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Author |
Le Bris T., Barruol, G., Gimbert F., Le Meur E., Zigone, D. |
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Title |
Cryosismicité du glacier de l’Astrolabe : glissement basal, fracturation et modulation tidale |
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Peer-reviewed symposium |
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Year  |
2023 |
Publication |
19émes journées scientifiques du cnfra, 03-05 mai 2023, paris france |
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Issue |
Communication n°466 |
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1214 |
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yes |
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Serial |
8669 |
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Author |
Le Scornec E. |
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Title |
Emperor penguin demography: contributions of recent capture-mark-recapture surveys |
Type |
Master 2 |
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Year |
2023 |
Publication |
Master 2 |
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Abstract |
Cosupervision: Barbraud &Amp; le Bohec |
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137 |
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yes |
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Serial |
8719 |
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Author |
Lemonnier C., Bize P., Stier A., Cillard A., Montblanc M., Robin J-p., Handrich Y., Bost C-a., Viblanc V. |
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Title |
Compensating for harsh conditions at sea: plasticity of king penguin foraging strategies facing an experimental increase in workload |
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Peer-reviewed symposium |
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Year |
2023 |
Publication |
11th International Penguin Conference., 4-9 September 2023., Viña del Mar., Chile |
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119 |
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yes |
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8730 |
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Lemonnier C., Schull Q., Stier A., Boonstra R., Delahanty B., Lefol E., Durand L., Pardonnet S., Robin Jp., Criscuolo F., Bize P., Viblanc Va |
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Title |
Adaptive phenotypic programming to social density in king penguins |
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Peer-reviewed symposium |
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Year |
2023 |
Publication |
11th international penguin conference., 4-9 september 2023., viña del mar., chile |
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119 |
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yes |
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Call Number |
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Serial |
8731 |
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Author |
Lenourry L. |
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Title |
Adélie penguin (Pygoscelis adeliae) colony structuration in space and time: identifying selective pressures that shape colonial reproductive strategies |
Type |
Master 2 |
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Year |
2023 |
Publication |
Master 2 |
Abbreviated Journal |
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Abstract |
Cosupervision: Bonadonna & Le Bohec |
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Programme |
137 |
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Approved |
yes |
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Call Number |
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Serial |
8718 |
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Author |
Lissa Gourillon |
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Title |
Evolution des deltas et prodeltas du Lovenbreen depuis 2009 |
Type |
Master 1 |
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Year |
2023 |
Publication |
Etudiante d'intechmer- stage de 5 mois- encadrante : a. baltzer |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
65 p |
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Programme |
1223 |
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yes |
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Call Number |
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Serial |
8750 |
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Author |
Lizhou Sha, Andrew M Vanderburg, Chelsea X Huang, David J Armstrong, Rafael Brahm, Steven Giacalone, Mackenna L Wood, Karen A Collins, Louise D Nielsen, Melissa J Hobson, Carl Ziegler, Steve B Howell, Pascal Torres-Miranda, Andrew W Mann, George Zhou, Elisa Delgado-Mena, Felipe I Rojas, Lyu Abe, Trifon Trifonov, Vardan Adibekyan, Sérgio G Sousa, Sergio B Fajardo-Acosta, Tristan Guillot, Saburo Howard, Colin Littlefield, Faith Hawthorn, François-Xavier Schmider, Jan Eberhardt, Thiam-Guan Tan, Ares Osborn, Richard P Schwarz, Paul Strøm, Andrés Jordán, Gavin Wang, Thomas Henning, Bob Massey, Nicholas Law, Chris Stockdale, Elise Furlan, Gregor Srdoc, Peter J Wheatley, David Barrado Navascués, Jack J Lissauer, Keivan G Stassun, George R Ricker, Roland K Vanderspek, David W Latham, Joshua N Winn, Sara Seager, Jon M Jenkins, Thomas Barclay, Luke G Bouma, Jessie L Christiansen, Natalia Guerrero, Mark E Rose |
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Title |
TESS spots a mini- interior to a hot saturn in the TOI-2000 system |
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Journal |
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Year |
2023 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
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Volume |
524 |
Issue |
1 |
Pages |
1113-1138 |
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Abstract |
Hot jupiters (P < 10 d, M > 60 M⊕) are almost always found alone around their stars, but four out of hundreds known have inner companion planets. These rare companions allow us to constrain the hot jupiter’s formation history by ruling out high-eccentricity tidal migration. Less is known about inner companions to hot Saturn-mass planets. We report here the discovery of the TOI-2000 system, which features a hot Saturn-mass planet with a smaller inner companion. The mini-neptune TOI-2000 b (2.70 ± 0.15 R⊕, 11.0 ± 2.4 M⊕) is in a 3.10-d orbit, and the hot saturn TOI-2000 c ($8.14{-0.30}^{+0.31}$ R⊕ , $81.7{-4.6}^{+4.7}$ M⊕) is in a 9.13-d orbit. Both planets transit their host star TOI-2000 (TIC 371188886, V = 10.98, TESS magnitude = 10.36), a metal-rich ([Fe/H] = 0.439 $_{-0.043}^{+0.041}$) G dwarf 173 pc away. TESS observed the two planets in sectors 9–11 and 36–38, and we followed up with ground-based photometry, spectroscopy, and speckle imaging. Radial velocities from CHIRON, FEROS, and HARPS allowed us to confirm both planets by direct mass measurement. In addition, we demonstrate constraining planetary and stellar parameters with MIST stellar evolutionary tracks through Hamiltonian Monte Carlo under the PyMC framework, achieving higher sampling efficiency and shorter run time compared to traditional Markov chain Monte Carlo. Having the brightest host star in the V band among similar systems, TOI-2000 b and c are superb candidates for atmospheric characterization by the JWST, which can potentially distinguish whether they formed together or TOI-2000 c swept along material during migration to form TOI-2000 b. |
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Programme |
1066 |
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ISSN |
0035-8711 |
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yes |
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Call Number |
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Serial |
8641 |
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Author |
Loïc Le Ster, Hervé Claustre, Francesco d’Ovidio, David Nerini, Baptiste Picard, Christophe Guinet |
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Title |
Improved accuracy and spatial resolution for bio-logging-derived chlorophyll a fluorescence measurements in the Southern Ocean |
Type |
Journal |
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Year |
2023 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
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Volume |
10 |
Issue |
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Pages |
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Abstract |
The ocean’s meso- and submeso-scales (1-100 km, days to weeks) host features like filaments and eddies that have a key structuring effect on phytoplankton distribution, but that due to their ephemeral nature, are challenging to observe. This problem is exacerbated in regions with heavy cloud coverage and/or difficult access like the Southern Ocean, where observations of phytoplankton distribution by satellite are sparse, manned campaigns costly, and automated devices limited by power consumption. Here, we address this issue by considering high-resolution in-situ data from 18 bio-logging devices deployed on southern elephant seals (Mirounga leonina) in the Kerguelen Islands between 2018 and 2020. These devices have submesoscale-resolving capabilities of light profiles due to the high spatio-temporal frequency of the animals’ dives (on average 1.1 +-0.6 km between consecutive dives, up to 60 dives per day), but observations of fluorescence are much coarser due to power constraints. Furthermore, the chlorophyll a concentrations derived from the (uncalibrated) bio-logging devices’ fluorescence sensors lack a common benchmark to properly qualify the data and allow comparisons of observations. By proposing a method based on functional data analysis, we show that a reliable predictor of chlorophyll a concentration can be constructed from light profiles (14 686 in our study). The combined use of light profiles and matchups with satellite ocean-color data enable effective (1) homogenization then calibration of the bio-logging devices’ fluorescence data and (2) filling of the spatial gaps in coarse-grained fluorescence sampling. The developed method improves the spatial resolution of the chlorophyll a field description from ~30 km to ~12 km. These results open the way to empirical study of the coupling between physical forcing and biological response at submesoscale in the Southern Ocean, especially useful in the context of upcoming high-resolution ocean-circulation satellite missions. |
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Programme |
109 |
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ISSN |
2296-7745 |
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yes |
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Call Number |
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Serial |
8540 |
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Author |
Loïc Le Ster, Hervé Claustre, Francesco d’Ovidio, David Nerini, Baptiste Picard, Christophe Guinet |
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Title |
Improved accuracy and spatial resolution for bio-logging-derived chlorophyll a fluorescence measurements in the Southern Ocean |
Type |
Journal |
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Year |
2023 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
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Volume |
10 |
Issue |
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Pages |
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Keywords |
bio-logging tag chla fluorescence Sensor calibration Southern elephant seal Southern Ocean Submesoscale |
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Abstract |
The ocean’s meso- and submeso-scales (1-100 km, days to weeks) host features like filaments and eddies that have a key structuring effect on phytoplankton distribution, but that due to their ephemeral nature, are challenging to observe. This problem is exacerbated in regions with heavy cloud coverage and/or difficult access like the Southern Ocean, where observations of phytoplankton distribution by satellite are sparse, manned campaigns costly, and automated devices limited by power consumption. Here, we address this issue by considering high-resolution in-situ data from 18 bio-logging devices deployed on southern elephant seals (Mirounga leonina) in the Kerguelen Islands between 2018 and 2020. These devices have submesoscale-resolving capabilities of light profiles due to the high spatio-temporal frequency of the animals’ dives (on average 1.1 +-0.6 km between consecutive dives, up to 60 dives per day), but observations of fluorescence are much coarser due to power constraints. Furthermore, the chlorophyll a concentrations derived from the (uncalibrated) bio-logging devices’ fluorescence sensors lack a common benchmark to properly qualify the data and allow comparisons of observations. By proposing a method based on functional data analysis, we show that a reliable predictor of chlorophyll a concentration can be constructed from light profiles (14 686 in our study). The combined use of light profiles and matchups with satellite ocean-color data enable effective (1) homogenization then calibration of the bio-logging devices’ fluorescence data and (2) filling of the spatial gaps in coarse-grained fluorescence sampling. The developed method improves the spatial resolution of the chlorophyll a field description from ~30 km to ~12 km. These results open the way to empirical study of the coupling between physical forcing and biological response at submesoscale in the Southern Ocean, especially useful in the context of upcoming high-resolution ocean-circulation satellite missions. |
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1201 |
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2296-7745 |
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yes |
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Serial |
8770 |
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Author |
Lucie A. Malard, Benoit Bergk-Pinto, Rose Layton, Timothy M. Vogel, Catherine Larose, David A. Pearce |
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Title |
Snow Microorganisms Colonise Arctic Soils Following Snow Melt |
Type |
Journal |
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Year |
2023 |
Publication |
Microbial Ecology |
Abbreviated Journal |
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Pages |
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Keywords |
Airborne dispersal Arctic ecosystems Bacterial diversity Coalescence Microbial colonisation Snow Soils |
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Abstract |
Arctic soils are constantly subjected to microbial invasion from either airborne, marine, or animal sources, which may impact local microbial communities and ecosystem functioning. However, in winter, Arctic soils are isolated from outside sources other than snow, which is the sole source of microorganisms. Successful colonisation of soil by snow microorganisms depends on the ability to survive and compete of both, the invading and resident community. Using shallow shotgun metagenome sequencing and amplicon sequencing, this study monitored snow and soil microbial communities throughout snow melt to investigate the colonisation process of Arctic soils. Microbial colonisation likely occurred as all the characteristics of successful colonisation were observed. The colonising microorganisms originating from the snow were already adapted to the local environmental conditions and were subsequently subjected to many similar conditions in the Arctic soil. Furthermore, competition-related genes (e.g. motility and virulence) increased in snow samples as the snow melted. Overall, one hundred potentially successful colonisers were identified in the soil and, thus, demonstrated the deposition and growth of snow microorganisms in soils during melt. |
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Programme |
1192 |
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ISSN |
1432-184X |
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yes |
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Call Number |
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Serial |
8552 |
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| Permanent link to this record |
