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Journal |
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Year  |
2022 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
697 |
Issue |
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Pages |
149-165 |
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Keywords |
Activity pattern At-sea distribution Bill width Geolocation GPS Pachyptila macgillivrayi Seabirds Southern Indian Ocean Trophic position |
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109,394 |
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Bachelor's thesis |
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ISSN |
0171-8630, 1616-1599 |
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yes |
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Call Number |
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Serial |
8564 |
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Title |
Contrasting bottom-up effects of warming ocean on two king penguin populations |
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Journal |
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Year |
2022 |
Publication |
Global Change Biology |
Abbreviated Journal |
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Volume |
29 |
Issue |
4 |
Pages |
998-1008 |
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Keywords |
breeding success climate change king penguin marine ecosystem ocean temperature Southern Ocean |
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394 |
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ISSN |
1365-2486 |
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Approved |
yes |
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Call Number |
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Serial |
8566 |
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Author |
Yves Cherel, Karine Delord, Christophe Barbraud, Henri Weimerskirch |
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Title |
Diet, isotopic niche, and spatial distribution of the white-headed petrel (Pterodroma lessonii) at Kerguelen Islands |
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Journal |
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Year |
2022 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
45 |
Issue |
11 |
Pages |
1607-1621 |
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Keywords |
Fish Food Myctophidae Procellariiformes Seabirds Southern ocean Squid |
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Abstract |
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Programme |
109 |
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ISSN |
1432-2056 |
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yes |
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Serial |
8567 |
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Author |
V. Haberle, A. Marchaudon, A. Chambodut, P.-L. Blelly |
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Title |
Direct Determination of Geomagnetic Baselines During Quiet Periods for Low- and Mid-Latitude Observatories |
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Journal |
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Year |
2022 |
Publication |
Journal of Geophysical Research: Space Physics |
Abbreviated Journal |
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Volume |
127 |
Issue |
8 |
Pages |
e2022JA030407 |
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Keywords |
magnetic baseline magnetic observatory data quiet geomagnetic field Sq current |
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Abstract |
The geomagnetic field is composed of a variety of sources that act on a wide range of timescales and amplitudes. The separation of magnetic storm effects from quiet variations is needed to accurately quantify impacts of space weather events. The extraction of such quiet contributions within geomagnetic measurements is achieved by the determination of baselines, which, ideally, is done by a simple algorithm which captures quiet sources suitably well, while being applicable to an extensive network of magnetic observatories independent of the period of time. In this work, we apply signal filtering techniques on the horizontal components of geomagnetic field measurements from low- and mid-latitude observatories to determine baselines. The variations within the baseline are investigated for magnetically quiet periods between 1991 and 2019, focusing on long-term trends, seasonal and local time dependencies, and day-to-day variability. The analysis confirms that the contributing quiet sources include the secular variation and the solar quiet (Sq) current system. The non-negligible day-to-day variability, that is typical for Sq in low- and mid-latitudes, is embedded within the baseline. Thus, the filter approach extracts quiet magnetic field variations well. Comparisons with other baseline methods show good agreements. We conclude that the filter approach can be used to determine baselines automatically during magnetically quiet periods without the need of further apriori information and is applicable on a wide network of magnetic observatories. It marks the first step for deriving magnetic indices for (near) real-time space weather applications. |
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139 |
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ISSN |
2169-9402 |
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yes |
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Call Number |
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Serial |
8568 |
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Title |
Every hooked beak is maintained by a prey: Ecological signal in cephalopod beak shape |
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Journal |
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Year |
2022 |
Publication |
Functional Ecology |
Abbreviated Journal |
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Volume |
36 |
Issue |
8 |
Pages |
2015-2028 |
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Keywords |
3D geometric morphometrics beak cephalopod ecology phylogenetic signal |
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Abstract |
Beaks are among the few hard parts of coleoid cephalopods and are informative for species identification. Although mandible shape has been shown to be adaptive in many vertebrate taxa, it has been suggested that the shape of coleoid beaks does not bear any ecological signal. Yet, previous studies only explored beak shape in 2D and none have provided an in-depth investigation of the potential relationship with ecological variables such as habitat use or diet. The goal of the present study was to understand whether variation in cephalopod beak shape reflects ecology and/or is more driven by phylogenetic relatedness as suggested previously. We imaged 101 lower and 108 upper beaks in 3D using underwater photogrammetry and micro-CT scanning. Our 3D morphometric analysis conducted on 75 species of cephalopod shows that there is a significant but moderate phylogenetic signal. However, comparative phylogenetically informed analyses demonstrate that beak shape is also driven by ecology. We detected significant differences in beak shape between species inhabiting different habitats (pelagic, benthic or demersal) and of different trophic levels. Our results further suggest that beak shape variation can be summarized along a continuum between two main functions: fast closing versus hard biting. These results provide novel insights into the drivers of beak shape diversity in coleoid cephalopods and suggest that beak shape has evolved adaptively in relation to diet and habitat use. Read the free Plain Language Summary for this article on the Journal blog. |
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Programme |
109 |
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Edition |
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ISSN |
1365-2435 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8569 |
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Author |
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Title |
Fisheries bycatch mitigation measures as an efficient tool for the conservation of seabird populations |
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Journal |
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Year |
2022 |
Publication |
Journal of Applied Ecology |
Abbreviated Journal |
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Volume |
59 |
Issue |
7 |
Pages |
1674-1685 |
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Programme |
109 |
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ISSN |
1365-2664 |
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yes |
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Call Number |
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Serial |
8570 |
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Author |
Ivan D. Haigh, Marta Marcos, Stefan A. Talke, Philip L. Woodworth, John R. Hunter, Ben S. Hague, Arne Arns, Elizabeth Bradshaw, Philip Thompson |
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Title |
GESLA Version 3: A major update to the global higher-frequency sea-level dataset |
Type |
Journal |
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Year |
2022 |
Publication |
Geoscience Data Journal |
Abbreviated Journal |
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Volume |
10 |
Issue |
3 |
Pages |
293-314 |
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Keywords |
sea level records sea level rise storm surges storm tides tide gauge |
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Abstract |
This paper describes a major update to the quasi-global, higher-frequency sea-level dataset known as GESLA (Global Extreme Sea Level Analysis). Versions 1 (released 2009) and 2 (released 2016) of the dataset have been used in many published studies, across a wide range of oceanographic and coastal engineering-related investigations concerned with evaluating tides, storm surges, extreme sea levels, and other related processes. The third version of the dataset (released 2021), presented here, contains double the number of years of data, and nearly four times the number of records, compared to Version 2. The dataset consists of records obtained from multiple sources around the world. This paper describes the assembly of the dataset, its processing, and its format, and outlines potential future improvements. |
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688 |
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ISSN |
2049-6060 |
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yes |
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Serial |
8571 |
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Author |
Kristin N. Barton, Nairita Pal, Steven R. Brus, Mark R. Petersen, Brian K. Arbic, Darren Engwirda, Andrew F. Roberts, Joannes J. Westerink, Damrongsak Wirasaet, Michael Schindelegger |
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Title |
Global Barotropic Tide Modeling Using Inline Self-Attraction and Loading in MPAS-Ocean |
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Year |
2022 |
Publication |
Journal of Advances in Modeling Earth Systems |
Abbreviated Journal |
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Volume |
14 |
Issue |
11 |
Pages |
e2022MS003207 |
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Keywords |
barotropic tides E3SM MPAS-Ocean numerical ocean modeling self-attraction and loading surface tides |
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Abstract |
We examine ocean tides in the barotropic version of the Model for Prediction Across Scales (MPAS-Ocean), the ocean component of the Department of Energy Earth system model. We focus on four factors that affect tidal accuracy: self-attraction and loading (SAL), model resolution, details of the underlying bathymetry, and parameterized topographic wave drag. The SAL term accounts for the tidal loading of Earth's crust and the self-gravitation of the ocean and the load-deformed Earth. A common method for calculating SAL is to decompose mass anomalies into their spherical harmonic constituents. Here, we compare a scalar SAL approximation versus an inline SAL using a fast spherical harmonic transform package. Wave drag accounts for energy lost by breaking internal tides that are produced by barotropic tidal flow over topographic features. We compare a series of successively finer quasi-uniform resolution meshes (62.9, 31.5, 15.7, and 7.87 km) to a variable resolution (45 to 5 km) configuration. We ran MPAS-Ocean in a single-layer barotropic mode forced by five tidal constituents. The 45 to 5 km variable resolution mesh obtained the best total root-mean-square error (5.4 cm) for the deep ocean (1,000 m) tide compared to TPXO8 and ran twice as fast as the quasi-uniform 8 km mesh, which had an error of 5.8 cm. This error is comparable to those found in other forward (non-assimilative) ocean tide models. In future work, we plan to use MPAS-Ocean to study tidal interactions with other Earth system components, and the tidal response to climate change. |
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688 |
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ISSN |
1942-2466 |
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yes |
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Call Number |
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Serial |
8572 |
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Author |
Lucas Sawade, Stephen Beller, Wenjie Lei, Jeroen Tromp |
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Title |
Global centroid moment tensor solutions in a heterogeneous earth: the CMT3D catalogue |
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Year |
2022 |
Publication |
Geophysical Journal International |
Abbreviated Journal |
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Volume |
231 |
Issue |
3 |
Pages |
1727-1738 |
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133 |
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ISSN |
0956-540X |
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yes |
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8573 |
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Title |
Images of the East African Rift System by Global Adaptive-Resolution Surface-Wave Tomography |
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Journal |
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Year |
2022 |
Publication |
Journal of Geophysical Research: Solid Earth |
Abbreviated Journal |
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Volume |
127 |
Issue |
6 |
Pages |
e2021JB023570 |
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Keywords |
East African Rift System surface-wave velocity model |
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Abstract |
In this study we map the entire East African Rift System (EARS) within a global surface-wave velocity model to better constrain the structure of the underlying mantle, as well as patterns that might be associated with its continuation in the Mozambique Channel. We use all publicly available seismograms from the African continent, amounting to 1296 stations and more than 30 years of recordings. From these data, we obtain dispersion curves using both ambient noise and teleseismic earthquakes. To our measurements, we add global counterparts and jointly invert them for phase-velocity maps. We exploit a linearized inversion based on the ray theory, with an adaptive parameterization that allows for maximizing the resolution of the final maps based on the density of data coverage. We thus image the main African cratons and also some of the Archean blocks within them. We highlight the discontinuous nature of magmatic activity along the EARS and also display low-velocity anomalies beneath the Comores Archipelago, Madagascar and Bassas da India volcanic islands and seamounts. This last low-velocity anomaly is in the direct continuation of the EARS and could unveil an important magmatic system in the Mozambique Channel. |
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133 |
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2169-9356 |
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yes |
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Call Number |
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Serial |
8574 |
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