Per Knudsen
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View article: The DTU25 Mean Sea Surface: From and For SWOT
The DTU25 Mean Sea Surface: From and For SWOT Open
We introduce a new Mean Sea Surface model (MSS) that incorporates the wide-swath altimetry obtained from the Surface Water and Ocean Topography (SWOT) satellite, along with long timeseries of conventional altimetry. The DTU25MSS constrains…
View article:  The next step in marine reference surfaces – the DTU25 mean sea surface
 The next step in marine reference surfaces – the DTU25 mean sea surface Open
During the last 30 years, following the breakthrough that was the TOPEX/Poseidon satellite altimeter, improvements of satellite altimetry has been incremental. We have several generations of satellites to build upon, and with the inclusion…
View article: Evaluating static gravity field models using GUT
Evaluating static gravity field models using GUT Open
The GOCE User Toolbox GUT was originally developed for the utilisation and analysis of GOCE products to support applications in Geodesy, Oceanography and Solid Earth Physics. GUT consists of a series of advanced computer routines that carr…
View article: Assessment of the Performance of SWOT for Observing the Static Ocean Topography
Assessment of the Performance of SWOT for Observing the Static Ocean Topography Open
Marine geodetic references, such as the mean sea surface (MSS), are currently limited by the spatial resolution of conventional satellite altimeters. We analyze the new swath‐altimetry data from the Surface Water and Ocean Topography (SWOT…
View article: GOCE User Toolbox and Tutorial
GOCE User Toolbox and Tutorial Open
The GOCE User Toolbox GUT is a compilation of tools for the utilisation and analysis of GOCE Level 2 products. GUT support applications in Geodesy, Oceanography and Solid Earth Physics. The GUT Tutorial provides information and guidance in…
View article: Toolbox for NGGM/MAGIC
Toolbox for NGGM/MAGIC Open
The NGGM/MAGIC missions are envisaged to advance the applications of satellite based gravity field information for tracking changes in the mass distribution and transport in ground water storages, ice sheets and oceans. The GOCE User Toolb…
View article: Ocean mass changes from the lower degree harmonics
Ocean mass changes from the lower degree harmonics Open
The study is based on the low degree harmonics to focus on the accurate long wavelength parts of the GRACE/GFO gravity fields. To reduce the contamination of mass changes on land a set of point masses are estimated and analyzed to verify e…
View article: Large-scale rain gauge network optimization using a kriging emulator
Large-scale rain gauge network optimization using a kriging emulator Open
Rain gauge networks deliver crucial observations for many water-related applications but can be expensive to purchase and operate, which makes optimization of the number and locations of gauges an important task. Traditional optimization a…
View article: Causes of Global Elastic Vertical Land Movement from 1900 to 2022
Causes of Global Elastic Vertical Land Movement from 1900 to 2022 Open
Elastic vertical land movement (eVLM) is the lithosphere's immediate elastic response to the loading and unloading of the Earth's surface mass. Understanding eVLM is crucial for interpreting relative sea level changes, particularly in coas…
View article: Spectrally Consistent Mean Dynamic Topography by Combining Mean Sea Surface and Global Geopotential Model Through a Least Squares-Based Approach
Spectrally Consistent Mean Dynamic Topography by Combining Mean Sea Surface and Global Geopotential Model Through a Least Squares-Based Approach Open
The filtering procedure is usually mandatory for modeling mean dynamic topography (MDT) when a geodetic approach based on the Mean Sea Surface (MSS) and the Global Geopotential Model (GGM) is used. This is due to the inconsistent spectral …
View article: Global sea-level budget and ocean-mass budget, with a focus on advanced data products and uncertainty characterisation
Global sea-level budget and ocean-mass budget, with a focus on advanced data products and uncertainty characterisation Open
Studies of the global sea-level budget (SLB) and the global ocean-mass budget (OMB) are essential to assess the reliability of our knowledge of sea-level change and its contributors. Here we present datasets for times series of the SLB and…
View article: Comment on essd-2021-137
Comment on essd-2021-137 Open
Abstract. Studies of the global sea-level budget (SLB) and the global ocean-mass budget (OMB) are essential to assess the reliability of our knowledge of sea-level change and its contributors. Here we present datasets for times series of t…
View article: Comment on essd-2021-137
Comment on essd-2021-137 Open
Abstract. Studies of the global sea-level budget (SLB) and the global ocean-mass budget (OMB) are essential to assess the reliability of our knowledge of sea-level change and its contributors. Here we present datasets for times series of t…
View article: Global sea-level budget and ocean-mass budget, with focus on advanced data products and uncertainty characterisation
Global sea-level budget and ocean-mass budget, with focus on advanced data products and uncertainty characterisation Open
Studies of the global sea-level budget (SLB) and the global ocean-mass budget (OMB) are essential to assess the reliability of our knowledge of sea-level change and its contributions. Here we present datasets for times series of the SLB an…
View article: TEC and Scintillations in the Ionosphere above Greenland
TEC and Scintillations in the Ionosphere above Greenland Open
<p>Global Navigation Satellite System (GNSS) signals are affected by the media of the ionosphere when traversing it. Therefore, near real-time monitoring of the ionosphere and its scintillation can be an advantage for GNSS users. The…
View article: Coastal marine gravity modelling from satellite altimetry – case study in the Mediterranean
Coastal marine gravity modelling from satellite altimetry – case study in the Mediterranean Open
The coastal marine gravity field is not well modelled due to poor data coverage. Recent satellite altimeters provide reliable altimetry observations near the coast, filling the gaps between the open ocean and land. We show the potential of…
View article: Arctic Sea Level Budget Assessment during the GRACE/Argo Time Period
Arctic Sea Level Budget Assessment during the GRACE/Argo Time Period Open
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 technique…
View article: Global Sea Level Budget and Ocean Mass Budget, with Focus on New Data Products and Uncertainty Characterization.
Global Sea Level Budget and Ocean Mass Budget, with Focus on New Data Products and Uncertainty Characterization. Open
Studies of the sea-level budget are a means of assessing our ability to quantify and understand sea-level changes and their causes. Closure of the total sea level budget implies that the observed changes of global mean sea level (from sate…
View article: Sea Level Trends and Variability of the Baltic Sea From 2D Statistical Reconstruction and Altimetry
Sea Level Trends and Variability of the Baltic Sea From 2D Statistical Reconstruction and Altimetry Open
2D sea level trend and variability fields of the Baltic Sea were reconstructed based on statistical modeling of monthly tide gauge observations, and model reanalysis as a reference. The reconstruction included both absolute and relative se…
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
© The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in [citation], doi:[doi].
\nGommenginger, C., Chapron, B., Hogg, A., Buckingham, C., Fox-K…
View article: Accelerating changes in ice mass within Greenland, and the ice sheet’s sensitivity to atmospheric forcing
Accelerating changes in ice mass within Greenland, and the ice sheet’s sensitivity to atmospheric forcing Open
Significance The recent deglaciation of Greenland is a response to both oceanic and atmospheric forcings. From 2000 to 2010, ice loss was concentrated in the southeast and northwest margins of the ice sheet, in large part due to the increa…
View article: Calibration of Extrinsic Transformation Using Manifold Optimization
Calibration of Extrinsic Transformation Using Manifold Optimization Open
Data fusion with multiple heterogeneous sensors has shown great importance for motion control and navigation filter design of autonomous vehicles. However, data fusion often requires prior knowledge of the extrinsic transformations between…
View article: Towards a dynamic reference frame in Iceland
Towards a dynamic reference frame in Iceland Open
There is a growing need for geodetic reference frames that on a national level support the increas-ing use of global positioning services. Today, the vast majority of countries have their own national ref-erence frame. In Europe this frame…
View article: Improving the Coastal Mean Dynamic Topography by Geodetic Combination of Tide Gauge and Satellite Altimetry
Improving the Coastal Mean Dynamic Topography by Geodetic Combination of Tide Gauge and Satellite Altimetry Open
International audience
View article: Deliverable 2.7 Report on present observing capacities and gaps: Land and cryosphere
Deliverable 2.7 Report on present observing capacities and gaps: Land and cryosphere Open
This document describes the critical knowledge gaps and suggests future research directions. This document is intended to: −define the current gaps in knowledge in critical field investigating the impact of climate change on terrestrial an…
View article: The Geomed2 Combined Geoid Model
The Geomed2 Combined Geoid Model Open
The GEOMED 2 project computed a high-accuracy and resolution marine geoid model based on the availability of improved models for gravity, thanks to GRACE and GOCE in particular, for land topography and bathymetry, and the compilation of a …
View article: Final Results from GOCE++ Dynamical Coastal Topography and Tide Gauge Unification Using Altimetry and GOCE.
Final Results from GOCE++ Dynamical Coastal Topography and Tide Gauge Unification Using Altimetry and GOCE. Open
The major results from the ESA – GOCE ++ project on the potential of ocean levelling as a novel approach to the study of height system unification taking the recent development in geoid accuracy trough GOCE data into account. The suggested…
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 …