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  • 1
    Online Resource
    Online Resource
    Improving ocean angular momentum estimates using a model constrained by data
    American Geophysical Union (AGU) ; 2001
    In:  Geophysical Research Letters Vol. 28, No. 9 ( 2001-05-01), p. 1775-1778
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 28, No. 9 ( 2001-05-01), p. 1775-1778
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2000GL011671
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    Rapid ocean signals in polar motion and length of day : RAPID OCEAN SIGNALS AND EARTH ROTATION
    American Geophysical Union (AGU) ; 2002
    In:  Geophysical Research Letters Vol. 29, No. 15 ( 2002-08), p. 6-1-6-4
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 29, No. 15 ( 2002-08), p. 6-1-6-4
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2002GL015312
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Nonlinear Effects of Variable Winds on Ocean Stress Climatologies
    American Meteorological Society ; 2004
    In:  Journal of Climate Vol. 17, No. 6 ( 2004-03), p. 1283-1293
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 17, No. 6 ( 2004-03), p. 1283-1293
    Type of Medium: Online Resource
    ISSN: 0894-8755 , 1520-0442
    URL: Article
    DOI: 10.1175/1520-0442(2004)017〈1283:NEOVWO〉2.0.CO;2
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2004
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  • 4
    Online Resource
    Online Resource
    Regional Signals in Atmospheric and Oceanic Excitation of Polar Motion
    Cambridge University Press (CUP) ; 2000
    In:  International Astronomical Union Colloquium Vol. 178 ( 2000), p. 463-472
    Details
    In: International Astronomical Union Colloquium, Cambridge University Press (CUP), Vol. 178 ( 2000), p. 463-472
    Abstract: Atmospheric and oceanic variability have been shown to play a role in the excitation of polar motion. Regional patterns of atmospheric and oceanic excitation are analysed and compared. The equatorial excitation functions, χ 1 an χ 2 , for the ocean are computed using velocity and mass fields from a near-global ocean model, driven by observed surface winds stresses, surface heat and freshwater fluxes, for the period from January 1985 to June 1997. To understand the relative role of the ocean versus the atmosphere, we used atmospheric excitation functions computed from the National Centers for Environmental Prediction/National Center for Atmospheric Research reanalyses. We consider regional mass terms [bottom pressure and atmospheric surface pressure with the inverted barometer (IB) correction] and regional motion terms as well (currents and winds). Results here confirm recent findings that oceans supplement the atmosphere as an important source for polar motion excitation. Regional signals in the oceanic bottom pressure terms have comparable amplitudes to those in the atmospheric pressure-IB terms. The regional wind term amplitudes, however, are several times larger than the values for both regional oceanic currents term and atmospheric pressure-IB term. Power in regional oceanic excitation is distributed between seasonal and subseasonal timescales while in the case of atmospheric excitation it is concentrated rather at seasonal timescales.
    Type of Medium: Online Resource
    ISSN: 0252-9211
    URL: Article
    DOI: 10.1017/S0252921100061613
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2000
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  • 5
    Online Resource
    Online Resource
    Uncertainties in ECMWF Surface Pressure Fields over the Ocean in Relation to Sea Level Analysis and Modeling
    American Meteorological Society ; 2003
    In:  Journal of Atmospheric and Oceanic Technology Vol. 20, No. 2 ( 2003-02), p. 301-307
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 20, No. 2 ( 2003-02), p. 301-307
    Type of Medium: Online Resource
    ISSN: 0739-0572 , 1520-0426
    URL: Article
    DOI: 10.1175/1520-0426(2003)020〈0301:UIESPF〉2.0.CO;2
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2003
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  • 6
    Online Resource
    Online Resource
    Nontidal oceanic excitation of nutation and diurnal/semidiurnal polar motion revisited : NONTIDAL OCEANIC EXCITATION OF NUTATION
    American Geophysical Union (AGU) ; 2004
    In:  Journal of Geophysical Research: Solid Earth Vol. 109, No. B11 ( 2004-11)
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 109, No. B11 ( 2004-11)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2004JB003054
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2004
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    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    Atmospheric torques on land and ocean and implications for Earth's angular momentum budget
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Atmospheres Vol. 106, No. D11 ( 2001-06-16), p. 11793-11799
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 106, No. D11 ( 2001-06-16), p. 11793-11799
    Abstract: The exchange of angular momentum between the atmosphere and the oceans and solid Earth is examined using 40 years of atmospheric angular momentum (AAM) and ocean and land torque data from the National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis. Land torques are the dominant driving mechanism for AAM at submonthly periods. Ocean torques are as important as land torques at periods of 3 months and longer, however. With the exception of the annual and semiannual bands the ocean torque seems to mainly damp the AAM signals. The importance of the ocean torque implies a three‐way interaction among atmosphere, oceans, and solid Earth. For an ocean that simply transmits to the solid Earth the angular momentum exchanged with the atmosphere, with a delay of a few days at most, the analyzed torques imply that AAM should lead the length of day (LOD), which is contrary to the observations at monthly and longer periods. Sources of missing angular momentum variability, either from atmospheric or other origins, that can potentially explain the observed AAM and LOD phase relationship are discussed.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2001JD900028
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
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    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    Atmospheric pressure corrections in geodesy and oceanography: A strategy for handling air tides : AIR TIDES FOR USE IN GEODESY AND OCEANOGRAPHY
    American Geophysical Union (AGU) ; 2002
    In:  Geophysical Research Letters Vol. 29, No. 24 ( 2002-12), p. 6-1-6-4
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 29, No. 24 ( 2002-12), p. 6-1-6-4
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2002GL016340
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
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    SSG: 16,13
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  • 9
    Online Resource
    Online Resource
    Indirect effect of the atmosphere through the oceans on the Earth nutation using the torque approach
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Solid Earth Vol. 106, No. B5 ( 2001-05-10), p. 8841-8851
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 106, No. B5 ( 2001-05-10), p. 8841-8851
    Abstract: The atmosphere exerts a direct torque on the Earth, perturbing its rotation. Additionally, the atmosphere exerts pressure, gravitational, and friction forces on the ocean, which induce an indirect effect of the atmosphere on the Earth. The oceanic response consists of variable currents and mass fluxes. These effects change the oceanic torque on the Earth. As the atmosphere has a large diurnal cycle, the indirect torque also presents a large diurnal component. This indirect diurnal torque is investigated using a numerical barotropic ocean model. In particular, we show that a dynamic ocean model is essential to compute the indirect effect of the atmosphere on nutation, as the oceanic response is far from that predicted by a static model. We also point out that the response of the ocean is nevertheless highly correlated with the atmospheric signal for the diurnal timescale but with a large amplification. The amount of ocean bottom friction is found to have a substantial influence on the indirect diurnal torque acting on the Earth. The effect of this indirect torque on the Earth nutation is computed and found to be much larger than the precision of current nutation observations, but results are uncertain in light of discrepancies in the angular momentum and torque balance.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JB900387
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    detail.hit.zdb_id: 2016804-4
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    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Global and regional axial ocean angular momentum signals and length‐of‐day variations (1985–1996)
    American Geophysical Union (AGU) ; 2000
    In:  Journal of Geophysical Research: Oceans Vol. 105, No. C7 ( 2000-07-15), p. 17161-17171
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 105, No. C7 ( 2000-07-15), p. 17161-17171
    Abstract: Changes in ocean angular momentum M about the polar axis are related to fluctuations in zonal currents (relative component M r ) and latitudinal shifts in mass (planetary component M Ω ). Output from a 1° ocean model is used to calculate global M r , M Ω , and M time series at 5 day intervals for the period January 1985 to April 1996. The annual cycle in M r , M Ω , and M is larger than the semiannual cycle, and M Ω amplitudes are nearly twice those of M r . Year‐to‐year modulation of the seasonal cycle is present, but interannual variability is weak. The spectrum of M is red (background slope between ω −1 and ω −2 ) at subseasonal periods, implying a white or blue spectrum for the external torque on the ocean. Comparisons with previous studies indicate the importance of direct atmospheric forcing in inducing subseasonal M signals, relative to instabilities and other internal sources of rapid oceanic signals. Regional angular momentum estimates show that seasonal variability tends to be larger at low latitudes, but many local maxima exist because of the spatial structure of zonal current and mass variability. At seasonal timescales, latitudes ∼20°S–10°N contribute substantial variability to M Ω , while signals in M r can be traced to Antarctic Circumpolar Current transports and associated circulation. Variability in M is found to be small when compared with similar time series for the atmosphere and the solid Earth, but ocean signals are significantly coherent with atmosphere‐solid Earth residuals, implying a measurable oceanic impact on length‐of‐day variations.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/1999JC000157
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2000
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    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
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    SSG: 16,13
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