Periodic surface features in coastal East Antarctica

Details Periodic surface features in coastal East Antarctica Periodic surface features in coastal East Antarctica

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3322501a&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 22, CiteID L22501

Physics

4

Cryosphere: Mass Balance (1218, 1223), Geodesy And Gravity: Time Variable Gravity (7223, 7230), Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Atmospheric Processes: Polar Meteorology, Geographic Location: Antarctica (4207)

Scientific paper

We found evidence for highly periodic dunes in a near-coastal area of Dronning Maud Land, East Antarctica. Analysis of accumulation patterns, derived from ground-penetrating radar (GPR) internal layering, and GPS-based characteristics of surface topography, by means of auto- and cross-covariance, indicate quasi-harmonic oscillations of surface undulations, surface slope, and accumulation. The dunes occur at an elevation range of 1000-1350 m with the dominant wavelength of 5 km and undulations of ~10 m. Accumulation and slope are anticorrelated at zero lag, with a mean annual accumulation of some 140 kg m-2 yr-1 and variations on the order of +/-100 kg m-2 yr-1. Our findings have implications for studies aiming at the mass balance of coastal areas in Antarctica.

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