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Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 * National Snow & Ice Data Center, University of Colorado, Boulder CO, 80309 Many thanks to: NSF support (OPP #9909518) Raytheon Polar Services A. Gades, M. Conway & E. Waddington Ungrounded Conditions in the Mouth of Kamb Ice Stream?

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Page 1: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Data source: I. Joughin, JPL

G. Catania, H. Conway, C. Raymond and T. Scambos*

Earth and Space Sciences, University of Washington, Seattle WA, 98195 *National Snow & Ice Data Center, University of Colorado, Boulder CO, 80309

Many thanks to:

NSF support (OPP #9909518)

Raytheon Polar Services

A. Gades, M. Conway &

E. Waddington

Ungrounded Conditions in the Mouth of Kamb Ice Stream?

Page 2: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Identification of boundaries and terrains

SipleDome

EngelhardtRidge

Kamb Ice Stream

WhillansStreamIce

Page 3: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

SipleDome

EngelhardtRidge

Kamb Ice Stream

WhillansStreamIce

Identification of boundaries and terrains

Page 4: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

SipleDome

EngelhardtRidge

Identification of boundaries and terrains

Kamb Ice Stream

WhillansStreamIce

Page 5: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

SipleDome

EngelhardtRidge

Identification of boundaries and terrains

Kamb Ice Stream

WhillansStreamIce

Page 6: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

SipleDome

EngelhardtRidge

Identification of boundaries and terrains

Kamb Ice Stream

WhillansStreamIce

Page 7: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

SipleDome

EngelhardtRidge

Identification of boundaries and terrains

Kamb Ice Stream

WhillansStreamIce

Page 8: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

SipleDome

EngelhardtRidge

Identification of boundaries and terrains

Kamb Ice Stream

WhillansStreamIce

Page 9: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Terrain on both sides of KIS Diffractors have uniform depth Diffractors are line-type No near-surface diffractors

Flat-ice terrain

Identification of other features

Syncline feature

Ice StreamTerrain

Page 10: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Syncline feature

Syncline amplitude grows with depth. Deep layers are truncated by the bed. Synclines are narrow in width. No change in layer thickness across

dip.

Identification of other features

Flat-iceTerrainIce Stream

Terrain

Page 11: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Localized Basal Melt

Causes of layer downwarping

Page 12: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Localized Basal Melt

Causes of layer downwarping

How long did it melt for?

Page 13: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Localized Basal Melt

Causes of layer downwarping

How long did it melt for?

Melting lasted for ~10-130 years

Page 14: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Localized Basal Melt

Causes of layer downwarping

Melting lasted for ~10-130 years

Short-lived meltingSpatially focussed melting

Deep diffractorsSyncline features wrap around ridges

How long did it melt for?

Page 15: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Ice Stream Margin?

Pros: melting is spatially focussed melting is short-lived

Cons: no explanation of deep line-diffractors synclines wrap around ridges

Localized Basal Melting

Page 16: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Ice Stream Margin?

Pros: melting is spatially focussed melting is short-lived

Cons: no explanation of deep line-diffractors synclines wrap around ridges

Geothermal Source?

Pros: synclines wrap around ridges

Cons: no explanation of deep line-diffractors source must be extremely shallow melting is short-lived

Localized Basal Melting

Page 17: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Ice Stream Margin?

Pros: melting is spatially focussed melting is short-lived

Cons: no explanation of deep line-diffractors synclines wrap around ridges

Geothermal Source?

Pros: synclines wrap around ridges

Cons: no explanation of deep line-diffractors source must be extremely shallow melting is short-lived

Grounding Line Melt?

Pros: explains deep line-diffractors melting is short-lived synclines wrap around ridges

Cons: not currently floating melting is spatially focussed

Localized Basal Melting

Page 18: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

When did it float?

Relict Grounding Line Positions

BEDMAP

SipleDome

EngelhardtRidge

Kamb Ice Stream

Whillans StreamIce not floating now (50-100 m above)

sea level is steady so floatation due to thickness changes

thickness changes indicate it could have grounded ~350 years ago

AccumulationCompression

became floating ~480 years ago

Page 19: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Flow history of Kamb Ice Stream

~700 y.b.p

SipleDome

EngelhardtRidge

CIR

Wide trunk, fast flowpermits thinning

Page 20: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Flow history of Kamb Ice Stream

~500 y.b.p

SipleDome

EngelhardtRidge

CIR

Thinning floatationShift in flow direction of WIS

Page 21: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Flow history of Kamb Ice Stream

~450 y.b.p

SipleDome

EngelhardtRidge

CIR

Ice/water piracy shutdown of SIS

Page 22: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Flow history of Kamb Ice Stream

~350 y.b.p

SipleDome

EngelhardtRidge

CIR

SIR

Re-advance (b/c of WIS?)Narrowing of KISDestruction of water system?

Page 23: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Flow history of Kamb Ice Stream

~250 y.b.p

SipleDome

EngelhardtRidge

CIR

SIR

Ice/water piracy shutdown of KIS0

Page 24: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Flow history of Kamb Ice Stream

~150 y.b.p

SipleDome

EngelhardtRidge

CIR

SIR

Stagnation of KISContinued flow in tributaries

Page 25: Data source: I. Joughin, JPL G. Catania, H. Conway, C. Raymond and T. Scambos * Earth and Space Sciences, University of Washington, Seattle WA, 98195 *

Syncline features/flat-ice terrain identified: Strongly downwarped isochrones bound flat-ice terrains Likely caused by basal melting for 130 years Melting is a result of grounding line melt? Associated deep diffractors caused by past floatation events Floating occurred between 500 years ago and ended ~350 years ago

Ice flow history of KIS: Grounding line retreat in the mouth of KIS prior to stoppage Sudden floatation and regrounding could destroy the subglacial drainage network This might permit freezing to occur as upstream water is unable to reach the trunk

SUMMARY: Flow history of Kamb Ice Stream


University of Washington Seattle, WA. 98195-2255burke/PDF/Nac99-2.pdf · University of Washington Seattle, WA. 98195-2255 Resource Facility for Population Kinetics Department of Bioengineering

Better Physics in Embedded Models: Iceberg arcing and Lake-surface profiles Aitbala Sargent, James L Fastook, Ted Scambos. University of Maine We thank

grad.uw.edu · Web viewLoew 307, Box 352191 Seattle, WA 98195-3770 | tel. 206.685.3519 fax.206.543.8798 grad.washington.edu

Seattle, Washington 98195 University of Washington AN

NSIDC IceBridge Value Added Data Products Ted Scambos, Bruce Raup, Susan Rogers, Mary-Jo Brodzik

Tidal Modulation of Stick-Slip Ice Stream Motion R. A. Bindschadler M.King P. Vornberger S. Anandakrishnan I. Joughin D. Voigt R. A. Alley We acknowledge

Mark C. Serreze Julienne Stroeve, Walt Meier, Ted Scambos, Marika Holland, Stephanie Renfrow, Matt Savoie Cooperative Institute for Research in Environmental

Ryan Lawrence (ECSU), Mentors: Dr. Ian Joughin (UW ), Ms. Brooke Medley (UW)

Proposed Design Methodology for shotcrete W.C Joughin, G.C. Howell, A.R. Leach & J. Thompson

ONTOLOGICAL AND ETHICO-POLITICAL ... - …flsfdergisi.com/sayi25/163-180.pdf · 1 Gilles Deleuze, Negotiations, tr. Martin Joughin, Columbia University Press, New York: 1995, pp

Radiation shielding produced by mini-magnetospheresearthweb.ess.washington.edu/space/M2P2/rad.shielding.pdf · University of Washington Seattle, WA 98195-1310 [email protected]

Gordon Joughin, The University of Queensland, Australia

Seattle, Washington 98195 University of Washington College

MAUC Meeting July 15 2003 · MCMURDO SUMMARY REPORT – JULY 15, 2003 Page 7 OPENING Welcome and Introductions of Attendees Scambos opened the meeting with welcoming remarks. The

ERROR ASSESSMENT FOR EMERGING TRAFFIC DATA …depts.washington.edu/pactrans/wp-content/uploads/... · Seattle, WA 98195-2700 Univeristy of Washington Smart Transportation Applications

Plato versus AHELO: The nature and role of the spoken word in assessing and promoting learning. Gordon Joughin, The University of Queensland, Australia

Questions worth asking about assessment: 7 challenges to practice Associate Professor Gordon Joughin Teaching and Educational Development Institute (TEDI)

Sarah Rittling National Director Charlie Joughin Communications Director

DEALING WITH UNCERTAINTY AND RISK IN ROCK ......BERGMEKANIKDAGE 20 ARS 13 DEALING WITH UNCERTAINTY AND RISK IN ROCK ENGINEERING DESIGN William. C. Joughin, SRK Consulting Introduction

WELCOME TO Y1 Mrs Pimbley, Miss Clayton, Miss Barker, Mrs Owen, Mrs Joughin and Mrs Parry

Mündliche Prüfung - uni-mainz.de · stellen mündliche Prüfungen ebenfalls ein sinnvolles Prüfungsinstrument dar (Joughin 1998: 370). Eine mündliche Prüfung, die den Studierenden

Glaciological advances made with interferometric …...Glaciological advances made with interferometric synthetic aperture radar Ian JOUGHIN, 1 Ben E. SMITH, 1 Waleed ABDALATI 2 1

Ice-Sheet Response to Oceanic Forcing Ian Joughin et al ...users.clas.ufl.edu/prwaylen/GEO2200 Readings/Readings/Climate ch… · Science 338, 1172 (2012); Ian Joughin et al. Ice-Sheet

Cryospheric Applications of Landsat-8...Cryospheric Applications of Landsat-8 Ted Scambos Marin Klinger, Allen Pope, Mark Fahnestock, G. Garrett Campbell, Robert Bindschadler National

Doing Business with Deleuze? · Societies,” in Negotiations, trans. by M. Joughin (Columbia University Press ... doing business with Deleuze would basically lead to at least one

THE USE OF YIELD LINE ANALYSIS AND PANEL TESTS FOR THE DESIGN OF SHOTCRETE by WC JOUGHIN * and GC HOWELL ** SRK Consulting, Johannesburg * Principal Mining

Helen Amanda Fricker Scripps Institution of Oceanography Ted Scambos National Snow and Ice Data Center Bob Bindschadler NASA/GSFC Space Flight Center Laurie

Marine Taxa Track Local Climate Velocities · 15. T. Haran, J. Bohlander, T. Scambos, T. Painter, M. Fahnestock, compilers, Moderate Resolution ... not been attempted (2, 13, 18)

THE MEASUREMENT AND ANALYSIS OF by Noel C. Joughin A

Brief Communication: Further summer speedup of Jakobshavn ... · 210 I. Joughin et al.: Further summer speedup of Jakobshavn Isbræ Fig. 1. TerraSAR-X image acquired 20 September

Seattle, WA 98195 Potential Mitigation of Juvenile

Managing IceBridge Airborne Mission Data at the National Snow and Ice Data Center M. Kaminski, M. Brodzik, J. Deems, T. Scambos National Snow and Ice Data

Mutational Heterogeneity in Human Cancers: Origin and ...depts.washington.edu/loeblabs/pdf/2009_Salk.pdf · University of Washington, Seattle, Washington 98195; email: [email protected]

Next Week for Tues, please read Joughin et al 2008 and for

Basal Shear Stress of the Ross Ice Streams from Control Method Inversions Ian Joughin Jet Propulsion Lab, California Institute of Technology Slawek Tulaczyk