A non-isostatic global sea level response to barometric pressure near 5 days

Naoki Hirose, Ichiro Fukumori, Rui M. Ponte

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    Changes in surface atmospheric pressure usually induce an isostatic response in the ocean characterized by an adjustment in sea level at the rate of approximately -1cm/hPa. Nonisostatic signals are, however, observed at many tropical tide gauges at periods near 5 days. Our analysis of satellite observations reveals the global nature of these signals, involving nonisostatic sea level fluctuations with nearly uniform phase within separate basins and an out-of-phase oscillation between the Atlantic and Pacific Oceans. Comparisons with a barotropic model further link the observed signals to forcing by a large scale pressure wave in the atmosphere and show that constrictions between basins prevent an isostatic response from being established. The apparent forced, nonresonant nature of the nonisostatic response contrasts with the predominantly resonant ocean dynamics at higher frequencies and may be relevant to explain the behavior of the long period tides.

    Original languageEnglish
    Pages (from-to)2441-2444
    Number of pages4
    JournalGeophysical Research Letters
    Volume28
    Issue number12
    DOIs
    Publication statusPublished - Jun 15 2001

    Fingerprint

    sea level
    atmospheric pressure
    tides
    ocean
    ocean dynamics
    Atlantic Ocean
    Pacific Ocean
    satellite observation
    tide gauge
    surface pressure
    basin
    elastic waves
    constrictions
    oceans
    tide
    adjusting
    oscillation
    atmospheres
    oscillations
    atmosphere

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Earth and Planetary Sciences(all)

    Cite this

    A non-isostatic global sea level response to barometric pressure near 5 days. / Hirose, Naoki; Fukumori, Ichiro; Ponte, Rui M.

    In: Geophysical Research Letters, Vol. 28, No. 12, 15.06.2001, p. 2441-2444.

    Research output: Contribution to journalArticle

    Hirose, Naoki ; Fukumori, Ichiro ; Ponte, Rui M. / A non-isostatic global sea level response to barometric pressure near 5 days. In: Geophysical Research Letters. 2001 ; Vol. 28, No. 12. pp. 2441-2444.
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