Age determination, stable carbon, and hydrogen isotope composition of n-alkanes from Mfabeni peatland
The scarcity of continuous, terrestrial, palaeoenvironmental records in eastern South Africa leaves the evolution of late Quaternary climate and its driving mechanisms uncertain. Here we use a ∼7 m long core from Mfabeni peatland (KwaZulu-Natal, South Africa) to reconstruct climate variability for t...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.903032 2023-05-15T14:04:57+02:00 Age determination, stable carbon, and hydrogen isotope composition of n-alkanes from Mfabeni peatland Miller, Charlotte Finch, Jemma M Hill, Trevor Peterse, Francien Humphries, Marc Zabel, Matthias Schefuß, Enno LATITUDE: -28.152250 * LONGITUDE: 32.519278 2019-06-27 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.903032 https://doi.org/10.1594/PANGAEA.903032 en eng PANGAEA Miller, Charlotte; Finch, Jemma M; Hill, Trevor; Peterse, Francien; Humphries, Marc; Zabel, Matthias; Schefuß, Enno (2019): Late Quaternary climate variability at Mfabeni peatland, eastern South Africa. Climate of the Past, 15(3), 1153-1170, https://doi.org/10.5194/cp-15-1153-2019 https://doi.pangaea.de/10.1594/PANGAEA.903032 https://doi.org/10.1594/PANGAEA.903032 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Dataset 2019 ftpangaea https://doi.org/10.1594/PANGAEA.903032 https://doi.org/10.5194/cp-15-1153-2019 2023-01-20T07:34:21Z The scarcity of continuous, terrestrial, palaeoenvironmental records in eastern South Africa leaves the evolution of late Quaternary climate and its driving mechanisms uncertain. Here we use a ∼7 m long core from Mfabeni peatland (KwaZulu-Natal, South Africa) to reconstruct climate variability for the last 32 000 years (cal ka BP). We infer past vegetation and hydrological variability using stable carbon (δ13Cwax) and hydrogen isotopes (δDwax) of plant-wax n-alkanes and use Paq to reconstruct water table changes. Our results indicate that late Quaternary climate in eastern South Africa did not respond directly to orbital forcing or to changes in sea-surface temperatures (SSTs) in the western Indian Ocean. We attribute the arid conditions evidenced at Mfabeni during the Last Glacial Maximum (LGM) to low SSTs and an equatorward displacement of (i) the Southern Hemisphere westerlies, (ii) the subtropical high-pressure cell, and (iii) the South Indian Ocean Convergence Zone (SIOCZ), which we infer was linked to increased Antarctic sea-ice extent. The northerly location of the high-pressure cell and the SIOCZ inhibited moisture advection inland and pushed the rain-bearing cloud band north of Mfabeni, respectively. The increased humidity at Mfabeni between 19 and 14 cal kyr BP likely resulted from a southward retreat of the westerlies, the high-pressure cell, and the SIOCZ, consistent with a decrease in Antarctic sea-ice extent. Between 14 and 5 cal kyr BP, when the westerlies, the high-pressure cell, and the SIOCZ were in their southernmost position, local insolation became the dominant control, leading to stronger atmospheric convection and an enhanced tropical easterly monsoon. Generally drier conditions persisted during the past ca. 5 cal ka BP, probably resulting from an equatorward return of the westerlies, the high-pressure cell, and the SIOCZ. Higher SSTs and heightened El Niño–Southern Oscillation (ENSO) activity may have played a role in enhancing climatic variability during the past ca. 5 cal ka BP. Our ... Dataset Antarc* Antarctic Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Indian ENVELOPE(32.519278,32.519278,-28.152250,-28.152250) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
The scarcity of continuous, terrestrial, palaeoenvironmental records in eastern South Africa leaves the evolution of late Quaternary climate and its driving mechanisms uncertain. Here we use a ∼7 m long core from Mfabeni peatland (KwaZulu-Natal, South Africa) to reconstruct climate variability for the last 32 000 years (cal ka BP). We infer past vegetation and hydrological variability using stable carbon (δ13Cwax) and hydrogen isotopes (δDwax) of plant-wax n-alkanes and use Paq to reconstruct water table changes. Our results indicate that late Quaternary climate in eastern South Africa did not respond directly to orbital forcing or to changes in sea-surface temperatures (SSTs) in the western Indian Ocean. We attribute the arid conditions evidenced at Mfabeni during the Last Glacial Maximum (LGM) to low SSTs and an equatorward displacement of (i) the Southern Hemisphere westerlies, (ii) the subtropical high-pressure cell, and (iii) the South Indian Ocean Convergence Zone (SIOCZ), which we infer was linked to increased Antarctic sea-ice extent. The northerly location of the high-pressure cell and the SIOCZ inhibited moisture advection inland and pushed the rain-bearing cloud band north of Mfabeni, respectively. The increased humidity at Mfabeni between 19 and 14 cal kyr BP likely resulted from a southward retreat of the westerlies, the high-pressure cell, and the SIOCZ, consistent with a decrease in Antarctic sea-ice extent. Between 14 and 5 cal kyr BP, when the westerlies, the high-pressure cell, and the SIOCZ were in their southernmost position, local insolation became the dominant control, leading to stronger atmospheric convection and an enhanced tropical easterly monsoon. Generally drier conditions persisted during the past ca. 5 cal ka BP, probably resulting from an equatorward return of the westerlies, the high-pressure cell, and the SIOCZ. Higher SSTs and heightened El Niño–Southern Oscillation (ENSO) activity may have played a role in enhancing climatic variability during the past ca. 5 cal ka BP. Our ... |
format |
Dataset |
author |
Miller, Charlotte Finch, Jemma M Hill, Trevor Peterse, Francien Humphries, Marc Zabel, Matthias Schefuß, Enno |
spellingShingle |
Miller, Charlotte Finch, Jemma M Hill, Trevor Peterse, Francien Humphries, Marc Zabel, Matthias Schefuß, Enno Age determination, stable carbon, and hydrogen isotope composition of n-alkanes from Mfabeni peatland |
author_facet |
Miller, Charlotte Finch, Jemma M Hill, Trevor Peterse, Francien Humphries, Marc Zabel, Matthias Schefuß, Enno |
author_sort |
Miller, Charlotte |
title |
Age determination, stable carbon, and hydrogen isotope composition of n-alkanes from Mfabeni peatland |
title_short |
Age determination, stable carbon, and hydrogen isotope composition of n-alkanes from Mfabeni peatland |
title_full |
Age determination, stable carbon, and hydrogen isotope composition of n-alkanes from Mfabeni peatland |
title_fullStr |
Age determination, stable carbon, and hydrogen isotope composition of n-alkanes from Mfabeni peatland |
title_full_unstemmed |
Age determination, stable carbon, and hydrogen isotope composition of n-alkanes from Mfabeni peatland |
title_sort |
age determination, stable carbon, and hydrogen isotope composition of n-alkanes from mfabeni peatland |
publisher |
PANGAEA |
publishDate |
2019 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.903032 https://doi.org/10.1594/PANGAEA.903032 |
op_coverage |
LATITUDE: -28.152250 * LONGITUDE: 32.519278 |
long_lat |
ENVELOPE(32.519278,32.519278,-28.152250,-28.152250) |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
Miller, Charlotte; Finch, Jemma M; Hill, Trevor; Peterse, Francien; Humphries, Marc; Zabel, Matthias; Schefuß, Enno (2019): Late Quaternary climate variability at Mfabeni peatland, eastern South Africa. Climate of the Past, 15(3), 1153-1170, https://doi.org/10.5194/cp-15-1153-2019 https://doi.pangaea.de/10.1594/PANGAEA.903032 https://doi.org/10.1594/PANGAEA.903032 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.903032 https://doi.org/10.5194/cp-15-1153-2019 |
_version_ |
1766276413074178048 |