| Records |
| Author |
Beine Harry, Anastasio Cort, Esposito Giulio, Patten Kelley, Wilkening Elizabeth, Domine Florent, Voisin Didier, Barret Manuel, Houdier Stephan, Hall Sam, |
| Title |
Soluble, light-absorbing species in snow at Barrow, Alaska
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Type |
Journal Article |
| Year |
2011 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
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| Volume |
116 |
Issue |
|
Pages |
D00R05- |
| Keywords |
HULIS, OASIS, chromophores, light absorption, snow pack, 0317 Atmospheric Composition and Structure: Chemical kinetic and photochemical properties, 0322 Atmospheric Composition and Structure: Constituent sources and sinks, 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry, 0736 Cryosphere: Snow (1827, 1863), |
| Abstract |
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Programme  |
1017 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
AGU |
Place of Publication |
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| Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0148-0227 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
1145 |
| Permanent link to this record |
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| Author |
France J L, Reay H J, King M D, Voisin D, Jacobi H W, Domine F, Beine H, Anastasio C, MacArthur A, Lee-Taylor J, |
| Title |
Hydroxyl radical and NOx production rates, black carbon concentrations and light-absorbing impurities in snow from field measurements of light penetration and nadir reflectivity of onshore and offshore coastal Alaskan snow |
Type |
Journal Article |
| Year |
2012 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
|
| Volume |
117 |
Issue |
|
Pages |
D00R12 ST - |
| Keywords |
Barrow OH black carbon e-folding depth nitrate photochemistry 0736 Cryosphere: Snow (1827, 1863) 0770 Cryosphere: Properties 0798 Cryosphere: Modeling (1952, 4316), |
| Abstract |
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| Programme |
1017 |
| Campaign |
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| Address |
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Place of Publication |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0148-0227 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
1698 |
| Permanent link to this record |
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| Author |
Domine Florent, Bock Josu, Morin Samuel, Giraud Grald, |
| Title |
Linking the effective thermal conductivity of snow to its shear strength and density
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Type |
Journal Article |
| Year |
2011 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
|
| Volume |
116 |
Issue |
F4 |
Pages |
F04027- |
| 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), |
| 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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| Programme |
1017 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
AGU |
Place of Publication |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0148-0227 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
1171 |
| Permanent link to this record |
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| Author |
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| Title |
Structure, specific surface area and thermal conductivity of the snowpack around Barrow, Alaska |
Type |
Journal Article |
| Year |
2012 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
|
| Volume |
117 |
Issue |
|
Pages |
D00R14 ST - |
| Keywords |
Arctic atmospheric chemistry climate contaminants polar snow 0475 Biogeosciences: Permafrost, cryosphere, and high-latitude processes (0702, 0716) 0718 Cryosphere: Tundra (9315) 0736 Cryosphere: Snow (1827, 1863) 0750 Cryosphere: Sea ice (4540) 0792 Cryosphere: Contaminants (0432), |
| Abstract |
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| Programme |
1017 |
| Campaign |
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Place of Publication |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0148-0227 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
1337 |
| Permanent link to this record |
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| Author |
Beine Harry, Anastasio Cort, Domine Florent, Douglas Thomas, Barret Manuel, France James, King Martin, Hall Sam, Ullmann Kirk, |
| Title |
Soluble chromophores in marine snow, seawater, sea ice and frost flowers near Barrow, Alaska
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Type |
Journal Article |
| Year |
2012 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
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| Volume |
117 |
Issue |
|
Pages |
D00R15- |
| 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, |
| Abstract |
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| Programme |
1017 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
AGU |
Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0148-0227 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
989 |
| Permanent link to this record |
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| Author |
H. W. Jacobi, D. Voisin, J. L. Jaffrezo, J. Cozic, T. A. Douglas |
| Title |
Chemical composition of the snowpack during the OASIS spring campaign 2009 at Barrow, Alaska |
Type |
Journal |
| Year |
2012 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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| Volume |
117 |
Issue |
D14 |
Pages |
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| Keywords |
Alaska Arctic Barrow Chemistry Snow |
| Abstract |
The chemical composition of the seasonal snowpack was determined close to Barrow, an Arctic coastal location in northern Alaska. One hundred and twelve samples of different snow types including fresh snow, surface hoar, diamond dust, blowing snow, rounded snow grains, and depth hoar were collected and analyzed for major sea salt components, bromide, and nitrate. Sodium, chloride, sulfate, and potassium are mainly introduced into the snowpack by the deposition of sea salt, while magnesium and calcium result from a combination of sea salt and dust. Sulfate was strongly depleted in most samples compared to other sea salt components. This is attributed to the precipitation of mirabilite in newly formed sea ice and frost flowers that leads to an efficient fractionation of sulfate. Uptake of volatile but soluble species from the gas phase also contributed to the observed chloride, sulfate, and nitrate in the snow. However, for chloride and sulfate the input from the marine sources was overwhelming and the uptake from the gas phase was only visible in the samples with low concentrations like fresh snow, diamond dust, and surface hoar. Nitrate concentrations in the snowpack were less variable and for aged snow nitrate was related to the specific surface area of the snow indicating the adsorption of nitric acid can be an important nitrate source in the aged snow. Bromide was also introduced into the snowpack from marine sources, but due to its high reactivity it was partly transferred back to the atmosphere in the form of reactive species. The result of these processes was evident in bromide concentrations, which were both enriched and depleted at the snowpack surface while deeper layers were mostly depleted. Blowing snow also exhibited a depleted bromide composition. For all compounds except nitrate, many depth hoar samples exhibited the greatest concentrations, probably as a result of higher input earlier in the season as well as increases due to the sublimation of water during the metamorphism of the snow. |
| Programme |
1017 |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
2156-2202 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8163 |
| Permanent link to this record |
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| Author |
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| Title |
Role of Nitrite in the Photochemical Formation of Radicals in the Snow |
Type |
Journal |
| Year |
2014 |
Publication |
Environmental Science & Technology |
Abbreviated Journal |
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| Volume |
48 |
Issue |
1 |
Pages |
165-172 |
| Keywords |
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| Abstract |
Photochemical reactions in snow can have an important impact on the composition of the atmosphere over snow-covered areas as well as on the composition of the snow itself. One of the major photochemical processes is the photolysis of nitrate leading to the formation of volatile nitrogen compounds. We report nitrite concentrations determined together with nitrate and hydrogen peroxide in surface snow collected at the coastal site of Barrow, Alaska. The results demonstrate that nitrite likely plays a significant role as a precursor for reactive hydroxyl radicals as well as volatile nitrogen oxides in the snow. Pollution events leading to high concentrations of nitrous acid in the atmosphere contributed to an observed increase in nitrite in the surface snow layer during nighttime. Observed daytime nitrite concentrations are much higher than values predicted from steady-state concentrations based on photolysis of nitrate and nitrite indicating that we do not fully understand the production of nitrite and nitrous acid in snow. The discrepancy between observed and expected nitrite concentrations is probably due to a combination of factors, including an incomplete understanding of the reactive environment and chemical processes in snow, and a lack of consideration of the vertical structure of snow. |
| Programme |
1017 |
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Series Issue |
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Edition |
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| ISSN |
0013-936X |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8164 |
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| Author |
Lev Vinnik, Elena Kozlovskaya, Sergey Oreshin, Grigoriy Kosarev, Katerina Piiponen, Hanna Silvennoinen |
| Title |
The lithosphere, LAB, LVZ and Lehmann discontinuity under central Fennoscandia from receiver functions |
Type |
Journal |
| Year |
2016 |
Publication |
Tectonophysics |
Abbreviated Journal |
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| Volume |
667 |
Issue |
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Pages |
189-198 |
| Keywords |
LAB Lehmann discontinuity Low-velocity zone Partial melting Receiver functions Seismic anisotropy |
| Abstract |
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| Programme |
1021 |
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| ISSN |
0040-1951 |
ISBN |
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Conference |
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Approved |
yes |
| Call Number |
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Serial |
8166 |
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| Author |
Olga Usoltseva, Elena Kozlovskaya |
| Title |
Studying local earthquakes in the area Baltic-Bothnia Megashear using the data of the POLENET/LAPNET temporary array |
Type |
Journal |
| Year |
2016 |
Publication |
Solid Earth |
Abbreviated Journal |
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| Volume |
7 |
Issue |
4 |
Pages |
1095-1108 |
| Keywords |
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| Abstract |
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| Programme |
1021 |
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Series Issue |
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Edition |
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| ISSN |
1869-9510 |
ISBN |
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Conference |
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Approved |
yes |
| Call Number |
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Serial |
8168 |
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| Author |
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| Title |
Anisotropic lithosphere under the Fennoscandian shield from P receiver functions and SKS waveforms of the POLENET/LAPNET array |
Type |
Journal |
| Year |
2014 |
Publication |
Tectonophysics |
Abbreviated Journal |
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| Volume |
628 |
Issue |
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Pages |
45-54 |
| Keywords |
Asthenosphere Lithosphere Mantle flow Receiver functions Seismic anisotropy Shear-wave splitting |
| Abstract |
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| Programme |
1021 |
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Series Issue |
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Edition |
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| ISSN |
0040-1951 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8169 |
| Permanent link to this record |
