Ocean Surface Geostrophic Circulation Climatology and Annual Variations Inferred from Satellite Altimetry and GOCE Gravity Data

Sanchez-Reales, J. M.; Vigo, M. I.; Trottini, Mario

doi:10.1007/s00024-014-0981-x

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…where W β = 1 and W s = 0 at the equator, while W β → 1 and W s → 0 as the latitude increases (at 5 • N and 5 • S). This formula has been described in more detail in previous studies [18,19]. Suzuki et al [20] compared several sources of wind speed datasets and found that the Cross-Calibrated Multi-Platforms (CCMP) dataset was the most accurate.…”

Section: Methodsmentioning

confidence: 99%

Differences in the Reaction of North Equatorial Countercurrent to the Developing and Mature Phase of ENSO Events in the Western Pacific Ocean

Wijaya

Hisaki

2021

Climate

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The North Equatorial Countercurrent (NECC) is an eastward zonal current closely related to an El Niño Southern Oscillation (ENSO) event. This paper investigated the variations of NECC in the Western Pacific Ocean over 25 years (1993–2017) using satellite data provided by the Copernicus Marine Environment Monitoring Service (CMEMS) and the Remote Sensing System (RSS). The first mode of empirical orthogonal function (EOF) analysis showed that the NECC strengthened or weakened in each El Niño (La Niña) event during the developing or mature phase, respectively. We also found that the NECC shifting was strongly coincidental with an ENSO event. During the developing phase of an El Niño (La Niña) event, the NECC shifted southward (northward), and afterward, when it entered the mature phase, the NECC tended to shift slightly northward (southward). Moreover, the NECC strength was found to have undergone a weakening during the 2008–2017 period.

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Section: Methodsmentioning

confidence: 99%

Differences in the Reaction of North Equatorial Countercurrent to the Developing and Mature Phase of ENSO Events in the Western Pacific Ocean

Wijaya

Hisaki

2021

Climate

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“…For example, Tenze et al (2014) calculated the thickness of the Earth's crust in North-Eastern Pakistan, while Braintenberg (2015) identified tectonic structures with GOCE data in Africa and across-continents. Furthermore, the gradients from the gravimetric satellite mission can be combined with other data, e.g., altimetric to study the changes occurring not only in the solid Earth structures, but also in glaciers (Rummel et al 2011a), atmosphere (Garcia et al 2016;Liu et al 2016) and ocean circulations (Sanchez-Reales et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Studying the sensitivity of GOCE gravity gradients to the crustal structure: case study of Central Europe

et al. 2019

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We discuss the determination of gravity gradients from the orbital ceiling to the depth of the Mohorovičić discontinuity (Moho) for Central Europe. Components of the Eötvös tensor were derived from "Heterogeneous gravity data combination for Earth interior and geophysical exploration research" project ("GOCE+") by using the gridded data with a resolution of 0.2° per 0.2°. Gravity gradients to Moho boundary depth were modelled forward to the 255 km orbital height. We calculated gradient sensitivity using a 3D model divided into: sediments and consolidated crust including the precise location of the Moho boundary. To define tesseroids as mathematical model we need to set two parameters of the crust: density and thickness for each spherical layer separately. Altitudes for topography/bathymetry were derived from ETOPO1 model, sediments thickness from EuCRUST-07 model,

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Mediterranean Surface Geostrophic Circulation from Satellite Gravity and Altimetry Observations

Vigo¹,

Sempere²,

Chao³

et al. 2019

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We present a data-based approach to study the mean and the climatology of the Surface Geostrophic Currents (SGC) for the Mediterranean Sea, using satellite ocean surface altimetry observations for 22 years (1993-2014) in conjunction with the geoid solution derived from the space mission of GOCE (Gravity field and steady-state Ocean Circulation Explorer; Release 4). The resultant product is the Mediterranean SGC velocity field, that we denote by SGC GOCE−Alt , given in spatial resolution of 1/4 • and monthly time resolution. It exhibits smaller scales and lower dynamic intensities in comparison with open oceans, making the Mediterranean Sea a challenging test case for our satellite-based analysis. The mean SGC GOCE−Alt is largely consistent with previous findings but with additional circulation features in time and space. We also compare our results with the SGC output from the regional hydrodynamic model of Mercator that assimilates satellite altimetry, satellite sea surface temperature, and in-situ observations. The prominent SGC features agree well not only on the large and subbasin scales but also in the widespread mesoscale dynamics. We find however comparatively lower intensities than the Mercator model in general, with differences that are on average around 7 cm/s, but might reach 13 cm/s in some coastal areas.

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Ocean Surface Geostrophic Circulation Climatology and Annual Variations Inferred from Satellite Altimetry and GOCE Gravity Data

Cited by 4 publications

References 20 publications

Differences in the Reaction of North Equatorial Countercurrent to the Developing and Mature Phase of ENSO Events in the Western Pacific Ocean

Differences in the Reaction of North Equatorial Countercurrent to the Developing and Mature Phase of ENSO Events in the Western Pacific Ocean

Studying the sensitivity of GOCE gravity gradients to the crustal structure: case study of Central Europe

Mediterranean Surface Geostrophic Circulation from Satellite Gravity and Altimetry Observations

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