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Snow Accumulation Variability in Adelie Land (East Antarctica) Derived from Radar and Firn Core Data. a 600 Km Transect from Dome C : Volume 6, Issue 4 (24/07/2012)

By Verfaillie, D.

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Book Id: WPLBN0004022702
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Snow Accumulation Variability in Adelie Land (East Antarctica) Derived from Radar and Firn Core Data. a 600 Km Transect from Dome C : Volume 6, Issue 4 (24/07/2012)  
Author: Verfaillie, D.
Volume: Vol. 6, Issue 4
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Meur, E. L., Fily, M., Magand, O., Verfaillie, D., Jourdain, B., Favier, V., & Arnaud, L. (2012). Snow Accumulation Variability in Adelie Land (East Antarctica) Derived from Radar and Firn Core Data. a 600 Km Transect from Dome C : Volume 6, Issue 4 (24/07/2012). Retrieved from http://nook-library.net/


Description
Description: Laboratoire de Glaciologie et Géophysique de l'Environnement, UMR5183, Saint-Martin-d'Hères, France. Polar ice sheets mass balance is a timely topic intensively studied in the context of global change and sea-level rise. However, obtaining mass balance estimates in Antarctica in particular, remains difficult due to various logistical problems. In the framework of the TASTE-IDEA program, labeled as an International Polar Year project, continuous Ground Penetrating Radar (GPR) measurements were carried out during a traverse realised in Adelie Land (East Antarctica) during the 2008–2009 austral summer between the Italo-French Dome C (DC) polar plateau site and French Dumont D'Urville (DdU) coastal station. The aim of this study was to process and interpret GPR data in terms of snow accumulation, to analyse its spatial and temporal variability along the DC-DdU traverse and compare it with historical data and modeling. The emphasis has been put on the last 300 yr, from the pre-industrial to recent time period. Beta-radioactivity counting and gamma spectrometry were studied in cores at LGGE laboratory, providing a depth-age calibration for radar measurements. Over the 600 km of usable GPR data, depth and snow accumulation were determined with the help of three distinct layers visible on the radargrams (≈1730, 1799 and 1941 AD). Preliminary results reveal a gradual accumulation increase towards the coast and the occurrence of previously undocumented undulating structures between 300 and 600 km from DC. Results agree fairly well with data from previous studies and modeling. Concluding on temporal variations is difficult because of the margin of error introduced by density estimation. This study should have various applications such as for model validation.

Summary
Snow accumulation variability in Adelie Land (East Antarctica) derived from radar and firn core data. A 600 km transect from Dome C

Excerpt
Agosta, C., Favier, V., Genthon, C., Gall{é}e, H., Krinner, G., Lenaerts, J., and van den Broeke, M.: A 40-year accumulation dataset for Adelie Land, Antarctica and its application for model validation, Clim. Dynam., 38, 75–86, doi:10.1007/s00382-011-1103-4, 2011.; Agosta, C., Favier, V., Genthon, C., Gallée, H., and Krinner, G.: High resolution modeling of the Antarctic surface mass balance, Part I: Model description and validation, Clim. Dynam., submitted, 2012.; Arthern, R., Winebrenner, D., and Vaughan, D.: Antarctic snow accumulation mapped using polarization of 4.3-cm wavelength microwave emission, J. Geophys. Res., 111, D06107, doi:10.1029/2004JD005667, 2006.; Bromwich, D., Guo, Z., Bai, L., and Chen, Q.: Modeled antarctic precipitation. Part I: Spatial and temporal variability, J. Climate, 17, 427–447, 2004.; Castellano, E., Becagli, S., Hansson, M., Hutterli, M., Petit, J. R., Rampino, M. R., Severi, M., Steffensen, J. P., Traversi, R., and Udisti, R.: Holocene volcanic history as recorded in the sulfate stratigraphy of the European Project for Ice Coring in Antarctica Dome C (EDC96) ice core, J. Geophys. Res., 110, D06114, doi:10.1029/2004JD005259, 2005.; Daniels, J.: Ground Penetrating Radar Fundamentals, prepared as an appendix to a report to the US EPA, Region V, Department of Geological Sciences, The Ohio State University, 2000.; Eisen, O., Frezzotti, M., Genthon, C., Isaksson, E., Magand, O., Broeke, M., Dixon, D., Ekaykin, A., Holmlund, P., Kameda, T., Karlöf, L., Kaspari, S., Lipenkov, V., Oerter, H., Takahashi, S., and Vaughan, D.: Ground-based measurements of spatial and temporal variability of snow accumulation in East Antarctica, Rev. Geophys., 46, RG2001, doi:10.1029/2006RG000218, 2008.; Favier, V., Agosta, C., Genthon, C., Arnaud, L., Trouvillez, A., and Gallée, H.: Modeling the mass and surface heat budgets in a coastal blue ice area of Adelie Land, Antarctica, J. Geophys. Res., 116, F03017, doi:10.1029/2010JF001939, 2011.; Frezzotti, M., Gandolfi, S., and Urbini, S.: Snow megadunes in Antarctica: sedimentary structure and genesis, J. Geophys. Res., 107, 4344, doi:10.1029/2001JD000673, 2002.; Frezzotti, M., Pourchet, M., Flora, O., Gandolfi, S., Gay, M., Urbini, S., Vincent, C., Becagli, S., Gragnani, R., Proposito, M., Severi, M., Traversi, R., Udisti, R., and Fily, M.: New estimations of precipitation and surface sublimation in East Antarctica from snow accumulation measurements, Clim. Dynam., 23, 803–813, 2004.; Gallée, H. and Pettré, P.: Dynamical constraints on katabatic wind cessation in Adélie Land, Antarctica, J. Atmos. Sci., 55, 1755–1770, 1998.; Frezzotti, M., Pourchet, M., Flora, O., Gandolfi, S., Gay, M., Urbini, S., Vincent, C., Becagli, S., Gragnani, R., Proposito, M., Severi, M., Traversi,&a

 

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