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Article ; Online: River Flow Monitoring by Sentinel-3 OLCI and MODIS

Angelica Tarpanelli / Filippo Iodice / Luca Brocca / Marco Restano / Jérôme Benveniste

Remote Sensing, Vol 12, Iss 3867, p

Comparison and Combination

2020 Volume 3867

Abstract: The monitoring of rivers by satellite is an up-to-date subject in hydrological studies as confirmed by the interest of space agencies to finance specific missions that respond to the quantification of surface water flows. We address the problem by using ... ...

Abstract	The monitoring of rivers by satellite is an up-to-date subject in hydrological studies as confirmed by the interest of space agencies to finance specific missions that respond to the quantification of surface water flows. We address the problem by using multi-spectral sensors, in the near-infrared (NIR) band, correlating the reflectance ratio between a dry and a wet pixel extracted from a time series of images, the C/M ratio, with five river flow-related variables: water level, river discharge, flow area, mean flow velocity and surface width. The innovative aspect of this study is the use of the Ocean and Land Colour Instrument (OLCI) on board Sentinel-3 satellites, compared to the Moderate Resolution Imaging Spectroradiometer (MODIS) used in previous studies. Our results show that the C/M ratio from OLCI and MODIS is more correlated with the mean flow velocity than with other variables. To improve the number of observations, OLCI and MODIS products are combined into multi-mission time series. The integration provides good quality data at around daily resolution, appropriate for the analysis of the Po River investigated in this study. Finally, the combination of only MODIS products outperforms the other configurations with a frequency slightly lower (~1.8 days).
Keywords	Sentinel-3 OLCI ; MODIS ; river discharge ; Po River ; multi-mission series ; Science ; Q
Subject code	333
Language	English
Publishing date	2020-11-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Local sea level trends, accelerations and uncertainties over 1993–2019

Pierre Prandi / Benoit Meyssignac / Michaël Ablain / Giorgio Spada / Aurélien Ribes / Jérôme Benveniste

Scientific Data, Vol 8, Iss 1, Pp 1-

2021 Volume 12

Abstract: Measurement(s) sea surface height Technology Type(s) satellite radar altimetry Factor Type(s) year of data collection Sample Characteristic - Environment sea • ocean Sample Characteristic - Location global Machine-accessible metadata file describing the ... ...

Abstract	Measurement(s) sea surface height Technology Type(s) satellite radar altimetry Factor Type(s) year of data collection Sample Characteristic - Environment sea • ocean Sample Characteristic - Location global Machine-accessible metadata file describing the reported data: https://doi.org/10.6084/m9.figshare.13297757
Keywords	Science ; Q
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Sea level along the world’s coastlines can be measured by a network of virtual altimetry stations

Anny Cazenave / Yvan Gouzenes / Florence Birol / Fabien Leger / Marcello Passaro / Francisco M. Calafat / Andrew Shaw / Fernando Nino / Jean François Legeais / Julius Oelsmann / Marco Restano / Jérôme Benveniste

Communications Earth & Environment, Vol 3, Iss 1, Pp 1-

2022 Volume 9

Abstract: Sea level trends at decadal timescales within 20 km of the world’s coastlines can be determined for the period 2002 to 2019 through dedicated reprocessing of high-resolution along-track altimetry data. ...

Abstract	Sea level trends at decadal timescales within 20 km of the world’s coastlines can be determined for the period 2002 to 2019 through dedicated reprocessing of high-resolution along-track altimetry data.
Keywords	Geology ; QE1-996.5 ; Environmental sciences ; GE1-350
Language	English
Publishing date	2022-05-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: ALES+: Adapting a homogenous ocean retracker for satellite altimetry to sea ice leads, coastal and inland waters

Passaro, Marcello / Denise Dettmering / Eva Boergens / Francisco M. Calafat / Jérôme Benveniste / Ole B. Andersen / Stine Kildegaard Rose

Remote sensing of environment. 2018 June 15, v. 211

2018

Abstract: Water level from sea ice-covered oceans is particularly challenging to retrieve with satellite radar altimeters due to the different shapes assumed by the returned signal compared with the standard open ocean waveforms. Valid measurements are scarce in ... ...

Abstract	Water level from sea ice-covered oceans is particularly challenging to retrieve with satellite radar altimeters due to the different shapes assumed by the returned signal compared with the standard open ocean waveforms. Valid measurements are scarce in large areas of the Arctic and Antarctic Oceans, because sea level can only be estimated in the openings in the sea ice (leads and polynyas). Similar signal-related problems affect also measurements in coastal and inland waters.This study presents a fitting (also called retracking) strategy (ALES+) based on a subwaveform retracker that is able to adapt the fitting of the signal depending on the sea state and on the slope of its trailing edge. The algorithm modifies the existing Adaptive Leading Edge Subwaveform retracker originally designed for coastal waters, and is applied to Envisat and ERS-2 missions.The validation in a test area of the Arctic Ocean demonstrates that the presented strategy is more precise than the dedicated ocean and sea ice retrackers available in the mission products. It decreases the retracking open ocean noise by over 1 cm with respect to the standard ocean retracker and is more precise by over 1 cm with respect to the standard sea ice retracker used for fitting specular echoes. Compared to an existing open ocean altimetry dataset, the presented strategy increases the number of sea level retrievals in the sea ice-covered area and the correlation with a local tide gauge. Further tests against in-situ data show that also the quality of coastal retrievals increases compared to the standard ocean product in the last 6 km within the coast.ALES+ improves the sea level determination at high latitudes and is adapted to fit reflections from any water surface. If used in the open ocean and in the coastal zone, it improves the current official products based on ocean retrackers. First results in the inland waters show that the correlation between water heights from ALES+ and from in-situ measurement is always over 0.95.
Keywords	algorithms ; coastal water ; coasts ; data collection ; ice ; inland waters ; latitude ; oceans ; radar ; remote sensing ; satellites ; sea level ; Arctic region
Language	English
Dates of publication	2018-0615
Size	p. 456-471.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	431483-9
ISSN	0034-4257
ISSN	0034-4257
DOI	10.1016/j.rse.2018.02.074
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Absolute Baltic Sea Level Trends in the Satellite Altimetry Era

Marcello Passaro / Felix L. Müller / Julius Oelsmann / Laura Rautiainen / Denise Dettmering / Michael G. Hart-Davis / Adili Abulaitijiang / Ole B. Andersen / Jacob L. Høyer / Kristine S. Madsen / Ida Margrethe Ringgaard / Jani Särkkä / Rory Scarrott / Christian Schwatke / Florian Seitz / Laura Tuomi / Marco Restano / Jérôme Benveniste

Frontiers in Marine Science, Vol

A Revisit

2021 Volume 8

Abstract: The absolute sea level trend from May 1995 to May 2019 in the Baltic Sea is analyzed by means of a regional monthly gridded dataset based on a dedicated processing of satellite altimetry data. In addition, we evaluate the role of the North Atlantic ... ...

Abstract	The absolute sea level trend from May 1995 to May 2019 in the Baltic Sea is analyzed by means of a regional monthly gridded dataset based on a dedicated processing of satellite altimetry data. In addition, we evaluate the role of the North Atlantic Oscillation and the wind patterns in shaping differences in sea level trend and variability at a sub-basin scale. To compile the altimetry dataset, we use information collected in coastal areas and from leads within sea-ice. The dataset is validated by comparison with tide gauges and the available global gridded altimetry products. The agreement between trends computed from satellite altimetry and tide gauges improves by 9%. The rise in sea level is statistically significant in the entire region of study and higher in winter than in summer. A gradient of over 3 mm/yr in sea level rise is observed, with the north and east of the basin rising more than the south-west. Part of this gradient (about 1 mm/yr) is directly explained by a regression analysis of the wind contribution on the sea level time series. A sub-basin analysis comparing the northernmost part (Bay of Bothnia) with the south-west reveals that the differences in winter sea level anomalies are related to different phases of the North-Atlantic Oscillation (0.71 correlation coefficient). Sea level anomalies are higher in the Bay of Bothnia when winter wind forcing pushes waters through Ekman transport from the south-west toward east and north. The study also demonstrates the maturity of enhanced satellite altimetry products to support local sea level studies in areas characterized by complex coastlines or sea-ice coverage. The processing chain used in this study can be exported to other regions, in particular to test the applicability in regions affected by larger ocean tides.
Keywords	sea level ; satellite altimetry ; North Atlantic Oscillation (NAO index) ; Baltic Sea ; coastal altimetry ; Science ; Q ; General. Including nature conservation ; geographical distribution ; QH1-199.5
Subject code	551
Language	English
Publishing date	2021-05-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Observational Requirements for Long-Term Monitoring of the Global Mean Sea Level and Its Components Over the Altimetry Era

Anny Cazenave / Ben Hamlington / Martin Horwath / Valentina R. Barletta / Jérôme Benveniste / Don Chambers / Petra Döll / Anna E. Hogg / Jean François Legeais / Mark Merrifield / Benoit Meyssignac / Garry Mitchum / Steve Nerem / Roland Pail / Hindumathi Palanisamy / Frank Paul / Karina von Schuckmann / Philip Thompson

Frontiers in Marine Science, Vol

2019 Volume 6

Abstract: Present-day global mean sea level rise is caused by ocean thermal expansion, ice mass loss from glaciers and ice sheets, as well as changes in terrestrial water storage. For that reason, sea level is one of the best indicators of climate change as it ... ...

Abstract	Present-day global mean sea level rise is caused by ocean thermal expansion, ice mass loss from glaciers and ice sheets, as well as changes in terrestrial water storage. For that reason, sea level is one of the best indicators of climate change as it integrates the response of several components of the climate system to internal and external forcing factors. Monitoring the global mean sea level allows detecting changes (e.g., in trend or acceleration) in one or more components. Besides, assessing closure of the sea level budget allows us to check whether observed sea level change is indeed explained by the sum of changes affecting each component. If not, this would reflect errors in some of the components or missing contributions not accounted for in the budget. Since the launch of TOPEX/Poseidon in 1992, a precise 27-year continuous record of sea level change is available. It has allowed major advances in our understanding of how the Earth is responding to climate change. The last two decades are also marked by the launch of the GRACE satellite gravity mission and the development of the Argo network of profiling floats. GRACE space gravimetry allows the monitoring of mass redistributions inside the Earth system, in particular land ice mass variations as well as changes in terrestrial water storage and in ocean mass, while Argo floats allow monitoring sea water thermal expansion due to the warming of the oceans. Together, satellite altimetry, space gravity, and Argo measurements provide unprecedented insight into the magnitude, spatial variability, and causes of present-day sea level change. With this observational network, we are now in a position to address many outstanding questions that are important to planning for future sea level rise. Here, we detail the network for observing sea level and its components, underscore the importance of these observations, and emphasize the need to maintain current systems, improve their sensors, and supplement the observational network where gaps in our knowledge remain.
Keywords	sea-level change ; satellite altimetry ; GRACE (gravity recovery and climate experiment) ; Argo float array ; sea level budget ; Science ; Q ; General. Including nature conservation ; geographical distribution ; QH1-199.5
Subject code	333
Language	English
Publishing date	2019-09-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Preface to the Special Issue on Satellite Altimetry over Land and Coastal Zones

Cheinway Hwang / Jérôme Benveniste / Yamin Dang / and C. K. Shum

Terrestrial, Atmospheric and Oceanic Sciences, Vol 19, Iss 1-2, p

Applications and Challenges

2008

Abstract: This special issue publishes peer reviewed papers stemming from the International Workshop on Coast and Land applications of satellite altimetry, held 21 -22 July 2006, Beijing, China. This workshop is financially supported by the Chinese Academy of ... ...

Abstract	This special issue publishes peer reviewed papers stemming from the International Workshop on Coast and Land applications of satellite altimetry, held 21 -22 July 2006, Beijing, China. This workshop is financially supported by the Chinese Academy of Surveying and Mapping, National Chiao Tung University, Asia GIS and GPS Co., Chung-Hsing Surv. Co., Huanyu Surv. Eng. Cons. Inc., and Real-World Eng. Cons. Inc. Twenty-two papers were submitted to this issue for review, and 16 papers were accepted following an iterative peer-review process. The accepted papers cover subjects on: ICESat coastal altimetry (1), satellite altimetry applications in solid earth sciences (2), hydrology (4), land/coast gravity field modeling (4), and coastal oceanography (5).
Keywords	geophysics ; geology ; atmospheric science ; space science ; oceanic science ; hydrology ; QE1-996.5 ; Geophysics. Cosmic physics ; QC801-809
Language	English
Publishing date	2008-01-01T00:00:00Z
Publisher	Springer
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Preface to the Special Issue on Satellite Altimetry over Land and Coastal Zones

Cheinway Hwang / Jérôme Benveniste / Yamin Dang / C. K. Shum

Terrestrial, Atmospheric and Oceanic Sciences, Vol 19, Iss 1, p

Applications and Challenges

2008 Volume 000

Abstract	This special issue publishes peer reviewed papers stemming from the International Workshop on Coast and Land applications of satellite altimetry, held 21 -22 July 2006, Beijing, China. This workshop is financially supported by the Chinese Academy of Surveying and Mapping, National Chiao Tung University, Asia GIS and GPS Co., Chung-Hsing Surv. Co., Huanyu Surv. Eng. Cons. Inc., and Real-World Eng. Cons. Inc. Twenty-two papers were submitted to this issue for review, and 16 papers were accepted following an iterative peer-review process. The accepted papers cover subjects on: ICESat coastal altimetry (1), satellite altimetry applications in solid earth sciences (2), hydrology (4), land/coast gravity field modeling (4), and coastal oceanography (5).
Keywords	Geography (General) ; G1-922 ; Geology ; QE1-996.5
Language	English
Publishing date	2008-01-01T00:00:00Z
Publisher	Chinese Geoscience Union
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Arctic Sea level Budget Assessment During the GRACE/Argo Time Period

Roshin P. Raj / Ole B. Andersen / Johnny A. Johannessen / Benjamin D. Gutknecht / Sourav Chatterjee / Stine K. Rose / Antonio Bonaduce / Martin Horwath / Heidi Ranndal / Kristin Richter / Hindumathi Palanisamy / Carsten A. Ludwigsen / Laurent Bertino / J. Even Ø. Nilsen / Per Knudsen / Anna Hogg / Anny Cazenave / Jérôme Benveniste

Remote Sensing, Vol 12, Iss 2837, p

2020 Volume 2837

Abstract: Sea level change is an important indicator of climate change. Our study focuses on the sea level budget assessment of the Arctic Ocean using: (1) the newly reprocessed satellite altimeter data with major changes in the processing techniques; (2) ocean ... ...

Abstract	Sea level change is an important indicator of climate change. Our study focuses on the sea level budget assessment of the Arctic Ocean using: (1) the newly reprocessed satellite altimeter data with major changes in the processing techniques; (2) ocean mass change data derived from GRACE satellite gravimetry; (3) and steric height estimated from gridded hydrographic data for the GRACE/Argo time period (2003–2016). The Beaufort Gyre (BG) and the Nordic Seas (NS) regions exhibit the largest positive trend in sea level during the study period. Halosteric sea level change is found to dominate the area averaged sea level trend of BG, while the trend in NS is found to be influenced by halosteric and ocean mass change effects. Temporal variability of sea level in these two regions reveals a significant shift in the trend pattern centered around 2009–2011. Analysis suggests that this shift can be explained by a change in large-scale atmospheric circulation patterns over the Arctic. The sea level budget assessment of the Arctic found a residual trend of more than 1.0 mm/yr. This nonclosure of the sea level budget is further attributed to the limitations of the three above mentioned datasets in the Arctic region.
Keywords	sea level ; satellite altimetry ; GRACE ; ocean mass change ; steric height ; Arctic Oscillation ; Science ; Q
Language	English
Publishing date	2020-09-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A new phase in the production of quality-controlled sea level data

Graham D. Quartly / Jean-François Legeais / Michaël Ablain / Lionel Zawadzki / M. Joana Fernandes / Sergiy Rudenko / Loren Carrère / Pablo Nilo García / Paolo Cipollini / Ole B. Andersen / Jean-Christophe Poisson / Sabrina Mbajon Njiche / Anny Cazenave / Jérôme Benveniste

Earth System Science Data

2017

Publishing country	de
Document type	Article ; Online
DOI	10.5194/essd-9-557-2017
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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