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A New Method of De-Aliasing Large-Scale High-Frequency Barotropic Signals in the Mediterranean Sea ArchiMer
Hu, Denghui; Xu, Yongsheng.
With the development of satellite observation technology, higher resolution and shorter return cycle have also placed higher demands on satellite data processing. The non-tide high-frequency barotropic oscillation in the marginal sea produces large aliasing errors in satellite altimeter observations. In previous studies, the satellite altimeter aliasing correction generally relied on a few bottom pressure data or the model data. Here, we employed the high-frequency tide gauge data to extract the altimeter non-tide aliasing correction in the west Mediterranean Sea. The spatial average method and EOF analysis method were adopted to track the high-frequency oscillation signals from 15 tide gauge records (TGs), and then were used to correct the aliasing errors...
Tipo: Text Palavras-chave: Tide gauge; EOF analysis; De-aliasing; Altimeter.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00641/75262/75467.pdf
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Evidence for a differential sea level rise between hemispheres over the twentieth century ArchiMer
Woeppelmann, Guy; Marcos, Marta; Santamaria-gomez, Alvaro; Martin-miguez, Belen; Bouin, Marie-noelle; Gravelle, Mederic.
Tide gauge records are the primary source of sea level information over multidecadal to century timescales. A critical issue in using this type of data to determine global climate-related contributions to sea level change concerns the vertical motion of the land upon which the gauges are grounded. Here we use observations from the Global Positioning System for the correction of this vertical land motion. As a result, the spatial coherence in the rates of sea level change during the twentieth century is highlighted at the local and the regional scales, ultimately revealing a clearly distinct behavior between the Northern and the Southern Hemispheres with values of 2.0mm/yr and 1.1mm/yr, respectively. Our findings challenge the widely accepted value of...
Tipo: Text Palavras-chave: Sea level; Climate change; Land motion; Geodesy; Tide gauge; GPS.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00489/60025/63282.pdf
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