Journal of Biogeography (1992) 19, 611-622 The Late Quaternary history of kauri (Agathis australi... more Journal of Biogeography (1992) 19, 611-622 The Late Quaternary history of kauri (Agathis australis) in New Zealand and its climatic significance JOHN OGDEN, ALEX WILSON*, CHRIS Hendy** and REWI M. NEWNHAMt School of Biological Sciences, University of Auckland, ...
Abstract The best means for correcting Southern Hemisphere (SH) radiocarbon measurements, which a... more Abstract The best means for correcting Southern Hemisphere (SH) radiocarbon measurements, which are significantly influenced by temporal variations in the interhemispheric offset, is by the construction of a SH-specific calibration curve from ...
Page 1. Stratigraphy, pollen and 14 C dating of Johnston's Gum Hole, a late Quaternary fossi... more Page 1. Stratigraphy, pollen and 14 C dating of Johnston's Gum Hole, a late Quaternary fossil kauri (Agathis australis) site, Northland, New Zealand DM D'COSTA,1* J. PALMER,2 A. HOGG,3 C. TURNEY,4 LK FIFIELD5 and ...
The Greenland Stadial 1 (GS-1; ~12.9 to 11.65 kyr cal BP) was a period of North Atlantic cooling,... more The Greenland Stadial 1 (GS-1; ~12.9 to 11.65 kyr cal BP) was a period of North Atlantic cooling, thought to have been initiated by North America fresh water runoff that caused a sustained reduction of North Atlantic Meridional Overturning Circulation (AMOC), resulting in an antiphase temperature response between the hemispheres (the 'bipolar seesaw'). Here we exploit sub-fossil New Zealand kauri trees to report the first securely dated, decadally-resolved atmospheric radiocarbon ((14)C) record spanning GS-1. By precisely aligning Southern and Northern Hemisphere tree-ring (14)C records with marine (14)C sequences we document two relatively short periods of AMOC collapse during the stadial, at ~12,920-12,640 cal BP and 12,050-11,900 cal BP. In addition, our data show that the interhemispheric atmospheric (14)C offset was close to zero prior to GS-1, before reaching 'near-modern' values at ~12,660 cal BP, consistent with synchronous recovery of overturning in both hem...
Journal of Biogeography (1992) 19, 611-622 The Late Quaternary history of kauri (Agathis australi... more Journal of Biogeography (1992) 19, 611-622 The Late Quaternary history of kauri (Agathis australis) in New Zealand and its climatic significance JOHN OGDEN, ALEX WILSON*, CHRIS Hendy** and REWI M. NEWNHAMt School of Biological Sciences, University of Auckland, ...
Abstract The best means for correcting Southern Hemisphere (SH) radiocarbon measurements, which a... more Abstract The best means for correcting Southern Hemisphere (SH) radiocarbon measurements, which are significantly influenced by temporal variations in the interhemispheric offset, is by the construction of a SH-specific calibration curve from ...
Page 1. Stratigraphy, pollen and 14 C dating of Johnston's Gum Hole, a late Quaternary fossi... more Page 1. Stratigraphy, pollen and 14 C dating of Johnston's Gum Hole, a late Quaternary fossil kauri (Agathis australis) site, Northland, New Zealand DM D'COSTA,1* J. PALMER,2 A. HOGG,3 C. TURNEY,4 LK FIFIELD5 and ...
The Greenland Stadial 1 (GS-1; ~12.9 to 11.65 kyr cal BP) was a period of North Atlantic cooling,... more The Greenland Stadial 1 (GS-1; ~12.9 to 11.65 kyr cal BP) was a period of North Atlantic cooling, thought to have been initiated by North America fresh water runoff that caused a sustained reduction of North Atlantic Meridional Overturning Circulation (AMOC), resulting in an antiphase temperature response between the hemispheres (the 'bipolar seesaw'). Here we exploit sub-fossil New Zealand kauri trees to report the first securely dated, decadally-resolved atmospheric radiocarbon ((14)C) record spanning GS-1. By precisely aligning Southern and Northern Hemisphere tree-ring (14)C records with marine (14)C sequences we document two relatively short periods of AMOC collapse during the stadial, at ~12,920-12,640 cal BP and 12,050-11,900 cal BP. In addition, our data show that the interhemispheric atmospheric (14)C offset was close to zero prior to GS-1, before reaching 'near-modern' values at ~12,660 cal BP, consistent with synchronous recovery of overturning in both hem...
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Papers by Alan Hogg