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Gas diffusivity and air permeability of the firn from cold polar sites.

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Call No.	Ph.D. 2007
Author	Courville, Zoe René
Title	Gas diffusivity and air permeability of the firn from cold polar sites.
Date	2007
Abstract	Recent field investigations of a megadunes region of East Antarctica provide evidence that differences in grain size, thermal conductivity, and permeability across a megadune are due to relative accumulation patterns in the absence of significant variations in microclimate. The differences in accumulation patterns include distinct areas of perceptible but low accumulation (less than 40 mm w.eq.a -1) and areas of accumulation hiatus within several kilometers proximity, as determined by remote sensing, surface feature classification, and GPR profiling. Near-surface firn properties are very sensitive to the amount of accumulation in low accumulation rate regions, with relatively small differences in accumulation rate (less than 40 mm w.eq.a -1) creating distinctive differences in grain size, thermal conductivity, and permeability, accompanied by variations in satellite-based microwave data from both passive and active sensors. Cores from the megadunes region exhibit variations in physical properties at depth due to temporal changes in local accumulation caused by dune migration. A new way of describing gas diffusivity and air permeability of polar firn is developed. Diffusivity-porosity and permeability-porosity power-law relationships vary from site to site with accumulation rate having the largest impact on the value of the exponent. The largest differences in firn properties occur between firn from hiatus sites compared to sites where any accumulation, from low to high values, occurs.
Description	xv, 195 leaves : illustrations (some color)
Format	application/pdf
Advisor	Albert, Mary
Subject	Snow -- Permeability. ; Snow surveys -- Antarctica -- East Antarctica. ; Surfaces -- Areas and volumes. ; Gas flow. ; Porosity.
College	Thayer School of Engineering.
Issuing Body	Dartmouth Dissertations are made available through the Dartmouth Digital Library.
Degree	Thesis (Ph.D)--Dartmouth College.
Copyright	In Copyright. This material is protected by copyright and/or related rights. You are free to use this material in any way that is permitted by copyright law that applies to your use. For other uses, you need to obtain permission from the rights-holder(s). http://rightsstatements.org/page/InC/1.0/
DOI	https://doi.org/10.1349/ddlp.3523

Title	courville2007 1
Full Text	GAS DIFFUSIVITY AND AIR PERMEABILITY OF THE FIRN FROM COLD POLAR SITES A Thesis Submitted to the Faculty in partial fulfillment of the requirements for the degree of Doctor of Philosophy By ZOE RENÉE COURVILLE Thayer School of Engineering Dartmouth College Hanover, New Hampshire JANUARY 2007 © 2007 Trustees of Dartmouth College

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