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Alan G. Hogg
University of Waikato
17Publications
17H-index
12.3kCitations
Publications 17
Newest
#1Marcus J. Vandergoes (UMaine: University of Maine)H-Index: 25
#2Alan G. Hogg (University of Waikato)H-Index: 17
Last.Maarten Blaauw ('QUB': Queen's University Belfast)H-Index: 37
view all 15 authors...
Abstract The Kawakawa/Oruanui tephra (KOT) is a key chronostratigraphic marker in terrestrial and marine deposits of the New Zealand (NZ) sector of the southwest Pacific. Erupted early during the Last Glacial Maximum (LGM), the wide distribution of the KOT enables inter-regional alignment of proxy records and facilitates comparison between NZ climatic variations and those from well-dated records elsewhere. We present 22 new radiocarbon ages for the KOT from sites and materials considered optimal...
106 CitationsSource
#1Alan G. Hogg (University of Waikato)H-Index: 17
#2Quan Hua (ANSTO: Australian Nuclear Science and Technology Organisation)H-Index: 32
Last.Susan H. Zimmerman (LLNL: Lawrence Livermore National Laboratory)H-Index: 12
view all 12 authors...
The Southern Hemisphere SHCal04 radiocarbon calibration curve has been updated with the addition of new data sets extending measurements to 2145 cal BP and including the ANSTO Younger Dryas Huon pine data set. Outside the range of measured data, the curve is based upon the Northern Hemisphere data sets as presented in IntCal13, with an interhemispheric offset averaging 43 ± 23 yr modeled by an autoregressive process to represent the short-term correlations in the offset. DOI: 10.2458/azu_js_rc.5...
932 CitationsSource
#1Paula J. Reimer ('QUB': Queen's University Belfast)H-Index: 40
#2Edouard Bard (AMU: Aix-Marseille University)H-Index: 73
Last.J. van der Plicht (LEI: Leiden University)H-Index: 53
view all 27 authors...
High-quality data from appropriate archives are needed for the continuing improvement of radiocarbon cali- bration curves. We discuss here the basic assumptions behind 14C dating that necessitate calibration and the relative strengths and weaknesses of archives from which calibration data are obtained. We also highlight the procedures, problems, and uncer- tainties involved in determining atmospheric and surface ocean 14C/12C in these archives, including a discussion of the vari- ous methods use...
56 CitationsSource
#1Martin Danišík (University of Waikato)H-Index: 22
#2Phil Shane (University of Auckland)H-Index: 32
Last.Jan M. Lindsay (University of Auckland)H-Index: 25
view all 9 authors...
Abstract The caldera-forming Rotoiti eruption from Okataina volcano was one of the largest rhyolite events of the last 100 ka in the Taupo Volcanic Zone, New Zealand. Its associated widespread tephra layer (Rotoehu tephra) is a significant time marker in terrestrial–marine paleoclimate correlation studies in the SW Pacific. However, the accurate and precise age of this eruption, and of the subsequent, smaller volume Earthquake Flat (EQF) eruption, has been the subject of controversy despite nume...
64 CitationsSource
#1Alan G. Hogg (University of Waikato)H-Index: 17
#2David J. Lowe (University of Waikato)H-Index: 41
Last.Christopher Bronk RamseyH-Index: 49
view all 5 authors...
Taupo volcano in central North Island, New Zealand, is the most frequently active and productive rhyolite volcano on Earth. Its latest explosive activity about 1800 years ago generated the spectacular Taupo eruption, the most violent eruption known in the world in the last 5000 years. We present here a new accurate and precise eruption date of ad 232 ± 5 (1718 ± 5 cal. BP) for the Taupo event. This date was derived by wiggle-matching 25 high-precision 14C dates from decadal samples of Phylloclad...
67 CitationsSource
#1Paula J. Reimer ('QUB': Queen's University Belfast)H-Index: 40
#2Edouard Bard (Collège de France)H-Index: 73
Last.J. van der Plicht (UG: University of Groningen)H-Index: 53
view all 30 authors...
Additional co-authors: TJ Heaton, AG Hogg, KA Hughen, KF Kaiser, B Kromer, SW Manning, RW Reimer, DA Richards, JR Southon, S Talamo, CSM Turney, J van der Plicht, CE Weyhenmeyer
9,552 CitationsSource
#1Marcus J. Vandergoes (UMaine: University of Maine)H-Index: 25
#2Rewi M. Newnham (Plymouth University)H-Index: 41
Last.Christian Schlüchter (University of Bern)H-Index: 42
view all 9 authors...
Southern New Zealand, positioned within the important southwesterly wind system, is a prime site for examining interhemispheric linkages in climate change. A series of cores drilled in the Okarito Pakihi peat bog now provides a continuous record of vegetation and climate change that may become a benchmark for the region. The data include clear evidence for modification of the global climate change signal in the Southern Hemisphere by local variation in the intensity of solar radiation. In agreem...
109 CitationsSource
#1F. G. McCormacH-Index: 22
#2Alan G. HoggH-Index: 17
Last.Paula J. ReimerH-Index: 40
view all 6 authors...
Recent measurements on dendrochronologically-dated wood from the Southern Hemisphere have shown that there are differences between the structural form of the radiocarbon calibration curves from each hemisphere. Thus, it is desirable, when possible, to use calibration data obtained from secure dendrochronologically-dated wood from the corresponding hemisphere. In this paper, we outline the recent work and point the reader to the internationally recommended data set that should be used for future ...
828 CitationsSource
#1Alan G. Hogg (University of Waikato)H-Index: 17
#2Thomas Higham (University of Oxford)H-Index: 61
Last.Rewi M. Newnham (Plymouth University)H-Index: 41
view all 6 authors...
Dating initial colonisation and environmental impacts by Polynesians in New Zealand is controversial. A key horizon is provided by the Kaharoa Tephra, deposited from an eruption of Mt Tarawera, because just underneath this layer are the first signs of forest clearance which imply human settlement. The authors used a log of celery pine from within Kaharoa deposits to derive a new precise date for the eruption via “wiggle-matching” – matching the radiocarbon dates of a sequence of samples from the...
110 CitationsSource
#1Alan G. HoggH-Index: 17
#2F. G. McCormacH-Index: 22
Last.Jonathan G. PalmerH-Index: 36
view all 6 authors...
The University of Waikato, Hamilton, New Zealand and The Queen's University of Belfast, Northern Ireland radiocarbon dating laboratories have undertaken a series of high-precision measurements on decadal samples of dendrochronologically dated oak (Quercus petraea) from Great Britain and cedar (Libocedrus bidwillii) and silver pine (Lagarostrobos colensoi) from New Zealand. The results show an average hemispheric offset over the 900 yr of measurement of 40+ or -13 yr. This value is not constant b...
72 CitationsSource
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