ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Monograph available for loan

Mass balance of the cryosphere : observations and modelling of contemporary and future changes (2004)

Bamber, Jonathan L ; Payne, Antony J

Cambridge : Cambridge Univ. Press

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Call number: M 04.0260

Description / Table of Contents: 1. Introduction and background Jonathan Bamber and Antony PaynePart I. Observational Techniques and Methods: 2. In situ measurement techniques: land ice Jon Ove Hagen and Niels Reeh3. In situ measurement techniques: sea ice Peter Wadhams4. Remote sensing measurement techniques Jonathan Bamber and Ron KwokPart II. Modelling Techniques and Methods: 5. Modelling land ice surface mass balance Wouter Greuell and Christophe Genthon6. Modelling land ice dynamics Kees van der Veen and Anthony Payne7. Modelling sea ice dynamics William D. Hibler, IIIPart III. The Mass Balance of Sea Ice: 8. Sea ice observations Seymour Laxon, Ola Johannessen, Martin Miles, Peter Wadhams and John E. Walsh9. Sea-ice modelling Gregory M. FlatoPart IV. The Mass Balance of the Ice Sheets: 10. Greenland: recent mass-balance observations Robert H. Thomas and the PARCA investigators11. Greenland: modelling Roderik van der Wal12. Mass balance of the Antarctic ice sheet: observational aspects Charles Bentley13. Antarctica: modelling Philippe HuybrechtsPart V. The Mass Balance of Ice Caps and Glaciers: 14. Arctic ice caps and glaciers Julian Dowdeswell15. Glaciers and ice caps: historical background and strategies of worldwide monitoring Wilfried Haeberli16. Glaciers and the study of climate and sea-level change Mark Dyurgerov and Mark Meier17. Conclusions, summary and outlook Jonathan Bamber and Antony Payne.

Type of Medium: Monograph available for loan

Pages: XVII, 644 S. , Ill. [z.T. farb.], graph. Darst

ISBN: 0521808952

Location: Upper compact magazine

Branch Library: GFZ Library

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2

Electronic Resource

On the glaciology of Edgeøya and Barentsøya, Svalbard (1995)

DOWDESWELL, JULIAN A. ; BAMBER, JONATHAN L.

Oxford, UK : Blackwell Publishing Ltd

Polar research 14 (1995), S. 0

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ISSN: 1751-8369

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geography , Geosciences

Notes: The ice masses on Edgeøya and Barentsøya are the least well known in Svalbard. The islands are 42-47% ice covered with the largest ice cap, Edgeøyjøkulen, 1365 km2 in area. The tidewater ice cliffs of eastern Edgeøya are over 80 km long and produce small tabular icebergs. Several of the ice-cap outlet glaciers on Edgeøya and Barentsøya are known to surge, and different drainage basins within the ice caps behave as dynamically separate units. Terminus advances during surging have punctuated more general retreat from Little Ice Age moraines, probably linked to Twentieth Ceutury climate warming and mass balance change. Airborne radio-echo sounding at 60 MHz along 340 km of flight track over the ice masses of Edgeøya and Barentsøya has provided ice thickness and elevation data. Ice is grounded below sea level to about 20 km inland from the tidewater terminus of Stonebreen. Ice thickens from 〈100 m close to the margins, to about 250 m in the interior of Edgeøyjøkulen. The maximum ice thickness measured on Barentsjøkulen was 270 m. Landsat MSS images of the two islands, calibrated to in-band reflectance values, allow synoptic examination of snowline position in late July/early August. Snow and bare glacier ice were identified, and images were digitally stretched and enhanced. The snowline was at about 300 m on the east side of Edgeøyjøkulen, and 50-100 m higher to the west. Snowlines were at approximately 450 m on Digerfonna and Storskalven. On Barentsjøkulen the snowline was 350 m above sea level on the eastern flank and over 400 m on the west. This asymmetry suggests greater precipitation on the east side of the ice caps. Enhanced Landsat imagery was also used to identify suspended sediments in the waters offshore of the islands. Where this turbid meltwater emerges from tidewater glacier termini, it is likely to be derived from the subglacial drainage system. This suggests that at least parts of the beds of the ice masses on Edgeøya and Barentsøya are at the pressure melting point, and that a basal hydrological system is present.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1751-8369.1995.tb00684.x

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Paper (German National Licenses)

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Synthesized grounding line and ice shelf mask for Antarctica (2013)

Depoorter, Mathieu A ; Bamber, Jonathan L ; Griggs, Jennifer ; [et al.]

PANGAEA

In: Supplement to: Depoorter, Mathieu A; Bamber, Jonathan L; Griggs, Jennifer; Lenaerts, Jan T M; Ligtenberg, Stefan R M; van den Broeke, Michiel R; Moholdt, Geir (2013): Calving fluxes and basal melt rates of Antarctic ice shelves. Nature, 502, 89-92, https://doi.org/10.1038/nature12567

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Publication Date: 2023-01-13

Description: Iceberg calving has been assumed to be the dominant cause of mass loss for the Antarctic ice sheet, with previous estimates of the calving flux exceeding 2,000 gigatonnes per year. More recently, the importance of melting by the ocean has been demonstrated close to the grounding line and near the calving front. So far, however, no study has reliably quantified the calving flux and the basal mass balance (the balance between accretion and ablation at the ice-sheet base) for the whole of Antarctica. The distribution of fresh water in the Southern Ocean and its partitioning between the liquid and solid phases is therefore poorly constrained. Here we estimate the mass balance components for all ice shelves in Antarctica, using satellite measurements of calving flux and grounding-line flux, modelled ice-shelf snow accumulation rates and a regional scaling that accounts for unsurveyed areas. We obtain a total calving flux of 1,321 ± 144 gigatonnes per year and a total basal mass balance of -1,454 ± 174 gigatonnes per year. This means that about half of the ice-sheet surface mass gain is lost through oceanic erosion before reaching the ice front, and the calving flux is about 34 per cent less than previous estimates derived from iceberg tracking. In addition, the fraction of mass loss due to basal processes varies from about 10 to 90 per cent between ice shelves. We find a significant positive correlation between basal mass loss and surface elevation change for ice shelves experiencing surface lowering and enhanced discharge. We suggest that basal mass loss is a valuable metric for predicting future ice-shelf vulnerability to oceanic forcing.

Type: Dataset

Format: application/zip, 3 datasets

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Greenland basal water distribution from airborne radar sounding (2003-2014) (2018)

Jordan, Thomas M ; Williams, Christopher N ; Schroeder, Dustin M ; [et al.]

PANGAEA

In: Supplement to: Jordan, Thomas M; Williams, Christopher N; Schroeder, Dustin M; Martos, Yasmina M; Cooper, Michael A; Siegert, Martin J; Paden, John D; Huybrechts, Philippe; Bamber, Jonathan L (2018): A constraint upon the basal water distribution and thermal state of the Greenland Ice Sheet from radar bed echoes. The Cryosphere, 12(9), 2831-2854, https://doi.org/10.5194/tc-12-2831-2018

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Publication Date: 2023-01-13

Description: There is widespread, but often indirect, evidence that a significant fraction of the bed beneath the Greenland Ice Sheet is thawed (at or above the pressure melting point for ice). This includes the beds of major outlet glaciers and their tributaries and a large area around the NorthGRIP borehole in the ice-sheet interior. The ice-sheet scale distribution of basal water is, however, poorly constrained by existing observations. In principle, airborne radio-echo sounding (RES) enables the detection of basal water from bed-echo reflectivity, but unambiguous mapping is limited by uncertainty in signal attenuation within the ice. Here we introduce a new, RES diagnostic for basal water that is associated with wet-dry transitions in bed material: bed-echo reflectivity variability. This technique acts as a form of edge detector and is a sufficient, but not necessary, criteria for basal water. However, the technique has the advantage of being attenuation-insensitive and suited to data combination enabling combined analysis of over a decade of Operation IceBridge survey data. The basal water predictions are compared with existing analyses of the basal thermal state (frozen and thawed beds) and geothermal heat flux. In addition to the outlet glaciers, we demonstrate widespread water storage in the northern and eastern interior. Notably, we observe a quasi-linear 'corridor' of basal water extending from NorthGRIP to Petermann glacier that spatially correlates with elevated heat flux predicted by a recent magnetic model. Finally, with a general aim to stimulate regional- and process-specific investigations, the basal water predictions are compared with bed topography, subglacial flow paths, and ice-sheet motion. The basal water distribution, and its relationship with the thermal state, provides a new constraint for numerical models.

Keywords: DATE/TIME; File content; File format; File name; File size; Greenland; Uniform resource locator/link to file

Type: Dataset

Format: text/tab-separated-values, 70 data points

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A new synthesis of annual land ice mass trends 1992 to 2016 (2018)

Bamber, Jonathan L ; Westaway, Richard M ; Marzeion, Ben ; [et al.]

PANGAEA

In: Supplement to: Bamber, Jonathan L; Westaway, Richard M; Marzeion, Ben; Wouters, Bert (2018): The land ice contribution to sea level during the satellite era. Environmental Research Letters, 13(6), 063008, https://doi.org/10.1088/1748-9326/aac2f0

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Publication Date: 2023-01-13

Description: We have assessed and synthesised land ice mass trend results published, primarily, since the IPCC AR5 (2013) to produce a consistent estimate of land ice mass trends during the satellite era (1992 to 2016). Our resulting synthesis is both consistent and rigorous, drawing on i) the published literature, ii) expert assessment of that literature, and iii) a new analysis of Arctic glacier and ice cap trends combined with statistical modelling. In the associated paper (Bamber et al 2018) we present annual and pentad (five-year mean) time series for the East, West Antarctic and Greenland Ice Sheets and glaciers separately and combined. When averaged over pentads, covering the entire period considered, we obtain a monotonic trend in mass contribution to the oceans, increasing from 0.31±0.35 mm of sea level equivalent for 1992-1996 to 1.85±0.13 for 2012-2016. Our integrated land ice trend is lower than many estimates of GRACE-derived ocean mass change for the same periods. This is due, in part, to a smaller estimate for glacier and ice cap mass trends compared to previous assessments. We discuss this, and other likely reasons, for the difference between GRACE ocean mass and land ice trends.

Keywords: DATE/TIME; Mass balance; Standard deviation

Type: Dataset

Format: text/tab-separated-values, 250 data points

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