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  • 1
    Online Resource
    Online Resource
    Mechanisms of the meridional heat transport in the Southern Ocean
    Springer Science and Business Media LLC ; 2010
    In:  Ocean Dynamics Vol. 60, No. 4 ( 2010-8), p. 791-801
    Details
    In: Ocean Dynamics, Springer Science and Business Media LLC, Vol. 60, No. 4 ( 2010-8), p. 791-801
    Type of Medium: Online Resource
    ISSN: 1616-7341 , 1616-7228
    URL: Article
    DOI: 10.1007/s10236-010-0288-0
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2010
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    SSG: 14
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  • 2
    Online Resource
    Online Resource
    The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height
    American Meteorological Society ; 2012
    In:  Journal of Physical Oceanography Vol. 42, No. 12 ( 2012-12-01), p. 2229-2233
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 42, No. 12 ( 2012-12-01), p. 2229-2233
    Abstract: The wavenumber spectrum of sea surface height (SSH) observed by satellite altimetry was analyzed by Xu and Fu. The spectral shape in the wavelength range of 70–250 km was approximated by a power law, representing a regime governed by geostrophic turbulence theories. The effects of altimeter instrument noise were assumed insignificant at wavelengths longer than 70 km. The authors reexamined the assumption in the study. Using nearly simultaneous observations made by Jason-1 and Jason-2 during their cross-calibration phase, this study found that the white noise level of altimetry measurement was best estimated from the spectral values at wavelengths from 25 to 35 km. After removing a white noise level based on such estimate from the SSH spectrum, the spectral slope values changed significantly over most of the oceans. A key finding is that the spectral slopes are generally steeper than k−2 (k is wavenumber) poleward of the 20° latitudes, where flatter spectral slopes in some regions have previously caused problems for dynamic interpretations. The new results indicate that the spectral slopes in the core regions of the major ocean current systems have values between the original geostrophic turbulence theory and the surface quasigeostrophic theory. The near k−4 spectrum suggests that the sea surface height variability at these wavelengths in the high eddy energy regions might be governed by frontogenesis.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/JPO-D-12-0106.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2012
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  • 3
    Online Resource
    Online Resource
    Global Variability of the Wavenumber Spectrum of Oceanic Mesoscale Turbulence
    American Meteorological Society ; 2011
    In:  Journal of Physical Oceanography Vol. 41, No. 4 ( 2011-04-01), p. 802-809
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 41, No. 4 ( 2011-04-01), p. 802-809
    Abstract: The wavenumber spectra of sea surface height from satellite altimeter observations have revealed complex spatial variability that cannot be explained by a universal theory of mesoscale turbulence. Near the edge of the core regions of high eddy energy, agreement is observed with the prediction of the surface quasigeostrophic (SQG) turbulence theory, which has fundamental differences from that of the traditional quasigeostrophic (QG) turbulence theory. In the core regions of high eddy energy, the spectra are consistent with frontogenesis that is not fully accounted for by the SQG theory. However, the observations in the vast ocean interior of low eddy energy exhibit substantial differences from the predictions of existing theories of oceanic mesoscale turbulence. The spectra in these regions may reflect the ocean’s response to short-scale atmospheric forcing and air–sea interaction. The observations presented in this paper serve as a test bed for new theories and ocean general circulation models.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/2010JPO4558.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2011
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  • 4
    Online Resource
    Online Resource
    On the Transition from Profile Altimeter to Swath Altimeter for Observing Global Ocean Surface Topography
    American Meteorological Society ; 2014
    In:  Journal of Atmospheric and Oceanic Technology Vol. 31, No. 2 ( 2014-02-01), p. 560-568
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 31, No. 2 ( 2014-02-01), p. 560-568
    Abstract: Conventional radar altimeter makes measurement of sea surface height (SSH) in one-dimensional profiles along the ground tracks of a satellite. Such profiles are combined via various mapping techniques to construct two-dimensional SSH maps, providing a valuable data record over the past two decades for studying the global ocean circulation and sea level change. However, the spatial resolution of the SSH is limited by both coarse sampling across the satellite tracks and the instrument error in the profile measurements. A new satellite mission based on radar interferometry offers the capability of making high-resolution wide-swath measurement of SSH. This mission is called Surface Water and Ocean Topography (SWOT), which will demonstrate the application of swath altimeter to both oceanography and land hydrology. This paper presents a brief introduction to the design of SWOT, its performance specification for SSH, and the anticipated spatial resolution and coverage, demonstrating the promise of SWOT for fundamental advancement in observing SSH. A main objective of the paper is to address issues in the anticipated transition of conventional profile altimetry to swath altimetry in the future—in particular, the need for consistency of the new observing system with the old for extending the existing data record into the future. A viable approach is to carry a profile altimeter in the SWOT payload to provide calibration and validation of the new measurement against the old at large scales. This is the baseline design of SWOT. The unique advantages of the approach are discussed in the context of a new standard for observing the global SSH in the future.
    Type of Medium: Online Resource
    ISSN: 0739-0572 , 1520-0426
    URL: Article
    DOI: 10.1175/JTECH-D-13-00109.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2014
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    detail.hit.zdb_id: 48441-6
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  • 5
    Online Resource
    Online Resource
    The challenges in long-term altimetry calibration for addressing the problem of global sea level change
    Elsevier BV ; 2013
    In:  Advances in Space Research Vol. 51, No. 8 ( 2013-4), p. 1284-1300
    Details
    In: Advances in Space Research, Elsevier BV, Vol. 51, No. 8 ( 2013-4), p. 1284-1300
    Type of Medium: Online Resource
    ISSN: 0273-1177
    URL: Article
    DOI: 10.1016/j.asr.2012.06.005
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2013
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    SSG: 16,12
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  • 6
    Online Resource
    Online Resource
    The Effect of Atmospheric Water Vapor Content on the Performance of Future Wide-Swath Ocean Altimetry Measurement
    American Meteorological Society ; 2014
    In:  Journal of Atmospheric and Oceanic Technology Vol. 31, No. 6 ( 2014-06-01), p. 1446-1454
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 31, No. 6 ( 2014-06-01), p. 1446-1454
    Abstract: Measurement of sea surface height (SSH) over a finite swath along satellite tracks has been planned for future space missions. The effect of water vapor in the troposphere on the delay of radar signal must be corrected for in the SSH measurement. The efficacy of a nadir-looking radiometer that has been the approach for conventional altimetry is examined in the study. The focus is placed on the cross-track variability of water vapor that is not measured by the nadir-looking radiometer. Simulations of the 2D field of water vapor were performed by spectral analysis of existing radiometer data. The residual error from the application of the correction made by a nadir-looking radiometer was computed over the global ocean and compared to the SSH signal estimated from satellite altimeter data. Global maps of the signal-to-error ratio (the square root of spectral variance at wavelengths shorter than 500 km) were created, showing values of 20–50 in the regions of high SSH variability of the boundary currents and the Antarctic Circumpolar Current, and 3–5 in the regions of low SSH variability in the tropics. Improvement in the correction by using a two-beam radiometer looking off nadir for measuring the slope of the cross-track variability was also explored, leading to a reduction of the error to below 1 cm at wavelengths of 10–500 km.
    Type of Medium: Online Resource
    ISSN: 0739-0572 , 1520-0426
    URL: Article
    DOI: 10.1175/JTECH-D-13-00179.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2014
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    detail.hit.zdb_id: 48441-6
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  • 7
    Online Resource
    Online Resource
    Vorticity Structures in the Tropical Pacific from a Numerical Simulation
    American Meteorological Society ; 2011
    In:  Journal of Physical Oceanography Vol. 41, No. 8 ( 2011-08-01), p. 1455-1464
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 41, No. 8 ( 2011-08-01), p. 1455-1464
    Abstract: The small-scale variability of the tropical Pacific is studied with the simulations from a numerical model in terms of vorticity structures. A Lagrangian method based on the Okubo–Weiss parameter is used to identify the structures and track their main characteristics. Between 8°S and 8°N, the structure characteristics are spatially inhomogeneous compared to higher latitudes. They can be grouped into three categories: anticyclonic and cyclonic structures off the equator and the equatorial structures between 2°S and 2°N. They all have a strong annual cycle with maximum presence from September to March, except during strong El Niño years, when the number of structures becomes very low. Off the equator from 2° to 8°, the anticyclonic structures dominate, but with drastically different characteristics north and south of the equator. In the north, large nonlinear vortices develop (known as the tropical instability vortices) in phase with the 30–35-day oscillation related to an unstable first-meridional-mode Rossby waves. In the south, mostly fragmentary linear structures are present, with lower propagation speeds. The equatorial structures are mostly counterclockwise. The larger ones tend to be linear and are clearly associated with Yanai waves. The large majority of the cyclonic structures off the equator are also quite linear and smaller and less numerous than the anticyclonic structures. However, some of them are nonlinear with vorticity values higher than 2 times the Coriolis parameter.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/2011JPO4507.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2011
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  • 8
    Online Resource
    Online Resource
    Eddy Dynamics From Satellite Altimetry
    The Oceanography Society ; 2010
    In:  Oceanography Vol. 23, No. 4 ( 2010-12-01), p. 14-25
    Details
    In: Oceanography, The Oceanography Society, Vol. 23, No. 4 ( 2010-12-01), p. 14-25
    Type of Medium: Online Resource
    ISSN: 1042-8275
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.5670/oceanog.2010
    DOI: 10.5670/oceanog
    DOI: 10.5670/oceanog.2010.02
    Language: Unknown
    Publisher: The Oceanography Society
    Publication Date: 2010
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    detail.hit.zdb_id: 2268693-9
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  • 9
    Online Resource
    Online Resource
    Cyclonic eddies formed at the Pacific tropical instability wave fronts
    American Geophysical Union (AGU) ; 2011
    In:  Journal of Geophysical Research Vol. 116, No. C12 ( 2011-12-16)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 116, No. C12 ( 2011-12-16)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2011JC007204
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2011
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    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    The OSTM/Jason-2 Mission
    Informa UK Limited ; 2010
    In:  Marine Geodesy Vol. 33, No. sup1 ( 2010-08-16), p. 4-25
    Details
    In: Marine Geodesy, Informa UK Limited, Vol. 33, No. sup1 ( 2010-08-16), p. 4-25
    Type of Medium: Online Resource
    ISSN: 0149-0419 , 1521-060X
    URL: Article
    DOI: 10.1080/01490419.2010.491030
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2010
    detail.hit.zdb_id: 2021731-6
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