Satellite altimetry, ocean dynamics and the marine geoid

Self- and Inter-Crossover Points of Jasons’ Missions as New Essential Add-on of Satellite Altimetry in the Sub-Arctic Seas and the Southern Ocean

10.20944/preprints202101.0137.v1 ◽

2021 ◽

Author(s):

Sergei Badulin ◽

Andrey Kostianoy ◽

Pavel Shabanov ◽

Vitali Sharmar ◽

Vika Grigorieva ◽

...

Keyword(s):

Sea Level ◽

Satellite Altimetry ◽

Water Exchange ◽

Wind Wave ◽

World Ocean ◽

Ocean Dynamics ◽

Time Lags ◽

Arctic Seas ◽

Scientific Publications ◽

Additional Information

Satellite altimetry is successfully developing during the past three decades for the sea level, ocean dynamics, coastal oceanography, planetary waves, ocean tides, wind and wave, ice cover, Earth’s gravity field, and climatology research. We propose a new essential add-on of satellite altimetry related to the peculiarities of the orbits of the Topex/Poseidon and Jasons’ satellite missions which were not mentioned before in the scientific publications. Derived subsets of “self-crossover” and “inter-crossover” points in sub-polar latitudes are discussed in detail in the context of water exchange, and wind-wave dynamics, and potential challenges to be solved. The relatively short time lags between measurements at these crossovers provide additional information on anomalies of magnitudes and directions of ocean currents, and characteristics of wind-driven waves. Resulting data snapshots with constant space and time intervals can be regarded as time series of virtual buoys, an analog of continuous buoy measurements of the sea level, wind speed, and wave height. Areas of the World Ocean where these specific crossovers occur are described in the context of water exchange, wind wave studies, and potential challenges to be solved. The value of these special crossovers for studies and monitoring of the sub-polar seas is illustrated by a case study.

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Improved satellite altimetry for the observation of coastal ocean dynamics: a case study for the northern Indian Ocean

10.1117/12.695203 ◽

2006 ◽

Author(s):

F. Durand ◽

D. Shankar ◽

F. Birol ◽

S. S. C. Shenoi ◽

L. Roblou ◽

...

Keyword(s):

Indian Ocean ◽

Satellite Altimetry ◽

Coastal Ocean ◽

Ocean Dynamics ◽

Northern Indian Ocean

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Satellite altimetry and ocean dynamics

Comptes Rendus Geoscience ◽

10.1016/j.crte.2006.05.015 ◽

2006 ◽

Vol 338 (14-15) ◽

pp. 1063-1076 ◽

Cited By ~ 11

Author(s):

Lee Lueng Fu ◽

Pierre-Yves Le Traon

Keyword(s):

Satellite Altimetry ◽

Ocean Dynamics

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New insight of the West Tropical Atlantic Circulation based on 25 years of satellite altimetry, PIRATA data and GLORYS ocean reanalysis

10.5194/egusphere-egu21-12222 ◽

2021 ◽

Author(s):

Fabrice Hernandez ◽

Djoirka M. Dimoune ◽

Florence Birol ◽

Fabien Leger ◽

Moacyr Araujo

Keyword(s):

Interannual Variability ◽

Satellite Altimetry ◽

Ocean Dynamics ◽

Physical Parameters ◽

Tropical Atlantic ◽

The West ◽

Ocean Reanalysis ◽

The North ◽

North Brazil ◽

Basin Scale

<div><span>Satellite altimetry offers a mesoscale description of the ocean surface circulation worldwide since 1993. The Mercator Oc&#233;an GLORYS12 reanalysis complement this description with a consistent 3-dimensional estimation of ocean physical parameters over the same period, with a reliability supported by the assimilation of available in-situ and satellite data. This information is used to revisit the ocean circulation description over the West Tropical Atlantic and in particular the seasonal and interannual variability of the western boundary current system from 20&#176;S to 20&#176;N connected to the tropical Atlantic basin scale circulation. PIRATA data since 2000 are used to validate the ocean reanalysis, and complement the description at depth of the main currents. The variability pattern and main characteristics of the North Brazil Undercurrent, the North Brazil Current and its Retroflection (NBCR), and the connections with the Equatorial Undercurrents, the South and North Equatorial Currents (SEC/NEC) and CounterCurrents (NECC) show seasonal changes. Both of their main pattern and the associated mesoscale field are dominated by the seasonal regimes. This circulation is linked to the tropical Atlantic Climate variability and the coupled pattern of wind and ocean dynamics. In particular, we show that the interannual variability of NECC, depending on the NBCR and SEC/NEC water transport exhibits different branches in relation with Tropical Atlantic Zonal and Meridional Mode of variability.</span></div>

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