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| Ainley, Dg; Hobson, Ka; Crosta, X; Rau, Gh; Wassenaar, Li; Augustinus, Pc. |
| Here we present first time evidence for concordant variation in the isotopic signature at both the base and the upper levels of the Antarctic coastal food web during the Holocene. Laminae in sub-fossil deposits of snow petrel Pagodroina nivea stomach oil, known as mumiyo, were collected from nest-sites in the Bunger Hills, East Antarctica. Mumiyo layers were sub-sampled, radiocarbondated, and analyzed for delta C-13 and delta D. The obtained values were compared to isotopic variability among layers of an ocean sediment core collected, and similarly dated, in nearby Dumont D'Urville Trough. Overlapping records extended from about 10 160 to 526 calendar years before present (cal yr BP). Mumiyo delta D values remained relatively constant throughout the... |
| Tipo: Text |
Palavras-chave: Antarctica; Holocene climate change; Food webs; Isotopic analysis; Mumiyo; Pagodroma nivea; Sediment cores; Snow petrel. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00496/60808/64708.pdf |
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| Lericolais, Gilles; Algan, Oya; Morigi, Caterina; Okay, Seda; Kirci-elmas, Elmas; Cifci, Gunay. |
| Since the preliminary mapping of the northern Bosphorus outlet of the Black Sea continental shelf by the 90’s NATO project, an important data set bringing morphological, seismic and sedimentological information is now available to describe there a shallow fan system consisting of a main channel and short distributary branches, levees, and sediment waves, correlative to a southern source flowing to the north. This paper brings complementary quantitative data from landscape at the eastern and western shelf area of the shallow fan system. It confirms that the Bosphorus outlet fan preserved on the shelf surface provides an important record of surface water flow. To deduce the history of the Marmara/Black Sea last connexion, it is fundamental to understand how... |
| Tipo: Text |
Palavras-chave: Bosphorus; Black Sea; Seismic; Sediment cores; Multibeam bathymetry; Shallow fan. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00501/61254/64838.pdf |
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| Awasthi, Neeraj; Ray, Jyotiranjan S. |
| Terrestrial and marine sediments preserved on the Indian sub-continent and in seas/oceans around it are excellent archives for studying and reconstructing past variations in monsoonal climate. Based on the multiproxy studies on the sediment cores, a coherent relationship between the intensities of the monsoon and glacial–interglacial conditions and a strong atmospheric teleconnection between the Asian and North Atlantic climates has been suggested. Terrestrial sediment cores clearly established that the variations in the monsoonal climate and/or change in glacial extant played an important role in varying weathering/erosion in source regions and relative supply of sediments. Marine sediment studies presented a more complicated picture because their... |
| Tipo: Text |
Palavras-chave: Climate; Himalaya; Indian monsoon; Sediment cores; Sr-Nd isotopes; Weathering-erosion. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00643/75467/76290.pdf |
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