A5045320508- Oceanographic and Atmospheric Processes
- Climate variability and models
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Marine Biology and Ecology Research
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Meteorological Phenomena and Simulations
- Cryospheric studies and observations
- Geological Studies and Exploration
- Geophysics and Gravity Measurements
- Marine and environmental studies
- Hydrocarbon exploration and reservoir analysis
- Ionosphere and magnetosphere dynamics
- Reservoir Engineering and Simulation Methods
- Geological and Geophysical Studies
- Climate Change and Health Impacts
- Maritime and Coastal Archaeology
- Archaeology and ancient environmental studies
- Plant Water Relations and Carbon Dynamics
- Environmental DNA in Biodiversity Studies
- Marine Ecology and Invasive Species
- Coral and Marine Ecosystems Studies
Ifremer
2012-2024
Laboratory for Ocean Physics and Satellite Remote Sensing
2020-2024
Centre National de la Recherche Scientifique
2012-2024
Institut de Recherche pour le Développement
2012-2024
Université de Bretagne Occidentale
2010-2024
Institut Universitaire Européen de la Mer
2019-2024
Laboratoire d’Études en Géophysique et Océanographie Spatiales
2024
National Oceanography Centre
2014-2019
Institut Océanographique
2012-2019
Abstract. Global mean sea level is an integral of changes occurring in the climate system response to unforced variability as well natural and anthropogenic forcing factors. Its temporal evolution allows (e.g., acceleration) be detected one or more components. Study sea-level budget provides constraints on missing poorly known contributions, such unsurveyed deep ocean still uncertain land water component. In context World Climate Research Programme Grand Challenge entitled Regional Sea Level...
The Argo Program has been implemented and sustained for almost two decades, as a global array of about 4000 profiling floats. provides continuous observations ocean temperature salinity versus pressure, from the sea surface to 2000 dbar. successful installation its innovative data management system arose opportunistically combination great scientific need technological innovation. Through system, fundamental physical with broad societally-valuable applications, built on cost-efficient robust...
Abstract. Human-induced atmospheric composition changes cause a radiative imbalance at the top of atmosphere which is driving global warming. This Earth energy (EEI) most critical number defining prospects for continued warming and climate change. Understanding heat gain system – particularly how much where distributed fundamental to understanding this affects ocean, land; rising surface temperature; sea level; loss grounded floating ice, are concerns society. study Global Climate Observing...
Abstract. The Earth climate system is out of energy balance, and heat has accumulated continuously over the past decades, warming ocean, land, cryosphere, atmosphere. According to Sixth Assessment Report by Working Group I Intergovernmental Panel on Climate Change, this planetary multiple decades human-driven results in unprecedented committed changes system, with adverse impacts for ecosystems human systems. inventory provides a measure imbalance (EEI) allows quantifying how much as well...
Abstract Global and regional ocean warming deeper than 2000 m is investigated using 35 years of sustained repeat hydrographic survey data starting in 1981. The global long‐term temperature trend below m, representing the time period 1991–2010, equivalent to a mean heat flux 0.065 ± 0.040 W −2 applied over Earth's surface area. strongest rates are found abyssal layer (4000–6000 m), which contributes one third total uptake with largest contribution from Southern Pacific Oceans. A similar...
The early twenty-first century’s warming trend of the full-depth global ocean is calculated by combining analysis Argo (top 2000 m) and repeat hydrography into a blended observing system. surface-to-bottom temperature change over last decade sustained observation equivalent to heat uptake 0.71 ± 0.09 W m −2 applied surface Earth, 90% it being found above 2000-m depth. authors decompose pointwise changes in isopycnal depth (heave) along an (spiciness) describe mechanisms controlling...
Abstract. The strength of the Atlantic meridional overturning circulation (AMOC) at 26∘ N has now been continuously measured by RAPID array over period April 2004–September 2018. This record provides unique insight into variability large-scale ocean circulation, previously only sporadic snapshots basin-wide transport from hydrographic sections. continuous measurements have unveiled striking on timescales days to a decade, driven largely wind forcing, contrasting with previous expectations...
Abstract The Indian Ocean Observing System (IndOOS), established in 2006, is a multinational network of sustained oceanic measurements that underpin understanding and forecasting weather climate for the region beyond. Almost one-third humanity lives around Ocean, many countries dependent on fisheries rain-fed agriculture are vulnerable to variability extremes. alone has absorbed quarter global heat uptake over last two decades fate this its impact future change unknown. Climate models...
Abstract The Subpolar North Atlantic is known for rapid reversals of decadal temperature trends, with ramifications encompassing the large-scale meridional overturning and gyre circulations, Arctic heat mass balances, or extreme continental weather. Here, we combine datasets derived from sustained ocean observing systems (satellite in situ), idealized observation-based modelling (advection-diffusion a passive tracer), machine learning technique (ocean profile clustering) to document explain...
Abstract We present an observation‐based heat budget analysis for seasonal and interannual variations of ocean content ( H ) in the mixed layer mld full‐depth tot ). Surface flux estimates are combined using a novel Kalman smoother‐based method. Regional contributions from transport convergences inferred as residual dominant drivers quantified time scales. find that non‐Ekman processes dominate equatorial oceans regions strong currents substantial eddy activity. In these locations, surface...
Abstract. The Atlantic Meridional Overturning Circulation (AMOC) impacts ocean and atmosphere temperatures on a wide range of temporal spatial scales. Here we use observational datasets to validate model-based inferences the usefulness thermodynamics theory in reconstructing AMOC variability at low frequency, further build this reconstruction provide prediction near-future (2019–2022) North state. An easily observed surface quantity – rate warm cold transformation water masses high latitudes...
Major changes are occurring across the North Atlantic climate system, including in atmosphere, ocean and cryosphere, many observed unprecedented instrumental records. As directly affect air quality of surrounding continents, it is important to fully understand how why taking place, not least predict region will change future. To this end, article characterizes recent region, especially period 2005–2016, different aspects system including: atmospheric circulation; composition; clouds...
Abstract The study of energy flows in the Earth system is essential for understanding current climate change. To understand how accumulating and being distributed within system, an updated reconstruction fluxes at top atmosphere, surface atmosphere derived from observations presented. New satellite ocean data are combined with improved methodology to quantify recent variability meridional land heat transports since 1985. A global net imbalance found increase 0.10 ± 0.61 W m −2 over 1985–1999...
The Atlantic Meridional Overturning Circulation (AMOC) is a key component of the Earth's climate. However, there are few long series observations AMOC and study mechanisms driving its variability depends mainly on numerical simulations. Here, we use four ocean circulation estimates produced by different data-driven approaches increasing complexity to analyze seasonal decadal subpolar across Greenland–Portugal OVIDE line since 1993. We decompose MOC strength into velocity-driven due...
The steady-state buoyancy budget underpinning the Atlantic Meridional Overturning Circulation (AMOC) implies a balance between surface-forced and mixing-driven transformation of North Deep Water (NADW) its meridional export. Here, we employ climatology ocean temperature salinity data, contemporary Deep-Argo array, an atmospheric reanalysis to assess this in subpolar Nordic Seas over interannual, decadal, bidecadal timescales. We quantify residual - rate water mass volume change role budget....
The Atlantic Meridional Overturning Circulation (AMOC) is a key component of the Earth’s climate. According to last IPCC reports, it expected weaken as mean atmosphere temperature increases, with considerable impact around world. There are few long time series observations AMOC, and study mechanisms driving its variability depends mainly on numerical simulations. Understanding seasonal decadal required properly detect trend in observed AMOC timeseries. Here, we use four ocean circulation...
Abstract. In a sensitivity experiment, an eddy-permitting ocean general circulation model is forced with realistic freshwater fluxes from the Greenland Ice Sheet, averaged for period 1991–2000. The are obtained mass balance ice sheet, ERA-40 reanalysis dataset. flux distributed around as additional term in prescribed runoff, representing seasonal melting of sheet and fixed year-round iceberg calving flux, 8.5 years. By adding geographical distribution seasonality, experiment designed to...
The origin and formation of the Subpolar Mode Water (SPMW) located over Reykjanes Ridge in North‐Atlantic Ocean variability its properties period 1966–2004 are investigated through use a global eddy‐permitting (1/4°) ocean/sea‐ice model Lagrangian analysis tool. SPMW is fed by subtropical subpolar waters advected branches Current. acquires when source enter winter mixed layer Iceland Basin. temperature mainly explained variations relative contributions water transports to total transport....
Abstract The vertical structure of temperature trends in the northeastern Atlantic (NEA) is investigated using a blend Argo and hydrography data. representativeness sparse sampling basin mean assessed numerical model. Between 2003 2013, NEA underwent strong surface cooling (0–450 m) significant warming at intermediate deep levels (1000 m to 3000 that followed trend observed between 1988 2003. During 2003–2013, gyre‐specific changes are found upper 1000 (warming subtropical subpolar gyres,...
Abstract We construct a novel framework to investigate the uncertainties and biases associated with estimates of deep ocean temperature change from hydrographic sections demonstrate this in an eddy‐permitting model. Biases observations arise due sparse spatial coverage (few basin), low frequency occupations (typically 5–10 years apart), mismatches between time period interest span occupations, seasonal relating practicalities sampling during certain times year. Between 1990 2010, modeled...