Consulta: subjectFacets:"Planktic foraminifers"
Registros recuperados: 2
Data/hora: 13/06/2024 00:41:04

A "critical" climatic evaluation of last interglacial (MIS 5e) records from the Norwegian Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bauch, Henning A.; Erlenkeuser, Helmut.
Sediment cores from the Norwegian Sea were studied to evaluate interglacial climate conditions of the marine isotope stage 5e (MIS 5e). Using planktic forminiferal assemblages as the core method, a detailed picture of the evolution of surface water conditions was derived. According to our age model, a step-like deglaciation of the Saalian ice sheets is noted between ca. 135 and 124.5 Kya, but the deglaciation shows little response with regard to surface ocean warming. From then on, the rapidly increasing abundance of subpolar forminifers, concomitant with decreasing iceberg indicators, provides evidence for the development of interglacial conditions sensu stricto (5e-ss), a period that lasted for about 9 Ky. As interpreted from the foraminiferal records,...
Tipo: Text
Palavras-chave: Holocene; Last interglacial; Nordic seas; Palaeoceanography; Planktic foraminifers; Stable isotopes.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00237/34811/33316.pdf

A 0.55-Ma paleotemperature record from the Subantarctic zone: Implications for Antarctic Circumpolar Current development
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Becquey, S; Gersonde, R.
Estimates of summer sea surface temperatures (SSSTs) derived from planktic foraminiferal associations using the Modern Analog Technique and combined with isotopic analyses and determination of ice-rafted debris, mirror the Pleistocene evolution of the planktic Subantarctic surface waters in the Atlantic Ocean. The SSSTs indicate that the isotherms that define the modern polar front zone and Subantarctic front, were located at more northerly latitudes (up to 7degrees) during most of the investigated period, which covers the past 550 kyr. Exceptions are during climatic optima in the early Holocene, at marine isotope stages (MIS) 5.5, 7.1, 7.5, 9.3, and presumably during MIS 11.3 when SSSTs exceeded modern values by 1degrees-5degreesC. The close similarity...
Tipo: Text
Palavras-chave: Subantarctic zone; Sea surface temperatures; Planktic foraminifers; Ice rafted debris; Climate.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/00224/33501/31947.pdf