Abstract This paper reviews the recent progress in our estimation of ocean dynamic topography and derived surface geostrophic currents, mainly based on multiple nadir radar altimeter missions. These altimetric observations provide cornerstone circulation observing system from space. The largest signal sea is mean dominated by marine geoid, we will discuss altimetry, once geoid other corrections...

We compare new marine gravity fields derived from satellite altimetry with shipboard measurements over a region of more than 120,000 square kilometers in the central South Atlantic. Newly declassified satellite data were employed to construct free-air anomaly maps on 0.05 degree grids [Sandwell and Smith, 1992; Marks et al., 1993]. An extensive gravity and bathymetry dataset from four cruises a...

Marine gravimetry provides high-quality gravity measurements, particularly in coastal areas. After the update of new sensors GFZ’s air-marine gravimeter Chekan-AM, measurements showed a significant improvement from first campaign DENEB2017 with an accuracy 0.3/2=0.21 mGal @ 1 km along tracks, which is at highest level marine gravimetry. Then, these were used to assess data derived satellite alt...

The launch of ERS-l provides coverage, by satellite altimetry, of 80% of the Antarctic ice sheet, allowing topographic mapping of areas which previously had a dearth of accurate elevation data. Four 35 d repeat cycles of fastdelivery altimeter data were used in this study, comprising a total of approximately 1000000 height estimates. About 40% of these were rejected during a careful filtering p...

Short-range ocean forecast and reanalysis systems routinely combine observations from satellite altimetry, satellite sea surface temperature (SST), and in situ temperature and salinity, to initialise global and regional ocean models. The most critical observation type for eddy-resolving applications is arguably satellite altimetry. To quantify the impact of satellite altimetry observations on a...

aBstr aCt. Seamounts are active or extinct undersea volcanoes with heights exceeding ~ 100 m. They represent a small but significant fraction of the volcanic extrusive budget for oceanic seafloor and their distribution gives information about spatial and temporal variations in intraplate volcanic activity. In addition, they sustain important ecological communities, determine habitats for fish, ...

Accurate determination of dynamic topography (DT) is expected to quantify a realistic sea surface with respect its vertical datum and in identifying sub-mesoscale features ocean dynamics. This study explores method that derives DT by using satellite altimetry (SA) conjunction high-resolution marine geoid model. To assess the method, was computed along-track SA from Sentinel- 3A (S3A), Sentinel-...

M than 60% of the Earth’s land and shallow marine areas are covered by > 2 km of sediments and sedimentary rocks, with the thickest accumulations on rifted continental margins (Figure 1). Free-air marine gravity anomalies derived from Geosat and ERS-1 satellite altimetry (Fairhead et al., 2001; Sandwell and Smith, 2009; Andersen et al., 2009) outline most of these major basins with remarkable p...