| Title | The late Miocene to early Pliocene climate transition in the Southern Ocean |
| Author | Billups, K.; Kelly, C.; Pierce, E. |
| Author Affil | Billups, K., University of Delaware, College of Marine and Earth Studies, Lewes, DE. Other: University of Wisconsin-Madison |
| Source | Palaeogeography, Palaeoclimatology, Palaeoecology, 267(1-2), p.31-40, . Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 |
| Publication Date | Sept. 19, 2008 |
| Notes | In English. 69 refs. Ant. Acc. No: 84845. GeoRef Acc. No: 287800 |
| Index Terms | carbon isotopes; climatic change; geochemical cycles; geochemistry; isotopes; ocean environments; oxygen; paleoclimatology; paleoecology; Ocean Drilling Program--ODP Site 1088; Atlantic Ocean--South Atlantic; Southern Ocean; Atlantic Ocean; biochemistry; C-13/C-12; carbon; carbon cycle; Cenozoic; climate change; Foraminifera; geochemical cycle; Globigerina; Globigerina bulloides; Globigerinacea; Globigerinidae; high- resolution methods; Invertebrata; isotope ratios; Leg 177; lower Pliocene; marine environment; microfossils; Miocene; Neogene; O-18/O-16; Ocean Drilling Program; ODP Site 1088; paleo-oceanography; paleocirculation; Pliocene; Protista; Rotaliina; South Atlantic; stable isotopes; Tertiary; upper Miocene |
| Abstract | We have constructed a relatively high resolution (5-10 kyr) Globigerina bulloides stable isotope record from Ocean Drilling Program Site 1088 (South Atlantic sector of the Southern Ocean). Together with the two published records from the high latitudes of the Southern Hemisphere that each span at least a portion of this interval of time, we begin to assemble a spatial picture of sea surface hydrography during the late Miocene early Pliocene climate transition (~8-3 Ma). We hypothesize that meridional movements in the frontal zones (Polar Front and Subtropical Convergence) with their impact on hydrographic gradients would be evident in temporal changes in the planktonic foraminiferal stable isotopic gradients among the sites. Our results indicate that there were no large changes in delta 18O gradients during the interval of study. Relatively small changes such as a gradual warming of about 3-4°C at Site 1088 during the late Miocene fall well within the realm of modern ocean seasonality in this region. (mod. journ. abst.) |
| URL | http://hdl.handle.net/10.1016/j.palaeo.2008.05.013 |
| Publication Type | journal article |
| Record ID | 63000515 |