Alkenone unsaturation index and alkenones in ODP Hole 161-977A, supplement to: Martrat, Belén (2007): Studies of sedimentary organic matter to infer rapid climatic changes at the Barents and Iberian continental margins on centennial time resolution over the past four climate cycles of the Quaternary (ca. 420,000 years). Ph. D. Thesis, UPC, CSIC, Barcelona, Spain
A number of essential elements closely related to each other are involved in the Earth's climatic system. The temporal and spatial distribution of insolation determines wind patterns and the ocean's thermohaline pump. In turn, these last two are directly linked to the extension and retreat...
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Format: | Dataset |
Language: | English |
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PANGAEA - Data Publisher for Earth & Environmental Science
2007
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Online Access: | https://dx.doi.org/10.1594/pangaea.819829 https://doi.pangaea.de/10.1594/PANGAEA.819829 |
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ftdatacite:10.1594/pangaea.819829 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Sample code/label AGE Alkenone, unsaturation index UK'37 Alkenone, C372Me+C373Me Sea surface temperature, annual mean Drilling/drill rig DSDP/ODP/IODP sample designation Calculated from UK'37 Müller et al, 1998 Leg161 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
Sample code/label AGE Alkenone, unsaturation index UK'37 Alkenone, C372Me+C373Me Sea surface temperature, annual mean Drilling/drill rig DSDP/ODP/IODP sample designation Calculated from UK'37 Müller et al, 1998 Leg161 Joides Resolution Ocean Drilling Program ODP Martrat, Belén Alkenone unsaturation index and alkenones in ODP Hole 161-977A, supplement to: Martrat, Belén (2007): Studies of sedimentary organic matter to infer rapid climatic changes at the Barents and Iberian continental margins on centennial time resolution over the past four climate cycles of the Quaternary (ca. 420,000 years). Ph. D. Thesis, UPC, CSIC, Barcelona, Spain |
topic_facet |
Sample code/label AGE Alkenone, unsaturation index UK'37 Alkenone, C372Me+C373Me Sea surface temperature, annual mean Drilling/drill rig DSDP/ODP/IODP sample designation Calculated from UK'37 Müller et al, 1998 Leg161 Joides Resolution Ocean Drilling Program ODP |
description |
A number of essential elements closely related to each other are involved in the Earth's climatic system. The temporal and spatial distribution of insolation determines wind patterns and the ocean's thermohaline pump. In turn, these last two are directly linked to the extension and retreat of marine and continental ice and to the chemistry of the atmosphere and the ocean. The variability of these elements may trigger, amplify, sustain or globalize rapid climatic changes. Paleoclimatic oscillations have been identified in this thesis by using fossil organic compounds synthesized by marine and terrestrial flora. High sedimentation rate deposits at the Barents and the Iberian peninsula continental margins were chosen in order to estimate the climatic changes on centennial time resolution. At the Barents margin, the sediment recovered was up to 15,000 years old (unit ''a'', from latin ''annos'') (M23258; west of the Bjørnøya island). At the Iberian margin, the sediment cores studied covered a wide range of time spans: up to 115,000 a (MD99-2343; north of the Minorca island), up to 250,000 a (ODP-977A; Alboran basin) and up to 420,000 a (MD01-2442, MD01-2443, MD01-2444, MD01-2445; close to the Tagus abyssal plain). At the northern site, inputs containing marine, continental and ancient reworked organic matter provided a detailed reconstruction of climate history at the time of the final retreat of the Barents ice sheet. At the western Barents continental slope, warm climatic conditions were observed during the early Holocene (~from 8,650 a to 5,240 a ago); in contrast, an apparent long-term cooling trend occurred in the late Holocene (~from 5,240 a to 760 a ago), in consistence with other paleoarchives from northern and southern European latitudes. The Iberian margin sites, which were never covered with large ice sheets, preserved exceptionally complete sequences of rapid events during ice ages hitherto not studied in such great detail: during the last glacial (~from 70,900 a to 11,800 a ago), the second glacial (~from 189,300 a to 127,500 a ago), the third ice age (~from 278,600 a to 244,800 a ago) and the fourth (~from 376,300 a to 337,500 a ago). In this thesis, crucial research questions were brought up concerning the severity of different glacial periods, the intensity and rates of the recorded oscillations and the long distance connections related to rapid climate change. The data obtained provide a sound basis to further research on the mechanisms involved in this rapid climate variability. An essential point of the research was the evidence that, over the past 420,000 a, at the whole Iberian margin, warm and stable long periods similar to the Holocene always ended abruptly in few centuries after a gradual deterioration of climate conditions. The detailed estimate of past climate variability provides clues to the natural end of the present warm period. Returning to an ice age in European lands would be exacerbated by a number of factors: a lack of differential solar heating between northern and southern north Atlantic latitudes, enhanced evaporation at low latitudes, and an increase in snowfall or iceberg discharges at northern regions. It must be emphasized that all climatic oscillations observed in this thesis were caused by forces of nature, i.e. the last two centuries were not taken into consideration. : Research co-funded by The European Social Fund (ESF)AGE [ka BP] is cal ka BP. |
format |
Dataset |
author |
Martrat, Belén |
author_facet |
Martrat, Belén |
author_sort |
Martrat, Belén |
title |
Alkenone unsaturation index and alkenones in ODP Hole 161-977A, supplement to: Martrat, Belén (2007): Studies of sedimentary organic matter to infer rapid climatic changes at the Barents and Iberian continental margins on centennial time resolution over the past four climate cycles of the Quaternary (ca. 420,000 years). Ph. D. Thesis, UPC, CSIC, Barcelona, Spain |
title_short |
Alkenone unsaturation index and alkenones in ODP Hole 161-977A, supplement to: Martrat, Belén (2007): Studies of sedimentary organic matter to infer rapid climatic changes at the Barents and Iberian continental margins on centennial time resolution over the past four climate cycles of the Quaternary (ca. 420,000 years). Ph. D. Thesis, UPC, CSIC, Barcelona, Spain |
title_full |
Alkenone unsaturation index and alkenones in ODP Hole 161-977A, supplement to: Martrat, Belén (2007): Studies of sedimentary organic matter to infer rapid climatic changes at the Barents and Iberian continental margins on centennial time resolution over the past four climate cycles of the Quaternary (ca. 420,000 years). Ph. D. Thesis, UPC, CSIC, Barcelona, Spain |
title_fullStr |
Alkenone unsaturation index and alkenones in ODP Hole 161-977A, supplement to: Martrat, Belén (2007): Studies of sedimentary organic matter to infer rapid climatic changes at the Barents and Iberian continental margins on centennial time resolution over the past four climate cycles of the Quaternary (ca. 420,000 years). Ph. D. Thesis, UPC, CSIC, Barcelona, Spain |
title_full_unstemmed |
Alkenone unsaturation index and alkenones in ODP Hole 161-977A, supplement to: Martrat, Belén (2007): Studies of sedimentary organic matter to infer rapid climatic changes at the Barents and Iberian continental margins on centennial time resolution over the past four climate cycles of the Quaternary (ca. 420,000 years). Ph. D. Thesis, UPC, CSIC, Barcelona, Spain |
title_sort |
alkenone unsaturation index and alkenones in odp hole 161-977a, supplement to: martrat, belén (2007): studies of sedimentary organic matter to infer rapid climatic changes at the barents and iberian continental margins on centennial time resolution over the past four climate cycles of the quaternary (ca. 420,000 years). ph. d. thesis, upc, csic, barcelona, spain |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2007 |
url |
https://dx.doi.org/10.1594/pangaea.819829 https://doi.pangaea.de/10.1594/PANGAEA.819829 |
long_lat |
ENVELOPE(-67.250,-67.250,-68.151,-68.151) |
geographic |
Bjørnøya |
geographic_facet |
Bjørnøya |
genre |
Bjørnøya Ice Sheet North Atlantic |
genre_facet |
Bjørnøya Ice Sheet North Atlantic |
op_relation |
https://dx.doi.org/10.1594/pangaea.819805 https://dx.doi.org/10.1126/science.1101706 https://dx.doi.org/10.1594/pangaea.787811 https://dx.doi.org/10.1126/science.1139994 https://dx.doi.org/10.1594/pangaea.771894 https://dx.doi.org/10.1594/pangaea.780467 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.819829 https://doi.org/10.1594/pangaea.819805 https://doi.org/10.1126/science.1101706 https://doi.org/10.1594/pangaea.787811 https://doi.org/10.1126/science.1139994 https://doi.org/10.1594/pangaea.771894 https:/ |
_version_ |
1766379206833340416 |
spelling |
ftdatacite:10.1594/pangaea.819829 2023-05-15T15:44:50+02:00 Alkenone unsaturation index and alkenones in ODP Hole 161-977A, supplement to: Martrat, Belén (2007): Studies of sedimentary organic matter to infer rapid climatic changes at the Barents and Iberian continental margins on centennial time resolution over the past four climate cycles of the Quaternary (ca. 420,000 years). Ph. D. Thesis, UPC, CSIC, Barcelona, Spain Martrat, Belén 2007 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.819829 https://doi.pangaea.de/10.1594/PANGAEA.819829 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1594/pangaea.819805 https://dx.doi.org/10.1126/science.1101706 https://dx.doi.org/10.1594/pangaea.787811 https://dx.doi.org/10.1126/science.1139994 https://dx.doi.org/10.1594/pangaea.771894 https://dx.doi.org/10.1594/pangaea.780467 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Sample code/label AGE Alkenone, unsaturation index UK'37 Alkenone, C372Me+C373Me Sea surface temperature, annual mean Drilling/drill rig DSDP/ODP/IODP sample designation Calculated from UK'37 Müller et al, 1998 Leg161 Joides Resolution Ocean Drilling Program ODP Supplementary Dataset dataset Dataset 2007 ftdatacite https://doi.org/10.1594/pangaea.819829 https://doi.org/10.1594/pangaea.819805 https://doi.org/10.1126/science.1101706 https://doi.org/10.1594/pangaea.787811 https://doi.org/10.1126/science.1139994 https://doi.org/10.1594/pangaea.771894 https:/ 2022-02-08T16:24:46Z A number of essential elements closely related to each other are involved in the Earth's climatic system. The temporal and spatial distribution of insolation determines wind patterns and the ocean's thermohaline pump. In turn, these last two are directly linked to the extension and retreat of marine and continental ice and to the chemistry of the atmosphere and the ocean. The variability of these elements may trigger, amplify, sustain or globalize rapid climatic changes. Paleoclimatic oscillations have been identified in this thesis by using fossil organic compounds synthesized by marine and terrestrial flora. High sedimentation rate deposits at the Barents and the Iberian peninsula continental margins were chosen in order to estimate the climatic changes on centennial time resolution. At the Barents margin, the sediment recovered was up to 15,000 years old (unit ''a'', from latin ''annos'') (M23258; west of the Bjørnøya island). At the Iberian margin, the sediment cores studied covered a wide range of time spans: up to 115,000 a (MD99-2343; north of the Minorca island), up to 250,000 a (ODP-977A; Alboran basin) and up to 420,000 a (MD01-2442, MD01-2443, MD01-2444, MD01-2445; close to the Tagus abyssal plain). At the northern site, inputs containing marine, continental and ancient reworked organic matter provided a detailed reconstruction of climate history at the time of the final retreat of the Barents ice sheet. At the western Barents continental slope, warm climatic conditions were observed during the early Holocene (~from 8,650 a to 5,240 a ago); in contrast, an apparent long-term cooling trend occurred in the late Holocene (~from 5,240 a to 760 a ago), in consistence with other paleoarchives from northern and southern European latitudes. The Iberian margin sites, which were never covered with large ice sheets, preserved exceptionally complete sequences of rapid events during ice ages hitherto not studied in such great detail: during the last glacial (~from 70,900 a to 11,800 a ago), the second glacial (~from 189,300 a to 127,500 a ago), the third ice age (~from 278,600 a to 244,800 a ago) and the fourth (~from 376,300 a to 337,500 a ago). In this thesis, crucial research questions were brought up concerning the severity of different glacial periods, the intensity and rates of the recorded oscillations and the long distance connections related to rapid climate change. The data obtained provide a sound basis to further research on the mechanisms involved in this rapid climate variability. An essential point of the research was the evidence that, over the past 420,000 a, at the whole Iberian margin, warm and stable long periods similar to the Holocene always ended abruptly in few centuries after a gradual deterioration of climate conditions. The detailed estimate of past climate variability provides clues to the natural end of the present warm period. Returning to an ice age in European lands would be exacerbated by a number of factors: a lack of differential solar heating between northern and southern north Atlantic latitudes, enhanced evaporation at low latitudes, and an increase in snowfall or iceberg discharges at northern regions. It must be emphasized that all climatic oscillations observed in this thesis were caused by forces of nature, i.e. the last two centuries were not taken into consideration. : Research co-funded by The European Social Fund (ESF)AGE [ka BP] is cal ka BP. Dataset Bjørnøya Ice Sheet North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Bjørnøya ENVELOPE(-67.250,-67.250,-68.151,-68.151) |