Holocene climate in the Atlantic sector of the Southern Ocean: Controlled by insolation or oceanic circulation?

• Published in: Geology
• Main Authors: Nielsen Nalâ, Simon, Crosta, Xavier, Nielsen, Simon H.H., Koç, Nalân
• Other Authors: Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2004
• Subjects: insolation; Antarctic Polar Front; Holocene; modern analog technique; Southern Ocean; paleoclimate; diatoms; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology; Antarctic; Antarctic Peninsula; Block Lake; Byrd; Dominion Range; Drake Passage; East Antarctica; Law Dome; Patagonia; Ross Sea; Taylor Dome; Antarc*; Antarctica; Sea ice
• Online Access: https://hal.archives-ouvertes.fr/hal-02105699; https://doi.org/10.1130/G20334.1

International audience Figure 1. Locality of TN057-17 site and other sites with data presented here. 1-TN057-13PC4 (Hodell et al., 2001). 2-Block Lake, South Georgia (Rosqvist and Schubert, 2003). 3-GeoB3313-1 (Lamy et al., 2002). 4-Ocean Drilling Program Leg 178, Site 1098C (Do-mack et al., 2001). Sites 5-15 are ice cores from Masson et al. (2000), and sites 5-7 are Ross Sea sector cores: 5-Byrd Dome; 6-Taylor Dome; 7-Dominion Range; 8-Plateau Remote; 9-D47; 10-KM105. Sites 11-15 are East Antarctic sector cores: 11-Dome B; 12-Komsomolskaya; 13-Vostok; 14-Dome C; 15-Law Dome. Stars mark records with positive correlation to late Holocene TN057-17 sea-surface temperature. Circles are sites with negative correlation to same. Winter sea-ice extent and Antarctic Polar Front from Orsi et al. (1995) and L.H. Burckle (2001, personal commun.). ABSTRACT The Holocene climate of the Southern Ocean is not well understood , mainly because of the lack of high-resolution reconstructions of ocean surface properties. Here we present a 12,500-yr-long, decadal-scale record of Holocene sea-surface temperatures and sea-ice presence from the Polar Front of the East Atlantic Southern Ocean. The record shows gradual climate change, with no abrupt Neoglacial cooling, and an unprecedented late Holocene warming. The dominant forcing factor appears to be precessional insolation; Northern Hemisphere summer insolation correlates to at least the early to middle Holocene climate trend. Spectral analysis reveals centennial-scale cyclic climate changes with periods of 1220, 1070, 400, and 150 yr. The record shows good correlation to East Antarctic ice cores and to climate records from South Georgia and Bunger Oasis. However, the record shows out-of-phase behavior with regard to climate records from the western Antarctic Peninsula and the Peru-Chile Current; such behavior hints at a climatic divide through Patagonia, the Drake Passage, and between West and East Antarctica.