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A Holocene peat record in the central South Atlantic: an archive of precipitation changes

Lindvall, Hanna; Björck, Svante LU ; Holmgren, Sofia LU ; Ljung, Karl LU ; Van der Putten, Nathalie LU and Porter, Charles (2011) In GFF 133(3-4). p.195-206
Abstract
Peat deposits from the littoral part of the wetland 2nd Pond on Nightingale Island in the central South Atlantic have been analysed to investigate the Holocene climate development on the island and to test a hypothesis about regionally persistent humidity variations. A variety of proxies were analysed - total carbon and nitrogen, biogenic silica, diatoms, amount of organic matter, macrofossils and magnetic susceptibility - and together with the lithology they are interpreted as a record reflecting changes in humidity/precipitation. Early Holocene (10,000-8500 cal. BP) was possibly significantly drier than today, probably caused by a southerly displacement of the Southern Hemisphere Westerlies (SHW) during the Antarctic climate optimum.... (More)
Peat deposits from the littoral part of the wetland 2nd Pond on Nightingale Island in the central South Atlantic have been analysed to investigate the Holocene climate development on the island and to test a hypothesis about regionally persistent humidity variations. A variety of proxies were analysed - total carbon and nitrogen, biogenic silica, diatoms, amount of organic matter, macrofossils and magnetic susceptibility - and together with the lithology they are interpreted as a record reflecting changes in humidity/precipitation. Early Holocene (10,000-8500 cal. BP) was possibly significantly drier than today, probably caused by a southerly displacement of the Southern Hemisphere Westerlies (SHW) during the Antarctic climate optimum. From 8500 cal. BP and onwards, the climate became generally more humid and surface run-off increased due to higher precipitation, possibly as an effect of increased influence from the SHW as it moved north. During this generally humid period, our data disclose a distinct pattern of recurrent centennial- to millennial-long events of increased precipitation and the results corroborate the only other study in the region with a similar humidity record. The events might represent large-scale climate oscillations in the Southern Hemisphere, such as latitudinal shifts of the SHW, but may also be related to changes in sea surface temperatures. (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
South Atlantic Ocean, Nightingale Island, Holocene, peat
in
GFF
volume
133
issue
3-4
pages
195 - 206
publisher
Geological Society of Sweden
external identifiers
  • wos:000299035100007
  • scopus:84859051104
ISSN
2000-0863
DOI
10.1080/11035897.2011.633708
project
MERGE
language
English
LU publication?
yes
id
cf739592-80e1-461f-99b5-67fede2e6881 (old id 2494289)
date added to LUP
2012-06-04 14:22:28
date last changed
2017-01-01 03:54:32
@article{cf739592-80e1-461f-99b5-67fede2e6881,
  abstract     = {Peat deposits from the littoral part of the wetland 2nd Pond on Nightingale Island in the central South Atlantic have been analysed to investigate the Holocene climate development on the island and to test a hypothesis about regionally persistent humidity variations. A variety of proxies were analysed - total carbon and nitrogen, biogenic silica, diatoms, amount of organic matter, macrofossils and magnetic susceptibility - and together with the lithology they are interpreted as a record reflecting changes in humidity/precipitation. Early Holocene (10,000-8500 cal. BP) was possibly significantly drier than today, probably caused by a southerly displacement of the Southern Hemisphere Westerlies (SHW) during the Antarctic climate optimum. From 8500 cal. BP and onwards, the climate became generally more humid and surface run-off increased due to higher precipitation, possibly as an effect of increased influence from the SHW as it moved north. During this generally humid period, our data disclose a distinct pattern of recurrent centennial- to millennial-long events of increased precipitation and the results corroborate the only other study in the region with a similar humidity record. The events might represent large-scale climate oscillations in the Southern Hemisphere, such as latitudinal shifts of the SHW, but may also be related to changes in sea surface temperatures.},
  author       = {Lindvall, Hanna and Björck, Svante and Holmgren, Sofia and Ljung, Karl and Van der Putten, Nathalie and Porter, Charles},
  issn         = {2000-0863},
  keyword      = {South Atlantic Ocean,Nightingale Island,Holocene,peat},
  language     = {eng},
  number       = {3-4},
  pages        = {195--206},
  publisher    = {Geological Society of Sweden},
  series       = {GFF},
  title        = {A Holocene peat record in the central South Atlantic: an archive of precipitation changes},
  url          = {http://dx.doi.org/10.1080/11035897.2011.633708},
  volume       = {133},
  year         = {2011},
}