A5005879095- Oceanographic and Atmospheric Processes
- Climate variability and models
- Marine and coastal ecosystems
- Meteorological Phenomena and Simulations
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Geophysics and Gravity Measurements
- Tropical and Extratropical Cyclones Research
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Ocean Waves and Remote Sensing
- Radioactive contamination and transfer
- Marine and environmental studies
- Marine Biology and Ecology Research
- Geological and Geophysical Studies
- Isotope Analysis in Ecology
- Ocean Acidification Effects and Responses
- Distributed and Parallel Computing Systems
- Microbial Community Ecology and Physiology
- Marine and fisheries research
- Geological Studies and Exploration
- Aquatic Ecosystems and Phytoplankton Dynamics
- Global Energy and Sustainability Research
- Geological Modeling and Analysis
- Plasma Diagnostics and Applications
NSF National Center for Atmospheric Research
2015-2024
Climate and Global Dynamics Laboratory
2010-2024
U.S. National Science Foundation
2024
University of Colorado Boulder
1999-2023
University of Hawaiʻi at Mānoa
2019-2022
Ames Research Center
2022
National Aeronautics and Space Administration
2022
University of Hawaii System
2019
Japan Agency for Marine-Earth Science and Technology
2019
Pacific International Center for High Technology Research
2019
The GRACE satellite mission, scheduled for launch in 2001, is designed to map out the Earth's gravity field high accuracy every 2–4 weeks over a nominal lifetime of 5 years. Changes are caused by redistribution mass within Earth and on or above its surface. will thus be able constrain processes that involve redistribution. In this paper we use output from hydrological, oceanographic, atmospheric models estimate variability (i.e., geoid) due those sources. We develop method constructing...
Experiments with a low resolution, primitive equation ocean general circulation model idealized basin geometry and surface forcing have been carried out in order to identify the processes controlling climatically important aspects of circulation. Emphasis was placed on sensitivity solutions magnitude vertical diffusivity. Scaling arguments suggest, numerical experiments confirm, that are most sensitive magnitudes wind stress curl For small diffusivity, dominates solution. The scale...
In this paper an initial analysis of 0.1° simulation the North Atlantic Ocean using a level-coordinate ocean general circulation model forced with realistic winds covering period 1985–96 is presented. Results are compared to sector global 0.28° similar surface forcing and variety satellite in situ observations. The shows substantial improvements both eddy variability time-mean previous eddy-permitting simulations resolutions range 1/2°–1/6°. resolution finer than zonal-mean first baroclinic...
Abstract High‐resolution global climate modeling holds the promise of capturing planetary‐scale modes and small‐scale (regional sometimes extreme) features simultaneously, including their mutual interaction. This paper discusses a new state‐of‐the‐art high‐resolution Community Earth System Model (CESM) simulation that was performed with these goals in mind. The atmospheric component at 0.25° grid spacing, ocean 0.1°. One hundred years “present‐day” were completed. Major results annual mean...
Diapycnal mixing plays a primary role in the thermodynamic balance of ocean and, consequently, oceanic heat and carbon uptake storage. Though observed rates are on average consistent with values required by inverse models, recent attention has focused dramatic spatial variability, spanning several orders magnitude, both upper deep ocean. Away from boundaries, spatio-temporal patterns largely driven geography generation, propagation dissipation internal waves, which supply much power for...
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...
Abstract The emerging picture of frontal scale air–sea interaction derived from high-resolution satellite observations surface winds and sea temperature (SST) provides a unique opportunity to test the fidelity coupled climate simulations. Initial analysis output suite Community Climate System Model (CCSM) experiments indicates that characteristics ocean–atmosphere interaction, such as positive correlation between SST wind stress, are realistically captured only when ocean component is eddy...
This paper describes the global ocean component of NCAR Climate System Model. New parameterizations effects mesoscale eddies and upper-ocean boundary layer are included. Numerical improvements include a third-order upwind advection scheme elimination artificial North Pole island in original MOM 1.1 code. Updated forcing fields used to drive ocean-alone solution, which is integrated long enough so that it equilibrium. The transports potential temperature salinity distributions compared with...
Abstract The Community Climate System Model, version 4 (CCSM4) is used to assess the climate impact of wind-generated near-inertial waves (NIWs). Even with high-frequency coupling, CCSM4 underestimates strength NIWs, so that a parameterization for NIWs developed and included into CCSM4. Numerous assumptions enter this parameterization, core which NIW velocity signal detected during model integration, amplified in shear computation ocean surface boundary layer module. It found deepen mixed by...
Abstract It has traditionally been thought that midlatitude sea surface temperature (SST) variability is predominantly driven by variations in air–sea heat fluxes (SHFs) associated with synoptic weather variability. Here it shown regions marked the highest climatological SST gradients and SHF loss to atmosphere, at monthly longer time scales internal ocean processes, termed here “oceanic weather.” This within context of an energy balance model coupled interaction includes both stochastic...
Abstract A key question in climate modeling is to what extent sea surface temperature and upper-ocean heat content are driven passively by air–sea fluxes, as opposed forcing ocean dynamics. This paper investigates the using a model at different resolutions, observations, for monthly variability. At grid scale high-resolution with resolved mesoscale eddies, dynamics (i.e., flux convergence) dominates upper 50 m variability over most of globe. For deeper depths integration 400 m, almost...
Abstract A traditional view is that the ocean outside of tropics responds passively to atmosphere forcing, which implies air–sea heat fluxes are mainly driven by variability. This paper tests this viewpoint using state-of-the-art turbulent flux observational analyses and a climate model run at different resolutions. It found in midlatitude frontal zones variability not predominantly variations but instead forced sea surface temperature (SST) arising from intrinsic oceanic Meanwhile most...
Horizontal momentum flux in a global ocean climate model is formulated as an anisotropic viscosity with two spatially varying coefficients. This friction can be made purely dissipative, does not produce unphysical torques, and satisfies the symmetry conditions required of Reynolds stress tensor. The primary design criteria are to have at values appropriate for parameterization missing mesoscale eddies wherever possible use other only where by numerics. These viscosities control numerical...
The spatial and temporal properties of zonally coherent jet‐like structures found in high resolution ocean models is examined. We focus on the Pacific Ocean. find jets are not very sensitive to model configuration. Distinct differences persistence vertical structure poleward 30°N S compared with those tropics. make a quantitative comparison between meridional scale Rhines scale. local scaling applies that horizontal variation consistent variations
Results are presented from a century-long 1/10° global ocean simulation that included suite of age-related passive tracers. In particular, an ensemble five Boundary Impulse Response functions (BIRs, which statistically related to the more fundamental Transit Time Distributions, TTDs) was quantify character TTD when mesoscale eddies explicitly simulated rather than parameterized. We also seek characterize level variability in water mass ventilation timescales arising eddy motions. The...
Abstract The Southern Ocean’s Antarctic Circumpolar Current (ACC) and meridional overturning circulation (MOC) response to increasing zonal wind stress is, for the first time, analyzed in a high-resolution (0.1° ocean 0.25° atmosphere), fully coupled global climate simulation using Community Earth System Model. Results from 20-yr perturbation experiment, where Hemisphere is increased by 50% south of 30°S, show only marginal changes mean ACC transport through Drake Passage—an increase 6%...