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M. Becker - One of the best experts on this subject based on the ideXlab platform.
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is coastal mean sea level rising faster than the global mean a comparison between tide gauges and Satellite Altimetry over 1993 2007
Geophysical Research Letters, 2009Co-Authors: Pierre Prandi, Anny Cazenave, M. BeckerAbstract:[1] Based on a careful selection of tide gauges records from the Global Sea Level Observing System network, we investigate whether coastal mean sea level is rising faster than the global mean derived from Satellite Altimetry over the January 1993–December 2007 time span. Over this 15-year time span, mean coastal rate of sea level rise is found to be +3.3 ± 0.5 mm/yr, in good agreement with the Altimetry-derived rate of +3.4 ± 0.1 mm/yr. Tests indicate that the trends are statistically significant, hence coastal sea level does not rise faster than the global mean. Although trends agree well, tide gauges-based mean sea level exhibits much larger interannual variability than Altimetry-based global mean. Interannual variability in coastal sea level appears related to the regional variability in sea level rates reported by Satellite Altimetry. When global mean sea level is considered (as allowed by Satellite Altimetry coverage), interannual variability is largely smoothed out.
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Is coastal mean sea level rising faster than the global mean? A comparison between tide gauges and Satellite Altimetry over 1993-2007
Geophysical Research Letters, 2009Co-Authors: Pierre Prandi, Anny Cazenave, M. BeckerAbstract:Based on a careful selection of tide gauges records from the Global Sea Level Observing System network, we investigate whether coastal mean sea level is rising faster than the global mean derived from Satellite Altimetry over the January 1993-December 2007 time span. Over this 15-year time span, mean coastal rate of sea level rise is found to be + 3.3 +/- 0.5 mm/yr, in good agreement with the Altimetry-derived rate of + 3.4 +/- 0.1 mm/yr. Tests indicate that the trends are statistically significant, hence coastal sea level does not rise faster than the global mean. Although trends agree well, tide gauges-based mean sea level exhibits much larger interannual variability than Altimetry-based global mean. Interannual variability in coastal sea level appears related to the regional variability in sea level rates reported by Satellite Altimetry. When global mean sea level is considered (as allowed by Satellite Altimetry coverage), interannual variability is largely smoothed out. Citation: Prandi, P., A. Cazenave, and M. Becker (2009), Is coastal mean sea level rising faster than the global mean? A comparison between tide gauges and Satellite Altimetry over 1993-2007, Geophys. Res. Lett., 36, L05602, doi:10.1029/2008GL036564.
Pierre Prandi - One of the best experts on this subject based on the ideXlab platform.
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A New Estimation of Mean Sea Level in the Arctic Ocean from Satellite Altimetry
Marine Geodesy, 2012Co-Authors: Pierre Prandi, Michael Ablain, Anny Cazenave, Nicolas PicotAbstract:Sea level monitoring in the Arctic Ocean can provide useful information in the context of a rapid change of several parts of the Arctic climate system. Satellite Altimetry systems are affected by various problems at high latitudes. As a consequence, no precise and reliable mean sea level record is available yet from Altimetry products. After identifying some of the issues that affect Satellite Altimetry in the Arctic Ocean region, we describe the tailored processing that has been applied to along-track mono-mission Altimetry data. We generate a new dataset of weekly gridded sea level anomaly fields over the Arctic region for the period spanning from 1993 to 2009 based on multiSatellite Altimetry missions. We demonstrate the improvements achieved by this new dataset, among which a better data coverage. The grids are used to describe some features of mean sea level variability in the Arctic Ocean both at basin-wide and local scales. The regional trend estimated for the Arctic Ocean mean sea level over all l...
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Sea level variability in the Arctic Ocean observed by Satellite Altimetry
Ocean Science Discussions, 2012Co-Authors: Pierre Prandi, Michael Ablain, Anny Cazenave, Nicolas PicotAbstract:Abstract. We investigate sea level variability in the Arctic Ocean from observations. Variability estimates are derived both at the basin scale and on smaller local spatial scales. The periods of the signals studied vary from high frequency (intra-annual) to long term trends. We also investigate the mechanisms responsible for the observed variability. Different data types are used, the main one being a recent reprocessing of Satellite Altimetry data in the Arctic Ocean. Satellite Altimetry data is compared to tide gauges measurements, steric sea level derived from temperature and salinity fields and GRACE ocean mass estimates. We establish a consistent regional sea level budget over the GRACE availability era (2003–2009) showing that the sea level drop observed by Altimetry over this period is driven by ocean mass loss rather than steric effects. The comparison of Altimetry and tide gauges time series show that the two techniques are in good agreement regarding sea level trends. Coastal areas of high variability in the Altimetry record are also consistent with tide gauges records. An EOF analysis of September mean Altimetry fields allows identifying two regions of wind driven variability in the Arctic Ocean: the Beaufort Gyre region and the coastal European and Russian Arctic. Such patterns are related to atmospheric regimes through the Arctic Oscillation and Dipole Anomaly.
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is coastal mean sea level rising faster than the global mean a comparison between tide gauges and Satellite Altimetry over 1993 2007
Geophysical Research Letters, 2009Co-Authors: Pierre Prandi, Anny Cazenave, M. BeckerAbstract:[1] Based on a careful selection of tide gauges records from the Global Sea Level Observing System network, we investigate whether coastal mean sea level is rising faster than the global mean derived from Satellite Altimetry over the January 1993–December 2007 time span. Over this 15-year time span, mean coastal rate of sea level rise is found to be +3.3 ± 0.5 mm/yr, in good agreement with the Altimetry-derived rate of +3.4 ± 0.1 mm/yr. Tests indicate that the trends are statistically significant, hence coastal sea level does not rise faster than the global mean. Although trends agree well, tide gauges-based mean sea level exhibits much larger interannual variability than Altimetry-based global mean. Interannual variability in coastal sea level appears related to the regional variability in sea level rates reported by Satellite Altimetry. When global mean sea level is considered (as allowed by Satellite Altimetry coverage), interannual variability is largely smoothed out.
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Is coastal mean sea level rising faster than the global mean? A comparison between tide gauges and Satellite Altimetry over 1993-2007
Geophysical Research Letters, 2009Co-Authors: Pierre Prandi, Anny Cazenave, M. BeckerAbstract:Based on a careful selection of tide gauges records from the Global Sea Level Observing System network, we investigate whether coastal mean sea level is rising faster than the global mean derived from Satellite Altimetry over the January 1993-December 2007 time span. Over this 15-year time span, mean coastal rate of sea level rise is found to be + 3.3 +/- 0.5 mm/yr, in good agreement with the Altimetry-derived rate of + 3.4 +/- 0.1 mm/yr. Tests indicate that the trends are statistically significant, hence coastal sea level does not rise faster than the global mean. Although trends agree well, tide gauges-based mean sea level exhibits much larger interannual variability than Altimetry-based global mean. Interannual variability in coastal sea level appears related to the regional variability in sea level rates reported by Satellite Altimetry. When global mean sea level is considered (as allowed by Satellite Altimetry coverage), interannual variability is largely smoothed out. Citation: Prandi, P., A. Cazenave, and M. Becker (2009), Is coastal mean sea level rising faster than the global mean? A comparison between tide gauges and Satellite Altimetry over 1993-2007, Geophys. Res. Lett., 36, L05602, doi:10.1029/2008GL036564.
Anny Cazenave - One of the best experts on this subject based on the ideXlab platform.
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A New Estimation of Mean Sea Level in the Arctic Ocean from Satellite Altimetry
Marine Geodesy, 2012Co-Authors: Pierre Prandi, Michael Ablain, Anny Cazenave, Nicolas PicotAbstract:Sea level monitoring in the Arctic Ocean can provide useful information in the context of a rapid change of several parts of the Arctic climate system. Satellite Altimetry systems are affected by various problems at high latitudes. As a consequence, no precise and reliable mean sea level record is available yet from Altimetry products. After identifying some of the issues that affect Satellite Altimetry in the Arctic Ocean region, we describe the tailored processing that has been applied to along-track mono-mission Altimetry data. We generate a new dataset of weekly gridded sea level anomaly fields over the Arctic region for the period spanning from 1993 to 2009 based on multiSatellite Altimetry missions. We demonstrate the improvements achieved by this new dataset, among which a better data coverage. The grids are used to describe some features of mean sea level variability in the Arctic Ocean both at basin-wide and local scales. The regional trend estimated for the Arctic Ocean mean sea level over all l...
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Sea level variability in the Arctic Ocean observed by Satellite Altimetry
Ocean Science Discussions, 2012Co-Authors: Pierre Prandi, Michael Ablain, Anny Cazenave, Nicolas PicotAbstract:Abstract. We investigate sea level variability in the Arctic Ocean from observations. Variability estimates are derived both at the basin scale and on smaller local spatial scales. The periods of the signals studied vary from high frequency (intra-annual) to long term trends. We also investigate the mechanisms responsible for the observed variability. Different data types are used, the main one being a recent reprocessing of Satellite Altimetry data in the Arctic Ocean. Satellite Altimetry data is compared to tide gauges measurements, steric sea level derived from temperature and salinity fields and GRACE ocean mass estimates. We establish a consistent regional sea level budget over the GRACE availability era (2003–2009) showing that the sea level drop observed by Altimetry over this period is driven by ocean mass loss rather than steric effects. The comparison of Altimetry and tide gauges time series show that the two techniques are in good agreement regarding sea level trends. Coastal areas of high variability in the Altimetry record are also consistent with tide gauges records. An EOF analysis of September mean Altimetry fields allows identifying two regions of wind driven variability in the Arctic Ocean: the Beaufort Gyre region and the coastal European and Russian Arctic. Such patterns are related to atmospheric regimes through the Arctic Oscillation and Dipole Anomaly.
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is coastal mean sea level rising faster than the global mean a comparison between tide gauges and Satellite Altimetry over 1993 2007
Geophysical Research Letters, 2009Co-Authors: Pierre Prandi, Anny Cazenave, M. BeckerAbstract:[1] Based on a careful selection of tide gauges records from the Global Sea Level Observing System network, we investigate whether coastal mean sea level is rising faster than the global mean derived from Satellite Altimetry over the January 1993–December 2007 time span. Over this 15-year time span, mean coastal rate of sea level rise is found to be +3.3 ± 0.5 mm/yr, in good agreement with the Altimetry-derived rate of +3.4 ± 0.1 mm/yr. Tests indicate that the trends are statistically significant, hence coastal sea level does not rise faster than the global mean. Although trends agree well, tide gauges-based mean sea level exhibits much larger interannual variability than Altimetry-based global mean. Interannual variability in coastal sea level appears related to the regional variability in sea level rates reported by Satellite Altimetry. When global mean sea level is considered (as allowed by Satellite Altimetry coverage), interannual variability is largely smoothed out.
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Is coastal mean sea level rising faster than the global mean? A comparison between tide gauges and Satellite Altimetry over 1993-2007
Geophysical Research Letters, 2009Co-Authors: Pierre Prandi, Anny Cazenave, M. BeckerAbstract:Based on a careful selection of tide gauges records from the Global Sea Level Observing System network, we investigate whether coastal mean sea level is rising faster than the global mean derived from Satellite Altimetry over the January 1993-December 2007 time span. Over this 15-year time span, mean coastal rate of sea level rise is found to be + 3.3 +/- 0.5 mm/yr, in good agreement with the Altimetry-derived rate of + 3.4 +/- 0.1 mm/yr. Tests indicate that the trends are statistically significant, hence coastal sea level does not rise faster than the global mean. Although trends agree well, tide gauges-based mean sea level exhibits much larger interannual variability than Altimetry-based global mean. Interannual variability in coastal sea level appears related to the regional variability in sea level rates reported by Satellite Altimetry. When global mean sea level is considered (as allowed by Satellite Altimetry coverage), interannual variability is largely smoothed out. Citation: Prandi, P., A. Cazenave, and M. Becker (2009), Is coastal mean sea level rising faster than the global mean? A comparison between tide gauges and Satellite Altimetry over 1993-2007, Geophys. Res. Lett., 36, L05602, doi:10.1029/2008GL036564.
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Satellite Altimetry and earth sciences a handbook of techniques and applications
2001Co-Authors: Anny CazenaveAbstract:The new level of precision and global coverage provided by Satellite Altimetry is rapidly advancing studies of ocean circulation. It allows for new insights into marine geodesy, ice sheet movements, plate tectonics, and for the first time provides high-resolution bathymetry for previously unmapped regions of our watery planet and crucial information on the large-scale ocean features on intra-season to interannual time scales. Satellite Altimetry and Earth Sciences has integrated the expertise of the leading international researchers to demonstrate the techniques, missions, and accuracy of Satellite Altimetry, including altimeter measurements, orbit determination, and ocean circulation models. Satellite Altimetry is helping to advance studies of ocean circulation, tides, sea level, surface waves and allowing new insights into marine geodesy. Satellite Altimetry and Earth Sciences provides high resolution bathymetry for previously unmapped regions of our watery planet. Satellite Altimetry and Earth Sciences is for a very broad spectrum of academics, graduate students, and researchers in geophysics, oceanography, and the space and earth sciences. International agencies that fund Satellite-based research will also appreciate the handy reference on the applications of Satellite Altimetry.
Yutaka Hayashi - One of the best experts on this subject based on the ideXlab platform.
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extracting the 2004 indian ocean tsunami signals from sea surface height data observed by Satellite Altimetry
Journal of Geophysical Research, 2008Co-Authors: Yutaka HayashiAbstract:[1] Altimeter-equipped Satellites flew over the propagating area of the Indian Ocean tsunami caused by the 2004 Sumatra-Andaman earthquake on 26 December 2004. Tsunami signals can be detected as differences in sea level changes of multiple tracks. However, observed changes in sea level differences involve not only tsunami signals but also effects from various ocean phenomena and errors due to observation technology and data processing. A multiSatellite time-spatial interpolation method is performed to define reference sea surface heights. After applying the method to the products on sea level anomalies along tracks of altimeter-equipped Satellites, quality tsunami-height profiles with only 4- to 5-cm root mean square errors were obtained for the Indian Ocean tsunami along five tracks from four Satellites (Jason-1, TOPEX/POSEIDON, ENVISAT, and Geosat Follow-On). Maximum tsunami height in the open ocean for the 2004 Indian Ocean tsunami as observed from Satellite Altimetry was 1.1 m trough-to-crest 115 min after the main shock. Reliable tsunami-height profiles from Satellite Altimetry were extracted for the first time. The method employed in this study has the potential to extract tsunami signals of 0.1 m or greater trough-to-crest height from Satellite Altimetry observation data on the deep sea by ongoing Satellite missions.
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the 2004 indian ocean tsunami tsunami source model from Satellite Altimetry
Earth Planets and Space, 2006Co-Authors: K Hirata, Kenji Satake, Yuichiro Tanioka, Tsurane Kuragano, Yohei Hasegawa, Yutaka Hayashi, Nobuo HamadaAbstract:Satellite Altimetry measurements of sea surface heights for the first-time captured the Indian Ocean tsunami generated from the December 2004 great Sumatra earthquake. Analysis of the sea surface height profile suggests that the tsunami source, or the seafloor deformation, of the great earthquake propagated to the north at an extremely slow speed of less than 1 km/sec on average for the entire 1300-km-long segment along the northern Sumatra-Nicobar-Andaman Trench. The extremely slow propagation speed produces a very long duration of tens minutes, longer than earthquake source duration estimated (480–500 sec) from short-period P-wave radiation. The Satellite Altimetry data requires a total seismic moment of 9.86 × 1022 Nm (Mw=9.3). This estimate is approximately 2.5 times larger than the value from long-period surface wave analysis but nearly the same as that from the ultra-long-period normal mode study. The maximum amount of slip (∼30 m) is identified in an offshore region closest to the northern most part of Sumatra where the largest tsunami run-up heights were observed.
Nina Ridder - One of the best experts on this subject based on the ideXlab platform.
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Understanding the spatial variation of sea level rise in the North Sea using Satellite Altimetry
Journal of Geophysical Research: Oceans, 2017Co-Authors: Paul Sterlini, Dewi Le Bars, Hylke De Vries, Nina RidderAbstract:This paper examines the spatial variation of sea surface height trends in the North Sea Basin as seen by Satellite Altimetry and assesses its underlying causes. Changes in the potential temperature and salinity of the North Sea are transposed into corresponding changes in sea surface height and regional anomalies of linear sea level trend calculated. The same is carried out for the meteorological processes which act on the sea surface. The steric and meteorological regional sea level rise anomalies are summed with those from contributions from land ice and compared against the values seen by Satellite Altimetry over the period 1993–2014. Results show that there is good agreement between the observations and the reconstruction. The local meteorological contribution appears to be most important in describing regional variation in linear sea level rise and is reinforced with a local halosteric contribution which shows a similar spatial pattern.
