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<meta content="Janssen, Volker" name="eprints.creators_name" />
<meta content="Coleman, Richard" name="eprints.creators_name" />
<meta content="Bassis, Jeremy N." name="eprints.creators_name" />
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<meta content="Ice shelves are important components of the Antarctic ice sheet due to their ice-ocean-atmosphere interface and vulnerability to global increases (or decreases) in atmospheric and oceanic temperatures. The development of rifts, which are fractures that penetrate through the entire ice shelf thickness, precede large tabular iceberg detachment and can lead to ice shelf break-up. Changes in strain rates on an active propagating rift system on the Amery Ice Shelf, East Antarctica are determined using in-situ Global Positioning System (GPS) measurements. Results for the 2002/03 Antarctic summer period (Dec-Feb) confirm previous observations by [2] that rift propagation occurs in episodic bursts separated by several days. Transverse-to-flow (i.e. parallel-to-rift) strain rates exceed longitudinal-to-flow (i.e. normal-to-rift) rates by up to a factor of 5 and maximum principal strain rates around the rift tip vary from 12 to 21 [x 10-3/yr]. A rotation in the direction of the principal strain is evident around the rift tip, indicating a change in the mechanics of rift fracture. It is demonstrated that cumulative sum analysis [12], obtained by differencing a pair of residual baseline time series situated approximately normal and parallel to the rift, is an effective method to detect small baseline length changes." name="eprints.abstract" />
<meta content="2007" name="eprints.date" />
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<meta content="1. Allison, I., 1991. The Lambert Glacier/Amery Ice Shelf Study: 1988-1991. Aurora, 10 (4): 22-25.
2. Bassis, J.N., Coleman, R., Fricker, H.A. and Minster, J.B., 2005. Episodic Propagation of a Rift on the Amery Ice Shelf, East Antarctica. Geophys. Res. Lett., 32 (2): L06502, doi:10.1029/ 2004GL022048.
3. Brunner, F.K., 1979. On the Analysis of Geodetic Networks for the Determination of the Incremental Strain Tensor. Survey Review, XXV (192): 56-67.
4. Brunner, F.K., Coleman, R. and Hirsch, B., 1981. A Comparison of Computation Methods for Crustal Strains from Geodetic Measurements. Tectonophysics, 71: 281-298.
5. Budd, W.F., Corry, M.J. and Jacka, T.H., 1982. Results from the Amery Ice Shelf Project. Ann. Glaciol., 3: 36-41.
6. Budd, W., Landon Smith, I. and Wishart, E., 1967. The Amery Ice Shelf, in Oura, H. (Ed.), 1967. The Physics of Snow and Ice, Proc. Int. Conf. on Low Temperature Science, Hokkaido University, Sapporo, Japan. Institute of Low Temperature Science, Sapporo, 447-467.
7. Coleman, R. and Lambeck, K., 1983. Crustal motion in South Eastern Australia: Is there geodetic evidence for it? Aust. J. Geod. Photo. Surv., 39: 1-26.
8. De Angelis, H. and Skvarca, P., 2003. Glacier Surge after Ice Shelf Collapse. Science, 299: 1560-1562.
9. Fricker, H.A., Bassis, J.N., Minster, B. and MacAyeal, D.R., 2005a. ICESat's New Perspective on Ice Shelf Rifts: The Vertical Dimension. Geophys. Res. Lett., 32: L23S08, doi:10.1029/ 2005GL025070.
10. Fricker, H.A., Young, N.W., Coleman, R., Bassis, J.N. and Minster, J.B., 2005b. Multi-year Monitoring of Rift Propagation on the Amery Ice Shelf, East Antarctica. Geophys. Res. Lett., 32 (2): L02502, doi:10.1029/2004GL021036.
11. Hughes, T., 1992. On the Pulling Power of Ice Streams. J. Glaciol., 38 (128): 125-151.
12. Iz, H.B., 2006. Differencing Reveals Hidden Changes in Baseline Length Time-Series. J. Geod., 80: 259-269.
13. Jacobs, S., Helmer, H., Doake, C., Jenkins, A. and Frolich, R., 1992. Melting of the Ice Shelves and the Mass Balance of Antarctica. J. Glaciol., 38 (130): 375-387.
14. Jaeger, J.C., 1969. Elasticity, Fracture and Flow. Methuen, London, 268pp.
15. Joughin, I. and MacAyeal, D.R., 2005. Calving of Large Tabular Icebergs from Ice Shelf Rift Systems. Geophys. Res. Lett., 32: L02501, doi:10.1029/2004GL020978.
16. King, M., Coleman, R. and Morgan, P., 2000. Treatment of Horizontal and Vertical Tidal Signals in GPS Data: A Case Study on a Floating Ice Shelf. Earth Planets Space, 52 (11): 1043-1047.
17. Larour, E., Rignot, E. and Aubry, D., 2004. Modelling of Rift Propagation on Ronne Ice Shelf, Antarctica, and Sensitivity to Climate Change. Geophys. Res. Lett., 31: L16404, doi:10.1029/ 2004GL020077.
18. Mercer, J.H., 1978. West Antarctic Ice Sheet and CO2 Greenhouse Effect: A Threat of Disaster. Nature, 271: 321-325.
19. Mertikas, S.P. and Rizos, C., 1997. Online Detection of Abrupt Changes in the Carrier Phase Measurement of GPS. J. Geod., 71: 469-482.
20. Oppenheimer, M., 1998. Global Warming and the Stability of the West Antarctic Ice Sheet. Nature, 393: 325-332.
21. Padman, L., Fricker, H.A., Coleman, R., Howard, S. and Erofeeva, L., 2002. A New Tide Model for the Antarctic Ice Shelves and Seas. Ann. Glaciol., 34: 247-254.
22. Rott, H., Rack, W., Nagler, T. and Skvarca, P., 1998. Climatically Induced Retreat and Collapse of Northern Larsen Ice Shelf, Antarctic Peninsula. Ann. Glaciol., 27: 86-92.
23. Scambos, T., Hulbe, C. and Fahnestock, M., 2003. Climate-induced Ice Shelf Disintegration in the Antarctic Peninsula, in Domack, E. et al. (Eds.), 2003. Antarctic Peninsula Climate Variability: Historical and Paleoenvironmental Perspectives, Antarct. Res. Ser., 79, AGU, Washington, 79-92.
24. Turner, J., Lachlan-Cope, T.A., Colwell, S., Marshall, G.J. and Connolley, W.M., 2006. Significant Warming of the Antarctic Winter Troposphere. Science, 311: 1914-1917.
25. Van der Veen, C.J., 1998. Fracture Mechanics Approach to Penetration of Surface Crevasses on Glaciers. Cold Reg. Sci. Technol., 27: 31-47.
26. Vaughan, D., 1993. Relating the Occurrence of Crevasses to Surface Strain Rates. J. Glaciol., 39 (132): 255-266.
27. Welsch, W., 1983. Finite Element Analysis of Strain Patterns from Geodetic Observations across Plate Margins. Tectonophysics, 97: 57-71.
28. Young, N.W. and Hyland, G., 2002. Velocity and Strain Rates Derived from InSAR Analysis over the Amery Ice Shelf, East Antarctica. Ann. Glaciol., 34 (1): 228-234.
29. Zhang, X. and Andersen, O.B., 2006. Surface Ice Flow Velocity and Tide Retrieval of the Amery Ice Shelf using Precise Point Positioning. J. Geod., 80: 171-176." name="eprints.referencetext" />
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<meta content="Ice shelves are important components of the Antarctic ice sheet due to their ice-ocean-atmosphere interface and vulnerability to global increases (or decreases) in atmospheric and oceanic temperatures. The development of rifts, which are fractures that penetrate through the entire ice shelf thickness, precede large tabular iceberg detachment and can lead to ice shelf break-up. Changes in strain rates on an active propagating rift system on the Amery Ice Shelf, East Antarctica are determined using in-situ Global Positioning System (GPS) measurements. Results for the 2002/03 Antarctic summer period (Dec-Feb) confirm previous observations by [2] that rift propagation occurs in episodic bursts separated by several days. Transverse-to-flow (i.e. parallel-to-rift) strain rates exceed longitudinal-to-flow (i.e. normal-to-rift) rates by up to a factor of 5 and maximum principal strain rates around the rift tip vary from 12 to 21 [x 10-3/yr]. A rotation in the direction of the principal strain is evident around the rift tip, indicating a change in the mechanics of rift fracture. It is demonstrated that cumulative sum analysis [12], obtained by differencing a pair of residual baseline time series situated approximately normal and parallel to the rift, is an effective method to detect small baseline length changes." name="DC.description" />
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<h1 class="ep_tm_pagetitle">GPS-derived strain rates on an active ice shelf rift</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Janssen, Volker</span> and <span class="person_name">Coleman, Richard</span> and <span class="person_name">Bassis, Jeremy N.</span> (2007) <xhtml:em>GPS-derived strain rates on an active ice shelf rift.</xhtml:em> Survey Review . ISSN 0039-6265 (In Press)</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/1466/1/Janssen_etal_2007_Survey_Review.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1466/1/Janssen_etal_2007_Survey_Review.pdf"><span class="ep_document_citation">PDF (In-Press Version)</span></a> - Full text restricted - Requires a PDF viewer<br />877Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="1872" name="docid" accept-charset="utf-8" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://www.surveyreview.org/index.html">http://www.surveyreview.org/index.html</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Ice shelves are important components of the Antarctic ice sheet due to their ice-ocean-atmosphere interface and vulnerability to global increases (or decreases) in atmospheric and oceanic temperatures. The development of rifts, which are fractures that penetrate through the entire ice shelf thickness, precede large tabular iceberg detachment and can lead to ice shelf break-up. Changes in strain rates on an active propagating rift system on the Amery Ice Shelf, East Antarctica are determined using in-situ Global Positioning System (GPS) measurements. Results for the 2002/03 Antarctic summer period (Dec-Feb) confirm previous observations by [2] that rift propagation occurs in episodic bursts separated by several days. Transverse-to-flow (i.e. parallel-to-rift) strain rates exceed longitudinal-to-flow (i.e. normal-to-rift) rates by up to a factor of 5 and maximum principal strain rates around the rift tip vary from 12 to 21 [x 10-3/yr]. A rotation in the direction of the principal strain is evident around the rift tip, indicating a change in the mechanics of rift fracture. It is demonstrated that cumulative sum analysis [12], obtained by differencing a pair of residual baseline time series situated approximately normal and parallel to the rift, is an effective method to detect small baseline length changes.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">GPS, strain rates, ice shelf rifting, Amery Ice Shelf</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/291000.html">290000 Engineering and Technology > 291000 Geomatic Engineering</a><br /><a href="http://eprints.utas.edu.au/view/subjects/291001.html">290000 Engineering and Technology > 291000 Geomatic Engineering > 291001 Geodesy</a><br /><a href="http://eprints.utas.edu.au/view/subjects/260115.html">260000 Earth Sciences > 260100 Geology > 260115 Glaciology</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1466</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Volker Janssen</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">26 Jul 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">04 Feb 2008 12:01</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1466;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=1466">item control page</a></p>
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