Lars Stenseng
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View article: Experimental Determination of the Ionospheric Effects and Cycle Slip Phenomena for Galileo and GPS in the Arctic
Experimental Determination of the Ionospheric Effects and Cycle Slip Phenomena for Galileo and GPS in the Arctic Open
The ionosphere can impair the accuracy, availability and reliability of satellite-based positioning, navigation and timing. The Arctic region is particularly affected by strong ionospheric gradients and phase scintillation, posing a safety…
View article: Assimilating CryoSat-2 freeboard to improve Arctic sea ice thickness estimates
Assimilating CryoSat-2 freeboard to improve Arctic sea ice thickness estimates Open
In this study, a new method to assimilate freeboard (FB) derived from satellite radar altimetry is presented with the goal of improving the initial state of sea ice thickness predictions in the Arctic. In order to quantify the improvement …
View article: Comment on tc-2022-262
Comment on tc-2022-262 Open
Abstract. In this study, a new method to assimilate satellite radar altimetry derived freeboard instead of sea ice thickness is presented with the goal of improving the initial state of sea ice thickness predictions in the Arctic. In order…
View article: Comment on tc-2022-262
Comment on tc-2022-262 Open
Abstract. In this study, a new method to assimilate satellite radar altimetry derived freeboard instead of sea ice thickness is presented with the goal of improving the initial state of sea ice thickness predictions in the Arctic. In order…
View article: Assimilating CryoSat-2 freeboard to improve Arctic sea ice thickness estimates
Assimilating CryoSat-2 freeboard to improve Arctic sea ice thickness estimates Open
In this study, a new method to assimilate satellite radar altimetry derived freeboard instead of sea ice thickness is presented with the goal of improving the initial state of sea ice thickness predictions in the Arctic. In order to quanti…
View article: Comment on tc-2022-84
Comment on tc-2022-84 Open
Sea ice models fill many purposes. They are used in global climate models or for short term forecasts to plan shipping routes. No matter what their output is used for, understanding the cause for there variability is crucial. In the this s…
View article: Arctic sea ice and snow from different ice models: A CICE–SI3 intercomparison study
Arctic sea ice and snow from different ice models: A CICE–SI3 intercomparison study Open
Sea ice models fill many purposes. They are used in global climate models or for short term forecasts to plan shipping routes. No matter what their output is used for, understanding the cause for there variability is crucial. In the this s…
View article: Assimilating Cyrosat2 freeboard into a coupled ice-ocean model  
Assimilating Cyrosat2 freeboard into a coupled ice-ocean model   Open
<div>This presentation introduces a method to assimilate freeboard from radar satellite observations.</div><div>Many studies have shown that the skill and memory of sea ice models using sea ice thickness as initial condit…
View article: Improving Arctic Sea Ice Prediction Though Freeboard Assimilation
Improving Arctic Sea Ice Prediction Though Freeboard Assimilation Open
<p>With the presented work we aim to improve sea ice forecasts and our understanding of Arcitc sea ice formation though freeboard assimilation. Over the last years understanding Arctic sea ice changes and being able to make a reliabl…
View article: SEASTAR: A Mission to Study Ocean Submesoscale Dynamics and Small-Scale Atmosphere-Ocean Processes in Coastal, Shelf and Polar Seas
SEASTAR: A Mission to Study Ocean Submesoscale Dynamics and Small-Scale Atmosphere-Ocean Processes in Coastal, Shelf and Polar Seas Open
High-resolution satellite images of ocean color and sea surface temperature reveal an abundance of ocean fronts, vortices and filaments at scales below 10 km but measurements of ocean surface dynamics at these scales are rare. There is inc…
View article: Greenland ice sheet mass balance assessed by PROMICE (1995–2015)
Greenland ice sheet mass balance assessed by PROMICE (1995–2015) Open
The Programme for Monitoring of the Greenland Ice Sheet (PROMICE) has measured ice-sheet elevation and thickness via repeat airborne surveys circumscribing the ice sheet at an average elevation of 1708 ± 5 m (Sørensen et al. 2018). We refe…
View article: Validation of CryoSat-2 SARIn Data over Austfonna Ice Cap Using Airborne Laser Scanner Measurements
Validation of CryoSat-2 SARIn Data over Austfonna Ice Cap Using Airborne Laser Scanner Measurements Open
The study presented here is focused on the assessment of surface elevations derived from CryoSat-2 SARIn level 1b data over the Austfonna ice cap, Svalbard, in 2016. The processing chain that must be applied to the CryoSat-2 waveforms to d…
View article: Circum-Greenland, ice-thickness measurements collected during PROMICE airborne surveys in 2007, 2011 and 2015
Circum-Greenland, ice-thickness measurements collected during PROMICE airborne surveys in 2007, 2011 and 2015 Open
The Greenland ice sheet has experienced an average mass loss of 142 ± 49 Gt/yr from 1992 to 2011 (Shepherd et al. 2012), making it a significant contributor to sea-level rise. Part of the ice- sheet mass loss is the result of increased dyn…
View article: Multi-Mission Based River Levels
Multi-Mission Based River Levels Open
Rivers levels typically show large seasonal variations. In Arctic rivers, the water level rises rather quickly in the spring when the snow and ice are melting. This abrupt rise is challenging to capture for missions such as Sentinel-3 and …
View article: A New DTU18 MSS Mean Sea Surface – Improvement from SAR Altimetry
A New DTU18 MSS Mean Sea Surface – Improvement from SAR Altimetry Open
In this presentation we outline the new DTU18MSS mean sea surface which is the latest release of the global high resolution mean sea surface from DTU Space. The major new advance leading up to the release of this DTU18MSS the use of 3 year…
View article: Three Decades of Volume Change of a Small Greenlandic Glacier Using Ground Penetrating Radar, Structure from Motion, and Aerial Photogrammetry
Three Decades of Volume Change of a Small Greenlandic Glacier Using Ground Penetrating Radar, Structure from Motion, and Aerial Photogrammetry Open
Glaciers in the Arctic are losing mass at an increasing rate. Here we use surface topography derived from Structure from Motion (SfM) and ice volume from ground penetrating radar (GPR) to describe the 2014 state of Aqqutikitsoq glacier (2.…
View article: The Performance and Potentials of the CryoSat-2 SAR and SARIn Modes for Lake Level Estimation
The Performance and Potentials of the CryoSat-2 SAR and SARIn Modes for Lake Level Estimation Open
Over the last few decades, satellite altimetry has proven to be valuable for monitoring lake levels. With the new generation of altimetry missions, CryoSat-2 and Sentinel-3, which operate in Synthetic Aperture Radar (SAR) and SAR Interfero…
View article: Improved oceanographic measurements fom SAR altimetry: Results and scientific roadmap from ESA cryosat plus for oceans project
Improved oceanographic measurements fom SAR altimetry: Results and scientific roadmap from ESA cryosat plus for oceans project Open
The ESA CryoSat mission is the first space mission tocarry a radar altimeter that can operate in SyntheticAperture Radar (SAR) mode. Although the primeobjective of the CryoSat mission is dedicated tomonitoring land and marine ice, the SAR …
View article: Improved Oceanographic Measurements with Cryosat SAR Altimetry: Application to the Coastal Zone and Arctic
Improved Oceanographic Measurements with Cryosat SAR Altimetry: Application to the Coastal Zone and Arctic Open
The ESA CryoSat-2 mission is the first space mission to carry a radar altimeter that can operate in Synthetic Aperture Radar (SAR) mode. Although the prime objective of the CryoSat-2 mission is dedicated to monitoring land and marine ice, …
View article: The DTU15 MSS (Mean Sea Surface) and DTU15LAT (Lowest Astronomical Tide) reference surface
The DTU15 MSS (Mean Sea Surface) and DTU15LAT (Lowest Astronomical Tide) reference surface Open
The DTU15MSS is the latest release of the global high resolution mean sea surface from DTU Space. The major new advance leading up to the release of this DTU15MSS the use of an improved 4 years Cryosat-2 LRM, SAR and SAR-In data record and…
View article: Combining SAMOSA-3 and empirical retrackers for inland water height determination
Combining SAMOSA-3 and empirical retrackers for inland water height determination Open
Here we present a new system for retracking of SAR waveforms over rivers and lakes. Satellite altimetry offers frequent and global sampling across borders, which can be used to validate and calibrate hydrological models in remote areas whe…
View article: The Multiple Waveform Persistent Peak (MWaPP) Retracker for SAR waveforms
The Multiple Waveform Persistent Peak (MWaPP) Retracker for SAR waveforms Open
Here we present a new method for retracking of SAR waveforms over rivers and lakes. Satellite altimetry offers frequent and global sampling across borders, which can be used to validate and calibrate hydrological models in remote areas whe…
View article: LOTUS— Preparing Sentinel-3 SAR Altimetry Processing for Ocean and Land
LOTUS— Preparing Sentinel-3 SAR Altimetry Processing for Ocean and Land Open
The Sentinel-3 satellite mission with its SRAL instrumentation contains new features compared to the conventional radar altimeter mission that form the basis for new innovative scientific analyses of both ocean and inland water levels. To …
View article: Validation of cryoSat-2 based lake levels
Validation of cryoSat-2 based lake levels Open
In this study, which is part of the FP7 project Land and Ocean take up from Sentinel-3 (LOTUS), we demonstrate the potential SAR altimetry. We consider lakes at various sizes and evaluate the CryoSat-2 derived lake levels in terms of along…