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Author |
Berthier Etienne, Le Bris Raymond, Mabileau Laure, Testut Laurent, Rmy Frdrique, |
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Title |
Ice wastage on the Kerguelen Islands (49S, 69E) between 1963 and 2006
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Type |
Journal Article |
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Year |
2009 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
114 |
Issue |
F3 |
Pages |
F03005 - |
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Keywords |
ice caps, climate change, remote sensing, Kerguelen Islands, Southern Ocean, mass balance, 0720 Cryosphere: Glaciers, 0738 Cryosphere: Ice, 0776 Cryosphere: Glaciology, 0758 Cryosphere: Remote sensing, 0762 Cryosphere: Mass balance, |
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688 |
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AGU |
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ISSN |
0148-0227 |
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yes |
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Call Number |
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Serial |
1858 |
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Author |
Durand G, Gagliardini O, de Fleurian B, Zwinger T, Le Meur E, |
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Title |
Marine ice sheet dynamics: Hysteresis and neutral equilibrium
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Type |
Journal Article |
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Year |
2009 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
114 |
Issue |
F3 |
Pages |
F03009 - |
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Keywords |
marine ice sheet, grounding line, full Stokes modeling, 0774 Cryosphere: Dynamics, 0726 Cryosphere: Ice sheets, 0728 Cryosphere: Ice shelves, 0798 Cryosphere: Modeling, |
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Abstract |
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Programme |
1053 |
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AGU |
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ISSN |
0148-0227 |
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Approved |
yes |
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Call Number |
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Serial |
1877 |
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Author |
Morin S, Savarino J, Frey M M, Domine F, Jacobi H-W, Kaleschke L, Martins J M F, |
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Title |
Comprehensive isotopic composition of atmospheric nitrate in the Atlantic Ocean boundary layer from 65S to 79N
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Type |
Journal Article |
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Year |
2009 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
114 |
Issue |
D5 |
Pages |
D05303 - |
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Keywords |
stable isotopes, atmospheric nitrate, isotope anomaly, 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry, 0454 Biogeosciences: Isotopic composition and chemistry, 0469 Biogeosciences: Nitrogen cycling, 0305 Atmospheric Composition and Structure: Aerosols and particles, 9325 Geographic Location: Atlantic Ocean, |
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Abstract |
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Programme |
1011 |
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Publisher |
AGU |
Place of Publication |
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Edition |
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ISSN |
0148-0227 |
ISBN |
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Medium |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
1882 |
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Author |
Stutzmann Elonore, Schimmel Martin, Patau Genevive, Maggi Alessia, |
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Title |
Global climate imprint on seismic noise
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Type |
Journal Article |
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Year |
2009 |
Publication |
Geochem. Geophys. Geosyst. |
Abbreviated Journal |
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Volume |
10 |
Issue |
11 |
Pages |
Q11004 - |
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Keywords |
seismic noise, microseisms, seismology, 7255 Seismology: Surface waves and free oscillations, 7299 Seismology: General or miscellaneous, |
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Abstract |
In the absence of earthquakes, oceanic microseisms are the strongest signals recorded by seismic stations. Using the GEOSCOPE global seismic network, we show that the secondary microseism spectra have global characteristics that depend on the station latitude and on the season. In both hemispheres, noise amplitude is larger during local winter, and close to the equator, noise amplitude is stable over the year. There is an excellent correlation between microseism amplitude variations over the year and changes in the highest wave areas. Considering the polarization of the secondary microseisms, we show that stations in the Northern Hemisphere and close to the equator record significant changes of the secondary microseism source azimuth over the year. During Northern Hemisphere summer, part or all of the sources are systematically located farther toward the south than during winter. Stations in French Guyana (MPG) and in Algeria (TAM) record microseisms generated several thousand kilometers away in the South Pacific Ocean and in the Indian Ocean, respectively. Thus, secondary microseism sources generated by ocean waves which originate in the Southern Hemisphere can be recorded by Northern Hemisphere stations when local sources are weak. We also show, considering a station close to Antarctica, that primary and secondary microseism noise amplitudes are strongly affected by changes of the sea ice floe and that sources of these microseisms are in different areas. Microseism recording can therefore be used to monitor climate changes.
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Programme |
133 |
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Publisher |
AGU |
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Edition |
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ISSN |
1525-2027 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
1920 |
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Author |
Chisham G, Freeman M P, Abel G A, Bristow W A, Marchaudon A, Ruohoniemi J M, Sofko G J, |
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Title |
Spatial distribution of average vorticity in the high-latitude ionosphere and its variation with interplanetary magnetic field direction and season
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Type |
Journal Article |
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Year |
2009 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
114 |
Issue |
A9 |
Pages |
A09301 - |
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Keywords |
ionosphere, vorticity, field-aligned current, 2431 Ionosphere: Ionosphere/magnetosphere interactions, 2409 Ionosphere: Current systems, 2437 Ionosphere: Ionospheric dynamics, 2494 Ionosphere: Instruments and techniques, 2721 Magnetospheric Physics: Field-aligned currents and current systems, |
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Abstract |
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Programme |
312;911 |
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Address |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Publisher |
AGU |
Place of Publication |
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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 |
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Call Number |
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Serial |
2084 |
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Author |
Legrand M, Preunkert S, Jourdain B, Galle H, Goutail F, Weller R, Savarino J, |
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Title |
Year-round record of surface ozone at coastal (Dumont d'Urville) and inland (Concordia) sites in East Antarctica
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Type |
Journal Article |
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Year |
2009 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
114 |
Issue |
D20 |
Pages |
D20306 - |
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Keywords |
Ozone, Antarctica, 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry, 0368 Atmospheric Composition and Structure: Troposphere: constituent transport and chemistry, 0330 Atmospheric Composition and Structure: Geochemical cycles, |
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Abstract |
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Programme |
414;903;904;1011 |
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Address |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Publisher |
AGU |
Place of Publication |
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Editor |
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Summary Language |
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Series Editor |
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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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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2180 |
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Author |
Smirnov A, Holben B N, Slutsker I, Giles D M, McClain C R, Eck T F, Sakerin S M, Macke A, Croot P, Zibordi G, Quinn P K, Sciare J, Kinne S, Harvey M, Smyth T J, Piketh S, Zielinski T, Proshutinsky A, Goes J I, Nelson N B, Larouche P, Radionov V F, Goloub P, Krishna Moorthy K, Matarrese R, Robertson E J, Jourdin F, |
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Title |
Maritime Aerosol Network as a component of Aerosol Robotic Network
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Type |
Journal Article |
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Year |
2009 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
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Volume |
114 |
Issue |
D6 |
Pages |
D06204 - |
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Keywords |
aerosol optical depth, maritime aerosol, network, 0305 Atmospheric Composition and Structure: Aerosols and particles, 0360 Atmospheric Composition and Structure: Radiation: transmission and scattering, 1640 Global Change: Remote sensing, 4548 Oceanography: Physical: Ocean fog, 4801 Oceanography: Biological and Chemical: Aerosols, |
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Abstract |
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Programme |
415 |
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Corporate Author |
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Thesis |
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Publisher |
AGU |
Place of Publication |
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Summary Language |
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Series Editor |
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Series Title |
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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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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2198 |
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| Permanent link to this record |
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Author |
Gusmeroli Alessio, Pettit Erin C, Kennedy Joseph H, Ritz Catherine, |
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Title |
The crystal fabric of ice from full-waveform borehole sonic logging
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Type |
Journal Article |
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Year |
2012 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
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Volume |
117 |
Issue |
F3 |
Pages |
F03021- |
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Keywords |
Ice anisotropy, borehole sonic logging, ice crystal fabric, 0726 Cryosphere: Ice sheets, 0915 Exploration Geophysics: Downhole methods, 0935 Exploration Geophysics: Seismic methods (3025, 7294), |
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Abstract |
In an ice sheet, a preferred crystal orientation fabric affects deformation rates because ice crystals are strongly anisotropic: shear along the basal plane is significantly easier than shear perpendicular to the basal plane. The effect of fabric can be as important as temperature in defining deformation rates. Fabric is typically measured using analysis of thin sections under the microscope with co-polarized light. Due to the time-consuming and destructive nature of these measurements, however, it is difficult to capture the spatial variation in fabric necessary for evincing ice sheet flow patterns. Because an ice crystal is similarly elastically anisotropic, the speed of elastic waves through ice can be used as a proxy for quantify anisotropy. We use borehole sonic logging measurements and thin section data from Dome C, East Antarctica to define the relations between apparent fabric and borehole measured elastic speeds (compressional VP and vertically polarized shear VSV). These relations, valid for single maximum fabrics, allow in-situ, depth-continuous fabric estimates of unimodal fabric strength from borehole sonic logging. We describe the single maximum fabric using a1: the largest eigenvalue of the second-order orientation tensor. For ice at -16C and a1 in the 0.7-1 range the relations are VP = 248 a13.7 + 3755 m s-1 and VSV = -210a17.3 + 1968 m s-1.
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Programme |
902 |
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Publisher |
AGU |
Place of Publication |
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Summary Language |
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Series Editor |
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Series Issue |
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ISSN |
0148-0227 |
ISBN |
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Area |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
505 |
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Author |
Steen-Larsen H C, Masson-Delmotte V, Sjolte J, Johnsen S J, Vinther B M, Bron F-M, Clausen H B, Dahl-Jensen D, Falourd S, Fettweis X, Galle H, Jouzel J, Kageyama M, Lerche H, Minster B, Picard G, Punge H J, Risi C, Salas D, Schwander J, Steffen K, Sveinbjrnsdttir A E, Svensson A, White J, |
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Title |
Understanding the climatic signal in the water stable isotope records from the NEEM shallow firn/ice cores in northwest Greenland
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Type |
Journal Article |
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Year |
2011 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geol. |
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Volume |
116 |
Issue |
D6 |
Pages |
D06108 - |
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Keywords |
NEEM, ice cores, Greenland, 3305 Atmospheric Processes: Climate change and variability, 0724 Cryosphere: Ice cores, 3307 Atmospheric Processes: Boundary layer processes, 1863 Hydrology: Snow and ice, 3344 Atmospheric Processes: Paleoclimatology, |
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Abstract |
Samples of precipitation and atmospheric water vapor were collected together with shallow firn/ice cores as part of the new deep drilling project in northwest Greenland: the NEEM project. These samples were analyzed for their isotope composition to understand the processes affecting the climatic signal archived in the water stable isotope records from the NEEM deep ice core. The dominant moisture source for the snow deposited at the NEEM-site may be originating as far south as 35N from the western part of the Atlantic Ocean. The surface atmospheric water vapor appears in isotopic equilibrium with the snow surface indicating a large water exchange between the atmosphere and snowpack. The interannual variability of NEEM shallow firn/ice cores stable isotope data covering the last ~40 years shows an unexpectedly weak NAO signal. Regional to global atmospheric models simulate a dominant summer precipitation in the NEEM area, suggesting that the intermittency of modern winter precipitation is responsible for the lack of a strong NAO imprint. The interannual variability of NEEM isotope data however shows a strong correlation with interannual variations of Baffin Bay sea ice cover, a relationship consistent with air mass trajectories. NEEM deep ice core isotopic records may therefore provide detailed information on past Baffin Bay sea ice extent. NEEM stable water isotope content increasing trend points to a local warming trend of ~3.0C over the last 40 years.
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Programme |
458 |
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Publisher |
AGU |
Place of Publication |
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Edition |
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ISSN |
0148-0227 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2496 |
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| Permanent link to this record |
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Author |
Massom Robert A, Giles A Barry, Fricker Helen A, Warner Roland C, Legrsy Benoit, Hyland Glenn, Young Neal, Fraser Alexander D, |
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Title |
Examining the interaction between multi-year landfast sea ice and the Mertz Glacier Tongue, East Antarctica: Another factor in ice sheet stability?
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Type |
Journal Article |
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Year |
2010 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
115 |
Issue |
C12 |
Pages |
C12027 - |
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Keywords |
fast ice, ice sheet, interaction, 0776 Cryosphere: Glaciology, 0750 Cryosphere: Sea ice, 0728 Cryosphere: Ice shelves, 0732 Cryosphere: Icebergs, |
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Abstract |
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Programme |
1050 |
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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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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2684 |
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| Permanent link to this record |
