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Melissa L. Grunst, Andrea S. Grunst, David Grémillet, Jérôme Fort |
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Title |
Avian Energetics in a Warming Arctic |
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Journal |
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Year  |
2023 |
Publication |
The Bulletin of the Ecological Society of America |
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Volume |
104 |
Issue |
3 |
Pages |
e2073 |
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Abstract |
The Arctic is warming nearly four times as rapidly as other regions of the planet, challenging the capacity of organisms to cope with shifting resources and maintain thermal balance. Tracking responses of free-living animals in dynamic environments can be challenging, but is increasingly enabled by advanced biologging approaches. We used data gathered from miniaturized bird-borne devices to demonstrate increases in energy expenditure with declining sea ice conditions and warming sea surface temperatures in a dove-sized seabird, the little auk (also named dovekie; Alle alle). This keystone species feeds on sea ice-associated copepods and inhabits large breeding colonies in the High Arctic. |
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388 |
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2327-6096 |
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yes |
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8618 |
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Mojtahid M., Fossile E., Santoni S., Husum K., Streuff K., Forwick M., Howa H., Nardelli MP. |
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Title |
Benthic foraminifera as tools to reconstruct past tidewater glacier dynamics: A case study from Kongsfjorden (Svalbard) |
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Peer-reviewed symposium |
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Year |
2023 |
Publication |
International symposium on foraminifera forams 2023, 26-30 june 2023, perugia, italy |
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1223 |
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yes |
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8741 |
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Nairita Pal, Kristin N. Barton, Mark R. Petersen, Steven R. Brus, Darren Engwirda, Brian K. Arbic, Andrew F. Roberts, Joannes J. Westerink, Damrongsak Wirasaet |
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Title |
Barotropic tides in MPAS-Ocean (E3SM V2): impact of ice shelf cavities |
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Year |
2023 |
Publication |
Geoscientific Model Development |
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Volume |
16 |
Issue |
4 |
Pages |
1297-1314 |
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Abstract |
Oceanic tides are seldom represented in Earth system models (ESMs) owing to the need for high horizontal resolution to accurately represent the associated barotropic waves close to coasts. This paper presents results of tides implemented in the Model for Prediction Across Scales–Ocean or MPAS-Ocean, which is the ocean component within the U.S. Department of Energy developed Energy Exascale Earth System Model (E3SM). MPAS-Ocean circumvents the limitation of low resolution using unstructured global meshing. We are at this stage simulating the largest semidiurnal (M2, S2, N2) and diurnal (K1, O1) tidal constituents in a single-layer version of MPAS-O. First, we show that the tidal constituents calculated using MPAS-Ocean closely agree with the results of the global tidal prediction model TPXO8 when suitably tuned topographic wave drag and bottom drag coefficients are employed. Thereafter, we present the sensitivity of global tidal evolution due to the presence of Antarctic ice shelf cavities. The effect of ice shelves on the amplitude and phase of tidal constituents are presented. Lower values of complex errors (with respect to TPXO8 results) for the M2 tidal constituents are observed when the ice shelf is added in the simulations, with particularly strong improvement in the Southern Ocean. Our work points towards future research with varying Antarctic ice shelf geometries and sea ice coupling that might lead to better comparison and prediction of tides and thus better prediction of sea-level rise and also the future climate variability. |
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688 |
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1991-959X |
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yes |
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8619 |
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Author |
Nicolas J., Verdun J., Baltzer A., Boy JP., Lemoine JP., Perosanz F., Tafflet A., |
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Title |
SIGNEAU : Signatures climatiques des surcharges hydrologiques observées par géodésie spatiale |
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Peer-reviewed symposium |
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Year |
2023 |
Publication |
Journées scientifiques de l'OSUNA, 5 juin 2023 |
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1223 |
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yes |
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Serial |
8738 |
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Author |
Noah Vowell, Joseph E. Rodriguez, Samuel N. Quinn, George Zhou, Andrew Vanderburg, Andrew W. Mann, Matthew J. Hooton, Keivan G. Stassun, Saburo Howard, Allyson Bieryla, David W. Latham, Steve B. Howell, Tristan Guillot, Carl Ziegler, Karen A. Collins, Theron W. Carmichael, Jon M. Jenkins, Avi Shporer, Lyu ABE, Philippe Bendjoya, Jonathan L. Bush, Marco Buttu, Kevin I. Collins, Jason D. Eastman, Matthew J. Fields, Thomas Gasparetto, Maximilian N. Günther, Veselin B. Kostov, Adam L. Kraus, Kathryn V. Lester, Alan M. Levine, Colin Littlefield, Wenceslas Marie-Sainte, Djamel Mékarnia, Hugh P. Osborn, David Rapetti, George R. Ricker, S. Seager, Ramotholo Sefako, Gregor Srdoc, Olga Suarez, Guillermo Torres, Amaury H. M. J. Triaud, R. Vanderspek, Joshua N. Winn |
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Title |
HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star |
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Journal |
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Year |
2023 |
Publication |
The Astronomical Journal |
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Volume |
165 |
Issue |
6 |
Pages |
268 |
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Abstract |
We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting a late B star, discovered by NASA's Transiting Exoplanet Survey Satellite as TOI-588 b. HIP 33609 b is a large (R b = R J) brown dwarf on a highly eccentric (e = ) orbit with a 39 days period. The host star is a bright (V = 7.3 mag), T eff = 10,400 K star with a mass of M * = M ⊙ and radius of R * = R ⊙, making it the hottest transiting brown dwarf host star discovered to date. We obtained radial velocity measurements from the CHIRON spectrograph confirming the companion's mass of M b = M J as well as the host star's rotation rate ( km s−1). We also present the discovery of a new comoving group of stars, designated as MELANGE-6, and determine that HIP 33609 is a member. We use a combination of rotation periods and isochrone models fit to the cluster members to estimate an age of 150 ± 25 Myr. With a measured mass, radius, and age, HIP 33609 b becomes a benchmark for substellar evolutionary models. |
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1066 |
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1538-3881 |
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1538-3881 |
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yes |
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8683 |
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Author |
Noiret A., Viblanc V., Bocquet C., Lemmonier C., Lewden A., Robin Jp., Bize P. &Amp; Stier A. |
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Title |
HotPenguin: stress thermique et agressivité soutiennent l’hypothèse température-agression chez le manchot royal en période de reproduction |
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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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Abstract |
Les endothermes polaires et subpolaires, adaptés à un climat froid, pourraient se révéler particulièrement sensibles au stress thermique dans un contexte de réchauffement global. L'hypothèse température-agression – qui propose un lien causal entre températures ambiantes élevées et motivation agressive – pourrait accentuer le stress thermique. Essentiellement étudiée pour des raisons socio-économiques, l’hypothèse est peu investiguée chez les espèces sauvages. L’étude de manchots royaux en période de reproduction (n= 85, Crozet), a permis de mettre en évidence des relations positives entre paramètres climatiques (température, radiation solaire), température sous-cutanée, indicateurs comportementaux de stress thermique (halètement, écartement des ailerons) et agressivité envers les congénères. Nos résultats ouvrent de nouvelles perspectives écologiques pour l'hypothèse température-agression, et encouragent l'étude du stress thermique dans les écosystèmes polaires. |
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119 |
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yes |
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Serial |
8667 |
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Author |
Olivia Hicks, Akiko Kato, Danuta M. Wisniewska, Coline Marciau, Frédéric Angelier, Yan Ropert-Coudert, Arne Hegemann |
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Title |
Holding time has limited impact on constitutive innate immune function in a long-lived Antarctic seabird, the Adélie penguin: implications for field studies |
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Year |
2023 |
Publication |
Biology Open |
Abbreviated Journal |
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Volume |
12 |
Issue |
2 |
Pages |
bio059512 |
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Keywords |
Animals Antarctic Antarctic Regions Ecoimmunology Field study Immunity Spheniscidae Stress |
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Abstract |
There is great interest in measuring immune function in wild animals. Yet, field conditions often have methodological challenges related to handling stress, which can alter physiology. Despite general consensus that immune function is influenced by handling stress, previous studies have provided equivocal results. Furthermore, few studies have focused on long-lived species, which may have different stress-immune trade-offs compared to short-lived species that have primarily been tested. Here, we investigate whether capture and handling duration impacts innate immune function in a long-lived seabird, the Adélie penguin (Pygoscelis adeliae). We found no evidence for changes in three commonly used parameters of innate immune function upon holding time of up to 2 h, suggesting that immune function in this species is more robust against handling than in other species. This opens up exciting possibilities for measuring immune function in species with similar life-histories even if samples cannot be taken directly after capture. |
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1091 |
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2046-6390 |
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yes |
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8761 |
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Pauline Douce, Florian Mermillod‐blondin, Laurent Simon, Sylvain Dolédec, Pauline Eymar‐dauphin, David Renault, Cécile Sulmon, Félix Vallier, Anne-Kristel Bittebiere |
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Title |
Biotic and abiotic drivers of aquatic plant communities in shallow pools and wallows on the sub‐Antarctic Iles Kerguelen |
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Year |
2023 |
Publication |
Polar Biology |
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Volume |
46 |
Issue |
4 |
Pages |
303 |
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Abstract |
In the sub-Antarctic region, climate change is particularly rapid, while their freshwater ecosystems, such as ponds, host plant species with limited spatial distributions. These particular systems and their plant communities remain however poorly known and the context of their changing habitat calls for deeper insights into these systems. We performed an extensive survey of 45 ponds over three locations of the Iles Kerguelen during the winter and summer seasons of two years, which included the measurement of 12 abiotic parameters and the assessment of the plant community composition. Overall, our results showed that Iles Kerguelen ponds are shallow freshwater ecosystems harbouring species-poor plant communities with high even- ness, of which structure did not vary among the sampled locations. Three different habitats were identified among ponds in relation with nutrient supply by marine animals, which ultimately influenced plant community structure and cover. We highlight that these habitats are mostly determined by water depth, nutrients, and temperature (mean and variance). Present plant community composition was more strongly correlated with plant community composition in the previous year than with abiotic conditions. Overall, this study provides new knowledge on the aquatic plant communities and the functioning of Iles Kerguelen freshwater ecosystems, which can serve as a basis for future studies dealing with the impact of climate change in the sub-Antarctic region. |
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136 |
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yes |
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8682 |
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Pengyang Song, Dmitry Sidorenko, Patrick Scholz, Maik Thomas, Gerrit Lohmann |
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Title |
The tidal effects in the Finite-volumE Sea ice–Ocean Model (FESOM2.1): a comparison between parameterised tidal mixing and explicit tidal forcing |
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Year |
2023 |
Publication |
Geoscientific Model Development |
Abbreviated Journal |
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Volume |
16 |
Issue |
1 |
Pages |
383-405 |
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Abstract |
Tides are proved to have a significant effect on the ocean and climate. Previous modelling research either adds a tidal mixing parameterisation or an explicit tidal forcing to the ocean models. However, no research compares the two approaches in the same framework. Here we implement both schemes in a general ocean circulation model and assess both methods by comparing the results. The aspects for comparison involve hydrography, sea ice, meridional overturning circulation (MOC), vertical diffusivity, barotropic streamfunction and energy diagnostics. We conclude that although the mesh resolution is poor in resolving internal tides in most mid-latitude and shelf-break areas, explicit tidal forcing still shows stronger tidal mixing at the Kuril–Aleutian Ridge and the Indonesian Archipelago than the tidal mixing parameterisation. Beyond that, the explicit tidal forcing method leads to a stronger upper cell of the Atlantic MOC by enhancing the Pacific MOC and the Indonesian Throughflow. Meanwhile, the tidal mixing parameterisation leads to a stronger lower cell of the Atlantic MOC due to the tidal mixing in deep oceans. Both methods maintain the Antarctic Circumpolar Current at a higher level than the control run by increasing the meridional density gradient. We also show several phenomena that are not considered in the tidal mixing parameterisation, for example, the changing of energy budgets in the ocean system, the bottom drag induced mixing on the continental shelves and the sea ice transport by tidal motions. Due to the limit of computational capacity, an internal-tide-resolving simulation is not feasible for climate studies. However, a high-resolution short-term tidal simulation is still required to improve parameters and parameterisation schemes in climate studies. |
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688 |
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1991-959X |
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yes |
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Serial |
8643 |
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Author |
Pepen Supendi, Nicholas Rawlinson, Bambang Setiyo Prayitno, Dimas Sianipar, Andrean Simanjuntak, Sri Widiyantoro, Kadek Hendrawan Palgunadi, Andri Kurniawan, Hasbi Ash Shiddiqi, Andri Dian Nugraha, David P. Sahara, Daryono Daryono, Rahmat Triyono, Suko Prayitno Adi, Dwikorita Karnawati, Gatut Daniarsyad, Suaidi Ahadi, Iman Fatchurochman, Suci Dewi Anugrah, Nova Heryandoko, Ajat Sudrajat |
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A previously unidentified fault revealed by the February 25, 2022 (Mw 6.1) Pasaman Earthquake, West Sumatra, Indonesia |
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Year |
2023 |
Publication |
Physics of the Earth and Planetary Interiors |
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Volume |
334 |
Issue |
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Pages |
106973 |
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Keywords |
Earthquake Focal mechanism Kajai Fault Relocation Rupture Stress-change |
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Abstract |
A destructive earthquake (Mw 6.1) struck Pasaman, West Sumatra, Indonesia, on 25 February 2022, resulting in at least 18 deaths and damage to 1765 buildings. Our relocated foreshock, mainshock, and aftershocks and their source mechanisms reveal a previously unknown ∼20 km long segment of the Sumatran Fault as a result of dextral strike-slip motion (strike N132oE and dip 72oSW) along what we have called the Kajai Fault. The inverted rupture model indicates a single, compact asperity with an approximate depth range of 2–11 km. This asperity extends ∼14 km along strike, and ∼9 km in the down-dip direction. The Coulomb stress change of the mainshock shows that areas to the north and south experienced an increase in stress, which is consistent with the observed aftershock pattern. The nearby Great Sumatran Fault segments (Angkola and Sumpur) experienced a significant increase in stress without any accompanying aftershocks, which likely increases the risk of them rupturing in the future. |
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133 |
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0031-9201 |
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yes |
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Call Number |
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Serial |
8528 |
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| Permanent link to this record |
