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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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2169-9402 |
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yes |
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8568 |
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2022 |
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22 |
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3 |
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136 |
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1492-8442 |
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yes |
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8547 |
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Title |
Metabolic heat loss in southern elephant seals (Mirounga leonina) differs with stage of moult and between habitats |
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Year |
2022 |
Publication |
Journal of Thermal Biology |
Abbreviated Journal |
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Volume |
104 |
Issue |
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Pages |
103183 |
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Keywords |
Heat loss Marine mammals Moult Pinnipeds Skin temperature Thermoregulation |
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1201 |
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0306-4565 |
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yes |
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8389 |
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Title |
Long-term monitoring reveals topographical features and vegetation that explain winter habitat use of an Arctic rodent |
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Journal |
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Year |
2022 |
Publication |
Arctic Science |
Abbreviated Journal |
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Volume |
8 |
Issue |
2 |
Pages |
349-361 |
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Abstract |
The quality of wintering habitats, such as depth of snow cover, plays a key role in sustaining population dynamics of Arctic lemmings. However, few studies so far investigated habitat use during the Arctic winter. Here, we used a unique long-term time series to test whether lemmings are associated with topographical and vegetational habitat features for their wintering sites. We examined yearly numbers and distribution of 22 769 winter nests of the collared lemming Dicrostonyx groenlandicus (Traill, 1823) from an ongoing long-term research on Traill Island, Northeast Greenland, collected between 1989 and 2019, and correlated this information with data on dominant vegetation types, elevation, and slope. We found that the number of lemming nests was highest in areas with a high proportion of Dryas heath, but was also correlated with other vegetation types, suggesting some flexibility in resource use of wintering lemmings. Furthermore, lemmings showed a higher use for sloped terrain, probably as it enhances the formation of deep snow drifts, which increases the insulative characteristics of the snowpack and protection from predators. With global warming, prime lemming winter habitats may become scarce through alteration of snow physical properties, potentially resulting in negative consequence for the whole community of terrestrial vertebrates. |
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1036 |
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yes |
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Call Number |
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Serial |
8426 |
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Year |
2022 |
Publication |
PaleoAmerica |
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Volume |
8 |
Issue |
1 |
Pages |
29-52 |
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Keywords |
Brazil geofacts Late Glacial Maximum Pedra Furada Peopling of the Americas |
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1217 |
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ISSN |
2055-5563 |
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yes |
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Call Number |
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Serial |
8585 |
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Author |
Yanzhi Cao, Zhuang Jiang, Becky Alexander, Jihong Cole-Dai, Joel Savarino, Joseph Erbland, Lei Geng |
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Title |
On the potential fingerprint of the Antarctic ozone hole in ice-core nitrate isotopes: a case study based on a South Pole ice core |
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Year |
2022 |
Publication |
Atmospheric chemistry and physics |
Abbreviated Journal |
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Volume |
22 |
Issue |
20 |
Pages |
13407-13422 |
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Programme |
1177 |
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ISSN |
1680-7316 |
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yes |
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8455 |
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Title |
Assessing marine ecosystem complexity: isotopic integration of the trophic structure of seabird communities from the Southern Ocean |
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Year |
2022 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
694 |
Issue |
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Pages |
193-208 |
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Keywords |
Antarctica Body size Habitat Penguins Procellariiformes Stable isotopes Trophic position |
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109 |
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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 |
8321 |
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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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109 |
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ISSN |
1432-2056 |
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yes |
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Serial |
8567 |
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Author |
Yves Cherel, Pierrick Bocher |
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Title |
Diet of the soft-plumaged petrel (Pterodroma mollis) at Kerguelen Islands and a review of the food of gadfly petrels (Pterodroma spp.) worldwide |
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Journal |
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Year |
2022 |
Publication |
Marine Biology |
Abbreviated Journal |
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Volume |
169 |
Issue |
2 |
Pages |
31 |
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Keywords |
Fish Food Myctophidae Procellariiformes Seabirds Southern Ocean Squid Tropics |
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Abstract |
Little is known on the food and feeding ecology of the soft-plumaged petrel Pterodroma mollis, which is the single gadfly petrel Pterodroma spp. with a circumpolar breeding distribution within the Southern Ocean. Our primary goal was to describe its diet at Kerguelen Islands, which is the southernmost breeding locality of the species. Soft-plumaged petrels fed on fish (71% by mass), and secondarily on crustaceans (22%), while cephalopods (7%) and other items (<?1%) were minor dietary components. Eight-hundred and sixty prey were identified from the pooled 33 food samples, with the 2 hyperiid amphipods Cyllopus magellanicus (48%) and Themisto gaudichaudii (35%) being the main food items by number. Owing to their larger size than crustaceans, mesopelagic fishes were the main prey by mass, with myctophids being the most important fish family in terms of both abundance (68% of the fish) and diversity (10 species). Prey distribution indicated that soft-plumaged petrels foraged primarily in oceanic subantarctic waters to feed their chicks. The oceanic life style of gadfly petrels was then highlighted by a review of their diet worldwide (20 species, 26 studies). Gadfly petrels prey mainly upon mesopelagic fishes (chiefly myctophids) and squids with their relative proportions depending on species and localities. Crustaceans are minor food items for tropical species, but they form a significant part of the food of the small- and medium-sized petrels that live in temperate and cold waters. The review underlines the need for more well-designed investigations on this globally endangered group of seabirds, since dietary information is available for only 57% of the 35 species of gadfly petrels. |
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109 |
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1432-1793 |
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yes |
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8340 |
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Author |
Chastel O., Blévin P., Humann?Guilleminot S., Helfenstein F., Tartu S., Angelier F., Sebastiano M., Costantini D., Shaffer S., Bustamante P., Labadie P., Budzinski H., Herzke D., Moe B., Bustnes J.O., Gabrielsen G.W. |
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Title |
Contaminants of growing concern: Poly- and Perfluoroalkylated Substances (PFAS) and their physiological consequences in seabirds |
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Peer-reviewed symposium |
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Year |
2021 |
Publication |
World seabird conference virtual meeting, October 4-8, 2021 |
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330 |
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yes |
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8334 |
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