HIRLAM experiments on surface energy balance across Vatnajökull, Iceland

Rontu, Laura; Obleitner, Friedrich; Gollvik, Stefan; Zingerle, Christoph; Tijm, Sander

doi:10.1007/s00703-008-0339-y

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…To further quantify the amount of liquid water equivalent (weq) present, we invoke the firn (subsurface) model used in HIRHAM5 as documented by Langen et al , [HIRHAM5, ] but used in an operational setup forced with 6‐hourly surface energy fluxes and precipitation from the Danish Meteorological Institute's weather forecast model, HIRLAM 7.3 K05 [ Undén et al , ; Rontu et al , ; Kjellström et al , ]. The firn model allows the surface liquid water budget to be decomposed into components such as surface melt water runoff, retention in snow pack, refreezing, and more.…”

Section: Methods and Resultsmentioning

confidence: 99%

Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland

Rathmann¹,

Hvidberg²,

Solgaard

et al. 2017

Geophysical Research Letters

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The seasonal response to surface melting of the Northeast Greenland Ice Stream outlets, Zachariae and 79N, is investigated using new highly temporally resolved surface velocity maps for 2016 combined with numerical modeling. The seasonal speedup at 79N of 0.15 km/yr is suggested to be driven by a decrease in effective basal pressure induced by surface melting, whereas for Zachariae its 0.11 km/yr seasonal speedup correlates equally well with the breakup of its large ice mélange. We investigate the influence 76 km long floating tongue at 79N, finding it provides little resistance and that most of it could be lost without impacting the dynamics of the area. Furthermore, we show that reducing the slipperiness along the tongue‐wall interfaces produces a velocity change spatially inconsistent with the observed seasonal speedup. Finally, we find that subglacial sticky spots such as bedrock bumps play a negligible role in the large‐scale response to a seasonally enhanced basal slipperiness of the region.

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Section: Methods and Resultsmentioning

confidence: 99%

Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland

Rathmann¹,

Hvidberg²,

Solgaard

et al. 2017

Geophysical Research Letters

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“…The skill of prominent global or regional climate models to simulate the Arctic atmosphere was investigated by numerous validation and model intercomparison studies [13][14][15][16][17][18][19][20]. Major efforts were associated to carefully designed and coordinated observational and model intercomparison projects (SHEBA, Surface Heat Budget of the Arctic Ocean, Perovich et al [21]; ARCMIP, Curry and Lynch [15]).…”

Section: Introductionmentioning

confidence: 99%

Applying a Mesoscale Atmospheric Model to Svalbard Glaciers

Claremar

Obleitner

Reijmer

et al. 2012

Advances in Meteorology

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The mesoscale atmospheric model WRF is used over three Svalbard glaciers. The simulations are done with a setup of the model corresponding to the state-of-the-art model for polar conditions, Polar WRF, and it was validated using surface observations. The ERA-Interim reanalysis was used for boundary forcing and the model was used with three nested smaller domains, 24 and 8 km, and 2.7 km resolution. The model was used for a two-year period as well as for a more detailed study using 3 summer and winter months. In addition sensitivity tests using finer horizontal and vertical resolution in the boundary layer and using different physics schemes were performed. Temperature and incoming short- and long-wave radiation were skillfully simulated, with lower agreement between measured and modelled wind speed. Increased vertical resolution improved the frequency distributions of the wind speed and the temperature. The choice of different physics schemes only slightly changed the model results. The polar-optimized microphysics scheme outperformed a slightly simpler microphysics scheme, but the two alternative and more sophisticated PBL schemes improved the model score. A PBL scheme developed for very stable stratifications (QNSE) proved to be better in the winter.

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HIRLAM experiments on surface energy balance across Vatnajökull, Iceland

Cited by 2 publications

References 19 publications

Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland

Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland

Applying a Mesoscale Atmospheric Model to Svalbard Glaciers

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