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Author  |
Tranchant Y.-T. |
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2022 |
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688 |
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yes |
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8352 |
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Author |
Trampert, J.; Snieder, R. |
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Title |
Model Estimations Biased by Truncated Expansions: Possible Artifacts in Seismic Tomography |
Type |
Journal Article |
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Year |
1996 |
Publication |
Science |
Abbreviated Journal |
Science |
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Volume |
271 |
Issue |
5253 |
Pages |
1257-1260 |
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Keywords |
seismology ; tomography ; errors ; mathematical models ; methods ; inverse problem ; elastic waves ; Rayleigh waves ; algorithms |
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Abstract |
In most linear imaging problems, where the model to be sought is expanded in a set of basis functions, it is common practice to truncate the set at a certain (arbitrary) level. The solution then depends on the chosen parameterization, and neglected basis functions may leak into the solution to produce artifacts in the retrieved model. An unbiased estimate of the coefficients of the true model may be obtained in the chosen finite basis set ; here, a method to suppress leakage is illustrated on an example of global seismic tomography. |
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133 |
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0036-8075 |
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Notes |
10.1126/science.271.5253.1257 |
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yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5615 |
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Author |
Trampert J. & Woodhouse J.H. |
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Title |
High resolution global phase velocity distributions. |
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Journal Article |
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Year |
1996 |
Publication |
Geophysical research letters |
Abbreviated Journal |
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Volume |
23 |
Issue |
1 |
Pages |
21-24 |
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133 |
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0094-8276 |
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yes |
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636 |
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Author |
Trampert J. & Woodhouse J.H. |
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Title |
Global phase velocity maps of Love and Rayleigh waves between 40 and 150 seconds. |
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Journal Article |
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Year |
1995 |
Publication |
Geophysical journal international |
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122 |
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Pages |
675-690 |
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133 |
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ISSN |
0956-540X |
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yes |
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765 |
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Title |
Repeatability of alert and flight initiation distances in king penguins: Effects of colony, approach speed, and weather |
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Journal |
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Year |
2022 |
Publication |
Ethology |
Abbreviated Journal |
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Volume |
128 |
Issue |
4 |
Pages |
303-316 |
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Keywords |
Aptenodytes patagonicus human disturbance optimal escape decisions personality predation risk |
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Abstract |
Alert distance (AD) and flight initiation distance (FID) are popular measures used to explore the reaction of prey to approaching predators, and thus the economics underlying optimal escape strategies. AD likely mirrors the effort invested into vigilance, while FID provides an estimate of the perceived risk of an approaching threat. Although individual variation in AD and FID is influenced by environmental factors such as variation in predation pressure and human disturbance, the repeatabilities of these traits (especially AD), and therefore their designation as personality traits, remain under-investigated. Here, we studied the repeatability of AD, FID, and the decision to flee in a flightless, ground-breeding seabird, the king penguin (Aptenodytes patagonicus). A single experimenter approached three times over three consecutive days 47 incubating king penguins from two different colonies with varying human disturbance levels. We explored the effects of weather, time of day, and approach speed of the experimenter on these behaviors. Weather had an effect on all three behaviors. In warm, sunny weather AD increased. In rainy, windy weather birds were more likely to flee, but waited longer before initiating flight. Faster approach speeds between AD and FID increased FID. Weather conditions and speed of approach affected repeatability estimates, highlighting the need to consider external sources of variation when refining such estimates. FID and the decision to flee were significantly and moderately repeatable (r = 0.26 and 0.57, respectively), while AD was not. There was no evidence of behavioral habituation or sensitization in either colony. |
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119 |
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1439-0310 |
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yes |
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Call Number |
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Serial |
8402 |
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Journal |
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Year |
2023 |
Publication |
Behavioural Processes |
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Volume |
210 |
Issue |
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Pages |
104919 |
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Keywords |
Antipredator behaviour Escape flight distance Optimal escape decisions Predation risk Predator-prey decision Risk taking |
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119 |
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0376-6357 |
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yes |
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Call Number |
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Serial |
8678 |
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Author |
Tourpin S. & Giret A. |
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Title |
Zeolitisation and Ree Basalt Contents in the Kerguelen Islands. |
Type |
Conference - International - Article without Reading Comitee |
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Year |
1998 |
Publication |
Progress in Kerguelen Islands Geology |
Abbreviated Journal |
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43-44 |
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Abstract |
Workshop 'Progress in Kerguelen Islands Geology' |
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Programme |
251 |
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yes |
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2126 |
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Title |
Antarctic icebergs distributions, 20022010
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Journal Article |
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Year |
2012 |
Publication |
Journal of Geophysical Research: Oceans |
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Volume |
117 |
Issue |
C5 |
Pages |
C05004- |
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Keywords |
altimetry, climatology, freshwater, icebergs, 0732 Icebergs, 0758 Remote sensing, |
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Abstract |
Interest for icebergs and their possible impact on southern ocean circulation and biology has increased during the recent years. While large tabular icebergs are routinely tracked and monitored using scatterometer data, the distribution of smaller icebergs (less than some km) is still largely unknown as they are difficult to detect operationally using conventional satellite data. In a recent study, Tournadre et al. (2008) showed that small icebergs can be detected, at least in open water, using high resolution (20 Hz) altimeter waveforms. In the present paper, we present an improvement of their method that allows, assuming a constant iceberg freeboard elevation and constant ice backscatter coefficient, to estimate the top-down iceberg surface area and therefore the distribution of the volume of ice on a monthly basis. The complete Jason-1 reprocessed (version C) archive covering the 20022010 period has been processed using this method. The small iceberg data base for the southern ocean gives an unprecedented description of the small iceberg (100 m2800 m) distribution at unprecedented time and space resolutions. The iceberg size, which follows a lognormal distribution with an overall mean length of 630 m, has a strong seasonal cycle reflecting the melting of icebergs during the austral summer estimated at 1.5 m/day. The total volume of ice in the southern ocean has an annual mean value of about 400 Gt, i.e., about 35% of the mean yearly volume of large tabular icebergs estimated from the National Ice Center database of 19792003 iceberg tracks and a model of iceberg thermodynamics. They can thus play a significant role in the injection of meltwater in the ocean. The distribution of ice volume which has strong seasonal cycle presents a very high spatial and temporal variability which is much contrasted in the three ocean basins (South Atlantic, Indian and Pacific oceans). The analysis of the relationship between small and large (>5 km) icebergs shows that a majority of small icebergs are directly associated with the large ones but that there are vast regions, such as the eastern branch of the Wedell Gyre, where the transport of ice is made only through the smaller ones.
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1050 |
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ISSN |
2156-2202 |
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yes |
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Serial |
4145 |
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Author |
Toullec JY, Hourdez S., Lallier F.H. et Jollivet D. |
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Journal Article |
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Year |
2012 |
Publication |
BIOFUTUR |
Abbreviated Journal |
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336 |
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40-43 |
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1039 |
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0294-3506 |
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yes |
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Serial |
4295 |
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Author |
Toullec JY, Clark M, Kawaguchi S,Tanguy A. & Jollivet D. |
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Title |
Krill responses to environmental temperature variations |
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Conference - International - Poster |
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Year |
2011 |
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Communication at the Krill in Changing Ocean WOrkshop: Texel May 2011 |
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1039 |
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yes |
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Call Number |
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3731 |
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