Orens Pasqueron de Fommervault

UNESCO

In May 2018, an unprecedented long and intense seismic-volcanic crisis broke out off the island of Mayotte (Indian Ocean) and was associated with the birth of an underwater volcano (Fani Maoré). Since then, an integrated observation network has been created (REVOSIMA), with the given objective of monitoring and better understanding underwater volca...

Intense glider monitoring was conducted in the Ligurian Sea for five months to capture the Net Community Production (NCP) variability in one of the most dynamic and productive regions of the Mediterranean Sea. Using the SeaExplorer glider technology, we were able to observe continuously from January to the end of May 2018 the physical and biogeoche...

Global environnemental monitoring witha SeaExplorerglider with a specific emphasis on P&A applications. O&G detections anomalies

Estimating the diffuse attenuation coefficient of the Photosynthetically Available Radiation (KPAR) allows to monitor primary production, dissolved organic matters, coastal suspended sediments and water transparency. The latter aim, especially for military purposes, may be efficiently achieved with the use of underwater gliders. The present study a...

Estimating the diffuse attenuation coefficient of the Photosynthetically Available Radiation (KPAR) allows to monitor primary production, dissolved organic matters, coastal suspended sediments and water transparency. The latter aim, especially for military purposes, may be efficiently achieved with the use of underwater gliders. The present study a...

In May 2018, an unprecedented long and intense seismic-volcanic crisis broke out off the island ofMayotte (Indian Ocean) and was associated with the birth of an underwater volcano. Since then, anintegrated observation network has been created (REVOSIMA), with the given objective of monitoringand better understanding underwater volcanic phenomena. R...

Surface chlorophyll concentrations inferred from satellite images suggest a strong influence of the mesoscale activity on biogeochemical variability within the oligotrophic regions of the Gulf of Mexico (GoM). More specifically, long-living anticyclonic Loop Current eddies (LCEs) are shed episodically from the Loop Current and propagate westward. T...

Fluorescence sensors mounted on unmanned underwater gliders open new ways of investigation to detect dissolved hydrocarbons in seawater. A glider was deployed for 20 days to monitor biogeochemical and physical signals associated with natural hydrocarbon seepages within the first 700 m in the Angolan waters. The glider was equipped with fluorometers...

In the framework of the European project ODYSSEA, the Moroccan Association leader of the Marine Observatory of Al Hoceima AGIR, has successfully performed two glider missions in the South Alboran Sea. The vehicle was a SeaExplorer glider (manufactured and commercialized by ALSEAMAR, France) equipped with a CTD probe (GPCTD, seabird) and a novel mic...

Surface chlorophyll concentrations inferred from satellite images suggest a strong influence of the mesoscale activity on biogeochemical variability within the oligotrophic regions of the Gulf of Mexico (GoM). More specifically, long-living anticyclonic Loop Current Eddies (LCEs) are shed episodically from the Yucatan Chanel and propagate westward....

Understanding the ocean's role in the global carbon cycle and its response to a changing environment is of crucial interest. The ocean is indeed known to be the only true net sink for anthropogenic carbon dioxide (CO2) and without this oceanic uptake, atmospheric CO2 would be significantly higher today than what is currently observed. The impact of...

Autonomous underwater gliders conduct seep surveys off Colombia Confirmed the presence of active petroleum systems ORENS PASQUERON DE FOMMERVAULT, ALSEAMAR EFRAÍN RODRÍGUEZ-RUBIO, and DANIEL RINCÓN-MARTÍNEZ, ICP-ECOPETROL S.A. HYDROCARBON SEEPS consist of small amounts of hydrocarbons being expelled from the seabed and reaching the water column. Se...

Test quality of glider mounted AD2CP current observations in the Northwestern Mediterranean (Ligurian) Sea using WMOP currents as a reference

In the framework of the survey conducted by ALSEMAR for ECOPETROL, four SeaExplorer gliders were mobilized to acquire continuous data from the 29th of August to the 7th of December 2019. This represents a large dataset of more than 90 days at sea for both oceanographic and O&G gliders, off the Guajira Peninsula (Colombian Caribbean Sea). Most innov...

As commonly observed in oligotrophic stratified waters, a subsurface (or deep) chlorophyll maximum (SCM) frequently characterizes the vertical distribution of phytoplankton chlorophyll in the Mediterranean Sea. Occurring far from the surface layer “seen” by ocean colour satellites, SCMs are difficult to observe with adequate spatio-temporal resolut...

Subsurface (or Deep) Chlorophyll a Maxima (SCMs) are frequently observed in stratified oligotrophic waters. They result from various mechanisms, e.g. photoacclimation of phytoplankton organisms or actual increase in phytoplankton carbon biomass. SCMs are difficult to observe with adequate spatio-temporal resolution. Hence their spatio-temporal dyna...

As commonly observed in oligotrophic stratified waters, a Subsurface (or Deep) Chlorophyll Maximum (SCM) frequently characterizes the vertical distribution of phytoplankton chlorophyll in the Mediterranean Sea. Occurring far from the surface layer seen by ocean color satellites, SCMs are difficult to observe with adequate spatio-temporal resolution...

We report on data from an oceanographic cruise, covering western, central and eastern parts of the Mediterranean Sea, on the French research vessel Tethys 2 in May 2015. This cruise was fully dedicated to the maintenance and the metrological verification of a biogeochemical observing system based on a fleet of BGC-Argo floats. During the cruise, a...

The seasonal and interannual variability of chlorophyll in the Gulf of Mexico open waters is studied using a three-dimensional coupled physical-biogeochemical model. A 5 years hindcast driven by realistic open-boundary conditions, atmospheric forcings, and freshwater discharges from rivers is performed. The use of recent in situ observations allowe...

The South Pacific Subtropical Gyre (SPSG) is a vast and remote area where large uncertainties on variability in phytoplankton biomass and production remain due to the lack of biogeochemical in situ observations. In such oligotrophic environments, ecosystems are predominantly controlled by nutrients depletion in surface waters. However, this oligotr...

Chlorophyll concentration is a key oceanic bio-geochemical variable. In the Gulf of Mexico (GOM), its distribution , which is mainly obtained from satellite surface observations and scarce in situ experiments, is still poorly understood. In 2011-2012, eight profiling floats equipped with biogeochemical sensors were deployed for the first time in th...

During winter 2012-2013, open-ocean deep convection which is a major driver for the thermohaline circulation and ventilation of the ocean, occurred in the Gulf of Lions (Northwestern Mediterranean Sea) and has been thoroughly documented thanks in particular to the deployment of several gliders, Argo profiling floats, several dedicated ship cruises,...

We report on data from an oceanographic cruise, covering western, central and eastern parts of the Mediterranean Sea, on the French research vessel Tethys 2 in May 2015. This cruise was fully dedicated to the maintenance and the metrological verification of a biogeochemical observing system based on a fleet of BGC-Argo floats. During the cruise, a...

The aim of this study is to understand the biogeochemical cycles of the northwestern Mediterranean Sea (NW Med), where a recurrent spring bloom related to dense water formation occurs. We used a coupled physical-biogeochemical model at high resolution to simulate realistic one-year period and analyze the nitrogen (N) and phosphorus (P) cycles. Firs...

In deep waters of Gulf of Mexico (GoM), historical in-situ profile data are relatively scarce. This results in a relative poor knowledge of the distribution and the dynamics of biogeochemical variables and also represents a limitation in developing numerical models. In 2011, the Bureau of Ocean Energy Management (BOEM, USA) deployed in the GoM seve...

The South Pacific subtropical gyre is a vast and remote area where biogeochemical in situ observations are scarce, leading to large uncertainties on phytoplankton biomass variability. Here, we investigated physical and biogeochemical observations issued from three Biogeochemical-Argo (BGC-Argo) profiling floats that collected data in the central So...

Chlorophyll concentration ([Cla]) is a key oceanic biogeochemical variable and the main proxy for phytoplankton biomass. However, in the Gulf of Mexico, the overall lack of data still prevent an accurate description of the [Cla] distribution and it is impossible to infer on a scale other than climatological. Consequently, mechanisms controlling the...

A neural network-based method (CANYON: CArbonate system and Nutrients concentration from hYdrological properties and Oxygen using a Neural-network) was developed to estimate water-column (i.e., from surface to 8,000 m depth) biogeochemically relevant variables in the Global Ocean. These are the concentrations of three nutrients [nitrate (NO3⁻), pho...

Biogeochemical modeling: revealing chlorophyll patterns in the deep Gulf of Mexico

Neural Network: an alternative method to estimate nutrient concentrations in the Gulf of Mexico?

Improve our understanding of the phytoplankton dynamics in the Gulf of Mexico thanks to the deployments of biogeochemical profiling floats

The North Western Mediterranean Sea exhibits recurrent and significant autumnal and spring phytoplankton blooms. The existence of these two blooms coincide with typical temperate dynamics. To determine the potential control of physical and biogeochemical factors on these phytoplankton blooms, data from a multiplatform approach (combining ships, Arg...

The Gulf of Mexico is a very productive environment and previous studies, mainly based on satellite observations, evidenced a strong seasonality in surface chlorophyll concentrations due to specific hydrologic and meteorological conditions (winter mixing associated to maximum concentrations and summer stratification characterized by annual minimum...

This document does NOT address the issue of nitrate quality control (either real-time or delayed mode). As a preliminary step towards that goal, this document seeks to ensure that all countries deploying floats equipped with nitrate sensors document the data and metadata related to these floats properly. We produced this document in response to act...

La Méditerranée est caractérisée par des concentrations en nutriments parmi les plus faibles au monde, et qui montrent des valeurs décroissantes d’ouest en est. A l’échelle climatologique, le bassin est dominé par un régime subtropical, à l’exception de certaines zones spécifiques, qui présentent une dynamique typique des régions tempérées. Malgré...

In 2013, as part of the French NAOS (Novel Argo Oceanic observing System) program, five profiling floats equipped with nitrate sensors (SUNA-V2) together with CTD and bio-optical sensors were deployed in the Mediterranean Sea. At present day, more than 500 profiles of physical and biological parameters were acquired, and significantly increased the...

The North Western Mediterranean Sea (NWM) combines, in a relatively small area, recurrent intense open-ocean deep convection events and significant phytoplankton spring blooms (in terms of spatial extent and of observed chlorophyll-a concentrations). However, the importance of the deep convection in structuration of spring blooms is still debated....

Seasonal variability of nutrient concentrations in the Mediterranean Sea: Contribution of Bio-Argo floats

In a context of growing urbanization of littoral areas and climate change, coastal protection is an issue of great concern. Alternative management solutions are needed to fight against beach erosion and marine submersion. Traditional coastal protection methods are progressively replaced by soft methods with fewer impacts on the environment. Artific...

Voyage of a profiling float: a scientific adventure told to young people

Variability of nutrient concentration profiles in relation to physical and biogeochemical processes: data from the dyfamed station (Ligurian Sea)

Monitoring of deep convection and phytoplancton bloom processes in the north western mediterranean sea using biogeochemical profilings floats

We present the latest results of our on-going closed-loop “end-to-end” numerical adaptive optics (AO) simulations concerning both a standard-AO and a three-star ground-layer AO system for a near-infrared 2-m class telescope at Dome C, Antarctica. We demonstrate that Dome C is an ideal site for wide-field AO-aided astronomy, define in details the A...