Relation between low latitude insolation and δ 18 O change of atmospheric oxygen for the last 200 kyrs, as revealed by Mediterranean sapropels
| Autor: | M. Rossignol-Strick, B. Malaizé, M.-A. Mélières |
|---|---|
| Přispěvatelé: | Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Modélisation du Climat et de l'Environnement (LMCE) |
| Jazyk: | angličtina |
| Rok vydání: | 1997 |
| Předmět: |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere 010506 paleontology 010504 meteorology & atmospheric sciences δ18O Sapropel 15. Life on land Atmospheric sciences 01 natural sciences Geophysics Mediterranean sea Oceanography Ice core 13. Climate action Interglacial Paleoclimatology General Earth and Planetary Sciences Glacial period Water cycle [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Geology 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters Geophysical Research Letters, American Geophysical Union, 1997, 24 (10), pp.1235-1238. ⟨10.1029/97GL01025⟩ |
| ISSN: | 0094-8276 1944-8007 |
| DOI: | 10.1029/97GL01025⟩ |
| Popis: | International audience; The isotopic ratio of atmospheric O2, δ18Oatm, deduced from ice cores, displays large fluctuations during climatic cycles. These are caused principally by changes in the oxygen isotopic ratio of sea-water, δ18Osw, and changes in the biosphere and in the hydrological cycle. As both δ18Oatm and δ18Osw coincide closely over the last 135 kyr BP, it is generally believed that δ18Oatm is driven mainly by δ18Osw. Here we focus on the major discrepancy, which arises between those two signals during the prior isotopic glacial stage 6, around 175 kyr BP, discrepancy which calls into question the role of changes in δ18Osw as the driving mechanism for δ18Oatm. We present arguments, based on the occurrence and pollen content of Mediterranean sapropels, for another source of the δ18Oatm change: insolation at low latitudes via hydrosphere/biosphere activity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text