World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

The Sub-ice Platelet Layer and Its Influence on Freeboard to Thickness Conversion of Antarctic Sea Ice : Volume 8, Issue 3 (11/06/2014)

By Price, D.

Click here to view

Book Id: WPLBN0003980857
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: The Sub-ice Platelet Layer and Its Influence on Freeboard to Thickness Conversion of Antarctic Sea Ice : Volume 8, Issue 3 (11/06/2014)  
Author: Price, D.
Volume: Vol. 8, Issue 3
Language: English
Subject: Science, Cryosphere
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Barnsdale, K., Rack, W., Langhorne, P. J., Haas, C., Price, D., & Leonard, G. (2014). The Sub-ice Platelet Layer and Its Influence on Freeboard to Thickness Conversion of Antarctic Sea Ice : Volume 8, Issue 3 (11/06/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Gateway Antarctica, University of Canterbury, Christchurch, New Zealand. This is an investigation to quantify the influence of the sub-ice platelet layer on satellite measurements of total freeboard and their conversion to thickness of Antarctic sea ice. The sub-ice platelet layer forms as a result of the seaward advection of supercooled ice shelf water from beneath ice shelves. This ice shelf water provides an oceanic heat sink promoting the formation of platelet crystals which accumulate at the sea ice–ocean interface. The build-up of this porous layer increases sea ice freeboard, and if not accounted for, leads to overestimates of sea ice thickness from surface elevation measurements. In order to quantify this buoyant effect, the solid fraction of the sub-ice platelet layer must be estimated. An extensive in situ data set measured in 2011 in McMurdo Sound in the southwestern Ross Sea is used to achieve this. We use drill-hole measurements and the hydrostatic equilibrium assumption to estimate a mean value for the solid fraction of this sub-ice platelet layer of 0.16. This is highly dependent upon the uncertainty in sea ice density. We test this value with independent Global Navigation Satellite System (GNSS) surface elevation data to estimate sea ice thickness. We find that sea ice thickness can be overestimated by up to 19%, with a mean deviation of 12% as a result of the influence of the sub-ice platelet layer. It is concluded that within 100 km of an ice shelf this influence might need to be considered when undertaking sea ice thickness investigations using remote sensing surface elevation measurements.

Summary
The sub-ice platelet layer and its influence on freeboard to thickness conversion of Antarctic sea ice

Excerpt
Albrecht, N., Vennell, R., Williams, M., Stevens, C., Langhorne, P., Leonard, G., and Haskell, T.: Observation of sub-inertial internal tides in McMurdo Sound, Antarctica, Geophys. Res. Lett., 33, L24606, doi:10.1029/2006GL027377, 2006.; Bindschadler, R., Choi, H., Wichlacz, A., Bingham, R., Bohlander, J., Brunt, K., Corr, H., Drews, R., Fricker, H., Hall, M., Hindmarsh, R., Kohler, J., Padman, L., Rack, W., Rotschky, G., Urbini, S., Vornberger, P., and Young, N.: Getting around Antarctica: new high-resolution mappings of the grounded and freely-floating boundaries of the Antarctic ice sheet created for the International Polar Year, The Cryosphere, 5, 569–588, doi:10.5194/tc-5-569-2011, 2011.; Bintanja, R., Van Oldenborgh, G. J., Drijfhout, S. S., Wouters, B., and Katsman, C. A.: Important role for ocean warming and increased ice-shelf melt in Antarctic sea-ice expansion, Nature Geoscience, 6, 376–379, doi:10.1038/ngeo1767, 2013.; Comiso, J. C., Kwok, R., Martin, S., and Gordon, A. L.: Variability and trends in sea ice extent and ice production in the Ross Sea, J. Geophys. Res., 116, C04021, doi:10.1029/2010JC006391, 2011.; Dempsey, D. E., Langhorne, P. J., Robinson, N. J., Williams, M. J. M., Haskell, T. G., and Frew, R. D.: Observation and modeling of platelet ice fabric in McMurdo Sound, Antarctica, J. Geophys. Res., 115, C01007, doi:10.1029/2008JC005264, 2010.; Drosg, M.: Dealing with uncertainties: A guide to error analysis, Dordrecht, Netherlands, Springer, 2009.; Fraser, A. D., Massom, R. A., Michael, K. J., Galton-Fenzi, B. K., and Lieser, J. L.: East Antarctic landfast sea ice distribution and variability, 2000-08, J. Climate, 25, 1137–1156, doi:10.1175/JCLI-D-10-05032.1, 2012.; Gough, A. J.: Sea ice near and ice shelf, Doctor of Philosophy Thesis, University of Otago, Dunedin, New Zealand, 2012.; Gough, A. J., Mahoney, A. R., Langhorne, P. J., Williams, M. J. M., Robinson, N. J., and Haskell, T. G.: Signatures of supercooling: McMurdo Sound platelet ice, J. Glaciol., 58, 38–50, doi:10.3189/2012JoG10J218, 2012.; Gow, A. J., Ackley, S. F., Govoni, J. W., and Weeks, W. F.: Physical and Structural Properties of Land-Fast Sea Ice in McMurdo Sound, Antarctica, in Antarctic Sea Ice: Physical Processes, Interactions and Variability, edited by: Jeffries, M. O., American Geophysical Union, Washington, D.C., doi:10.1029/AR074p0355, 1998.; Haas, C. and Druckenmiller, M.: Ice thickness and roughness measurements, in: Sea-ice handbook, edited by: Eicken, H., University of Alaska Press, 2009.; Hellmer, H. H.: Impact of Antarctic ice shelf basal melting on sea ice and deep ocean properties, Geophys. Res. Lett., 31, l10307, doi:10.1029/2004GL019506, 2004.; Hughes, K. G., Langhorne, P. J., Leonard, G. H., and Stevens, C. L.: Extension of an ice shelf water plume model beneath sea ice with application in McMurdo Sound, Antarctica. J. Geophys. Res.-Oceans, submitted, 2014.; Kurtz, N. T. and Markus, T.: Satellite observations of Antarctic sea ice thickness and volume, J. Geophys. Res., 117, C08025, doi:10.1029/2012JC008141, 2012.; Langhorne, P. J., Purdie, C. R., Smith, I. J., Leonard, G. H., Kempema, E. W., Petrich, C., Gribble, M. A., Bond, P. E., and Haskell, T. G.: Antarctic landfast sea ice: the role of platelet ice, edited by: Saeki, H. (Ed.), in: IAHR International Symposium on Ice. Sapporo, Japan: Nakanishi Pu


 

Click To View

Additional Books


  • Snow Specific Surface Area Simulation Us... (by )
  • Implementation and Evaluation of Prognos... (by )
  • Abhandlungen Der Königlichen Akademie De... Volume: 1830 (by )
  • Coastal Observing and Forecasting System... (by )
  • A Modified Drought Index for Wmo Ra VI :... (by )
  • Wave Climate in the Arkona Basin, the Ba... (by )
  • The 2011 Marine Heat Wave in Cockburn So... (by )
  • Nature; Volume: 77 Nov. 1907 - Apr. 1908 (by )
  • Snowfall in the Himalayas: an Uncertain ... (by )
  • Nature; Volume: 78 May-Oct 1908 (by )
  • Sensitivity of the Weddell Sea Sector Ic... (by )
  • Internal Tides and Energy Fluxes Over Gr... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.