Comparison and evaluation of high-resolution marine gravity recovery via sea surface heights or sea surface slopes

2021 ◽  
Vol 95 (6) ◽  
Author(s):  
Shengjun Zhang ◽  
Adili Abulaitijiang ◽  
Ole Baltazar Andersen ◽  
David T. Sandwell ◽  
James R. Beale
Keyword(s):  
High Resolution ◽  
Sea Surface ◽  
Surface Slopes ◽  
Marine Gravity ◽  
Sea Surface Slopes ◽  
Sea Surface Heights ◽  
Gravity Recovery

Sea Surface Heights and Marine Gravity Determined from SARAL/AltiKa Ka-band Altimeter Over South China Sea

2021 ◽  
Author(s):  
Chengcheng Zhu ◽  
Xin Liu ◽  
Jinyun Guo ◽  
Shengwen Yu ◽  
Yupeng Niu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Sea Surface ◽  
Ka Band ◽  
China Sea ◽  
Marine Gravity ◽  
Sea Surface Heights

Measurements of sea surface slopes by laser sensing from a space vehicle

2017 ◽  
Vol 72 (4) ◽  
pp. 410-414 ◽  
Author(s):  
K. V. Pokazeev ◽  
A. S. Zapevalov ◽  
K. E. Lebedev
Keyword(s):  
Space Vehicle ◽  
Sea Surface ◽  
Surface Slopes ◽  
Laser Sensing ◽  
Sea Surface Slopes

scholarly journals Recovering Marine Gravity Over the Gulf of Guinea From Multi-Satellite Sea Surface Heights

2021 ◽  
Vol 9 ◽  
Author(s):  
Richard Fiifi Annan ◽  
Xiaoyun Wan
Keyword(s):  
Gravity Field ◽  
Gravity Anomalies ◽  
Sea Surface ◽  
Shallow Waters ◽  
Gulf Of Guinea ◽  
Gravity Field Model ◽  
The North ◽  
Marine Gravity ◽  
Sea Surface Heights ◽  
East Component

A regional gravity field product, comprising vertical deflections and gravity anomalies, of the Gulf of Guinea (15°W to 5°E, 4°S to 4°N) has been developed from sea surface heights (SSH) of five altimetry missions. Though the remove-restore technique was adopted, the deflections of the vertical were computed directly from the SSH without the influence of a global geopotential model. The north-component of vertical deflections was more accurate than the east-component by almost three times. Analysis of results showed each satellite can contribute almost equally in resolving the north-component. This is attributable to the nearly northern inclinations of the various satellites. However, Cryosat-2, Jason-1/GM, and SARAL/AltiKa contributed the most in resolving the east-component. We attribute this to the superior spatial resolution of Cryosat-2, the lower inclination of Jason-1/GM, and the high range accuracy of the Ka-band of SARAL/AltiKa. Weights of 0.687 and 0.313 were, respectively, assigned to the north and east components in order to minimize their non-uniform accuracy effect on the resultant gravity anomaly model. Histogram of computed gravity anomalies compared well with those from renowned models: DTU13, SIOv28, and EGM2008. It averagely deviates from the reference models by −0.33 mGal. Further assessment was done by comparing it with a quadratically adjusted shipborne free-air gravity anomalies. After some data cleaning, observations in shallow waters, as well as some ship tracks were still unreliable. By excluding the observations in shallow waters, the derived gravity field model compares well in ocean depths deeper than 2,000 m.

Wind-Induced Sea-Surface Slopes on the West Florida Shelf

1983 ◽  
Vol 13 (12) ◽  
pp. 2201-2212 ◽  
Author(s):  
John Cragg ◽  
Gary Mitchum ◽  
W. Sturges
Keyword(s):  
Sea Surface ◽  
West Florida Shelf ◽  
The West ◽  
Florida Shelf ◽  
Surface Slopes ◽  
Sea Surface Slopes

scholarly journals Accurate Sea Surface heights from Sentinel-3A and Jason-3 retrackers by incorporating High-Resolution Marine Geoid and Hydrodynamic Models

2021 ◽  
Vol 11 (1) ◽  
pp. 58-74
Author(s):  
M. Mostafavi ◽  
N. Delpeche-Ellmann ◽  
A. Ellmann
Keyword(s):  
High Resolution ◽  
Baltic Sea ◽  
Hydrodynamic Model ◽  
Average Distance ◽  
Sea Surface ◽  
Hydrodynamic Models ◽  
Geoid Model ◽  
Sea Surface Heights ◽  
Ice Conditions ◽  
The Baltic

Abstract One of the major challenges of satellite altimetry (SA) is to produce accurate sea surface heights data up to the shoreline, especially in geomorphologically complex sea areas. New advanced re-tracking methods are expected to deliver better results. This study examines the achievable accuracy of Sentinel-3A (S3A) and Jason-3 (JA3) standard retrackers (Ocean and MLE4) with that of improved retrackers adapted for coastal and sea ice conditions (ALES+ SAR for S3A and ALES+ for JA3). The validation of SA data was performed by the integration of tide gauges, hydrodynamic model and high-resolution geoid model. The geoid being a key component that links the vertical reference datum of the SA with other utilized sources. The method is tested in the eastern section of Baltic Sea. The results indicate that on average reliable sea surface height (SSH) data can be obtained 2–3 km from the coastline for S3A (for both Ocean and ALES+SAR) whilst an average distance of 7–10 km for JA3 (MLE4 and ALES+) with a minimum distance of 3–4 km. In terms of accuracy, the RMSE (with respect to a corrected hydrodynamic model) of S3A ALES+ SAR and Ocean retrackers based SSH were 4–5 cm respectively, whereas with the JA3 ALES+ and MLE4 associated SSH RMSE of 6–7 cm can be achieved. The ALES+ and ALES+ SAR retrackers show SSH improvement within a range of 0.5–1 cm compared to the standard retrackers. This assessment showed that the adaptation of localized retrackers for the Baltic Sea (ALES+ and ALES+SAR) produced more valid observation closer to the coast than the standard retrackers and also improved the accuracy of SSH data.

Comparative analysis between two different glitter functions for deducing statistical properties of sea surface slopes

2013 ◽  
Author(s):  
JL Poom ◽  
Josué Álvarez-Borrego ◽  
Ángel Coronel-Beltrán ◽  
Beatriz Martín-Atienza
Keyword(s):  
Comparative Analysis ◽  
Statistical Properties ◽  
Sea Surface ◽  
Surface Slopes ◽  
Sea Surface Slopes

scholarly journals Dependences of the characteristics of sea surface slopes on the spatial ranges of the waves creating them

2020 ◽  
Vol 2020 (5) ◽  
Author(s):  
A.S. Zapevalov ◽  
◽  
I.P. Shumeyko ◽  
A.Yu. Abramovich ◽  
◽  
...  
Keyword(s):  
Sea Surface ◽  
Surface Slopes ◽  
Sea Surface Slopes ◽  
The Waves
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