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Record #96594:
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MARC recordThe dynamics of Austfonna, Nordaustlandet, Svalbard: surface velocities, mass balance, and subglacial melt water / J.A. Dowdeswell, David J. Drewry.
| Title: | The dynamics of Austfonna, Nordaustlandet, Svalbard: surface velocities, mass balance, and subglacial melt water / J.A. Dowdeswell, David J. Drewry. |
| Author(s): | Dowdeswell, J. A. Drewry, David J. |
| Date: | 1989. |
| In: | Annals of Glaciology. (1989.), Vol. 12 (1989) |
| Abstract: | Reports and discusses field measurements of several boundary conditions required in modelling studies of Austfonna. Field observations of ice surface and bedrock topography were made in 670 km³ drainage basin (basin 5). Third of basin lies below sea level. Bed elevations range from -100 m to >300 m, and maximum ice thickness is >500 m. Measurements from trilateral network of stakes extending over 21 km showed that maximum ice-surface velocity is 47 m a⁻¹ and maximum strain-rate is 0.64x10⁻² a⁻¹. Snow-line migration with time is mapped from digital Landsat MSS data, and mass-balance estimates are used to calculate balance velocities. At equilibrium line, 300 to 350 m in elevation, balance velocity and observed ice-surface velocity are comparable, indicating that basin is approximately in balance. Rate of iceberg calving from tide-water basin margins is considered. Enhanced Landsat imagery also shows that some of ice-cap margin is at melting point. Margins of basin 5, grounded below present sea level, are likely to be underlain by deformable sediments, but nature of substrate is unknowm inland. |
| Notes: | Annals of Glaciology. Vol. 12 :37-45 (1989). |
| Keywords: | 551.324.43 -- Land ice, regime and mass balance: Austfonna. 551.32 -- Glaciology. 551.324 -- Land ice. 551.324.24 -- Ice sheets and caps: Austfonna. 551.324.5 -- Land ice, flow: Austfonna. .000(410) -- British author: SPRI. E5 -- Glaciology: land ice. (*32) -- Svalbard. (*323) -- Nordaustlandet. |
| SPRI record no.: | 96594 |
LDR 02198naa#a2200000#a#4500 001 SPRI-96594 005 20230322033753.0 007 ta 008 230322s1989####xx#ab#|##|###|0||#0|eng#d 035 ## ‡aSPRI-96594 040 ## ‡aUkCU-P‡beng‡eaacr 100 1# ‡aDowdeswell, J. A. 245 14 ‡aThe dynamics of Austfonna, Nordaustlandet, Svalbard :‡bsurface velocities, mass balance, and subglacial melt water /‡cJ.A. Dowdeswell, David J. Drewry. 260 ## ‡a[S.l.] :‡b[s.n.],‡c1989. 300 ## ‡ap. 37-45 :‡bill., diags., tables, maps. 500 ## ‡aAnnals of Glaciology. Vol. 12 :37-45 (1989). 520 3# ‡aReports and discusses field measurements of several boundary conditions required in modelling studies of Austfonna. Field observations of ice surface and bedrock topography were made in 670 km³ drainage basin (basin 5). Third of basin lies below sea level. Bed elevations range from -100 m to >300 m, and maximum ice thickness is >500 m. Measurements from trilateral network of stakes extending over 21 km showed that maximum ice-surface velocity is 47 m a⁻¹ and maximum strain-rate is 0.64x10⁻² a⁻¹. Snow-line migration with time is mapped from digital Landsat MSS data, and mass-balance estimates are used to calculate balance velocities. At equilibrium line, 300 to 350 m in elevation, balance velocity and observed ice-surface velocity are comparable, indicating that basin is approximately in balance. Rate of iceberg calving from tide-water basin margins is considered. Enhanced Landsat imagery also shows that some of ice-cap margin is at melting point. Margins of basin 5, grounded below present sea level, are likely to be underlain by deformable sediments, but nature of substrate is unknowm inland. 650 07 ‡a551.324.43 -- Land ice, regime and mass balance: Austfonna.‡2udc 650 07 ‡a551.32 -- Glaciology.‡2udc 650 07 ‡a551.324 -- Land ice.‡2udc 650 07 ‡a551.324.24 -- Ice sheets and caps: Austfonna.‡2udc 650 07 ‡a551.324.5 -- Land ice, flow: Austfonna.‡2udc 650 07 ‡a.000(410) -- British author: SPRI.‡2udc 650 07 ‡aE5 -- Glaciology: land ice.‡2local 651 #7 ‡a(*32) -- Svalbard.‡2udc 651 #7 ‡a(*323) -- Nordaustlandet.‡2udc 700 1# ‡aDrewry, David J. 773 0# ‡7nnas ‡tAnnals of Glaciology. ‡gVol. 12 (1989) ‡wSPRI-60773 917 ## ‡aUnenhanced record from Muscat, imported 2019 948 3# ‡a20230322