A5028047337- Oceanographic and Atmospheric Processes
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Ocean Acidification Effects and Responses
- Global Energy and Sustainability Research
- Geological formations and processes
- Ocean Waves and Remote Sensing
- Marine Biology and Ecology Research
- Geological Studies and Exploration
- Tropical and Extratropical Cyclones Research
- Underwater Acoustics Research
- Diverticular Disease and Complications
- Hydrocarbon exploration and reservoir analysis
- Peatlands and Wetlands Ecology
- Polar Research and Ecology
- Climate change and permafrost
- Atmospheric chemistry and aerosols
- Congenital gastrointestinal and neural anomalies
- Groundwater and Isotope Geochemistry
- Arctic and Russian Policy Studies
- Underwater Vehicles and Communication Systems
University of Exeter
2013-2024
University of East Anglia
2002-2015
Norwich University
2014
Norwich Research Park
2013
Institut Pierre-Simon Laplace
2000
Sorbonne Université
2000
Institut de Recherche pour le Développement
2000
Centre National de la Recherche Scientifique
1998-2000
CEA Paris-Saclay
1994-1999
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1994-1999
Abstract The horizontal and vertical circulation of the Weddell Gyre is diagnosed using a box inverse model constructed with recent hydrographic sections including mobile sea ice eddy transports. gyre found to convey 42 ± 8 Sv (1 = 106 m3 s–1) across central Sea intensify 54 15 further offshore. This injects 36 13 TW heat from Antarctic Circumpolar Current gyre, exports 51 23 mSv freshwater, 1 as midlatitude Southern Ocean. gyre's overturning has an asymmetric double‐cell structure, in which...
Abstract The first direct estimate of the rate at which geostrophic turbulence mixes tracers across Antarctic Circumpolar Current is presented. computed from spreading a tracer released upstream Drake Passage as part Diapycnal and Isopycnal Mixing Experiment in Southern Ocean (DIMES). meridional eddy diffusivity, measure area spreads along an isopycnal Current, 710 ± 260 m2 s−1 1500-m depth. based on extrapolation tracer-based diffusivity using output numerical one-twentieth degree model...
Small-scale turbulent mixing drives the upwelling of deep water masses in abyssal ocean as part global overturning circulation
The acknowledgement of the importance small-scale turbulent mixing for redistribution heat, nutrients and suspended matter in ocean has led to renewed interest breaking internal waves at underwater topography. This follows from observations that turbulence intensity increases interior seafloor. As two-dimensional models require reduction buoyancy flux vicinity seafloor allow up-welling flows, question is how thin such a layer reduced above can be. From an observational study this subject, we...
Abstract Understanding ocean excess heat uptake is crucial for assessing climate warming, yet uncertainties remain about its history and redistribution. Here, we reconstruct content change along the 25°N Atlantic hydrographic section assess spatiotemporal origin fate. We show that delayed response of below 700 m to sea surface temperature contribute 62% full depth warming at this latitude 1850–2018, falling 35% 1975–2018 when anthropogenic in upper accelerated. The regional fluctuations...
Abstract The waters of the Weddell‐Scotia Confluence (WSC) lie above rugged topography South Scotia Ridge in Southern Ocean. Meridional exchanges across WSC transfer water and tracers between Antarctic Circumpolar Current (ACC) to north subpolar Weddell Gyre south. Here, we examine role topographic interactions mediating these exchanges, modifying transferred. A case study is presented using data from a free‐drifting, intermediate‐depth float, which circulated anticyclonically over Discovery...
The distribution of turbulent diapycnal mixing in the Nordic seas is mapped from observations internal wave density and velocity fine structure. uppermost 500–1500 m host two distinct regimes. In eastern basins, diffusivity ( K ρ ) straddles 10 −5 2 s −1 , whereas weakly stratified Greenland Boreas basins it raised by an order magnitude. Below ∼2000 m, low stratification associated with intense across seas, diffusivities range 3 × −4 –10 −2 . These rates agree within uncertainties three...
Abstract We use an ocean general circulation model and its adjoint to analyze the causal chain linking sea surface buoyancy anomalies in Labrador Sea variability deep branch of Atlantic meridional overturning (AMOC) on inter-annual timescales. Our study highlights importance North Current (NAC) for north-to-south connectivity AMOC transport Lower Deep Water (LNADW). identify two mechanisms that allow impact velocities LNADW layer. The first mechanism involves a passive advection from towards...
<title>Abstract</title> Small-scale turbulent mixing drives the upwelling of deep water masses in abyssal ocean as part global overturning circulation (Wunsch & Ferrari 2004). However, processes leading to and pathways through which this occurs remain insufficiently understood. Recent observational theoretical work suggests that may be focused bottom boundary layers on ocean’s sloping seafloor; however, direct evidence is lacking (Ledwell et al. 2000, St. Laurent 2001, 2016, de Lavergne...
The physical and biogeochemical components of nutrients inorganic carbon distributions along WOCE line A14 are objectively separated by means a constrained least‐squares regression analysis the mixing eastern South Atlantic water masses. Contrary to previous approaches, essentially devoted intricate circulation, this work is focused on effects circulation biogeochemistry, with special emphasis stoichiometry rate mineralization processes. Combination nutrient apparent CFC‐age anomalies,...
We explore historical variability in the volume of Labrador Sea Water (LSW) using ECCO, an ocean state estimate configuration Massachusetts Institute Technology general circulation model (MITgcm). The model&#8217;s adjoint, a linearization MITgcm, is set up to output lagged sensitivity watermass surface boundary conditions. This allows us reconstruct evolution LSW over recent decades wind stress, heat, and freshwater fluxes. Each these conditions contributes significantly that we...
Abstract. We explore historical variability in the volume of Labrador Sea Water (LSW) using ECCO, an ocean state estimate configuration Massachusetts Institute Technology general circulation model (MITgcm). The model's adjoint, a linearization MITgcm, is set up to output lagged sensitivity water mass surface boundary conditions. This allows us reconstruct evolution LSW over recent decades wind stress, heat, and freshwater fluxes. Each these conditions contributes significantly that we...