| Records |
| Author |
Samuel Veilleux, Najat Bhiry, Armelle Decaulne |
| Title |
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Type |
Journal |
| Year |
2020 |
Publication |
Geomorphology |
Abbreviated Journal |
|
| Volume |
349 |
Issue |
|
Pages |
106911 |
Keywords  |
Morphometry Nunavik Periglacial Slope dynamics Snow avalanches |
| Abstract |
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| Programme |
1148 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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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 |
0169-555X |
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 |
8261 |
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| Author |
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| Title |
Sex identification in King Penguins Aptenodytes patagonicus through morphological and acoustic cues |
Type |
Journal |
| Year |
2018 |
Publication |
Ibis |
Abbreviated Journal |
|
| Volume |
160 |
Issue |
4 |
Pages |
755-768 |
| Keywords |
morphology penguins seabird sexing methods sexual selection vocal sex recognition |
| Abstract |
In the context of sexual selection, animals have developed a variety of cues conveying information about the sex of an individual to conspecifics. In many colonial seabird species, where females and males are monomorphic and do not show obvious differences in external morphology, acoustic cues are an important signal for individual and sex recognition. Here, we study the vocal and morphological sex dimorphism in the King Penguin Aptenodytes patagonicus, a colonial, monomorphic seabird for which our knowledge about the role of vocalizations and morphology in mate choice is very limited. Data were collected at Possession Island, Crozet Archipelago, in a breeding colony consisting of about 16 000 breeding pairs. Using measurements of six morphological features and analysing acoustic parameters of call recordings of adult individuals, we show that King Penguins can be sexed based on a single morphological measurement of the beak with an accuracy of 79%. We found a sex-specific syntax in adult King Penguin calls that provided a 100% accurate method to distinguish between the sexes in our study population. To confirm the method at the species level, we analysed calls recorded from King Penguin adults in Kerguelen Island, 1300 km away from our study population and found the same accuracy of the sex-specific syntax. This sex-specific syllable arrangement is rare in non-passerines and is a first step in understanding the mate choice process in this species. Furthermore, it offers a cost-effective, non-invasive technique for researchers to sex King Penguins in the field. |
| Programme |
137,354 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
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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 |
1474-919X |
ISBN |
1474-919X |
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 |
7100 |
| Permanent link to this record |
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| Author |
Reymond D, Crusem R, Barriot J P, |
| Title |
Empirical approaches for fast robust inversion of seismic moment tensor from surface waves
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Type |
Journal Article |
| Year |
2010 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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| Volume |
37 |
Issue |
7 |
Pages |
L07307- |
| Keywords |
moment tensor, robust inversion, IRLS, 3260 Inverse theory, 7255 Surface waves and free oscillations, 7215 Earthquake source observations, |
| Abstract |
We present a method of robust inversion (also called IRLS: Iterative Reweighted Least Squares) which is surprisingly insensitive to outlier data points, as it discards automatically the aberrant points, without the necessity for careful human inspection and control of data quality. Different criteria based on residuals and signal-to-noise ratio are injected into the covariance matrix (acting like a weighting function), to perform the robust inversion using the iterative generalized discrete inverse method of Tarantola-Valette. From a practical point of view, this algorithm is used as the Preliminary Determination of Focal Mechanism (PDFM) method, which is a project for rapid estimation of source parameters of strong earthquakes in the context of tsunami warning. The input data to be inverted are spectra of long period surface waves, and as an output, the computed result is the seismic moment tensor, from which focal geometry of an earthquake, and principal stress axes are obtained. This method can be applied to any other method of non-linear (iterative) inversions confronted to the problem of outlier points polluting the data sets.
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| Programme |
133 |
| Campaign |
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Thesis |
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Place of Publication |
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Original Title |
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Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
1944-8007 |
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 |
403 |
| Permanent link to this record |
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| |
| Author |
Dufumier H. |
| Title |
On the limits of moment tensor inversions of teleseismic body wave spectra. |
Type |
Journal Article |
| Year |
1996 |
Publication |
Pure and applied geophysics |
Abbreviated Journal |
|
| Volume |
147 |
Issue |
3 |
Pages |
467-482 |
| Keywords |
Moment tensor, inversion, body waves, conditioning, resolution, information, single-station |
| Abstract |
The limits of linear moment-tensor inversions from long-period teleseismic body waves are analysed in detail, using inverse methods. We focus our attention on single-station and few-stations methods. Information on the feasibility of full or deviatoric moment-tensor determinations prior to inversion are deduced from the system conditioning. The resolution and correlation of the momenttensor components are analysed using the resolution matrix. Conclusions on the importance and independence of the data are drawn from the information matrix. The single--station case and its implications are discussed in greater detail, as well as possible constraints on the inversion. |
| Programme |
133 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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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 |
0033-4553 |
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 |
262 |
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| Author |
Vignati E, Facchini MC, Rinaldi M, Scannell C, Ceburnis D, Sciare J, Kanakidou M, Myriokefalitakis S, Dentener F, O'Dowd CD, |
| Title |
Global scale emission and distribution of sea-spray aerosol: Sea-salt and organic enrichment
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Type |
Journal Article |
| Year |
2010 |
Publication |
Atmospheric Environment |
Abbreviated Journal |
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| Volume |
44 |
Issue |
5 |
Pages |
670 -677 |
| Keywords |
Modelling, Marine aerosols, Organics, Emissions, |
| Abstract |
The chemical composition of marine aerosols as a function of their size is an important parameter for the evaluation of their impact on the global climate system. In this work we model fine particle organic matter emitted by sea spray processes and its influence on the aerosol chemical properties at the global scale using the off-line global Chemistry-Transport Model TM5. TM5 is coupled to a microphysical aerosol dynamics model providing size resolved information on particle masses and numbers. The mass of the emitted sea spray particles is partitioned between water insoluble organic matter (WIOM) and sea salt components in the accumulation mode using a function that relates the emitted organic fraction to the surface ocean chlorophyll-a concentrations. The global emission in the submicron size range of organic matter by sea spray process is 8.2 Tg yr-1, compared to 24 Tg yr-1 sea-salt emissions. When the marine sources are included, the concentrations of modeled primary particulate organic matter (POM) increase mainly over the oceans. The model predictions of WIOM and sea salt are evaluated against measurements carried out at Mace Head (Northern Hemisphere) and Amsterdam Island (Southern Hemisphere), showing that in clean marine conditions WIOM marine emissions contribute significantly to POM values. An estimation of the sea spray organic source in the coarse mode is carried out on the basis of field observations as well as laboratory experiments: the mass of sea spray organic matter in the coarse size range is ca 52% of the total primary organic fraction, leading to a total marine POM emission of 17.2 Tg yr-1. |
| Programme |
415 |
| Campaign |
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| Address |
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Thesis |
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| Publisher |
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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 |
1352-2310 |
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 |
68 |
| Permanent link to this record |
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| Author |
Legagneux, L.; Domine, F. |
| Title |
A mean field model of the decrease of the specific surface area of dry snow during isothermal metamorphism |
Type |
Journal Article |
| Year |
2005 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
| Volume |
110 |
Issue |
|
Pages |
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| Keywords |
model; isothermal snow metamorphism; Ostwald ripening; 0736 Cryosphere: Snow; 3947 Mineral Physics: Surfaces and interfaces; 1847 Hydrology: Modeling; 5112 Physical Properties of Rocks: Microstructure |
| Abstract |
The surface area of snow that is accessible to gases is an essential parameter for quantifying the exchange of trace gases between the snowpack and the atmosphere and is called the specific surface area (SSA). Snow SSA decreases during metamorphism, but this is not described in current snow models owing to the complexity of the physics and geometry of snow. In this paper, we test whether it is possible to model snow SSA changes during isothermal metamorphism without accounting for all the complexity of the three-dimensional (3-D) structure of real snow. We have developed a mean field model of snow metamorphism under isothermal conditions, grounded in the theoretical framework of transient Ostwald ripening and representing snow as a distribution of spherical particles. Analytical expressions of the growth rates of these spheres are obtained, and the evolution of two measurable parameters that characterize snow geometry, the SSA and the distribution of radii of curvature (DRC), are simulated and compared to experimental data obtained by X-ray tomography. The qualitative effects of temperature, snow density, and the condensation coefficient on the rate of SSA decrease are examined. The model predicts very well the rate of evolution of the particle size distribution, which validates our physical description of isothermal metamorphism. In particular, we find that vapor phase diffusion is rate limiting. However, the calculation of the SSA from the DRC appears delicate and evidences too crude approximations in our description of the 3-D geometry of snow. Finally, it is stressed that the initial DRC can greatly influence the rate of SSA decrease, while experimental measurements of the rate of SSA decrease suggest that all snow types evolve in a similar way. It is thus proposed that most natural fresh snows have similar DRCs. |
| Programme |
437 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
American Geophysical Union |
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 |
IPEV @ Thierry.Lemaire @ |
Serial |
5650 |
| Permanent link to this record |
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| Author |
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| Title |
Temporal and spatial differences in the post-breeding behaviour of a ubiquitous Southern Hemisphere seabird, the common diving petrel |
Type |
Journal |
| Year |
2020 |
Publication |
Royal Society Open Science |
Abbreviated Journal |
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| Volume |
7 |
Issue |
11 |
Pages |
200670 |
| Keywords |
migration moult non-breeding Procellariiformes Southern Ocean stable isotopes |
| Abstract |
The non-breeding period plays a major role in seabird survival and population dynamics. However, our understanding of the migratory behaviour, moulting and feeding strategies of non-breeding seabirds is still very limited, especially for small-sized species. The present study investigated the post-breeding behaviour of three distant populations (Kerguelen Archipelago, southeastern Australia, New Zealand) of the common diving petrel (CDP) (Pelecanoides urinatrix), an abundant, widely distributed zooplanktivorous seabird breeding throughout the southern Atlantic, Indian and Pacific oceans. The timing, geographical destination and activity pattern of birds were quantified through geolocator deployments during the post-breeding migration, while moult pattern of body feathers was investigated using stable isotope analysis. Despite the high energetic cost of flapping flight, all the individuals quickly travelled long distances (greater than approx. 2500 km) after the end of the breeding season, targeting oceanic frontal systems. The three populations, however, clearly diverged spatially (migration pathways and destinations), and temporally (timing and duration) in their post-breeding movements, as well as in their period of moult. Philopatry to distantly separated breeding grounds, different breeding phenologies and distinct post-breeding destinations suggest that the CDP populations have a high potential for isolation, and hence, speciation. These results contribute to improving knowledge of ecological divergence and evolution between populations, and inform the challenges of conserving migratory species. |
| Programme |
394 |
| Campaign |
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Thesis |
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Place of Publication |
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Editor |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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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 |
8029 |
| Permanent link to this record |
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| Author |
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| Title |
The Microwave Snow Grain Size: A New Concept to Predict Satellite Observations Over Snow-Covered Regions |
Type |
Journal |
| Year |
2022 |
Publication |
AGU Advances |
Abbreviated Journal |
|
| Volume |
3 |
Issue |
4 |
Pages |
e2021AV000630 |
| Keywords |
microstructure microwave modeling porous media remote sensing snow |
| Abstract |
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| Programme |
1110,1177 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
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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 |
2576-604X |
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 |
8424 |
| Permanent link to this record |
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| Author |
Grob M, Maggi A, Stutzmann E, |
| Title |
Observations of the seasonality of the Antarctic microseismic signal, and its association to sea ice variability
|
Type |
Journal Article |
| Year |
2011 |
Publication |
Geophys. Res. Lett. |
Abbreviated Journal |
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| Volume |
38 |
Issue |
11 |
Pages |
L11302- |
| Keywords |
microseisms, sea, seismic noise, seismology, 0750 Cryosphere: Sea ice, 7299 Seismology: General or miscellaneous, 9310 Geographic Location: Antarctica, |
| Abstract |
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| Programme |
906 |
| 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 |
0094-8276 |
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 |
3292 |
| Permanent link to this record |
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| Author |
Grob M, Maggi A, Stutzmann E, |
| Title |
Observations of the seasonality of the Antarctic microseismic signal, and its association to sea ice variability
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Type |
Journal Article |
| Year |
2011 |
Publication |
Geophys. Res. Lett. |
Abbreviated Journal |
|
| Volume |
38 |
Issue |
11 |
Pages |
L11302- |
| Keywords |
microseisms, sea, seismic noise, seismology, 0750 Cryosphere: Sea ice, 7299 Seismology: General or miscellaneous, 9310 Geographic Location: Antarctica, |
| Abstract |
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| Programme |
133 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| 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 |
0094-8276 |
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 |
3795 |
| Permanent link to this record |
