(Table 2) Distribution of alkenone unsaturation index UK37 of the eastern North Atlantic, supplement to: Conte, Maureen H; Eglinton, Geoffrey (1993): Alkenone and alkenoate distributions within the euphotic zone of the eastern North Atlantic: correlation with production temperature. Deep Sea Research Part I: Oceanographic Research Papers, 40(10), 1935-1961
This paper reports the concentrations and within-class distributions of long-chain alkenones and alkyl alkenoates in the surface waters (0–50 m) of the eastern North Atlantic, and correlates their abundance and distribution with those of source organisms and with water temperature and other environm...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA - Data Publisher for Earth & Environmental Science
1993
|
Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.67009 https://doi.pangaea.de/10.1594/PANGAEA.67009 |
id |
ftdatacite:10.1594/pangaea.67009 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Event label Latitude of event Longitude of event Date/Time of event DEPTH, water Temperature, water Heptatriaconta-8E,15E,22E-trien-2-one Methyl hexatriaconta-7E,14E,21E-trienoate Heptatriaconta-15E,22E-dien-2-one Methyl hexatriaconta-14E,21E-dienoate Octatriaconta-9E,16E,23E-trien-2-one Octatriaconta-16E,23E-dien-3-one Octatriaconta-16E,23E-dien-2-one Alkenone, unsaturation index UK37 Alkenoate index Water pump CD53 Charles Darwin Joint Global Ocean Flux Study JGOFS |
spellingShingle |
Event label Latitude of event Longitude of event Date/Time of event DEPTH, water Temperature, water Heptatriaconta-8E,15E,22E-trien-2-one Methyl hexatriaconta-7E,14E,21E-trienoate Heptatriaconta-15E,22E-dien-2-one Methyl hexatriaconta-14E,21E-dienoate Octatriaconta-9E,16E,23E-trien-2-one Octatriaconta-16E,23E-dien-3-one Octatriaconta-16E,23E-dien-2-one Alkenone, unsaturation index UK37 Alkenoate index Water pump CD53 Charles Darwin Joint Global Ocean Flux Study JGOFS Conte, Maureen H Eginton, G (Table 2) Distribution of alkenone unsaturation index UK37 of the eastern North Atlantic, supplement to: Conte, Maureen H; Eglinton, Geoffrey (1993): Alkenone and alkenoate distributions within the euphotic zone of the eastern North Atlantic: correlation with production temperature. Deep Sea Research Part I: Oceanographic Research Papers, 40(10), 1935-1961 |
topic_facet |
Event label Latitude of event Longitude of event Date/Time of event DEPTH, water Temperature, water Heptatriaconta-8E,15E,22E-trien-2-one Methyl hexatriaconta-7E,14E,21E-trienoate Heptatriaconta-15E,22E-dien-2-one Methyl hexatriaconta-14E,21E-dienoate Octatriaconta-9E,16E,23E-trien-2-one Octatriaconta-16E,23E-dien-3-one Octatriaconta-16E,23E-dien-2-one Alkenone, unsaturation index UK37 Alkenoate index Water pump CD53 Charles Darwin Joint Global Ocean Flux Study JGOFS |
description |
This paper reports the concentrations and within-class distributions of long-chain alkenones and alkyl alkenoates in the surface waters (0–50 m) of the eastern North Atlantic, and correlates their abundance and distribution with those of source organisms and with water temperature and other environmental variables. We collected these samples of >0.8 µm particulate material from the euphotic zone along the JGOFS 20°W longitude transect, from 61°N to 24°N, during seven cruises of the UK-JGOFS Biogeochemical Ocean Flux Study (BOFS) in 1989-1991; the biogeographical range of our 53 samples extends from the cold (<10°C), nutrient-rich and highly productive subarctic waters of the Iceland Basin to the warm (>25°C) oligotrophic subtropical waters off Africa. Surface water concentrations of total alkenone and alkenoates ranged from <50 ng/l in oligotrophic waters below 40°N to 2000-4500 ng/l in high latitude E. huxleyi blooms, and were well correlated with E. huxleyi cell densities, supporting the assumption that E. huxleyi is the predominant source of these compounds in the present day North Atlantic.The within-class distribution of the C37 and C38 alkenones and C36 alkenoates varied strongly as a function of temperature, and was largely unaffected by nutrient concentration, bloom status and other surface water properties. The biosynthetic response of the source organisms to growth temperature differed between the cold (<16°C) waters above 47°N and the warmer waters to the south. In cold (<16°C) waters above 47°N, the relative amounts of alkenoates and C38 alkenones synthesized was a strong function of growth temperature, while the unsaturation ratio of the alkenones (C37 and C38) was uncorrelated with temperature. Conversely, in warm (>16°C) waters below 47°N, the relative proportions of alkenoates and alkenones synthesized remained constant with increasing temperature while the unsaturation ratios of the C37 and C38 methyl alkenones (Uk37 and Uk38Me, respectively) increased linearly. The fitted regressions of Uk37 and Uk38Me versus temperature for waters >16°C were both highly significant (r**2 > 0.96) and had identical slopes (0.057) that were 50% higher than the slope (0.034) of the temperature calibration of Uk37 reported by Prahl and Wakeham (1987; doi:10.1038/330367a0) over the same temperature range. These observations suggest either a physiological adjustment in biochemical response to growth temperature above a 16-17°C threshold and/or variation between different E. huxleyi strains and/or related species inhabiting the cold and warm water regions of the eastern North Atlantic.Using our North Atlantic data set, we have produced multivariate temperature calibrations incorporating all major features of the alkenone and alkenoate data set. Predicted temperatures using multivariate calibrations are largely unbiased, with a standard error of approximately ±1°C over the entire data range. In contrast, simpler calibration models cannot adequately incorporate regional diversity and nonlinear trends with temperature. Our results indicate that calibrations based upon single variables, such as Uk37, can be strongly biased by unknown systematic errors arising from natural variability in the biosynthetic response of the source organisms to growth temperature. Multivariate temperature calibration can be expected to give more precise estimates of Integrated Production Temperatures (IPT) in the sedimentary record over a wider range of paleoenvironmental conditions, when derived using a calibration data set incorporating a similar range of natural variability in biosynthetic response. |
format |
Dataset |
author |
Conte, Maureen H Eginton, G |
author_facet |
Conte, Maureen H Eginton, G |
author_sort |
Conte, Maureen H |
title |
(Table 2) Distribution of alkenone unsaturation index UK37 of the eastern North Atlantic, supplement to: Conte, Maureen H; Eglinton, Geoffrey (1993): Alkenone and alkenoate distributions within the euphotic zone of the eastern North Atlantic: correlation with production temperature. Deep Sea Research Part I: Oceanographic Research Papers, 40(10), 1935-1961 |
title_short |
(Table 2) Distribution of alkenone unsaturation index UK37 of the eastern North Atlantic, supplement to: Conte, Maureen H; Eglinton, Geoffrey (1993): Alkenone and alkenoate distributions within the euphotic zone of the eastern North Atlantic: correlation with production temperature. Deep Sea Research Part I: Oceanographic Research Papers, 40(10), 1935-1961 |
title_full |
(Table 2) Distribution of alkenone unsaturation index UK37 of the eastern North Atlantic, supplement to: Conte, Maureen H; Eglinton, Geoffrey (1993): Alkenone and alkenoate distributions within the euphotic zone of the eastern North Atlantic: correlation with production temperature. Deep Sea Research Part I: Oceanographic Research Papers, 40(10), 1935-1961 |
title_fullStr |
(Table 2) Distribution of alkenone unsaturation index UK37 of the eastern North Atlantic, supplement to: Conte, Maureen H; Eglinton, Geoffrey (1993): Alkenone and alkenoate distributions within the euphotic zone of the eastern North Atlantic: correlation with production temperature. Deep Sea Research Part I: Oceanographic Research Papers, 40(10), 1935-1961 |
title_full_unstemmed |
(Table 2) Distribution of alkenone unsaturation index UK37 of the eastern North Atlantic, supplement to: Conte, Maureen H; Eglinton, Geoffrey (1993): Alkenone and alkenoate distributions within the euphotic zone of the eastern North Atlantic: correlation with production temperature. Deep Sea Research Part I: Oceanographic Research Papers, 40(10), 1935-1961 |
title_sort |
(table 2) distribution of alkenone unsaturation index uk37 of the eastern north atlantic, supplement to: conte, maureen h; eglinton, geoffrey (1993): alkenone and alkenoate distributions within the euphotic zone of the eastern north atlantic: correlation with production temperature. deep sea research part i: oceanographic research papers, 40(10), 1935-1961 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1993 |
url |
https://dx.doi.org/10.1594/pangaea.67009 https://doi.pangaea.de/10.1594/PANGAEA.67009 |
genre |
Iceland North Atlantic Subarctic |
genre_facet |
Iceland North Atlantic Subarctic |
op_relation |
https://dx.doi.org/10.1016/0967-0637(93)90040-a |
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.67009 https://doi.org/10.1016/0967-0637(93)90040-a |
_version_ |
1766043920200892416 |
spelling |
ftdatacite:10.1594/pangaea.67009 2023-05-15T16:53:23+02:00 (Table 2) Distribution of alkenone unsaturation index UK37 of the eastern North Atlantic, supplement to: Conte, Maureen H; Eglinton, Geoffrey (1993): Alkenone and alkenoate distributions within the euphotic zone of the eastern North Atlantic: correlation with production temperature. Deep Sea Research Part I: Oceanographic Research Papers, 40(10), 1935-1961 Conte, Maureen H Eginton, G 1993 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.67009 https://doi.pangaea.de/10.1594/PANGAEA.67009 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/0967-0637(93)90040-a Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Event label Latitude of event Longitude of event Date/Time of event DEPTH, water Temperature, water Heptatriaconta-8E,15E,22E-trien-2-one Methyl hexatriaconta-7E,14E,21E-trienoate Heptatriaconta-15E,22E-dien-2-one Methyl hexatriaconta-14E,21E-dienoate Octatriaconta-9E,16E,23E-trien-2-one Octatriaconta-16E,23E-dien-3-one Octatriaconta-16E,23E-dien-2-one Alkenone, unsaturation index UK37 Alkenoate index Water pump CD53 Charles Darwin Joint Global Ocean Flux Study JGOFS Supplementary Dataset dataset Dataset 1993 ftdatacite https://doi.org/10.1594/pangaea.67009 https://doi.org/10.1016/0967-0637(93)90040-a 2021-11-05T12:55:41Z This paper reports the concentrations and within-class distributions of long-chain alkenones and alkyl alkenoates in the surface waters (0–50 m) of the eastern North Atlantic, and correlates their abundance and distribution with those of source organisms and with water temperature and other environmental variables. We collected these samples of >0.8 µm particulate material from the euphotic zone along the JGOFS 20°W longitude transect, from 61°N to 24°N, during seven cruises of the UK-JGOFS Biogeochemical Ocean Flux Study (BOFS) in 1989-1991; the biogeographical range of our 53 samples extends from the cold (<10°C), nutrient-rich and highly productive subarctic waters of the Iceland Basin to the warm (>25°C) oligotrophic subtropical waters off Africa. Surface water concentrations of total alkenone and alkenoates ranged from <50 ng/l in oligotrophic waters below 40°N to 2000-4500 ng/l in high latitude E. huxleyi blooms, and were well correlated with E. huxleyi cell densities, supporting the assumption that E. huxleyi is the predominant source of these compounds in the present day North Atlantic.The within-class distribution of the C37 and C38 alkenones and C36 alkenoates varied strongly as a function of temperature, and was largely unaffected by nutrient concentration, bloom status and other surface water properties. The biosynthetic response of the source organisms to growth temperature differed between the cold (<16°C) waters above 47°N and the warmer waters to the south. In cold (<16°C) waters above 47°N, the relative amounts of alkenoates and C38 alkenones synthesized was a strong function of growth temperature, while the unsaturation ratio of the alkenones (C37 and C38) was uncorrelated with temperature. Conversely, in warm (>16°C) waters below 47°N, the relative proportions of alkenoates and alkenones synthesized remained constant with increasing temperature while the unsaturation ratios of the C37 and C38 methyl alkenones (Uk37 and Uk38Me, respectively) increased linearly. The fitted regressions of Uk37 and Uk38Me versus temperature for waters >16°C were both highly significant (r**2 > 0.96) and had identical slopes (0.057) that were 50% higher than the slope (0.034) of the temperature calibration of Uk37 reported by Prahl and Wakeham (1987; doi:10.1038/330367a0) over the same temperature range. These observations suggest either a physiological adjustment in biochemical response to growth temperature above a 16-17°C threshold and/or variation between different E. huxleyi strains and/or related species inhabiting the cold and warm water regions of the eastern North Atlantic.Using our North Atlantic data set, we have produced multivariate temperature calibrations incorporating all major features of the alkenone and alkenoate data set. Predicted temperatures using multivariate calibrations are largely unbiased, with a standard error of approximately ±1°C over the entire data range. In contrast, simpler calibration models cannot adequately incorporate regional diversity and nonlinear trends with temperature. Our results indicate that calibrations based upon single variables, such as Uk37, can be strongly biased by unknown systematic errors arising from natural variability in the biosynthetic response of the source organisms to growth temperature. Multivariate temperature calibration can be expected to give more precise estimates of Integrated Production Temperatures (IPT) in the sedimentary record over a wider range of paleoenvironmental conditions, when derived using a calibration data set incorporating a similar range of natural variability in biosynthetic response. Dataset Iceland North Atlantic Subarctic DataCite Metadata Store (German National Library of Science and Technology) |