The estimation of geoid profiles in the northwest Atlantic from simultaneous satellite altimetry and airborne expendable bathythermograph sections

Mitchell, J. L.; Dastugue, J. M.; Teague, William J.; Hallock, Zachariah R.

doi:10.1029/jc095ic10p17965

Cited by 31 publications

(16 citation statements)

References 12 publications

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“…The XBT observations were taken prior to mooring deployment and recovery operations along ?0øW from-39øN to-33øN. Regional AXBT surveys were conducted in the general region as part of the Northwest Atlantic Regional Energetics Experiment (REX) [Mitchell et al, 1985[Mitchell et al, , 1990 Vazquez et al, 1990;Vazquez, 1991] and information concerning the present utilization of Geosat data are given in Chaiet al [1991]. Because of a lack of a geoid model, the mean sea level, computed as the 2-year average SSH (and thus the signature of the Gulf Stream), is removed [Vazquez et al, 1990].…”

mentioning

confidence: 99%

Seasonal variability of bio‐optical and physical properties in the Sargasso Sea

Dickey¹,

Granata²,

Marra³

et al. 1993

J. Geophys. Res.

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The seasonal variability of bio‐optical and physical properties within the upper ocean at a site in the Sargasso Sea (34°N, 70°W) has been observed using multivariable moored systems (MVMS) during a 9‐month period (March through November 1987). In addition, complementary meteorological data, sea surface height (Geosat) and sea surface temperature maps, and expendable bathythermograph (XBT) and shipboard profile data (physical and bio‐optical) have been utilized for interpretation. The observations during March are characteristic of late wintertime conditions of a deep isothermal layer (∼18–19°C), but with intervening periods of warming due to the advection of warm outbreak waters associated with Gulf Stream meanders. The mixed layer depth shoals from greater than 160 m to about 25 m in late March (spring transition). Phytoplankton blooms follow the mixed layer shoaling. A succession of phytoplankton populations occurs during this transitional interval. Mesoscale variability associated with cold core rings and warm outbreak waters associated with the Gulf Stream are evident at various times. The mixed layer remains near 25 m for the summer and deepens in mid‐September. A relatively intense subsurface maximum in chlorophyll develops at ∼75 m following the spring transition. The maximum persists, but weakens in mid‐summer. The present study clearly indicates that important processes associated with and contributing to the seasonal cycle occur on short time and space scales and that integrated data sets obtained from moorings, ships, and satellites can be used to effectively study bio‐optical and physical phenomena on time scales from minutes to seasons.

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confidence: 99%

Seasonal variability of bio‐optical and physical properties in the Sargasso Sea

Dickey¹,

Granata²,

Marra³

et al. 1993

J. Geophys. Res.

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“…3. Synthetic climatology methods (Mitchell et al 1990;Glenn et al 1991;Qiu et al 1991;Ichikawa et al 1995;Uchida et al 1998;Rio and Hernandez 2004;Rio et al 2005). 4.…”

Section: Introductionmentioning

confidence: 99%

An alternative direct method towards mean dynamic topography computations

Karimi

Ardalan

2010

Ocean Dynamics

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An alternative "direct method" to "mean dynamic topography" (MDT) computations using satellite altimetry-derived "mean sea surface" (MSS) and "global geopotential model" (GGM), without direct application of the geoid, is devised. The developed approach, which is based on derivation of an equipotential surface of the gravity field of the Earth that fits to global MSS in least squares sense, is formulated via a constrained optimization problem. The validity of our method is numerically tested by computing a global MDT model based on DNSC08 MSS model and EGM2008 GGM as input data.

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“…Variations of the dynamic ocean-surface topography can then be obtained by differencing the sea-surface heights and the synthetic (averaged) geoid. Numerous scientific results have been obtained using the above techniques(Mitchell et al 1990;Zlotnicki, Fu & Patzert 1989;Cheney, Marsh & Beckley 1983;Sandwell & Zhang 1989;Sandwell & McAdoo 1990).…”

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confidence: 98%

The accuracy and applications of satellite altimetry

Shum

Ries

Tapley

1995

Geophysical Journal International

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S U M M A R YT h e recently launched T O P E X / P O S E I D O N altimeter mission is achieving an unprecedented accuracy in the measurement of the absolute sea-level, demonstrating that satellite radar altimetry has evolved into one of the fundamental instruments for providing synoptic observations of the global oceans with a temporal sampling of a few days t o a month. This paper assesses the current estimated accuracy of measurements using the available satellite radar altimeter systems in observing the absolute sea-level. T h e accuracy of sea-level measurements depends on the ability to compute accurate orbits of the altimetric satellites, t h e fidelity of the terrestrial reference system (TRF), and the knowledge of instrument biases of the altimeter instruments. In this paper, some applications of satellite altimetry t o contemporary problems in marine geodesy, oceanography, an$ global change studies are discussed. Major advances for many of these problems are feasible with the abundance of satellite altimetry missions within this decade. T h e launch of ERS-1 and T O P E X / P O S E I D O N has initiated a decade of high-accuracy measurements of the absolute sea-level from satellite altimetry which holds potential for enhancing o u r knowledge of dynamics of the global ocean, and its influence on global climate changes.

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The estimation of geoid profiles in the northwest Atlantic from simultaneous satellite altimetry and airborne expendable bathythermograph sections

Cited by 31 publications

References 12 publications

Seasonal variability of bio‐optical and physical properties in the Sargasso Sea

Seasonal variability of bio‐optical and physical properties in the Sargasso Sea

An alternative direct method towards mean dynamic topography computations

The accuracy and applications of satellite altimetry

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