Academic interests
- Glaciology
- Glacier fluctuations and climate
- Sea-level change, and the contribution of glaciers
Tags:
Glaciology
Publications
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Alonso-Gonzalez, Esteban; Aalstad, Kristoffer; Pirk, Norbert; Mazzolini, Marco; Treichler, Désirée & Leclercq, Paul
[Show all 9 contributors for this article]
(2023).
Spatio-temporal information propagation using sparse observations in hyper-resolution ensemble-based snow data assimilation.
Hydrology and Earth System Sciences (HESS).
ISSN 1027-5606.
27(24),
p. 4637–4659.
doi:
10.5194/hess-27-4637-2023.
Full text in Research Archive
Show summary
Data assimilation techniques that integrate available observations with snow models have been proposed as a viable option to simultaneously help constrain model uncertainty and add value to observations by improving estimates of the snowpack state. However, the propagation of information from spatially sparse observations in high-resolution simulations remains an under-explored topic. To remedy this, the development of data assimilation techniques that can spread information in space is a crucial step. Herein, we examine the potential of spatio-temporal data assimilation for integrating sparse snow depth observations with hyper-resolution (5 m) snow simulations in the Izas central Pyrenean experimental catchment (Spain). Our experiments were developed using the Multiple Snow Data Assimilation System (MuSA) with new improvements to tackle the spatio-temporal data assimilation. Therein, we used a deterministic ensemble smoother with multiple data assimilation (DES-MDA) with domain localization.
Three different experiments were performed to showcase the capabilities of spatio-temporal information transfer in hyper-resolution snow simulations. Experiment I employed the conventional geographical Euclidean distance to map the similarity between cells. Experiment II utilized the Mahalanobis distance in a multi-dimensional topographic space using terrain parameters extracted from a digital elevation model. Experiment III utilized a more direct mapping of snowpack similarity from a single complete snow depth map together with the easting and northing coordinates. Although all experiments showed a noticeable improvement in the snow patterns in the catchment compared with the deterministic open loop in terms of correlation (r=0.13) and root mean square error (RMSE = 1.11 m), the use of topographical dimensions (Experiment II, r=0.63 and RMSE = 0.89 m) and observations (Experiments III, r=0.92 and RMSE = 0.44 m) largely outperform the simulated patterns in Experiment I (r=0.38 and RMSE = 1.16 m). At the same time, Experiments II and III are considerably more challenging to set up. The results of these experiments can help pave the way for the creation of snow reanalysis and forecasting tools that can seamlessly integrate sparse information from national monitoring networks and high-resolution satellite information.
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Leclercq, Paul; Kääb, Andreas & Altena, Bas
(2021).
Brief communication: Detection of glacier surge activity using cloud computing of Sentinel-1 radar data.
The Cryosphere.
ISSN 1994-0416.
15(10),
p. 4901–4907.
doi:
10.5194/tc-15-4901-2021.
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Engelhardt, Markus; Leclercq, Paul Willem; Eidhammer, Trude; Kumar, Pankaj; Landgren, Oskar Andreas & Rasmussen, Roy
(2017).
Meltwater runoff in a changing climate (1951-2099) at Chhota Shigri Glacier, Western Himalaya, Northern India.
Annals of Glaciology.
ISSN 0260-3055.
58(75),
p. 47–58.
doi:
10.1017/aog.2017.13.
Full text in Research Archive
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Marzeion, Ben; Champollion, Nicholas; Haeberli, Wilfried; Langley, Kirsty A; Leclercq, Paul Willem & Paul, Frank W.
(2017).
Observation-based estimates of global glacier mass change and its contribution to sea-level change.
Surveys in geophysics.
ISSN 0169-3298.
38(1),
p. 105–130.
doi:
10.1007/s10712-016-9394-y.
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Leclercq, Paul Willem; Oerlemans, J.; Basagic, H. J.; Bushueva, I.; Cook, A. J. & Le Bris, R.
(2014).
A data set of worldwide glacier length fluctuations.
The Cryosphere.
ISSN 1994-0416.
8(2),
p. 659–672.
doi:
10.5194/tc-8-659-2014.
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Leclercq, Paul Willem
(2017).
Use of numerical modelling for Surface Mass Balance Analysis.
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Leclercq, Paul Willem; Aalstad, Kristoffer; Altena, Bas & Elvehøy, Hallgeir
(2017).
Modelling of glacier surface mass balance
with assimilation of glacier mass balance
and snow cover observations from remote
sensing.
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Altena, Bas; Leclercq, Paul Willem & Kääb, Andreas
(2016).
Automatic monitoring of the transient snowline on mountain glaciers.
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Leclercq, Paul Willem; Aalstad, Kristoffer; Elvehøy, Hallgeir & Altena, Bas
(2016).
Assimilation of glacier mass balance and snow cover fraction observations in a glacier surface mass balance model.
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Leclercq, Paul Willem; Aalstad, Kristoffer; Elvehøy, Hallgeir & Altena, Bas
(2016).
Assimilation of glacier mass balance and snow cover fraction observations in a glacier surface mass balance model.
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Marzeion, Ben; Leclercq, Paul Willem; Cogley, J. Graham & Jarosch, Alexander H.
(2015).
Brief Communication: Global reconstructions of glacier mass change during the 20th century are consistent.
The Cryosphere.
ISSN 1994-0416.
9(6),
p. 2399–2404.
doi:
10.5194/tc-9-2399-2015.
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Altena, Bas; Kääb, Andreas; Leclercq, Paul Willem & Nuth, Christopher
(2018).
Observing change in glacier flow by using optical satellites.
Universitetet i Oslo.
ISSN 1501-7710.
Show summary
In the last couple of years many Earth observation satellites with optical instruments have been set in space. These satellites generate an enormous amount of data and give us a image of different landforms on Earth. The data are available for researchers in Earth Science, though efficiently transforming this imagery data to glaciological information has been a challenge. The work in this dissertation presents modern day techniques to extract glacier velocity information from the satellite imagery. Now it is possible to extract reliable displacement measurements from any satellite independent of its flight path. In this way extracting reliable decadal changes of glacier velocity is finally possible. Moreover, by recent development in technology and clever algorithms developed in this PhD work, extracting short term velocity changes are one of the possibilities. So the timing of sliding of a glacier due to melt water can be observed and located. Lastly, methods for data reduction of big data volumes are exploited to develop a discovery tool that is able to observe glacier dynamics over several large mountain ranges. This research might be the first step towards transforming large data volumes into useful information for worldwide glacier monitoring.
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Published
Sep. 5, 2014 12:17 PM
- Last modified
Feb. 17, 2015 9:26 PM