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Record #164686:

Preliminary firn-densification model with 38-site dataset / M.K. Spencer, R.B. Alley, T.T. Creyts.

Title: Preliminary firn-densification model with 38-site dataset / M.K. Spencer, R.B. Alley, T.T. Creyts.
Author(s): Spencer, M. K.
Alley, R. B.
Creyts, T. T.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(159) (2001)
Abstract: Presents model of firn densification based on hot isostatic pressing with power-law creep. Assumes densification rates functionally dependent on temperature, density and overburden load and that firn density profiles are in steady state with observed mean annual temperature and accumulation rate. Divides densification process into three depth stages. Modifies near-surface temperatures to allow for non-linear dependence on a temperature that varies through year. Inverts data for 15 model parameters using 38 depth-density profiles from locations collectively spanning a large range of mean annual temperature and accumulation rate. Set of best-fit rate equations contains non-physical values for some parameters, indicating, e.g., that an increase in pressure causes a decrease in densification rate at some depths. Attributes this to depth dependence of both density and pressure and possibly to non- steady state. Compares fits of this and other models to data. Concludes present model is slight improvement for range of conditions spanned by this dataset, but poorer when extrapolated beyond them. Doubts reliability of models outside modern range of temperature and accumulation rate.
Notes:

Journal of Glaciology. Vol. 47(159) :671-676 (2001).

Keywords: 519.673 -- Modelling.
551.578.463 -- Snow cover, firnification.
E3 -- Glaciology: instruments and methods.
SPRI record no.: 164686

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245 10 ‡aPreliminary firn-densification model with 38-site dataset /‡cM.K. Spencer, R.B. Alley, T.T. Creyts.
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500 ## ‡aJournal of Glaciology. Vol. 47(159) :671-676 (2001).
520 3# ‡aPresents model of firn densification based on hot isostatic pressing with power-law creep. Assumes densification rates functionally dependent on temperature, density and overburden load and that firn density profiles are in steady state with observed mean annual temperature and accumulation rate. Divides densification process into three depth stages. Modifies near-surface temperatures to allow for non-linear dependence on a temperature that varies through year. Inverts data for 15 model parameters using 38 depth-density profiles from locations collectively spanning a large range of mean annual temperature and accumulation rate. Set of best-fit rate equations contains non-physical values for some parameters, indicating, e.g., that an increase in pressure causes a decrease in densification rate at some depths. Attributes this to depth dependence of both density and pressure and possibly to non- steady state. Compares fits of this and other models to data. Concludes present model is slight improvement for range of conditions spanned by this dataset, but poorer when extrapolated beyond them. Doubts reliability of models outside modern range of temperature and accumulation rate.
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡a551.578.463 -- Snow cover, firnification.‡2udc
650 07 ‡aE3 -- Glaciology: instruments and methods.‡2local
700 1# ‡aAlley, R. B.
700 1# ‡aCreyts, T. T.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 47(159) (2001) ‡wSPRI-20534
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