A5032720514- Oceanographic and Atmospheric Processes
- Climate variability and models
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Tropical and Extratropical Cyclones Research
- Meteorological Phenomena and Simulations
- Ocean Waves and Remote Sensing
- Geological formations and processes
- Geological Studies and Exploration
- Fluid Dynamics and Turbulent Flows
- Geophysics and Gravity Measurements
- Reservoir Engineering and Simulation Methods
- Marine and fisheries research
- Aquatic and Environmental Studies
- Marine and environmental studies
- Cryospheric studies and observations
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Advanced Mathematical Theories and Applications
- Simulation Techniques and Applications
- Hydrocarbon exploration and reservoir analysis
- Geomagnetism and Paleomagnetism Studies
- Geological and Geophysical Studies
Woods Hole Oceanographic Institution
2016-2025
University of Delaware
2021
Utrecht University
2020
Delft University of Technology
2020
Marine and Freshwater Research Institute
2019
Johns Hopkins University
2019
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2019
University of Oslo
2018
University of Bergen
2018
Bjerknes Centre for Climate Research
2018
Parametric representations of oceanic geostrophic eddy transfer heat and salt are studied ranging fromhorizontal diffusion to the more physically based approaches Green Stone (GS) Gent McWilliams(GM). The authors argue for a representation that combines best aspects GS GM: coefficientsthat vary in space time manner depends on large-scale density fields adoption atransformed Eulerian mean formalism (GM). Recommendations upon two-dimensional (zonally orazimuthally averaged) model with...
The Community Climate System Model (CCSM) has been created to represent the principal components of climate system and their interactions. Development applications model are carried out by U.S. research community, thus taking advantage both wide intellectual participation computing capabilities beyond those available most individual institutions. This article outlines history CCSM, its current capabilities, plans for future development applications, with goal providing a summary useful...
The Bermuda station "S" time series has been used to define the variability of subtropical mode water (STMW) from 1954 1995. This record, which shows decadal at a nominal period about 12–14 yr, as baseline for seeking correlation with large-scale atmospheric forcing and north–south excursions Gulf Stream position defined by subsurface temperature 200-m depth. A common 1954–89 inclusive, data sources, high degree among STMW potential vorticity (PV), position, (buoyancy flux, SST, sea level...
Abstract The mean structure and time-dependent behavior of the shelfbreak jet along southern Beaufort Sea, its ability to transport properties into basin interior via eddies are explored using high-resolution mooring data an idealized numerical model. analysis focuses on springtime, when weakly stratified winter-transformed Pacific water is being advected out Chukchi Sea. When winds weak, observed bottom trapped with a low potential vorticity core has maximum velocities O(25 cm s−1) eastward...
The subduction of water at upper ocean fronts driven by internal instabilities is investigated. A simple analytic model which assumes conservation potential density and vorticity used to characterize the expected structure subducted parcels as a function surface layer depth length scale parcel. Parcels from deep will be characterized anomalously low anticyclonic circulation, while shallow layers result in with high cyclonic circulation. nonlinear isopycnal primitive equation demonstrate how...
The properties of watermass transformation and the thermohaline circulation in marginal seas with topography subject to a spatially uniform net surface cooling are discussed. heat loss within sea is ultimately balanced by lateral advection from open ocean narrow boundary current that flows cyclonically around basin. Heat interior offset eddy fluxes originating current. objectives this study understand better what controls density waters formed sea, temperature outflowing waters, amount...
Abstract The overturning and horizontal circulations of the Labrador Sea are deduced from a composite vertical section across basin. data come late-spring/early-summer occupations World Ocean Circulation Experiment (WOCE) AR7W line, during years 1990–97. This time period was chosen because it corresponded to intense wintertime convection—the deepest densest in historical record—suggesting that North Atlantic meridional circulation (MOC) would be maximally impacted. geostrophic velocity...
Abstract Revolutionary observational arrays, together with a new generation of ocean and climate models, have provided intriguing insights into the Atlantic Meridional Overturning Circulation (AMOC) over last two decades. Theoretical models also changed our view AMOC, providing dynamical framework for understanding observations results complex models. In this paper we review recent advances in conceptual processes maintaining AMOC. We discuss theoretical that address issues such as interplay...
Abstract Recently, the Beaufort Gyre has accumulated over 20,000 km 3 of freshwater in response to strong anticyclonic atmospheric winds that have prevailed gyre for almost two decades. Here we explore key physical processes affecting accumulation and release within an idealized eddy‐resolving model Gyre. We demonstrate a realistic halocline can be achieved when its deepening tendency due Ekman pumping is counteracted by cumulative action mesoscale eddies. Based on this balance, derive...
Over a large range of Rossby and Froude numbers, we investigate the dynamics initially balanced decaying turbulence in shallow rotating fluid layer. As case incompressible two-dimensional turbulence, coherent vortex structures spontaneously emerge from random flow. However, owing to presence free surface, wealth new phenomena appear shallow-water system. The upscale energy cascade, common strongly flows, is arrested by finite deformation radius. Moreover, contrast near-geostrophic dynamics,...
The outflow through Denmark Strait shows remarkable mesoscale variability characterized by the continuous formation of intense cyclones just south sill. These have a diameter about 30 km and clear signatures at sea surface in currents measured near bottom. They remnant Arctic Intermediate Water (AIW) their core. authors' hypothesis is that these are formed stretching high potential vorticity (PV) water column outflows Strait. light, upper layer outflow, East Greenland Current, remains on...
Stommel argued that the seasonal cycle leads to a bias in coupling between surface mixed layer and main thermocline of ocean. He suggested "demon" operated effectively only allowed fluid at end winter pass from into thermocline. In this study, Stommel's hypothesis is examined using diagnostics time-dependent coupled layer-primitive equation model North Atlantic (CME). The influence on properties investigated two methods. first, rate timing subduction diagnosed kinematic methods 1° resolution...
An idealized model is used to study the restratification of Labrador Sea after deep convection, with emphasis on role boundary current eddies shed near west coast Greenland. The carry warm, buoyant Irminger Current water into interior. For a realistic end-of-winter state, it shown that these are efficient in restratifying convected mass interior Sea. In addition, demonstrated can balance significant portion atmospheric heat loss and thus play an important for watermass transformation
The circulation and water mass transformation in a regional ocean‐ice model of the Chukchi Sea are discussed. has horizontal resolution O (4 km), is forced by fluxes derived from daily NCEP reanalysis fields, seasonally varying transport, temperature, salinity imposed at Bering Strait. Many observed characteristics mean seasonal cycle reproduced. discussion focuses on: branching inflow transport into pathways following Herald Canyon, Central Channel, Alaskan coast; pattern ice melt;...
Abstract The influences of strong gradients in sea surface temperature on near-surface cross-front winds are explored a series idealized numerical modeling experiments. atmospheric model is the Naval Research Laboratory Coupled Ocean–Atmosphere Mesoscale Prediction System (COAMPS) model, which fully coupled to Regional Ocean Modeling (ROMS) ocean model. A idealized, two-dimensional calculations carried out wind blows from warm-to-cold side or cold-to-warm an initially prescribed front....
Warm subtropical-origin Atlantic water flows northward across the Greenland-Scotland Ridge into Nordic Seas, where it relinquishes heat to atmosphere and gradually transforms dense Atlantic-origin water. Returning southward along east Greenland, this mass is situated beneath a layer of cold, fresh surface sea ice. Here we show, using measurements from autonomous ocean gliders, that was re-ventilated while transiting western Iceland Sea during winter. This re-ventilation recent phenomenon...
Abstract The halocline of the Beaufort Gyre varies significantly on interannual to decadal time scales, affecting freshwater content (FWC) Arctic Ocean. This study explores role eddies in Ekman-driven gyre variability. Following transformed Eulerian-mean paradigm, authors develop a theory that links FWC variability stability large-scale gyre, defined as inverse its equilibration time. theory, verified with eddy-resolving numerical simulations, demonstrates is explicitly controlled by...