Nicolas Barrier

Nicolas Barrier
Institute of Research for Development (IRD) · UMR Marbec

PhD

About

45
Publications
13,751
Reads
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724
Citations
Additional affiliations
April 2017 - present
Institute of Research for Development (IRD)
Position
  • Research engineer in scientific calculation
September 2015 - present
OT-Med Labex
Position
  • Research Engineer in numerical modelling and scientific calculation
September 2014 - August 2015
Aix-Marseille Université
Position
  • Research Assistant

Publications

Publications (45)
Article
The yellow clam Mesodesma mactroides is a cool-water species that typifies sandy beaches of the Southwestern Atlantic Ocean (SAO), which embraces one of the strongest ocean warming hotspots. The region is influenced by the Rio de la Plata (RdlP), which represents a zoogeographic barrier that restricts its larval exchange. We investigated yellow cla...
Article
Full-text available
In face of global changes, projecting and mapping biodiversity changes are of critical importance to support management and conservation measures of marine ecosystems. Despite the development of a wide variety of ecosystem models capable of integrating an increasing number of ecological processes, most projections of climate-induced changes in mari...
Article
Full-text available
Hatchery programs are commonly used to enhance fishery stocks, while the efforts to minimize potential negative ecological impacts have grown in recent years. In China, Fenneropenaeus chinensis is a fast-growing, short-lived shrimp species with a high commercial value. F. chinensis fishery is heavily dependent on the hatchery program. We evaluated...
Article
Small-scale fisheries (SSFs) play a vital role in the sustainability of local economies. Migratory species moving into and out of an ecosystem may influence the dynamics of local fish communities and SSFs. We used the end-to-end model, OSMOSE-JZB (Object-oriented Simulator of Marine ecOSystEms), to evaluate the impacts of fishing and a migratory sh...
Article
Full-text available
Projections of climate change impacts on marine ecosystems have revealed long-term declines in global marine animal biomass and unevenly distributed impacts on fisheries. Here we apply an enhanced suite of global marine ecosystem models from the Fisheries and Marine Ecosystem Model Intercomparison Project (Fish-MIP), forced by new-generation Earth...
Preprint
Full-text available
Pelagic fish communities are shaped by bottom-up and top-down processes, transport by currents, and active swimming. However, the interaction of these processes remains poorly understood. Here, we use a regional implementation of the APex ECOSystem Model (APECOSM), a mechanistic model of the pelagic food web, to investigate these processes in the C...
Article
Natural floating objects (FOBs) have always been a major component of the habitat of pelagic species. Since the 1990s, the number of FOBs in the open ocean has increased greatly as a result of the introduction of fish aggregating devices (FADs) by the industrial tropical tuna purse seine vessels. These changes, and their potential impacts on the sp...
Article
Full-text available
Climate change is warming the ocean and impacting lower trophic level (LTL) organisms. Marine ecosystem models can provide estimates of how these changes will propagate to larger animals and impact societal services such as fisheries, but at present these estimates vary widely. A better understanding of what drives this inter-model variation will i...
Article
Full-text available
Extreme weather events affect coastal marine ecosystems. The increase in intensity and occurrence of such events drive modifications in coastal hydrology and hydrodynamics. Here, focusing on the winter period (from December to March), we investigated multi-decade (2000–2018) changes in the hydrological properties of the Bay of Brest (French Atlanti...
Preprint
Full-text available
Land forcing (water discharge, and nutrient loads) is reported as one of the major sources of uncertainty limiting the capacity of marine biogeochemical models. Runoff from rivers and coastal plains delivers significant amounts of nutrients to the Mediterranean Sea from agricultural activities and urban waste water. Several recent studies show that...
Article
Full-text available
The Mediterranean region has been shown to be particularly exposed to climate change, with observed trends that are more pronounced than the global tendency. In forecast studies based on a RCP 8.5 scenario, there seems to be a consensus that, along with an increase in temperature and salinity over the next century, a reduction in the intensity of d...
Article
Full-text available
The marine ecosystem off British Columbia (BC), Canada, has experienced various changes in the last two decades, including reduced lipid-rich zooplankton biomass, increased marine mammals, and deteriorated commercial fisheries, particularly those targeting pelagic species such as Pacific Herring (Clupea pallasii). Understanding how stressors intera...
Article
Full-text available
Earth System Models project that global climate change will reduce ocean net primary production (NPP), upper trophic level biota biomass and potential fisheries catches in the future, especially in the eastern equatorial Pacific. However, projections from Earth System Models are undermined by poorly constrained assumptions regarding the biological...
Chapter
Coastal marine ecosystems worldwide are not only highly affected by the effects of human activities, but also by the influence of natural climate variability and global climate change. However, it is still a challenge to assess the spatial and temporal scales at which forcings operate and their persistence over time, to determine the vulnerability...
Conference Paper
Full-text available
In recent studies, the Mediterranean region is once again identified as a region particularily sensitive to climate change, with recorded temperature and sea level rises during the last decades exceeding the mean variations recorded at global scale. Moreover, according to climate scenarios, there seems to be some consensus regarding the impact on c...
Article
Terrestrial plants seeds, spores and pollen are often dispersed by wind. Likewise, most eggs and larvae of marine organisms are dispersed by oceanic currents. It was historically believed that the spatial scale at which dispersal occurs was orders of magnitude smaller for plants than for fish. However, recent empirical estimates of seed and larval...
Article
The Mediterranean Sea (MS) is a semi-enclosed sea characterized by a zonal west-east gradient of oligotrophy, where microbial growth is controlled by phosphate availability in most situations. External inputs of nutrients including Gibraltar inputs, river inputs and atmospheric deposition are therefore of major importance for the biogeochemistry of...
Article
The Mediterranean Sea is one of the main hotspots of marine biodiversity in the world. The combined pressures of fishing activity and climate change have also made it a hotspot of global change amidst increasing concern about the worsening status of exploited marine species. To anticipate the impacts of global changes in the Mediterranean Sea, more...
Article
To investigate dispersal and connectivity between spawning and lagoon nursery habitats of the gilthead seabream, Sparus aurata, in the Gulf of Lions (northwestern Mediterranean Sea), we modeled the potential transport of the species' larvae between its supposed main spawning site in the region (the Planier Island) and two of its main local nursery...
Article
Full-text available
The Mediterranean Sea is now recognized as a hotspot of global change, ranking among the fastest warming ocean regions. In order to project future plausible scenarios of marine biodiversity at the scale of the whole Mediterranean basin, the current challenge is to develop an explicit representation of the multispecies spatial dynamics under the com...
Article
We investigate reference points for ecosystem indicators in support of an Ecosystem Approach to Fishery. In particular, we assess indicator capacity to detect when the Multispecies Maximum Sustainable Yield (MMSY) is reached, under a wide range of multispecies fishing strategies. The analysis was carried out using a simulation approach based on th...
Article
Full-text available
While the physical dimensions of climate change are now routinely assessed through multimodel intercomparisons, projected impacts on the global ocean ecosystem generally rely on individual models with a specific set of assumptions. To address these single-model limitations, we present standardized ensemble projections from six global marine ecosyst...
Preprint
The Mediterranean Sea is among the main hotspots of marine biodiversity in the world. Under combined pressures of fishing activities and climate change it has also become a hotspot of global change, with increased concern about the worsening status of marine exploited species. More integrated modelling approaches are needed to anticipate global cha...
Article
To facilitate the wider implementation of ecosystem modeling platforms and, thereby, to help advance ecosystem based fisheries management (EBFM) worldwide, tools delivering a large quantity of inputs to ecosystem models are needed. We developed a web application providing OSMOSE ecosystem models with values for trophic, growth and reproduction para...
Preprint
Full-text available
Climate change is shifting the abundance and distribution of marine species with consequences for ecosystem functioning, seafood supply, management and conservation. Several approaches for future projection exist but these have never been compared systematically to assess their variability. We conducted standardized ensemble projections including 6...
Code
Full-text available
Module containing multiple functions dedicated to Earth Scientits. - Calculation of monthly/daily climatologies/anomalies - Multi-taper spectral analysis - Masked Lambert Projection - Generation of fancy colormaps - NetCDF file manipulation - Lanczos and FFT filtering - And probably more to come
Presentation
In order to understand the paleo-variability of Saharo-Sahelian paleoprecipitation, which is recorded in the sedi- ments of Lake Chad situated in central Sahel, we use a modelling chain going from global climate to basin-scale hydrological model. Namely, climate model outputs for the Holocene, starting with the mid-Holocene (6ka) avail- able from t...
Article
The Northern Mediterranean Current is the return branch of the cyclonic circulation of the northwestern Mediterranean Sea. Because of geostrophic constraints, this warm and oligotrophic current is forced to flow westward along the continental slope of the Gulf of Lion. But, occasionally, it penetrates on the shelf and strongly impacts the local bio...
Article
In the mid 1990s, the North Atlantic subpolar gyre has shown a dramatic warming event that has been thoroughly investigated from observations and numerical simulations. Some studies suggest that it was due to an interannual, wind-driven weakening and shrinking of the gyre that facilitated the penetration of warm Atlantic Water, the weakening of the...
Article
There is now a strong scientific consensus that coastal marine systems of Western Europe are highly sensitive to the combined effects of natural climate variability and anthropogenic climate change. However, it still remains challenging to assess the spatial and temporal scales at which climate influence operates. While large-scale hydro-climatic i...
Article
Atmospheric weather regimes are a promising alternative to the modes of variability traditionally used to assess the impacts of atmospheric variability on the oceanic circulation in the North Atlantic. Indeed, they preserve the spatial asymmetry of the dominant mode of variability, the North Atlantic Oscillation. Using numerical simulations and tid...
Poster
Full-text available
In the mid-90s, the North-Atlantic subpolar gyre has shown a dramatic warming that has been attributed to changes in the large-scale atmospheric variability. This warming has often been attributed to an abrupt change in the North-Atlantic Oscillation, from highly positive in 1995 to highly negative in 1996. However, decadal prediction experiments s...
Article
A new framework is proposed for investigating the atmospheric forcing of North Atlantic Ocean circulation. Instead of using classical modes of variability, such as the North Atlantic Oscillation (NAO) or the east Atlantic pattern, the weather regimes paradigm was used. Using this framework helped avoid problems associated with the assumptions of or...
Article
A perceived limitation of z-coordinate models associated with spurious diapycnal mixing in eddying, frontal flow, can be readily addressed through appropriate attention to the tracer advection schemes employed. It is demonstrated that tracer advection schemes developed by Prather and collaborators for application in the stratosphere, greatly improv...
Article
Full-text available
Interannual variability of subtropical sea-surface-height (SSH) anomalies, estimated by satellite and tide-gauge data, is investigated in relation to wintertime daily North-Atlantic weather regimes. Sea-level anomalies can be viewed as proxies for the subtropical gyre intensity because of the intrinsic baroclinic structure of the circulation. Our r...
Presentation
Full-text available
The first mode of atmospheric variability in the North-Atlantic is the so-called North-Atlantic Oscillation (NAO), which, for its positive (negative) phase, corresponds to the simultaneous strengthening (weakening) of the Icelandic Low and Azores High. The NAO impact on ocean circulation has been thoroughly studied in literature; however, littlle i...
Poster
Full-text available
We investigate the climatic impact of opening the Central America Seaway (CAS) in a coupled atmosphere-ocean-sea-ice model. A highly idealized land distribution is employed in which two meridional barriers extend from the North Pole in to the southern hemisphere, thus dividing the ocean in to a large basin, a small basin and a circumpolar flow arou...
Poster
Full-text available
The evolution of the Atlantic Meridional Overturning Circulation (AMOC) is crucial to be estimated in the context of climate change because of its central role in Earth energy equilibrium. Coupled atmosphere-ocean models used so far in CMIPs suffer from large uncertainties associated with, among others, the misrepresentation of oceanic processes (d...

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Projects

Projects (3)
Project
SOMBEE: "Scenarios Of Marine Biodiversity and Evolution under Exploitation and climate change" Eco-evolutionary dynamics and their consequences for the sustainable exploitation of fish resources in the future www.sombee.org
Project
This project aims at developing a Python tool for the analysis and intercomparison of gridded ocean models. It allows to compute transport indexes and domain integrated budgets.
Project
Size-structured and multispecies model of fish community dynamics. Its current structure embeds the coupling with hydrodynamic and biogeochemical models (end-to-end model). key features: Trophic interactions are size-based. The whole life cycle of fish is modelled (migration, food-dependent growth, reproduction and mortality), with tracking of all life stages (from eggs to terminal age) in space and time. The model provides size-, age-, species-, trophic level-based indicators in output. Code source is open access: www.osmose-model.org https://github.com/osmose-model https://cran.r-project.org/web/packages/osmose/index.html