Advanced

A late glacial Antarctic climate teleconnection and variable Holocene seasonality at Lake Pupuke, Auckland, New Zealand

Stephens, Thomas; Atkin, Daniel; Augustinus, Paul; Shane, Philip; Lorrey, Andrew; Street-Perrott, Alayne; Nilsson, Andreas LU and Snowball, Ian LU (2012) In Journal of Paleolimnology 48(4). p.785-800
Abstract
We present the first continuous paleolimnological reconstruction from the North Island of New Zealand (37A degrees S) that spans the last 48.2 cal kyr. A tephra- and radiocarbon-based chronology was developed to infer the timing of marked paleolimnological changes in Lake Pupuke, Auckland, New Zealand, identified using sedimentology, magnetic susceptibility, grain size and geochemistry (carbon, nitrogen and sulphur concentrations and fluxes, carbon and nitrogen stable isotopes). Variable erosional influx, biomass and benthic REDOX conditions are linked to changing effective precipitation and seasonality within three inferred broad intervals of climatic change: (1) the Last Glacial Coldest Phase (LGCP) of reduced effective precipitation and... (More)
We present the first continuous paleolimnological reconstruction from the North Island of New Zealand (37A degrees S) that spans the last 48.2 cal kyr. A tephra- and radiocarbon-based chronology was developed to infer the timing of marked paleolimnological changes in Lake Pupuke, Auckland, New Zealand, identified using sedimentology, magnetic susceptibility, grain size and geochemistry (carbon, nitrogen and sulphur concentrations and fluxes, carbon and nitrogen stable isotopes). Variable erosional influx, biomass and benthic REDOX conditions are linked to changing effective precipitation and seasonality within three inferred broad intervals of climatic change: (1) the Last Glacial Coldest Phase (LGCP) of reduced effective precipitation and cooler temperatures, from 28.8 to 18.0 cal kyr BP, (2) the Last Glacial Interglacial Transition (LGIT) of increasing effective precipitation and warmer conditions, from 18.0 to 10.2 cal kyr BP, and (3) a Holocene interval of high effective precipitation, beginning with a warm period of limited seasonality from 10.2 cal kyr BP and followed by increasing seasonality from 7.6 cal kyr BP. The LGCP and LGIT also contain millennial-scale climate events, including the coldest inferred glacial conditions during the LGCP from 27.8 to 26.0 and 22.0-19.0 cal kyr BP, and a climate reversal in the LGIT associated with lower lake level, from 14.5 to 13.8 cal kyr BP, coeval with the Antarctic Cold Reversal. The onset of seasonal thermal stratification occurred at 5.7 cal kyr BP and was linked to natural eutrophication of Lake Pupuke, which produced enhanced organic sedimentation. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Climate and environmental change, Antarctic teleconnection, Seasonality, Elemental flux, Stable isotope, Erosion, Biological productivity, Mixing
in
Journal of Paleolimnology
volume
48
issue
4
pages
785 - 800
publisher
Springer
external identifiers
  • wos:000311395000008
  • scopus:84869879665
ISSN
0921-2728
DOI
10.1007/s10933-012-9644-z
language
English
LU publication?
yes
id
832cf1db-f7f0-46c4-a007-645c938d81f4 (old id 3243093)
date added to LUP
2012-12-28 10:33:26
date last changed
2017-09-24 04:07:23
@article{832cf1db-f7f0-46c4-a007-645c938d81f4,
  abstract     = {We present the first continuous paleolimnological reconstruction from the North Island of New Zealand (37A degrees S) that spans the last 48.2 cal kyr. A tephra- and radiocarbon-based chronology was developed to infer the timing of marked paleolimnological changes in Lake Pupuke, Auckland, New Zealand, identified using sedimentology, magnetic susceptibility, grain size and geochemistry (carbon, nitrogen and sulphur concentrations and fluxes, carbon and nitrogen stable isotopes). Variable erosional influx, biomass and benthic REDOX conditions are linked to changing effective precipitation and seasonality within three inferred broad intervals of climatic change: (1) the Last Glacial Coldest Phase (LGCP) of reduced effective precipitation and cooler temperatures, from 28.8 to 18.0 cal kyr BP, (2) the Last Glacial Interglacial Transition (LGIT) of increasing effective precipitation and warmer conditions, from 18.0 to 10.2 cal kyr BP, and (3) a Holocene interval of high effective precipitation, beginning with a warm period of limited seasonality from 10.2 cal kyr BP and followed by increasing seasonality from 7.6 cal kyr BP. The LGCP and LGIT also contain millennial-scale climate events, including the coldest inferred glacial conditions during the LGCP from 27.8 to 26.0 and 22.0-19.0 cal kyr BP, and a climate reversal in the LGIT associated with lower lake level, from 14.5 to 13.8 cal kyr BP, coeval with the Antarctic Cold Reversal. The onset of seasonal thermal stratification occurred at 5.7 cal kyr BP and was linked to natural eutrophication of Lake Pupuke, which produced enhanced organic sedimentation.},
  author       = {Stephens, Thomas and Atkin, Daniel and Augustinus, Paul and Shane, Philip and Lorrey, Andrew and Street-Perrott, Alayne and Nilsson, Andreas and Snowball, Ian},
  issn         = {0921-2728},
  keyword      = {Climate and environmental change,Antarctic teleconnection,Seasonality,Elemental flux,Stable isotope,Erosion,Biological productivity,Mixing},
  language     = {eng},
  number       = {4},
  pages        = {785--800},
  publisher    = {Springer},
  series       = {Journal of Paleolimnology},
  title        = {A late glacial Antarctic climate teleconnection and variable Holocene seasonality at Lake Pupuke, Auckland, New Zealand},
  url          = {http://dx.doi.org/10.1007/s10933-012-9644-z},
  volume       = {48},
  year         = {2012},
}