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  • 1
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    PANGAEA
    In:  Supplement to: Rodrigo-Gámiz, Marta; Martinez-Ruiz, Francisca C; Rampen, Sebastiaan W; Schouten, Stefan; Sinninghe Damsté, Jaap S (2014): Sea surface temperature variations in the western Mediterranean Sea over the last 20 kyr: a dual-organic proxy (UK'37 and LDI) approach. Paleoceanography, 29(2), 87-98, https://doi.org/10.1002/2013PA002466
    Publication Date: 2023-01-13
    Description: A high-resolution sea surface temperature (SST) reconstruction of the western Mediterranean was accomplished using two independent, algae-based molecular organic proxies, i.e. the UK'37 index based on long-chain unsaturated ketones and the novel long-chain diol index (LDI) based on the relative abundances of C28 and C30 1,13- and 1,15-diols. Two marine records, from the western and eastern Alboran Sea basin, spanning the last 14 and 20 kyr, respectively, were studied. Results from the surface sediments suggest that the two proxies presently reflect seasons with similar SST, or simply annual mean SST. Both proxy records reveal the transition from the Last Glacial Maximum to the Holocene in the eastern Alboran Sea with an SST increase of ca. 7 °C for UK'37 and 9 °C for LDI. Minimum SSTs (10-12 °C) are reached at the end of the Last Glacial Maximum and during the last Heinrich event with a subsequent rapid SST increase in LDI-SST towards the beginning of the Bölling period (20 °C), while UK'37-SST remains constantly low (~12 °C). The Bölling-Alleröd is characterized by a rapid increase and subsequent decrease in UK'37-SST, while the LDI-SST decrease continuously. Short-term fluctuations in UK'37-SST are probably related to availability of nutrients and seasonal changes. The Younger Dryas is recorded as a short cold interval followed by progressively warmer temperatures. During the Holocene, the general lower UK'37-derived temperature values in the eastern Alboran (by ca. 1.5-2 °C) suggest a southeastward cold water migration by the western Alboran gyre and divergence in the haptophyte blooming season between both basins.
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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  • 2
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    PANGAEA
    In:  Supplement to: Rodrigo-Gámiz, Marta; Rampen, Sebastiaan W; de Haas, Henk; Baas, Marianne; Schouten, Stefan; Sinninghe Damsté, Jaap S (2015): Constraints on the applicability of the organic temperature proxies UK'37, TEX86 and LDI in the subpolar region around Iceland. Biogeosciences, 12(22), 6573-6590, https://doi.org/10.5194/bg-12-6573-2015
    Publication Date: 2023-01-13
    Description: Subpolar regions are key areas to study natural climate variability, due to their high sensitivity to rapid environmental changes, particularly through sea surface temperature (SST) variations. Here, we have tested three independent organic temperature proxies (UK'37, TEX86 and LDI) on their potential applicability for SST reconstruction in the subpolar region around Iceland. UK'37, TEX86 and TEXL86 temperature estimates from suspended particulate matter showed a substantial discrepancy with instrumental data, while long chain alkyl diols were below detection limit in most of the stations. In the northern Iceland Basin, sedimenting particles revealed a seasonality in lipid fluxes i.e. high fluxes of alkenones and GDGTs were measured during late spring-summer, and high fluxes of long chain alkyl diols during late summer. The flux-weighted average temperature estimates had a significant negative (ca. 2.3°C for UK'37) and positive (up to 5°C for TEX86) offset with satellite-derived SSTs and temperature estimates derived from the underlying surface sediment. UK'37 temperature estimates from surface sediments around Iceland correlate well with summer mean sea surface temperatures, while TEX86 derived temperatures correspond with both annual and winter mean 0-200 m temperatures, suggesting a subsurface temperature signal. Anomalous LDI-SST values in surface sediments, and low mass flux of 1,13- and 1,15-diols compared to 1,14-diols, suggest that Proboscia diatoms are the major sources of long chain alkyl diols in this area rather than eustigmatophyte algae, and therefore the LDI cannot be applied in this region.
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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  • 3
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    PANGAEA
    In:  Supplement to: Rampen, Sebastiaan W; Datema, Mariska; Rodrigo-Gámiz, Marta; Schouten, Stefan; Reichart, Gert-Jan; Sinninghe Damsté, Jaap S (2014): Sources and proxy potential of long chain alkyl diols in lacustrine environments. Geochimica et Cosmochimica Acta, 144, 59-71, https://doi.org/10.1016/j.gca.2014.08.033
    Publication Date: 2023-01-13
    Description: Long chain 1,13- and 1,15-alkyl diols form the base of a number of recently proposed proxies used for climate reconstruction. However, the sources of these lipids and environmental controls on their distribution are still poorly constrained. We have analyzed the long chain alkyl diol (LCD) composition of cultures of ten eustigmatophyte species, with three species from different families grown at various temperatures, to identify the effect of species composition and growth temperature on the LCD distribution. The results were compared with the LCD distribution of sixty-two lake surface sediments, and with previously reported LCD distributions from marine environments. The different families within the Eustigmatophyceae show distinct LCD patterns, with the freshwater family Eustigmataceae most closely resembling LCD distributions in both marine and lake environments. Unlike the other two eustigmatophyte families analyzed (Monodopsidaceae and Goniochloridaceae), C28 and C30 1,13-alkyl diols and C30 and C32 1,15-alkyl diols are all relatively abundant in the family Eustigmataceae, while the mono-unsaturated C32 1,15-alkyl diol was below detection limit. In contrast to the marine environment, LCD distributions in lakes did not show a clear relationship with temperature. The Long chain Diol Index (LDI), a proxy previously proposed for sea surface temperature reconstruction, showed a relatively weak correlation (R2 = 0.33) with mean annual air temperature used as an approximation for annual mean surface temperature of the lakes. A much-improved correlation (R2 = 0.74, p-value〈0.001) was observed applying a multiple linear regression analysis between LCD distributions and lake temperatures reconstructed using branched tetraether lipid distributions. The obtained regression model provides good estimates of temperatures for cultures of the family Eustigmataceae, suggesting that algae belonging to this family have an important role as a source for LCDs in lacustrine environments, or, alternatively, that the main sources of LCDs are similarly affected by temperature as the Eustigmataceae. The results suggest that LCDs may have the potential to be applicable as a palaeotemperature proxy for lacustrine environments, although further calibration work is still required.
    Type: Dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 32 kBytes
    Location Call Number Limitation Availability
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  • 4
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    PANGAEA
    In:  Supplement to: Rodrigo-Gámiz, Marta; Rampen, Sebastiaan W; Schouten, Stefan; Sinninghe Damsté, Jaap S (2016): The impact of oxic degradation on long chain alkyl diol distributions in Arabian Sea surface sediments. Organic Geochemistry, 100, 1-9, https://doi.org/10.1016/j.orggeochem.2016.07.003
    Publication Date: 2023-03-03
    Description: Oxygen exposure has a large impact on lipid biomarker preservation in surface sediments and may affect the application of organic proxies used for reconstructing past environmental conditions. To determine its effect on long chain alkyl diol and keto-ol based proxies, the distributions of these lipids was studied in nine surface sediments from the Murray Ridge in the Arabian Sea obtained from varying water depths (900 to 3000 m) but in close lateral proximity and, therefore, likely receiving a similar particle flux. Due to substantial differences in bottom water oxygen concentration (〈3 to 77 µmol/L) and sedimentation rate, substantial differences exist in the time the biomarker lipids are exposed to oxygen in the sediment. Long chain alkyl diol and keto-ol concentrations in the surface sediments (0-0.5 cm) decreased progressively with increasing oxygen exposure time, suggesting increased oxic degradation. The 1,15-keto-ol/diol ratio (DOXI) increased slightly with oxygen exposure time as diols had apparently slightly higher degradation rates than keto-ols. The ratio of 1,14- vs. 1,13- or 1,15-diols, used as upwelling proxies, did not show substantial changes. However, the C30 1,15-diol exhibited a slightly higher degradation rate than C28 and C30 1,13-diols, and thus the Long chain Diol Index (LDI), used as sea surface temperature proxy, showed a negative correlation with the maximum residence time in the oxic zone of the sediment, resulting in ca. 2-3.5 °C change, when translated to temperature. The UK'37 index did not show significant changes with increasing oxygen exposure. This suggests that oxic degradation may affect temperature reconstructions using the LDI in oxic settings and where oxygen concentrations have varied substantially over time.
    Keywords: 64PE301; Alkenone, C37:2; Alkenone, C37:3; Alkenone, unsaturation index UK'37; BC; Box corer; C30 1,15-keto-ol; C32 1,15-keto-ol; C34 1,15-keto-ol; Calculated after Rampen et al. (2012); Calculated from UK'37 (Müller et al, 1998); Carbon, organic, per unit sediment mass; Carbon, organic, total; DEPTH, sediment/rock; Diol oxidation index; Diol upwelling index; Elevation of event; Event label; Latitude of event; Long chain diol, C28:1 1,14-diol; Long chain diol, C28 1,13-diol; Long chain diol, C28 1,14-diol; Long chain diol, C30:1 1,14-diol; Long chain diol, C30 1,13-diol; Long chain diol, C30 1,14-diol; Long chain diol, C30 1,15-diol; Long chain diol, C32 1,15-diol; Long chain diol index; Longitude of event; Northern Arabian Sea; Oxygen penetration depth; PA1000; PA1200; PA1300; PA1500; PA1800; PA2000; PA2500; PA3000; PA900; PASOM; Pelagia; Residence time; Sea surface temperature, annual mean
    Type: Dataset
    Format: text/tab-separated-values, 358 data points
    Location Call Number Limitation Availability
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  • 5
    Publication Date: 2023-03-03
    Keywords: 64PE341; Acyclic glycerol dialkyl glycerol tetraether, flux; Alkenone, C37:2+C37:3, flux; C28+C30 1,14-diols, flux; Crenarchaeol, flux; DATE/TIME; DEPTH, water; Flux of total mass; LCD01-1; Long chain diol index, flux; Long-Chain Diols 2011; Pelagia; Sample code/label; South off Iceland; Tetraether index of 86 carbon atoms of glycerol dialkyl glycerol tetraethers, flux; Trap, sediment; TRAPS; Unsaturated C28:1+C30:1 1,14-diol, flux
    Type: Dataset
    Format: text/tab-separated-values, 188 data points
    Location Call Number Limitation Availability
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  • 6
    Publication Date: 2023-05-12
    Keywords: Chlorophyll a; DEPTH, water; interpolated; LATITUDE; LONGITUDE; Nitrate; Phosphate; Salinity, interpolated; Silicate; Station label; Temperature, water, interpolated
    Type: Dataset
    Format: text/tab-separated-values, 1463 data points
    Location Call Number Limitation Availability
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  • 7
    Publication Date: 2023-06-19
    Keywords: Area/locality; Chlorophyll a; DEPTH, water; interpolated; LATITUDE; LONGITUDE; Mixed layer depth; Nitrate; Phosphate; Salinity, interpolated; Silicate; Station label; Temperature, water, interpolated
    Type: Dataset
    Format: text/tab-separated-values, 27935 data points
    Location Call Number Limitation Availability
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  • 8
    Publication Date: 2023-06-27
    Keywords: 64PE341; 64PE357; Alkenone, unsaturation index UK'37; Calculated from LDI (Rampen et al., 2012); Calculated from TEX86 (Kim et al., 2010); Calculated from UK'37 (Müller et al, 1998); Date/Time of event; DEPTH, water; DIOLS-Trap Recovery; Event label; extracted from the World Ocean Atlas 2009 (WOA09); Latitude of event; LCD_A; LCD_B; LCD_C; LCD_D; LCD_E; LCD_F; LCD_G; LCD01-2; LCD07-2; LCD08-2; LCD10-2; LCD13-2; LCD16-2; Long chain diol index; Long-Chain Diols 2011; Longitude of event; Measured in situ; PCTD-RO; Pelagia; PUMP; PumpCTD/Rosette; Satellite derived; Sea surface temperature; Sea surface temperature, July; Sea surface temperature, summer; South off Iceland; Tetraether index of 86 carbon atoms; Tetraether index of 86 carbon atoms, low-temperature region; Water pump
    Type: Dataset
    Format: text/tab-separated-values, 118 data points
    Location Call Number Limitation Availability
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  • 9
    Publication Date: 2023-06-27
    Keywords: 293G; AGE; Alboran Sea; Alkenone, unsaturation index UK'37; Calculated from LDI (Rampen et al., 2012); Calculated from UK'37 (Müller et al, 1998); DEPTH, sediment/rock; GC; Gravity corer; Long chain diol index; Professor Logachev; Sample code/label; Sea surface temperature, annual mean; TTR-12_293G; TTR-12/3
    Type: Dataset
    Format: text/tab-separated-values, 485 data points
    Location Call Number Limitation Availability
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  • 10
    Publication Date: 2023-06-27
    Keywords: 434G; AGE; Alboran Sea; Alkenone, unsaturation index UK'37; Calculated from LDI (Rampen et al., 2012); Calculated from UK'37 (Müller et al, 1998); DEPTH, sediment/rock; GC; Gravity corer; Long chain diol index; Professor Logachev; Sample code/label; Sea surface temperature, annual mean; TTR-17_434G; TTR-17/1
    Type: Dataset
    Format: text/tab-separated-values, 456 data points
    Location Call Number Limitation Availability
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