. This system both synthetises data sets by pro-ducing temperature and salinity gridded fields and checks for quality the data from the Coriolis data-base in real time. We will focus here on this latter application of the system. We will discuss...
Article
Full-text available
Climate change is perhaps the most pressing and urgent environmental issue facing the world today. However our ability to predict and quantify the consequences of this change is severely limited by the paucity of in situ oceanographic measurements. Marine animals equipped with sophisticated oceanographic data loggers to study their behavior offer o...
Article
Full-text available
Climate change is perhaps the most pressing and urgent environmental issue facing the world today. However our ability to predict and quantify the consequences of this change is severely limited by the paucity of in situ oceanographic measurements. Marine animals equipped with sophisticated oceanographic data loggers to study their behavior offer o...
Article
The CORIOLIS data Centre collects, checks for quality and distributes in real time and delayed modes a great number of in situ data. Managed data sets are mainly temperature and salinity profiles from profiling floats, XBTs, CTDs, XCTDs, drifting and moored buoys. In order to both qualify the data and provide temperature and salinity analyzed field...
Conference Paper
Since June 1999, two satellite scatterometers are operational. The European Remote Sensing Satellite (ERS-2) scatterometer and the NASA Seawind scatterometer onboard the QuikSCAT satellite, provide estimation of surface wind vectors with high spatial and temporal resolutions, using different frequencies and resolution configurations. The paper pres...

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Projects

Project (1)
Archived project
The main objective of this project is to explore and exploit the synergy between IR SST observations provided by the SLSTR sensor and individual altimeter transects of SRAL, both, payloads of Sentinels·3 mission (expected launch mid 2015), in order to reconstruct high resolution ocean surface currents. This project is funded by the ESA Living Planet Fellowship.