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Ahadi F, Delpech G, Gautheron C, Nomade S, Pinna-jamme R, Ponthus L, Guillaume D |
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Morphological modifications of the Kerguelen Islands (South Indian Ocean) in response to Neogene climate change: evidence from 40Ar/39Ar and (U-Th)/He thermochronology. |
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Poster |
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2016 |
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Geophysical research abstracts vol.18, egu2016-12755 |
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7289 |
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Ahadi F, delpech G, Gautheron C, Nomade S, Zeyen H, Guillaume, D |
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Interpretation of thermochronological cooling ages using thermal modelling: an example from shallow magma intrusions from the Kerguelen archipelago. |
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2017 |
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Geophysical research abstracts vol.19, egu2017-13817 |
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7320 |
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Aidan D. Bindoff, Simon J. Wotherspoon, Christophe Guinet, Mark A. Hindell |
![find book details (via ISBN) isbn](img/isbn.gif)
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Title |
Twilight-free geolocation from noisy light data |
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2017 |
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Methods in Ecology and Evolution |
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9 |
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5 |
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1190-1198 |
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animal tracking archival tag bird migration global location sensor Hidden Markov Models |
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Solar geolocation is used to quantify the movements of animals tagged with sensors that record ambient light with respect to time. Global location sensor (GLS) tags are small, light, and present minimal drag or wing loading. They are affordable, and some can record data for several migratory cycles. These benefits mean they can be used in applications for which satellite tags are unsuitable. However, large errors in estimated locations can result if the sensor is obscured, especially around twilight, and sometimes the data obtained is unusable by existing methods of analysis due to this source of noise. This places limitations on the usefulness of solar geolocation in conservation and monitoring efforts. All existing methods of analysis are dependent on twilights being identifiable or faithfully recorded. Instead, the method introduced here depends on the overall pattern of day and night to calculate the likelihoods for a Hidden Markov Model, where the hidden states are geographic locations. We call this a “twilight-free” method of light-based geolocation. This method quickly estimates locations from otherwise unusable noisy light data. We use examples to show that the method produces tracks that are comparable in accuracy and precision to other geolocation methods. Furthermore, efficiency and replicability of estimated paths are improved because the user does not have to subjectively identify twilights. Other data sources, such as sea surface temperature and land or sea masks are easily incorporated, further improving location estimates and processing speed. The twilight-free method offers new opportunities to researchers interested in the movements of animals that routinely have obscured sensors, or to analyse previously unusable noisy light data. It offers a fast, efficient, and replicable method for analysing tag data without the need for time-consuming pre- or post-processing. By increasing the yield of usable data from GLS tagging studies, researchers can more efficiently quantify where animals are going and when, and monitor changes in habitat. This is of fundamental importance to management and conservation efforts. |
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2041-210X |
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2041-210X |
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yes |
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7314 |
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Aittaleb M., Hubner R., Lamotte Brasseur J. & Gerday C. |
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Cold adaptation parameters derived from CDNA sequencing and molecular modelling of elastase from Antarctic fish Notothenia neglecta. |
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1997 |
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Protein engeneering |
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Protein Eng. |
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10 |
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475-477 |
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165 |
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0269-2139 |
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yes |
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1232 |
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Akers P. |
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A new proxy of snow accumulation using 15N of nitrate |
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2018 |
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Post doc, CNRS/H2020 |
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yes |
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7875 |
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Akers P., Savarino, J., Caillon, N. |
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Title |
Reconstructing Antarctic snow accumulation using nitrogen isotopes of nitrate |
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Communication |
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2021 |
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EGU General Assembly, 19-30 April 2021 |
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yes |
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7866 |
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Åkesson S.; Weimerskirch H. |
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Title |
Albatross long-distance navigation: comparing adults and juveniles. |
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2005 |
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Journal of navigation |
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58 |
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3 |
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365-373 |
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Albatrosses are known for their extreme navigation performance enabling them to locate isolated breeding islands after long-distance migrations across open seas. Little is known about the migration of young albatrosses and how they reach the adults' navigation and foraging skills during the period of immaturity lasting several years and spent permanently flying across the open ocean. We tracked by satellite telemetry the dispersal and migration of 13 juvenile wandering albatrosses from the Crozet Islands during their first year at sea. The young albatrosses covered an average distance of 184,000 km during the first year, restricting their dispersal movement to the unproductive and low wind subtropical Indian Ocean and Tasman Sea. The juveniles initiated the migration by an innate phase of rapid dispersal encoded as a fixed flight direction assisted by southerly winds towards north and northeast. Thereafter each individual restricted its movement to a particular zone of the ocean that will possibly be used until they start breeding 7–10 years later and return in contact with breeding adults. This dispersal in young birds corresponds well with movements observed for adult non-breeding wandering albatrosses. The results show clearly an inherited ability to navigate back to already visited areas in young wandering albatrosses. The juvenile dispersal behaviour and migration at sea suggest a genetically based migration program, encoding navigation to a destination area used throughout the life. |
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109 |
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0373-4633 |
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yes |
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4588 |
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Åkesson Susanne, Weimerskirch Henri, |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Evidence for Sex-Segregated Ocean Distributions of First-Winter Wandering Albatrosses at Crozet Islands
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2014 |
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PLoS ONE |
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9 |
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2 |
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e86779- |
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The highly mobile wandering albatrosses (Diomedea exulans) are adapted to navigate the extreme environment of the Southern Ocean and return to isolated islands to breed. Each year they cover several hundreds of thousands of kilometers during travels across the sea. Little is known about the dispersal flights and migration of young albatrosses. We tracked, by satellite telemetry, the departure dispersal of 13 juvenile wandering albatrosses from the Crozet Islands and compared them with tracks of 7 unrelated adults during the interbreeding season. We used the satellite tracks to identify different behavioural steps of the inherited migration program used by juvenile wandering albatrosses during their first solo-migration. Our results show that the juvenile wandering albatrosses from Crozet Islands moved to sex-specific foraging zones of the ocean using at departures selectively the wind. The results suggest that the inherited migration program used by the juvenile wandering albatrosses encode several distinct steps, based on inherited preferred departure routes, differences in migration distance between sexes, and selective use of winds. During long transportation flights the albatrosses were influenced by winds and both adult and juveniles followed approximate loxodrome (rhumbline) routes coinciding with the foraging zone and the specific latitudes of their destination areas. During the long segments of transportation flights across open seas the juveniles selected routes at more northerly latitudes than adults.
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Public Library of Science |
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1932-6203 |
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5039 |
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Aki Tsuruta, Tuula Aalto, Leif Backman, Janne Hakkarainen, Ingrid T. van der Laan-Luijkx, Maarten C. Krol, Renato Spahni, Sander Houweling, Marko Laine, Ed Dlugokencky, Angel J. Gomez-Pelaez, Marcel van der Schoot, Ray Langenfelds, Raymond Ellul, Jgor Arduini, Francesco Apadula, Christoph Gerbig, Dietrich G. Feist, Rigel Kivi, Yukio Yoshida, Wouter Peters |
![find book details (via ISBN) isbn](img/isbn.gif)
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Title |
Global methane emission estimates for 2000–2012 from CarbonTracker Europe-CH4 v1.0 |
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2017 |
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Geoscientific Model Development |
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10 |
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3 |
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1261-1289 |
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Abstract. We present a global distribution of surface methane (CH4) emission estimates for 2000–2012 derived using the CarbonTracker Europe-CH4 (CTE-CH4) data assimilation system. In CTE-CH4, anthropogenic and biospheric CH4 emissions are simultaneously estimated based on constraints of global atmospheric in situ CH4 observations. The system was configured to either estimate only anthropogenic or biospheric sources per region, or to estimate both categories simultaneously. The latter increased the number of optimizable parameters from 62 to 78. In addition, the differences between two numerical schemes available to perform turbulent vertical mixing in the atmospheric transport model TM5 were examined. Together, the system configurations encompass important axes of uncertainty in inversions and allow us to examine the robustness of the flux estimates. The posterior emission estimates are further evaluated by comparing simulated atmospheric CH4 to surface in situ observations, vertical profiles of CH4 made by aircraft, remotely sensed dry-air total column-averaged mole fraction (XCH4) from the Total Carbon Column Observing Network (TCCON), and XCH4 from the Greenhouse gases Observing Satellite (GOSAT). The evaluation with non-assimilated observations shows that posterior XCH4 is better matched with the retrievals when the vertical mixing scheme with faster interhemispheric exchange is used. Estimated posterior mean total global emissions during 2000–2012 are 516±51Tg CH4yr−1, with an increase of 18Tg CH4yr−1 from 2000–2006 to 2007–2012. The increase is mainly driven by an increase in emissions from South American temperate, Asian temperate and Asian tropical TransCom regions. In addition, the increase is hardly sensitive to different model configurations ( < 2Tg CH4yr−1 difference), and much smaller than suggested by EDGAR v4.2 FT2010 inventory (33Tg CH4yr−1), which was used for prior anthropogenic emission estimates. The result is in good agreement with other published estimates from inverse modelling studies (16–20Tg CH4yr−1). However, this study could not conclusively separate a small trend in biospheric emissions (−5 to +6.9Tg CH4yr−1) from the much larger trend in anthropogenic emissions (15–27Tg CH4yr−1). Finally, we find that the global and North American CH4 balance could be closed over this time period without the previously suggested need to strongly increase anthropogenic CH4 emissions in the United States. With further developments, especially on the treatment of the atmospheric CH4 sink, we expect the data assimilation system presented here will be able to contribute to the ongoing interpretation of changes in this important greenhouse gas budget. |
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1991-959X |
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1991-959X |
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7332 |
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Akinori Takahashi, Jean-Baptiste Thiebot, Yuuki Watanabe, Thierry Raclot, Yan Ropert-Coudert |
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Migratory movements and winter diving behaviour of Adélie penguins from two East Antarctic colonies |
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2017 |
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6th international bio-logging science symposium, konstanz, germany, 25-29/09/2017 |
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7536 |
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