Stable isotopes, CaCO3, opal and terrigeneous of ODP Site 108-663 (Table A1)
High- and low-latitude forcing of terrestrial African paleoclimate variability is demonstrated using 900 ka eolian and biogenic component records from Ocean Drilling Program site 663 in the eastern equatorial Atlantic. Terrigenous (eolian dust) and phytolith (savannah grass cuticle) accumulation rat...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.208129 2024-09-15T18:22:18+00:00 Stable isotopes, CaCO3, opal and terrigeneous of ODP Site 108-663 (Table A1) deMenocal, Peter B LATITUDE: -1.197800 * LONGITUDE: -11.878500 * DATE/TIME START: 1986-03-26T00:00:00 * DATE/TIME END: 1986-03-28T00:00:00 * MINIMUM ELEVATION: -3706.0 m * MAXIMUM ELEVATION: -3706.0 m 1993 text/tab-separated-values, 3372 data points https://doi.pangaea.de/10.1594/PANGAEA.208129 https://doi.org/10.1594/PANGAEA.208129 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.208129 https://doi.org/10.1594/PANGAEA.208129 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: deMenocal, Peter B; Ruddiman, William F; Pokras, Edward M (1993): Influences of high- and low-latitude processes on African terrestrial climate: Pleistocene eolian records from equatorial Atlantic Ocean Drilling Program Site 663. Paleoceanography, 8(2), 209-242, https://doi.org/10.1029/93PA02688 108-663 AGE Calcium carbonate COMPCORE Composite Core Density dry bulk Depth composite DSDP/ODP/IODP sample designation Globigerinoides ruber white δ18O Intercore correlation Joides Resolution Leg108 Melosira Ocean Drilling Program ODP Opal biogenic silica Phytoliths Sample code/label Sedimentation rate South Atlantic Ocean Terrigenous dataset 1993 ftpangaea https://doi.org/10.1594/PANGAEA.20812910.1029/93PA02688 2024-07-24T02:31:23Z High- and low-latitude forcing of terrestrial African paleoclimate variability is demonstrated using 900 ka eolian and biogenic component records from Ocean Drilling Program site 663 in the eastern equatorial Atlantic. Terrigenous (eolian dust) and phytolith (savannah grass cuticle) accumulation rate records vary predominantly at 100 and 41 kyr periodicities and spectral phase estimates implicate high-latitude forcing. The abundance of freshwater diatoms (Melosira) transported from dry African lake beds varies coherently at 23-19 kyr orbital periodicities and at a phasing which implicates low-latitude precessional monsoon forcing. Modeling studies demonstrate that African climate is sensitive to both high- and low-latitude boundary conditions. African monsoon intensity is modulated by direct insolation variations due to orbital precession, whereas remote high-latitude forcing can be related to cool North Atlantic sea surface temperatures (SSTs) which promote African aridity and enhance dust-transporting wind speeds. The site 663 terrigenous and phytolith records covary with North Atlantic SST variability at 41 °N (site 607). We suggest that Pleistocene African climate has responded to both high-latitude North Atlantic SST variability as well as low-latitude precessional monsoon forcing; the high-latitude influence dominates the sedimentary record. Prior to circa 2.4 Ma, terrigenous variations occurred primarily at precessional periodicities (23-19 kyr), indicating that African climate was largely controlled by low-latitude insolation variations prior to the onset of high-amplitude glacial-interglacial climate change. Dataset North Atlantic South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-11.878500,-11.878500,-1.197800,-1.197800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
108-663 AGE Calcium carbonate COMPCORE Composite Core Density dry bulk Depth composite DSDP/ODP/IODP sample designation Globigerinoides ruber white δ18O Intercore correlation Joides Resolution Leg108 Melosira Ocean Drilling Program ODP Opal biogenic silica Phytoliths Sample code/label Sedimentation rate South Atlantic Ocean Terrigenous |
spellingShingle |
108-663 AGE Calcium carbonate COMPCORE Composite Core Density dry bulk Depth composite DSDP/ODP/IODP sample designation Globigerinoides ruber white δ18O Intercore correlation Joides Resolution Leg108 Melosira Ocean Drilling Program ODP Opal biogenic silica Phytoliths Sample code/label Sedimentation rate South Atlantic Ocean Terrigenous deMenocal, Peter B Stable isotopes, CaCO3, opal and terrigeneous of ODP Site 108-663 (Table A1) |
topic_facet |
108-663 AGE Calcium carbonate COMPCORE Composite Core Density dry bulk Depth composite DSDP/ODP/IODP sample designation Globigerinoides ruber white δ18O Intercore correlation Joides Resolution Leg108 Melosira Ocean Drilling Program ODP Opal biogenic silica Phytoliths Sample code/label Sedimentation rate South Atlantic Ocean Terrigenous |
description |
High- and low-latitude forcing of terrestrial African paleoclimate variability is demonstrated using 900 ka eolian and biogenic component records from Ocean Drilling Program site 663 in the eastern equatorial Atlantic. Terrigenous (eolian dust) and phytolith (savannah grass cuticle) accumulation rate records vary predominantly at 100 and 41 kyr periodicities and spectral phase estimates implicate high-latitude forcing. The abundance of freshwater diatoms (Melosira) transported from dry African lake beds varies coherently at 23-19 kyr orbital periodicities and at a phasing which implicates low-latitude precessional monsoon forcing. Modeling studies demonstrate that African climate is sensitive to both high- and low-latitude boundary conditions. African monsoon intensity is modulated by direct insolation variations due to orbital precession, whereas remote high-latitude forcing can be related to cool North Atlantic sea surface temperatures (SSTs) which promote African aridity and enhance dust-transporting wind speeds. The site 663 terrigenous and phytolith records covary with North Atlantic SST variability at 41 °N (site 607). We suggest that Pleistocene African climate has responded to both high-latitude North Atlantic SST variability as well as low-latitude precessional monsoon forcing; the high-latitude influence dominates the sedimentary record. Prior to circa 2.4 Ma, terrigenous variations occurred primarily at precessional periodicities (23-19 kyr), indicating that African climate was largely controlled by low-latitude insolation variations prior to the onset of high-amplitude glacial-interglacial climate change. |
format |
Dataset |
author |
deMenocal, Peter B |
author_facet |
deMenocal, Peter B |
author_sort |
deMenocal, Peter B |
title |
Stable isotopes, CaCO3, opal and terrigeneous of ODP Site 108-663 (Table A1) |
title_short |
Stable isotopes, CaCO3, opal and terrigeneous of ODP Site 108-663 (Table A1) |
title_full |
Stable isotopes, CaCO3, opal and terrigeneous of ODP Site 108-663 (Table A1) |
title_fullStr |
Stable isotopes, CaCO3, opal and terrigeneous of ODP Site 108-663 (Table A1) |
title_full_unstemmed |
Stable isotopes, CaCO3, opal and terrigeneous of ODP Site 108-663 (Table A1) |
title_sort |
stable isotopes, caco3, opal and terrigeneous of odp site 108-663 (table a1) |
publisher |
PANGAEA |
publishDate |
1993 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.208129 https://doi.org/10.1594/PANGAEA.208129 |
op_coverage |
LATITUDE: -1.197800 * LONGITUDE: -11.878500 * DATE/TIME START: 1986-03-26T00:00:00 * DATE/TIME END: 1986-03-28T00:00:00 * MINIMUM ELEVATION: -3706.0 m * MAXIMUM ELEVATION: -3706.0 m |
long_lat |
ENVELOPE(-11.878500,-11.878500,-1.197800,-1.197800) |
genre |
North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic South Atlantic Ocean |
op_source |
Supplement to: deMenocal, Peter B; Ruddiman, William F; Pokras, Edward M (1993): Influences of high- and low-latitude processes on African terrestrial climate: Pleistocene eolian records from equatorial Atlantic Ocean Drilling Program Site 663. Paleoceanography, 8(2), 209-242, https://doi.org/10.1029/93PA02688 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.208129 https://doi.org/10.1594/PANGAEA.208129 |
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.20812910.1029/93PA02688 |
_version_ |
1810461947774107648 |