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Article Dans Une Revue Geology Année : 2004

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

Simon H H Nielsen Nalâ
  • Fonction : Auteur
Xavier Crosta
Simon H.H. Nielsen
  • Fonction : Auteur
Nalân Koç
  • Fonction : Auteur

Résumé

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.
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Dates et versions

hal-02105699 , version 1 (23-04-2019)

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Simon H H Nielsen Nalâ, Xavier Crosta, Simon H.H. Nielsen, Nalân Koç. Holocene climate in the Atlantic sector of the Southern Ocean: Controlled by insolation or oceanic circulation?. Geology, 2004, 32 (4), pp.317. ⟨10.1130/G20334.1⟩. ⟨hal-02105699⟩

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