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  • 1
    Online Resource
    Online Resource
    Baroclinic tidal conversion: note on a paper of L.R.M. Maas
    Cambridge University Press (CUP) ; 2022
    In:  Journal of Fluid Mechanics Vol. 946 ( 2022-09-10)
    Details
    In: Journal of Fluid Mechanics, Cambridge University Press (CUP), Vol. 946 ( 2022-09-10)
    Abstract: Maas ( J. Fluid Mech. , vol. 684, 2011, pp. 5–24) showed that, for an oscillating two-dimensional barotropic tide flowing over sub-critical topography of compact support, some topographic forms existed that produced non-radiating baroclinic disturbances. The problem is related to ‘stealth’ and ‘cloaking’ problems. Here Maas's result is derived using a simpler approach, not involving complicated mappings, but formally restricted to perturbation topography. Wider results come from the discussion of nearly compact support topographic disturbances provided by Schwartz functions with weak high-wavenumber radiation and by exploiting both a known functional equation formulation and Fourier methods. The problem is extended to disturbances on uniform slopes. A variety of non-radiating topographies can be found, although they are mathematically delicate and unlikely to be found in nature. Topography with weak radiation at high wavenumber is a much wider class of structures. Application of these solutions would lie with the ability to estimate dissipation over and near the topography from motions observed at a distance.
    Type of Medium: Online Resource
    ISSN: 0022-1120 , 1469-7645
    URL: Article
    DOI: 10.1017/jfm.2022.637
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2022
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  • 2
    Online Resource
    Online Resource
    Inferring surface water equilibrium calcite δ 18 O during the last deglacial period from benthic foraminiferal records: Implications for ocean circulation
    American Geophysical Union (AGU) ; 2015
    In:  Paleoceanography Vol. 30, No. 11 ( 2015-11), p. 1470-1489
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 30, No. 11 ( 2015-11), p. 1470-1489
    Abstract: Inverse methods quantify information about past circulations from tracer proxies Benthic tracer records constrain surface properties where deep water is formed A set of oxygen isotope records does not diagnose deglacial circulation changes
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Issue
    URL: Article
    DOI: 10.1002/palo.v30.11
    DOI: 10.1002/2014PA002743
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2015
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  • 3
    Online Resource
    Online Resource
    Oceanic age and transient tracers: Analytical and numerical solutions
    American Geophysical Union (AGU) ; 2002
    In:  Journal of Geophysical Research Vol. 107, No. C6 ( 2002)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 107, No. C6 ( 2002)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2001JC000797
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
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  • 4
    Online Resource
    Online Resource
    How well does a 1/4° global circulation model simulate large‐scale oceanic observations?
    American Geophysical Union (AGU) ; 1996
    In:  Journal of Geophysical Research: Oceans Vol. 101, No. C11 ( 1996-11-15), p. 25779-25811
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 101, No. C11 ( 1996-11-15), p. 25779-25811
    Abstract: Numerical high‐resolution ocean general circulation models have experienced a revolutionary development during the last decade. Today they are run globally in realistic configuration with realistic surface boundary forcing. To fully use the results of those models in understanding various aspects of the ocean general circulation and to combine ocean observations with models (state estimation) in a manner consistent with the data and model dynamics, stringent model‐data comparisons are a necessary first step. In this paper a quantitative model‐data comparison is carried out for the global Parallel Ocean Climate Model (POCM), known also as the Semtner and Chervin model, with nominal lateral resolution of 1/4°. The focus is on various aspects of the simulated large‐scale circulation and their relation to the TOPEX/POSEIDON sea surface height (SSH) observations and World Ocean Circulation Experiment (WOCE) hydrography. Comparisons are made for (1) the global mean sea surface circulation and absolute slopes, (2) rms SSH variability and eddy kinetic energy, (3) the simulation of the observed seasonal cycle in SSH, (4) two‐dimensional frequency‐wavenumber spectra of the large‐scale fluctuations, as well as (5) the hydrography for WOCE sections. Recent improvements in external surface forcing fields including daily wind‐stress fields and sea surface heat fluxes lead to a significant improvement in the overall agreement of the simulated and observed large‐scale mean circulation and its variability. However, simulated amplitudes of variability remain low by about a factor of 2 to 4 over a broad spectral range, including the long wavelengths and periods. Both the causes and consequences of this low variability remain obscure.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/96JC01754
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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  • 5
    Online Resource
    Online Resource
    Global‐scale sea surface variability from combined altimetric and tide gauge measurements
    American Geophysical Union (AGU) ; 1991
    In:  Journal of Geophysical Research: Oceans Vol. 96, No. C8 ( 1991-08-15), p. 15053-15082
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 96, No. C8 ( 1991-08-15), p. 15053-15082
    Abstract: By correcting Geosat altimetric data for a set of line frequencies, and then doing a heavy average in space and time, a set of global maps of sea surface variability is produced over time intervals ranging from three months to two years. These maps are demonstrated to be consistent with the global network of tide gauges and sets of maps incorporating those data into the altimetric estimates are also produced. Tide gauge records too fragmentary for computation of a two‐year mean are employed by time differencing them. An estimate of the global difference of sea level change over one year, on very large space scales, shows the effects of the 1987 El Niño. The spherical harmonic coefficients employed in the computations are then used to estimate the full three‐dimensional frequency/wavenumber spectrum of surface circulation variability.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/91JC01127
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1991
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  • 6
    Online Resource
    Online Resource
    Large‐scale response of the ocean to atmospheric forcing at low frequencies
    American Geophysical Union (AGU) ; 1991
    In:  Journal of Geophysical Research: Oceans Vol. 96, No. C8 ( 1991-08-15), p. 15083-15092
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 96, No. C8 ( 1991-08-15), p. 15083-15092
    Abstract: Estimates of the time‐dependent sea surface topography on large space (500–2500 km) and time (30 days to 2 years) scales from altimetry and tide gauge data are compared with estimates of the surface meteorological fields (winds and pressure) on the same scales. The comparisons are made in the North Pacific and North Atlantic. Despite the obvious remaining high noise level in the sea surface topography, there is a significant correlation between the atmosphere and the time‐varying ocean circulation. These relations are quantified using simple multichannel regression models. With no time lags, typically 50% of the sea level variance can be described by the wind curl and divergence and the pressure field. Some areas produce classical static inverted barometer effects, but others suggest an amplified response. The motions are believed to characterize most of the water column.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/91JC01457
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1991
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    detail.hit.zdb_id: 161665-1
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    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
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  • 7
    Online Resource
    Online Resource
    Nonlinear and Nonstationary Signal Processing
    American Geophysical Union (AGU) ; 2002
    In:  Eos, Transactions American Geophysical Union Vol. 83, No. 16 ( 2002-04-16), p. 180-180
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 83, No. 16 ( 2002-04-16), p. 180-180
    Abstract: Stationary linear systems driven by Gaussian processes are the basic representations of time series used in the Earth sciences. A large body of literature has developed around these misleadingly simple models, which straddle statistics, optimization, control, probability theory, and related fields. That fundamental errors of inference are still made in the refereed literature is perhaps a testimony to the subtleties and confusion that arise when statistics meets the real geophysical world. A major journal devoted to modern climate studies recently felt compelled to publish a tutorial explaining the importance of avoiding aliasing errors when sampling meteorological variables; this subject was clearly understood 100 years ago.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2002EO000119
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
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  • 8
    Online Resource
    Online Resource
    Awards Presented at the Spring Meeting: Second Presentation: Maurice Ewing Medal to Henry M. Stommel by the American Geophysical Union and the U.S. Navy for Profound and Imaginative Contributions to Physical and Dynamical Oceanography
    American Geophysical Union (AGU) ; 1977
    In:  Eos, Transactions American Geophysical Union Vol. 58, No. 9 ( 1977-09), p. 866-868
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 58, No. 9 ( 1977-09), p. 866-868
    Abstract: The second recipient of the Maurice Ewing Medal of the American Geophysical Union is Henry M. Stommel. He was selected for his profound and imaginative contributions to physical and dynamical oceanography during the past generation. Probably the most truly creative physical oceanographer of his time, Stommel has made fundamental contributions to an astonishingly diverse range of problems, from microstructure and estuaries to the general circulation of the ocean. He has used almost all of the tools available to a physical scientist: theory, work at sea, and laboratory experiments. No other oceanographer has managed to combine the purely naturalist aspect of the field—geographical exploration at sea—with such revolutionary theoretical contributions.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/EO058i009p00866
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1977
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  • 9
    Online Resource
    Online Resource
    On sharp spectral lines in the climate record and the millennial peak
    American Geophysical Union (AGU) ; 2000
    In:  Paleoceanography Vol. 15, No. 4 ( 2000-08), p. 417-424
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 15, No. 4 ( 2000-08), p. 417-424
    Abstract: The existence of a narrow spectral line in the internal oscillations of the climate system would be a physical discovery of the first order. Thus the appearance of such a spectral peak, with a Q 〉 20 near 1500 years period, in the physical properties of the Greenland ice core is intriguing (bandwidth less than two cycles in 110,000 years). Apparently similar phenomena exist in some deep sea cores. It is shown, however, that the peak appears at precisely the period predicted as a simple alias of the seasonal cycle inadequately (under the Nyquist criterion) sampled at integer multiples of the common year. If this peak is therefore discounted, climate variability appears, as expected, to be a continuum process in the millennial band. More generally, however, aliasing of high frequencies must be a concern in any core analysis.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/1999PA000468
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2000
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  • 10
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    The global frequency‐wavenumber spectrum of oceanic variability estimated from TOPEX/POSEIDON altimetric measurements
    American Geophysical Union (AGU) ; 1995
    In:  Journal of Geophysical Research: Oceans Vol. 100, No. C12 ( 1995-12-15), p. 24895-24910
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 100, No. C12 ( 1995-12-15), p. 24895-24910
    Abstract: Two years of altimetric data from the TOPEX/POSEIDON spacecraft have been used to produce preliminary estimates of the space and time spectra of global variability for both sea surface height and slope. The results are expressed in terms of both degree variances from spherical harmonic expansions and in along‐track wavenumbers. Simple analytic approximations both in terms of piecewise power laws and Padé fractions are provided for comparison with independent measurements and for easy use of the results. A number of uses of such spectra exist, including the possibility of combining the altimetric data with other observations, predictions of spatial coherences, and the estimation of the accuracy of apparent secular trends in sea level.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/95JC01783
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1995
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    SSG: 16,13
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