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Author |
Domine Florent, Bock Josu, Morin Samuel, Giraud Grald, |
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Title |
Linking the effective thermal conductivity of snow to its shear strength and density
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Journal Article |
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Year |
2011 |
Publication |
J. Geophys. Res. |
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Volume |
116 |
Issue |
F4 |
Pages |
F04027- |
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Keywords |
avalanche, shear strength, snow, thermal conductivity, 0736 Cryosphere: Snow (1827, 1863), 0742 Cryosphere: Avalanches (4302), 0770 Cryosphere: Properties, 0776 Cryosphere: Glaciology (1621, 1827, 1863), |
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Abstract |
The effective thermal conductivity of snow, keff, is a crucial climatic and environmental variable. Here, we test the intuition that keff is linked to microstructural and mechanical properties by attempting to relate keff to density ρsnow, and to shear strength σ measured with a handheld shear vane. We performed 106 combined measurements of keff, ρsnow and σ in the Alps, Svalbard, Arctic Alaska, and near the North Pole, covering essentially all snow types. We find a good correlation between keff and ρsnow which is not significantly different from that of Sturm et al. (1997). The correlation between keff and a combination of σ and ρsnow is stronger than with density alone. We propose an equation linking keff, (W m-1 K-1) ρsnow (kg m-3) and σ (Pa): keff = 7.114 10-5 ρsnow σ0.333 + 2.367 10-2. This equation places constraints on the calculation of keff, ρsnow and σ in avalanche warning models where σ is a key variable. For our samples, we calculate σ from measured values of keff and ρsnow using our equation and compare the value to that predicted by the French MEPRA avalanche warning model, which uses density and grain type as input data. MEPRA and the prediction of σ based on keff and ρsnow agree within 8%. MEPRA agrees with observations within 11%. Calculating σ from density only yields values 55% lower than measured, showing the interest of using additional data to predict σ.
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1017 |
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AGU |
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0148-0227 |
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yes |
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1171 |
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Beine Harry, Anastasio Cort, Domine Florent, Douglas Thomas, Barret Manuel, France James, King Martin, Hall Sam, Ullmann Kirk, |
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Title |
Soluble chromophores in marine snow, seawater, sea ice and frost flowers near Barrow, Alaska
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Journal Article |
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Year |
2012 |
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J. Geophys. Res. |
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Volume |
117 |
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Pages |
D00R15- |
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Keywords |
OASIS, chromophores, colored dissolved organic matter (CDOM), frost flowers, light absorption, marine, 0317 Atmospheric Composition and Structure: Chemical kinetic and photochemical properties, 0322 Atmospheric Composition and Structure: Constituent sources and sinks, 0736 Cryosphere: Snow (1827, 1863), 0750 Cryosphere: Sea ice (4540), 4807 Oceanography: Biological and Chemical: Chemical speciation and complexation, |
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1017 |
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AGU |
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0148-0227 |
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989 |
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Author |
Grob M, Maggi A, Stutzmann E, |
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Title |
Observations of the seasonality of the Antarctic microseismic signal, and its association to sea ice variability
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Journal Article |
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Year |
2011 |
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Geophys. Res. Lett. |
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38 |
Issue |
11 |
Pages |
L11302- |
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Keywords |
microseisms, sea, seismic noise, seismology, 0750 Cryosphere: Sea ice, 7299 Seismology: General or miscellaneous, 9310 Geographic Location: Antarctica, |
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133 |
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Bachelor's thesis |
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AGU |
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0094-8276 |
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yes |
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3795 |
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Author |
Van De Vijver B., Denys L. & Beyens L. |
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Title |
Fragilaria husvikensis sp. nov. (Bacillariophyceae), another Fragilaria species with transapical ribs from Subantarctica. |
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Journal Article |
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Year |
2000 |
Publication |
Nova hedwigia |
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Nova Hedwigia |
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Pages |
537-550 |
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136 |
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0029-5035 |
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yes |
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1 |
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Author |
Dubois J. |
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1997 |
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131 |
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Bachelor's thesis |
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yes |
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2 |
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Author |
Angelier J. & Bergerat F. |
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Title |
The South Iceland Seismic zone – Part II: Stress fields and mecanisms of seismogenic faults. |
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Conference - International - Article without Reading Comitee |
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Year |
1997 |
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Abstr., Workshop Prenlab – 1, 24-25 octobre Paris |
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316 |
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6 |
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Author |
Guinard E., Weimreskirch H. & Jouventin P. |
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Title |
Population changes and demography of the northern rockhopper penguin on Amsterdam and Saint Paul islands. |
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Journal Article |
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Year |
1998 |
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Colonial waterbirds |
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21 |
Issue |
2 |
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222-228 |
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109 |
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Bachelor's thesis |
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0738-6028 |
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8 |
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Author |
Riaux-Gobin C., Treguer P. & Poulin M. |
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Conference - National - Article without Reading Comitee |
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1997 |
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296 |
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14 |
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Author |
Shum Woodworth A., Egbert F., King K., Le Provost L.I., Molines P.R., Schlax S. & Tierney V. |
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Title |
Accuracy asessment of recent ocean tide models. |
Type |
Journal Article |
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Year |
1997 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
102 |
Issue |
C11 |
Pages |
25173-25194 |
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688 |
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0148-0227 |
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16 |
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Author |
Salamatin A.N.. & Duval P. |
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Title |
Creep flow and pressure relaxation in bubbly medium. |
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Journal Article |
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Year |
1997 |
Publication |
International journal of solid structures |
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34 |
Issue |
1 |
Pages |
61-78 |
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159 |
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Bachelor's thesis |
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0020-7683 |
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17 |
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