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Title |
Identifying global seismic anisotropy patterns by correlating shear-wave splitting and surface-wave data
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Type |
Journal Article |
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Year |
2009 |
Publication |
Physics of the Earth and Planetary Interiors |
Abbreviated Journal |
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Volume |
176 |
Issue |
34 |
Pages |
198-212 |
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Keywords |
Anisotropy, Surface waves, Splitting, Upper mantle, |
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Abstract  |
We compare a global compilation of shear-wave splitting measurements with azimuthal seismic anisotropy parameters inferred from surface-wave tomography. The currently available splitting dataset is taken from a novel comprehensive collection of available publications that is updated interactively online. The comparison between the two types of data is made by calculating predicted splitting parameters from the anisotropic tomography model. Comparing these predicted splitting parameters with the observed ones, we find a considerable correlation between the two datasets at global scale. This result is noteworthy, since such correlation did not seem to exist in previous studies. The spatial resolution associated with the two types of methods is rather different. While surface waves have good vertical resolution and poor lateral resolution of several hundreds of kilometers, SKS splitting measurements have good lateral, but poor vertical resolution. The correlation can be understood in light of recent propositions that anisotropy seen by SKS splitting constrains mostly the upper mantle, and therefore a similar depth region as surface waves. The correlation also confirms the generally good quality of the shear-wave measurements, as well as that of the anisotropic tomography model. |
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133 |
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ISSN |
0031-9201 |
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Approved |
yes |
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Call Number |
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Serial |
2906 |
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Author |
Mémin A., Flament T., Rémy F., Llubes M. |
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Title |
Snow- and ice-height change in Antarctica from satellite gravimetry and altimetry data |
Type |
Journal Article |
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Year |
2014 |
Publication |
Earth and Planetary Science Letters |
Abbreviated Journal |
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Volume |
404 |
Issue |
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Pages |
344-353 |
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Abstract |
We combine the surface-elevation and surface-mass change derived from Envisat data and GRACE solutions, respectively, to estimate regional changes in air and ice content of the surface of the Antarctic Ice Sheet (AIS) between January 2003 and October 2010. This leads, upon certain assumptions, to the separation of the rates of recent snow-accumulation change and that of ice-mass change. We obtain that the height of ice in Thwaites and Pine Island glaciers sectors decreases ( ≤ − 15.7 cm / yr ) while that in the Kamb glacier sector increases (≥5.3 cm/yr). The central part of the East AIS is mostly stable while the whole Dronning Maud Land coast is dominated by an increase in snow accumulation. The Kemp land regions show an ice-mass gain that accounts for 67–74% of the observed rates of elevation change in these regions. A good agreement is obtained over 68% of the investigated area, mostly in the East AIS, between our estimated rates of snow accumulation change and the predicted rates of the monthly surface mass balance derived from a regional atmospheric climate model. |
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337 |
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ISSN |
0012-821X |
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yes |
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Call Number |
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Serial |
6277 |
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Author |
David Ainley, Joellen Russell, Stephanie Jenouvrier, Eric Woehler, Philip O'B. Lyver, William R. Fraser, Gerald L. Kooyman |
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Journal |
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Year |
2010 |
Publication |
Ecological Monographs |
Abbreviated Journal |
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Volume |
80 |
Issue |
1 |
Pages |
49-66 |
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Programme |
109 |
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ISSN |
1557-7015 |
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yes |
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Call Number |
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Serial |
5693 |
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Title |
Regional modeling of surface mass balance on the Cook Ice Cap, Kerguelen Islands (49?S, 69?E) |
Type |
Journal |
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Year |
2019 |
Publication |
Climate Dynamics |
Abbreviated Journal |
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Volume |
53 |
Issue |
9 |
Pages |
5909-5925 |
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Abstract |
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Programme |
1048 |
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ISSN |
1432-0894 |
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yes |
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Call Number |
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Serial |
8185 |
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Title |
The emperor penguin – Vulnerable to projected rates of warming and sea ice loss |
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Journal |
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Year |
2020 |
Publication |
Biological Conservation |
Abbreviated Journal |
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Volume |
241 |
Issue |
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Pages |
108216 |
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Keywords |
Antarctic Climate change Conservation IUCN Red List threat status Protection |
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Abstract |
We argue the need to improve climate change forecasting for ecology, and importantly, how to relate long-term projections to conservation. As an example, we discuss the need for effective management of one species, the emperor penguin, Aptenodytes forsteri. This species is unique amongst birds in that its breeding habit is critically dependent upon seasonal fast ice. Here, we review its vulnerability to ongoing and projected climate change, given that sea ice is susceptible to changes in winds and temperatures. We consider published projections of future emperor penguin population status in response to changing environments. Furthermore, we evaluate the current IUCN Red List status for the species, and recommend that its status be changed to Vulnerable, based on different modelling projections of population decrease of ?50% over the current century, and the specific traits of the species. We conclude that current conservation measures are inadequate to protect the species under future projected scenarios. Only a reduction in anthropogenic greenhouse gas emissions will reduce threats to the emperor penguin from altered wind regimes, rising temperatures and melting sea ice; until such time, other conservation actions are necessary, including increased spatial protection at breeding sites and foraging locations. The designation of large-scale marine spatial protection across its range would benefit the species, particularly in areas that have a high probability of becoming future climate change refugia. We also recommend that the emperor penguin is listed by the Antarctic Treaty as an Antarctic Specially Protected Species, with development of a species Action Plan. |
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Programme |
137,394 |
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Thesis |
Bachelor's thesis |
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ISSN |
0006-3207 |
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Approved |
yes |
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Call Number |
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Serial |
7678 |
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Author |
Lebedev Sergei, Van Der Hilst Rob D, |
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Title |
Global upper-mantle tomography with the automated multimode inversion of surface and S-wave forms
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Type |
Journal Article |
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Year |
2008 |
Publication |
Geophysical Journal International |
Abbreviated Journal |
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Volume |
173 |
Issue |
2 |
Pages |
505-518 |
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Keywords |
Inverse theory, Numerical approximations and analysis, Mantle processes, Seismic tomography, Cratons, Dynamics of lithosphere and mantle, |
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Abstract |
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Programme |
133 |
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Publisher |
Blackwell Publishing Ltd |
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ISSN |
1365-246X |
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Approved |
yes |
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Call Number |
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Serial |
2811 |
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Author |
J. Jumelet, A. R. Klekociuk, S. P. Alexander, S. Bekki, A. Hauchecorne, J. P. Vernier, M. Fromm, P. Keckhut |
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Title |
Detection of Aerosols in Antarctica From Long-Range Transport of the 2009 Australian Wildfires |
Type |
Journal |
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Year |
2020 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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Volume |
125 |
Issue |
23 |
Pages |
e2020JD032542 |
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Keywords |
aerosols Antarctica bushfires lidar |
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Abstract |
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Programme |
209 |
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ISSN |
2169-8996 |
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yes |
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Serial |
8015 |
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Author |
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Title |
Antarctic Ozone Enhancement During the 2019 Sudden Stratospheric Warming Event |
Type |
Journal |
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Year |
2020 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
47 |
Issue |
14 |
Pages |
e2020GL087810 |
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Abstract |
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Programme |
209 |
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ISSN |
1944-8007 |
ISBN |
1944-8007 |
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yes |
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Call Number |
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Serial |
6954 |
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Title |
Evidence of unfrozen liquids and seismic anisotropy at the base of the polar ice sheets
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Type |
Journal Article |
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Year |
2015 |
Publication |
Polar Science |
Abbreviated Journal |
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Volume |
9 |
Issue |
1 |
Pages |
66-79 |
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Keywords |
Polar ice, Seismic anisotropy, Unfrozen liquids, |
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133 |
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ISSN |
18739652 |
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yes |
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Call Number |
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Serial |
6151 |
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Author |
Afsaneh Mohammadzaheri, Karin Sigloch, Kasra Hosseini, Mitchell G. Mihalynuk |
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Title |
Subducted Lithosphere Under South America From Multifrequency P Wave Tomography |
Type |
Journal |
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Year |
2021 |
Publication |
Journal of Geophysical Research: Solid Earth |
Abbreviated Journal |
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Volume |
126 |
Issue |
6 |
Pages |
e2020JB020704 |
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Keywords |
Andes intra-arc intra-oceanic subduction seismic tomography South America structure of the mantel |
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Abstract |
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Programme |
133 |
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ISSN |
2169-9356 |
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yes |
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Call Number |
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Serial |
7991 |
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