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Summary of Proposal OCE2616

TitleMelt impact on Ice shelf Dynamics And Stability (MIDAS)
Investigator Luckman, Adrian - Swansea University, School of the Environment and Society
Team Member
Dr Bevan, Suzanne - Swansea University, Geography
Summary P { margin-bottom: 0.08in; }Objectives Theobjectives of this proposal are to acquire contemporary data to helpmeet the remote-sensing objective of an existing project, MIDAS (theimpact of Melt on Ice shelf Dynamics and Stability). MIDAS isdesigned to test the hypothesisthat climatically controlled atmospheric warming preconditionsAntarctic ice shelves for collapse by: (1) warming the firn and icecolumn leading to ice-shelf acceleration and critical changes to thestress field, and; (2) compacting the firn to provide conditions forponding which can promote crevasse propagation by hydrofracture. Theimpact of surface melt development, ponding, firn infiltration andrefreezing on the thermal evolution, flow and stress fields,fracturing and implied stability of a large Antarctic ice shelf, willbe assessed using a combination of numerical modelling, satelliteremote sensing and in-situ field data collection. Specifically,the remote sensing objectives are to assess trends in ice dynamics bycomparing the 2007-10 NASA MEaSUREs velocity product with surfacevelocities derived by feature tracking between satellite datasetsbefore and since, and to establish patterns of surface melt andponding throughout the satellite record (1980 to present) by means ofmicrowave and optical imagery. Method Pairs of TerraSAR-X datawill be used to measure surface velocities via feature tracking.Directed TerraSAR-X acquisitions will have the advantage overarchived data in that we will be able to calculate surface velocityfields close in time to the collection of geophysical field data.TerraSAR-X will also provide very high resolution images invaluablefor guiding and aiding interpretation of fieldwork activities, andidentifying regions of melt and crevassing. Data requirements We require 10 pairs ofstripmap images during each of two austral winters prior to field work. That is 10pairs in September 2014 and 10 pairs in September 2015. The imageswill be mosaiced to cover the entire Larsen-C ice shelf. The deliverables willinclude 2 velocity maps of Larsen C ice shelf, for 2 consecutivewinters. Funding Funding for the data isalready provided through a project funded by the UK Natural Environment Research Council (NERC). 8000 have been granted to cover COFUR prices for 40 standard TerraSAR-X frames.

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