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| Registros recuperados: 11 | |
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| Belt, Simon T.; Mueller, Juliane. |
| In recent years, a novel proxy for the past occurrence of Arctic sea ice has been proposed that is based on the variable marine sedimentary abundance of an organic geochemical lipid derived from sea ice diatoms in the spring. This lipid, termed IP25 (Ice Proxy with 25 carbon atoms), is a highly branched isoprenoid mono-unsaturated alkene that appears to be sufficiently stable in sediments to permit meaningful palaeo sea ice reconstructions to be carried out over short- to long-term timescales. Since the first proposed use of IP25 as a proxy for palaeo sea ice by Belt et al. (2007), a number of laboratories have measured this biomarker in Arctic sediments and it is anticipated that research activity in this area will increase further in the future. The... |
| Tipo: Text |
Palavras-chave: Sea ice; Arctic; Proxy; IP25; Biomarker; Palaeoclimate. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00263/37473/36537.pdf |
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| Zhang, Xiaosen; Reed, Jane; Wagner, Bernd; Francke, Alexander; Levkov, Zlatko. |
| The juncture between the west-east and north-south contrasting Holocene climatic domains across the Mediterranean is complex and poorly understood. Diatom analysis of Lake Dojran (Republic of Macedonia/Greece) provides a new insight into lake levels and trophic status during the Lateglacial and Holocene periods in the northeastern Mediterranean. Following a very shallow or even desiccated state at the core base at ca. 12,500 cal yr BP, indicated by sedimentological and hydro-acoustic data, diatoms indicate lake infilling, from a shallow state with abundant benthos to a plankton-dominated relatively high lake level and eutrophic state thereafter. Diatom-inferred shallowing between ca. 12,400-12,000 cal yr BP and a very low lake level and eutrophic,... |
| Tipo: Text |
Palavras-chave: Palaeoclimate; Diatom; Lake Dojran; Mediterranean; Balkans; Younger Dryas; Holocene. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00289/40062/39293.pdf |
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| Auffret, Gérard-andré; Zaragosi, S; Voisset, Michel; Droz, Laurence; Loubrieu, Benoit; Pelleau, Pascal; Savoye, R; Bourillet, Jean-francois; Baltzer, Agness; Bourquin, S; Dennielou, Bernard; Coutelle, Alain; Weber, N; Floch, Gilbert. |
| During the SEDIFAN 1 cruise we surveyed the bathymetry and the acoustic properties of the surface sediment of the Celtic Deep Sea Fan. We also collected Kullenberg cores in order to study recent sedimentary processes. From the bathymetry survey it is relatively easy to recognize the main areas of modern fan. The upper fan included a large sedimentary ridge which constitutes the right levee of the prominent meandering Whittard valley. After its confluence with the Shamrock valley the course of the Whittard valley is abruptly deflected to the south. At a short distance to the south the valley divides into two upper-fan channels, the Celtic channel to the west being the deeper one. This point constitutes the centre of a radiating pattern which is developed on... |
| Tipo: Text |
Palavras-chave: Paléoclimat; Turbidité; Sédiment; Quaternaire; Eventail profond; Palaeoclimate; Turbidity; Sediment; Quaternary; Deep sea fan. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-525.pdf |
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| Blockley, Simon P. E.; Bourne, Anna J.; Brauer, Achim; Davies, Siwan M.; Hardiman, Mark; Harding, Poppy R.; Lane, Christine S.; Macleod, Alison; Matthews, Ian P.; Pyne-o'Donnell, Sean D. F.; Rasmussen, Sune O.; Wulf, Sabine; Zanchetta, Giovanni. |
| The comparison of palaeoclimate records on their own independent timescales is central to the work of the INTIMATE (INTegrating Ice core, MArine and TErrestrial records) network. For the North Atlantic region, an event stratigraphy has been established from the high-precision Greenland ice-core records and the integrated GICCO5 chronology. This stratotype provides a palaeoclimate signal to which the timing and nature of palaeoenvironmental change recorded in marine and terrestrial archives can be compared. To facilitate this wider comparison, without assuming synchroneity of climatic change/proxy response, INTIMATE has also focussed on the development of tools to achieve this. In particular the use of time-parallel marker horizons e.g. tephra layers... |
| Tipo: Text |
Palavras-chave: Event-stratigraphy; Tephrochronology; INTIMATE; Greenland ice cores; Palaeoenvironment; Palaeoclimate. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00289/40028/39254.pdf |
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| Vanderaveroet, P. |
| The clay fraction of sediments drilled at Ocean Drilling Program (ODP) sites 1071 and 1072 is composed of variable proportions of chlorite, illite, smectite. kaolinite, vermiculite and mixed-layers such as illite/vermiculite (I/V) and chlorite/vermiculite (C/V). Miocene and Pliocene climates allowed formation of vermiculite and kaolinite. Pleistocene clay sedimentation was characterized by abundant chlorite and illite resulting from increasing erosion of the crystalline rocks outcropping in northern areas (e.g. Canadian Shield) developed under glacial climate. The clay minerals identified on the shelf are relatively similar to those deposited on the New Jersey continental slope and rise, and a similar trend in the composition of clay assemblages is... |
| Tipo: Text |
Palavras-chave: Plate-forme; New Jersey; Minéraux argileux; Néogène; Paléoclimat; Shelf; New Jersey; Clay minerals; Neogene; Palaeoclimate. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00325/43575/44043.pdf |
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| Major, Candace O.; Goldstein, Steven L.; Ryan, William B.f.; Lericolais, Gilles; Piotrowski, Alexander M.; Hajdas, Irka. |
| The Black Sea was an inland lake during the last ice age and its sediments are an excellent potential source of information on Eurasian climate change, showing linkages between regionally and globally recognized millennial-scale climate events of the last deglaciation. Here, we detail changes from the last glacial maximum (LGM) through the transition to an anoxic marginal sea using isotopic (strontium and oxygen) and trace element (Sr/Ca) ratios in carbonate shells, which record changing input sources and hydrologic conditions in the basin and surrounding region. Sr isotope records show two prominent peaks between similar to 18 and 16 ka BP cal, reflecting anomalous sedimentation associated with meltwater from disintegrating Eurasian ice sheets that... |
| Tipo: Text |
Palavras-chave: Sea level changes; Black Sea; Deglaciation; Glaciation; Palaeoclimate; Palaeoceanography. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2006.pdf |
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| Lauterbach, Stefan. |
| Sediment records of three European lakes were investigated in order to reconstruct the regional climate development during the Lateglacial and Holocene, to investigate the response of local ecosystems to climatic fluctuations and human impact and to relate regional peculiarities of past climate development to climatic changes on a larger spatial scale. The Lake Hańcza (NE Poland) sediment record was studied with a focus on reconstructing the early Holocene climate development and identifying possible differences to Western Europe. Following the initial Holocene climatic improvement, a further climatic improvement occurred between 10 000 and 9000 cal. a BP. Apparently, relatively cold and dry climate conditions persisted in NE Poland during the first ca.... |
| Tipo: Text |
Palavras-chave: Europe; Holocene; Lateglacial; Lake sediments; Palaeoclimate. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00505/61624/65536.pdf |
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| Banuls-cardona, S.; Lopez-garcia, J. M.; Blain, H. -a.; Lozano-fernandez, I.; Cuenca-bescos, G.. |
| This paper presents a palaeoenvironmental and palaeoclimatic approach to the end of the Last Glacial Maximum (LGM) in the Iberian Peninsula on the basis of the small-mammal assemblages (insectivores, bats and rodents). The LGM is an important period in our climate history defined by the maximum extension of ice sheets between ca. 22 and 19 ka BP. In the Mediterranean region the LGM is characterized by humid conditions, which allow for the development of arboreal vegetation. The small-mammal remains described in this study were recovered from four different sites within the Iberian Peninsula: El Miron cave (Ramales de la Victoria, Cantabria), Valdavara-1 (Becerrea, Lugo), El Portalon (Sierra de Atapuerca, Burgos), and Sala de las Chimeneas (Maltravieso,... |
| Tipo: Text |
Palavras-chave: Microvertebrate; Palaeoenvironment; Palaeoclimate; LGM; Late Pleistocene. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00291/40239/38657.pdf |
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| Nilsson-kerr, Katrina; Anand, Pallavi; Holden, Philip B.; Clemens, Steven C.; Leng, Melanie J.. |
| Most of Earth’s rain falls in the tropics, often in highly seasonal monsoon rains, which are thought to be coupled to the inter-hemispheric migrations of the Inter-Tropical Convergence Zone in response to the seasonal cycle of insolation. Yet characterization of tropical rainfall behaviour in the geologic past is poor. Here we combine new and existing hydroclimate records from six large-scale tropical regions with fully independent model-based rainfall reconstructions across the last interval of sustained warmth and ensuing climate cooling between 130 to 70 thousand years ago (Marine Isotope Stage 5). Our data-model approach reveals large-scale heterogeneous rainfall patterns in response to changes in climate. We note pervasive dipole-like tropical... |
| Tipo: Text |
Palavras-chave: Palaeoceanography; Palaeoclimate. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00685/79705/82497.pdf |
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| Cao, Linglong; Wang, Ping; Wang, Jianhua; Wang, Xiaojing; Yang, Jie. |
| Through the Pearl River Estuary Wan Qing-sha W2 core AMS 14C dating of sediments, combining with paleomagnetic test, pollen analysis, and comprehensive comparison with other relevant records, the regional framework of Holocene age was established. Using the combined feature grain size and magnetic susceptibility proxies for the environment, climate change information in the area since about 6 000 cal yr BP was obtained. The result showed the area since the middle Holocene had experienced three stages climate changes of warm and dry - cool and wet temperature and humidity. South area of China in the late Holocene climate (especially rainfall) had important changes, corresponding to the Northern Hemisphere solar radiation reducing, air temperature... |
| Tipo: Journal Contribution |
Palavras-chave: Grain size; Magnetic susceptibility; Holocene; Palaeoclimate. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/5851 |
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| Registros recuperados: 11 | |
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