Late Quateranry dinoflagellate cysts of ODP Site 202-1233
The late Quaternary organic-walled dinoflagellate cyst record of Site 1233 (41°S, offshore Chile) was studied with a ∼200 year resolution spanning the last 25,000 years. The study provides the first continuous record of sub-recent and recent dinoflagellate cysts in the Southeast (SE) Pacific. Major...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.815994 2024-09-15T17:46:34+00:00 Late Quateranry dinoflagellate cysts of ODP Site 202-1233 Verleye, Thomas Louwye, Stephen LATITUDE: -41.000080 * LONGITUDE: -74.449860 * DATE/TIME START: 2002-04-12T00:00:00 * DATE/TIME END: 2002-04-12T00:00:00 2013 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.815994 https://doi.org/10.1594/PANGAEA.815994 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.815994 https://doi.org/10.1594/PANGAEA.815994 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Verleye, Thomas; Louwye, Stephen (2010): Late Quaternary environmental changes and latitudinal shifts of the Antarctic Circumpolar Current as recorded by dinoflagellate cysts from offshore Chile (41°S). Quaternary Science Reviews, 29(7-8), 1025-1039, https://doi.org/10.1016/j.quascirev.2010.01.009 202-1233A DRILL Drilling/drill rig Joides Resolution Leg202 Ocean Drilling Program ODP South Pacific Ocean dataset publication series 2013 ftpangaea https://doi.org/10.1594/PANGAEA.81599410.1016/j.quascirev.2010.01.009 2024-07-24T02:31:21Z The late Quaternary organic-walled dinoflagellate cyst record of Site 1233 (41°S, offshore Chile) was studied with a ∼200 year resolution spanning the last 25,000 years. The study provides the first continuous record of sub-recent and recent dinoflagellate cysts in the Southeast (SE) Pacific. Major changes in the composition of the cyst association, cyst concentration and morphology of Operculodinium centrocarpum reflect changes in sea surface temperature (SST), sea surface salinity (SSS), palaeoproductivity and upwelling intensity. These changes can be associated with latitudinal shifts of the circumpolar frontal systems. The high cyst concentration, high Brigantedinium spp. abundances, low species diversity and the occurrence of certain cold water species are supportive for a 7–10° equatorward shift of the Antarctic Circumpolar Current (ACC) during the coldest phase of the Last Glacial Maximum (LGM) between 25 and 21.1 cal ka BP. Deglacial warming initiated at ~18.6 cal ka BP. Termination I (18.6–11.1 cal ka BP) is interrupted by an unstable period of extreme seasonality, rather than a cooling event, between 14.4 and 13.2 cal ka BP, synchronous with the Antarctic Cold Reversal (ACR). The Holocene Maximum is observed between 11.6 and 9.8 cal ka BP and is typified by the most southward position of the northern margin of the ACC. A cooling phase occurred during the early Holocene (until ~7 cal ka BP) and during the last ~0.8 ka. Our data indicates that the SE Pacific (41°S) climate has been influenced over the whole record by changes in the Southern Hemisphere (SH) high-latitudes, while during the mid to late Holocene, also a tropical forcing mechanism was involved, including the El Niño Southern Oscillation and the variable Hadley cell intensity. Furthermore, this study showed a relationship between the variable morphology of the spines/processes of O. centrocarpum and the combined variation of sea surface salinity and temperature (SSS/SST-ratio). Other/Unknown Material Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-74.449860,-74.449860,-41.000080,-41.000080) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
202-1233A DRILL Drilling/drill rig Joides Resolution Leg202 Ocean Drilling Program ODP South Pacific Ocean |
spellingShingle |
202-1233A DRILL Drilling/drill rig Joides Resolution Leg202 Ocean Drilling Program ODP South Pacific Ocean Verleye, Thomas Louwye, Stephen Late Quateranry dinoflagellate cysts of ODP Site 202-1233 |
topic_facet |
202-1233A DRILL Drilling/drill rig Joides Resolution Leg202 Ocean Drilling Program ODP South Pacific Ocean |
description |
The late Quaternary organic-walled dinoflagellate cyst record of Site 1233 (41°S, offshore Chile) was studied with a ∼200 year resolution spanning the last 25,000 years. The study provides the first continuous record of sub-recent and recent dinoflagellate cysts in the Southeast (SE) Pacific. Major changes in the composition of the cyst association, cyst concentration and morphology of Operculodinium centrocarpum reflect changes in sea surface temperature (SST), sea surface salinity (SSS), palaeoproductivity and upwelling intensity. These changes can be associated with latitudinal shifts of the circumpolar frontal systems. The high cyst concentration, high Brigantedinium spp. abundances, low species diversity and the occurrence of certain cold water species are supportive for a 7–10° equatorward shift of the Antarctic Circumpolar Current (ACC) during the coldest phase of the Last Glacial Maximum (LGM) between 25 and 21.1 cal ka BP. Deglacial warming initiated at ~18.6 cal ka BP. Termination I (18.6–11.1 cal ka BP) is interrupted by an unstable period of extreme seasonality, rather than a cooling event, between 14.4 and 13.2 cal ka BP, synchronous with the Antarctic Cold Reversal (ACR). The Holocene Maximum is observed between 11.6 and 9.8 cal ka BP and is typified by the most southward position of the northern margin of the ACC. A cooling phase occurred during the early Holocene (until ~7 cal ka BP) and during the last ~0.8 ka. Our data indicates that the SE Pacific (41°S) climate has been influenced over the whole record by changes in the Southern Hemisphere (SH) high-latitudes, while during the mid to late Holocene, also a tropical forcing mechanism was involved, including the El Niño Southern Oscillation and the variable Hadley cell intensity. Furthermore, this study showed a relationship between the variable morphology of the spines/processes of O. centrocarpum and the combined variation of sea surface salinity and temperature (SSS/SST-ratio). |
format |
Other/Unknown Material |
author |
Verleye, Thomas Louwye, Stephen |
author_facet |
Verleye, Thomas Louwye, Stephen |
author_sort |
Verleye, Thomas |
title |
Late Quateranry dinoflagellate cysts of ODP Site 202-1233 |
title_short |
Late Quateranry dinoflagellate cysts of ODP Site 202-1233 |
title_full |
Late Quateranry dinoflagellate cysts of ODP Site 202-1233 |
title_fullStr |
Late Quateranry dinoflagellate cysts of ODP Site 202-1233 |
title_full_unstemmed |
Late Quateranry dinoflagellate cysts of ODP Site 202-1233 |
title_sort |
late quateranry dinoflagellate cysts of odp site 202-1233 |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.815994 https://doi.org/10.1594/PANGAEA.815994 |
op_coverage |
LATITUDE: -41.000080 * LONGITUDE: -74.449860 * DATE/TIME START: 2002-04-12T00:00:00 * DATE/TIME END: 2002-04-12T00:00:00 |
long_lat |
ENVELOPE(-74.449860,-74.449860,-41.000080,-41.000080) |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: Verleye, Thomas; Louwye, Stephen (2010): Late Quaternary environmental changes and latitudinal shifts of the Antarctic Circumpolar Current as recorded by dinoflagellate cysts from offshore Chile (41°S). Quaternary Science Reviews, 29(7-8), 1025-1039, https://doi.org/10.1016/j.quascirev.2010.01.009 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.815994 https://doi.org/10.1594/PANGAEA.815994 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.81599410.1016/j.quascirev.2010.01.009 |
_version_ |
1810494824316403712 |