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Papers by Alan Hogg

Research paper thumbnail of The Late Quaternary History of Kauri (Agathis australis) in New Zealand and Its Climatic Significance

Journal of Biogeography, 1992

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, ...

Research paper thumbnail of Gas chromatographic analysis of the free amino acid pool of the potato and gas chromatography-mass spectrometry identification of .gamma.-aminobutyric acid and ornithine

Research paper thumbnail of The first accurate and precise calendar dating of New Zealand Māori Pā, using Otāhau Pā as a case study

Journal of Archaeological Science: Reports, 2017

Research paper thumbnail of Geological subsidence and sinking islands: The case of Manono (Samoa)

Archaeology in Oceania, 2016

Research paper thumbnail of Towards Achieving Low Background Levels in Routine Dating by Liquid Scintillation Spectrometry

Research paper thumbnail of Decadally Resolved Lateglacial Radiocarbon Evidence from New Zealand Kauri–CORRIGENDUM

Research paper thumbnail of When was the Taupo eruption?

Quaternary International, 2012

Research paper thumbnail of Evidence for Late Polynesian Colonization of New Zealand: University of Waikato Radiocarbon Measurements

Research paper thumbnail of High-Precision Radiocarbon Measurements of Tree-Ring Dated Wood from New Zealand: 195 Bc–Ad 995

Radiocarbon, 2011

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 ...

Research paper thumbnail of Intcal04 Terrestrial Radiocarbon Age Calibration, 0–26 Cal Kyr BP

Research paper thumbnail of Investigating the Interhemispheric 14C Offset in the 1st Millennium AD and Assessment of Laboratory Bias and Calibration Errors

Research paper thumbnail of Bayesian Evaluation of the Southern Hemisphere Radiocarbon Offset during the Holocene

Research paper thumbnail of Age of the Rotoehu Ash. Comment

Research paper thumbnail of Stratigraphy, pollen and14C dating of Johnston's Gum Hole, a late Quaternary fossil kauri (Agathis australis) site, Northland, New Zealand

J Quaternary Sci, 2009

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 ...

Research paper thumbnail of New Marine ΔR Values for the South Pacific Subtropical Gyre Region

Research paper thumbnail of Revised calendar date for the Taupo eruption derived by ¹⁴C wiggle-matching using a New Zealand kauri ¹⁴C calibration data set

Research paper thumbnail of Re-anchoring the late Pleistocene tephrochronology of New Zealand based on concordant radiocarbon ages and combined ²³⁸U/ ²³ºTh disequilibrium and (U-Th)/He zircon ages

Research paper thumbnail of Anomalous mid-twentieth century atmospheric circulation change over the South Atlantic compared to the last 6000 years

Environmental Research Letters, 2016

Research paper thumbnail of Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1

Scientific reports, Jan 19, 2016

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...

Research paper thumbnail of Age of the Rotoehu Ash

New Zealand Journal of Geology and Geophysics, 1995

Research paper thumbnail of The Late Quaternary History of Kauri (Agathis australis) in New Zealand and Its Climatic Significance

Journal of Biogeography, 1992

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, ...

Research paper thumbnail of Gas chromatographic analysis of the free amino acid pool of the potato and gas chromatography-mass spectrometry identification of .gamma.-aminobutyric acid and ornithine

Research paper thumbnail of The first accurate and precise calendar dating of New Zealand Māori Pā, using Otāhau Pā as a case study

Journal of Archaeological Science: Reports, 2017

Research paper thumbnail of Geological subsidence and sinking islands: The case of Manono (Samoa)

Archaeology in Oceania, 2016

Research paper thumbnail of Towards Achieving Low Background Levels in Routine Dating by Liquid Scintillation Spectrometry

Research paper thumbnail of Decadally Resolved Lateglacial Radiocarbon Evidence from New Zealand Kauri–CORRIGENDUM

Research paper thumbnail of When was the Taupo eruption?

Quaternary International, 2012

Research paper thumbnail of Evidence for Late Polynesian Colonization of New Zealand: University of Waikato Radiocarbon Measurements

Research paper thumbnail of High-Precision Radiocarbon Measurements of Tree-Ring Dated Wood from New Zealand: 195 Bc–Ad 995

Radiocarbon, 2011

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 ...

Research paper thumbnail of Intcal04 Terrestrial Radiocarbon Age Calibration, 0–26 Cal Kyr BP

Research paper thumbnail of Investigating the Interhemispheric 14C Offset in the 1st Millennium AD and Assessment of Laboratory Bias and Calibration Errors

Research paper thumbnail of Bayesian Evaluation of the Southern Hemisphere Radiocarbon Offset during the Holocene

Research paper thumbnail of Age of the Rotoehu Ash. Comment

Research paper thumbnail of Stratigraphy, pollen and14C dating of Johnston's Gum Hole, a late Quaternary fossil kauri (Agathis australis) site, Northland, New Zealand

J Quaternary Sci, 2009

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 ...

Research paper thumbnail of New Marine ΔR Values for the South Pacific Subtropical Gyre Region

Research paper thumbnail of Revised calendar date for the Taupo eruption derived by ¹⁴C wiggle-matching using a New Zealand kauri ¹⁴C calibration data set

Research paper thumbnail of Re-anchoring the late Pleistocene tephrochronology of New Zealand based on concordant radiocarbon ages and combined ²³⁸U/ ²³ºTh disequilibrium and (U-Th)/He zircon ages

Research paper thumbnail of Anomalous mid-twentieth century atmospheric circulation change over the South Atlantic compared to the last 6000 years

Environmental Research Letters, 2016

Research paper thumbnail of Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1

Scientific reports, Jan 19, 2016

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...

Research paper thumbnail of Age of the Rotoehu Ash

New Zealand Journal of Geology and Geophysics, 1995

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