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  • Busalacchi, Antonio J.  (3)
  • 1990-1994  (3)
Material
Publisher
Person/Organisation
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  • 1990-1994  (3)
Year
  • 1
    Online Resource
    Online Resource
    Oceanic heat content variability in the tropical Pacific during the 1982–1983 El Niño
    American Geophysical Union (AGU) ; 1990
    In:  Journal of Geophysical Research: Oceans Vol. 95, No. C12 ( 1990-12-15), p. 22089-22101
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 95, No. C12 ( 1990-12-15), p. 22089-22101
    Abstract: Anomalous heat transport and storage during the 1982–1983 El Niño are investigated using a linear, multimode model forced by observed winds. Heat transport is decomposed into symmetric (about the equator) and antisymmetric components. The former was dominated by anomalous northward Ekman transport which represented an enhancement of the usual seasonal cycle. The latter involved both Ekman and geostrophic transports. Near‐equatorial wind anomalies forced Kelvin and Rossby waves usually associated with El Niño; together these waves set up antisymmetric, geostrophic transport which tended to oppose direct Ekman transport. Because the opposition was imperfect, there was net heat convergence which caused variations in heat content in bands of latitude centered on the equator. Within a fairly narrow band (±5°) heat content was anomalously high preceding El Niño and was depleted following the event. Equatorial heat content anomalies were largely compensated by opposing anomalies in low latitudes of the extraequatorial ocean so that variability over broader bands of latitude about the equator was relatively small. A sampling study employing the model suggests that observational evidence for a heat content variations over the region ±15° is an artifact arising from inadequate spatial resolution offered by the sea level measurement network.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JC095iC12p22089
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1990
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Validation of the geostrophic method for estimating zonal currents at the equator from Geosat altimeter data
    American Geophysical Union (AGU) ; 1990
    In:  Journal of Geophysical Research: Oceans Vol. 95, No. C3 ( 1990-03-15), p. 3015-3024
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 95, No. C3 ( 1990-03-15), p. 3015-3024
    Abstract: The applicability of satellite altimeter data for estimating zonal current variability at the equator is assessed using the meridionally differenced form of the geostrophic balance. Estimates of geostrophic zonal flow anomalies in the equatorial Pacific have been deduced from 17‐day collinear altimeter data during the first year of the Geosat Exact Repeat Mission, November 1986 to November 1987. Altimeter‐derived geostrophic estimates agree well with in situ zonal current variability. Comparison of low‐frequency, near‐surface zonal current observed from equatorial moorings at 165°E;, 140°W, and 110°W yield correlations of 0.83, 0.85, and 0.51, respectively, with a mean rms difference of 23 cm s −1 . The geostrophic currents were calculated from all available ascending and descending Geosat tracks within ±4.5° of longitude from each mooring site. The inclusion of up to 11 ascending and descending Geosat tracks within the 9° band for every 17‐day repeat effectively reduced the temporal sampling interval to 1.5 days at 165°E and 140°W. However, only ascending tracks were available at 110°W. Alongtrack sea surface heights were first smoothed using a combination of linear and nonlinear filters. The 6.8 km alongtrack spacing of the altimeter measurements provides sufficient resolution for the effective filtering of small‐scale meridional noise, both instrumental and oceanic. High‐frequency temporal variability, such as noise and ageostrophic motions, was suppressed with a 31‐day Hanning filter. Sea level and zonal velocity solutions from a tropical Pacific numerical model were used as proxy data sets in order to estimate errors induced into the geostrophic calculation by the Geosat space‐time sampling.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JC095iC03p03015
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1990
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Variability in equatorial Pacific sea surface topography during the verification phase of the TOPEX/POSEIDON mission
    American Geophysical Union (AGU) ; 1994
    In:  Journal of Geophysical Research: Oceans Vol. 99, No. C12 ( 1994-12-15), p. 24725-24738
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 99, No. C12 ( 1994-12-15), p. 24725-24738
    Abstract: As part of the verification phase of the TOPEX/POSEIDON mission, 10‐day gridded fields of altimeter data derived from TOPEX geophysical data records are compared with 10‐day gridded fields of dynamic height derived from more than 60 moorings of the Tropical Ocean and Global Atmosphere‐Tropical Atmosphere Ocean (TOGA‐TAO) array in the equatorial Pacific Ocean. Access to TAO data in real time permits the first 500 days of the TOPEX/POSEIDON mission to be placed in the context of complementary, in situ measurements of surface winds, sea surface temperatures, and upper ocean thermal structure, as well as the time history of these variables prior to launch. Analysis of the space‐time structure in the TOPEX and TAO surface topography data indicates sea level variability primarily due to equatorial Kelvin wave activity generated by intense wind bursts west of the date line in association with the 1991–1993 El Niño. Cross correlations between the two data sets are generally 〉 0.7, with RMS differences 〈 4 cm. However, for reasons not fully understood, correlations drop to 〈 0.5 in certain regions off the equator in the eastern Pacific, and RMS differences can be 〉 5 cm north of the equator in the central and eastern Pacific.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JC01638
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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    SSG: 16,13
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    BibTip Others were also interested in ...
    Online Resource
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