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  • 1
    Book
    Book
    Short-term sediment resuspension on the continental slope and geochemical implications: the Faeroe-Shetland Channel : = Kortedurige sediment resuspensie op de continentale helling en de geochemische gevolgen hiervan: de Faeroe-Shetland Geul (2004)
    Utrecht : Univ.
    Details Availability
    Keywords: Dissertation ; Hochschulschrift ; Färöer ; Shetlandinseln ; Kontinentalabhang ; Meeressediment ; Abtragung
    Type of Medium: Book
    Pages: 152 S , graph. Darst., Kt
    ISBN: 9057440970
    Series Statement: Geologica Ultraiectina 238
    Language: English
    Note: Zsfassung in niederländ. Sprache , Zugl.: Utrecht, Univ., Diss., 2004
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  • 2
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    Branched GDGTs in the Tagus River drainage basin and its outflow into the Atlantic Ocean
    PANGAEA
    In:  Supplement to: Warden, Lisa; Kim, Jung-Hyun; Zell, Claudia; Vis, Geert-Jan; de Stigter, Henko; Bonnin, Jerome; Sinninghe Damsté, Jaap S (2016): Examining the provenance of branched GDGTs in the Tagus River drainage basin and its outflow into the Atlantic Ocean over the Holocene to determine their usefulness for paleoclimate applications. Biogeosciences, 13(20), 5719-5738, https://doi.org/10.5194/bg-13-5719-2016
    Details
    Publication Date: 2023-05-12
    Description: The distributions of branched glycerol dialkyl glycerol tetraethers (brGDGTs), which are transported from the soils where they are predominantly produced to marine sediments via rivers, have been applied in reconstructing mean annual air temperature (MAT) and pH of soils. However, paleoclimate reconstructions using sedimentary brGDGTs have proven difficult in arid regions, including the Iberian Peninsula. Recently, six novel 6-methyl brGDGTs have been described using new analytical methods (in addition to the nine 5-methyl brGDGTs previously used for climate reconstructions), and so new pH and MAT calibrations have been developed that were shown to improve the accuracy of reconstructions in a set of global soil samples, especially in arid regions. Because of this we decided to apply the new method to separate the 5- and 6-methyl isomers along with the novel calibrations to a sample set from the Iberian Peninsula to determine whether it improves paleoclimate reconstructions in this area. This set includes samples that run in a transect from source to sink along the Tagus River and out to the deep ocean off the Portuguese margin spanning the last 6000 years. We found that although pH reconstructions in the soils were improved using the new calibration, MAT reconstructions were not much better even with the separation of the 5- and 6-methyl brGDGTs. This confirmed the conclusion of previous studies that the amount of aquatically produced brGDGTs is overwhelming the soil-derived ones in marine sediments and complicating MAT reconstructions in the region. Additionally, the newseparation revealed a strong and until now unseen relationship between the new degree of cyclization (DC') of the brGDGTs and MAT that could be making temperature reconstructions in this and other arid regions difficult
    Keywords: NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 3
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    TEXL86-based oceanic temperatures in sediment core MD03-2601 (2012)
    PANGAEA
    In:  Supplement to: Kim, Jung-Hyun; Crosta, Xavier; Willmott, Verónica; Renssen, Hans; Bonnin, Jerome; Helmke, Peer; Schouten, Stefan; Sinninghe Damsté, Jaap S (2012): Holocene subsurface temperature variability in the eastern Antarctic continental margin. Geophysical Research Letters, 39, L06705, https://doi.org/10.1029/2012GL051157
    Details
    Publication Date: 2023-06-27
    Description: We reconstructed subsurface (~45-200 m water depth) temperature variability in the eastern Antarctic continental margin during the late Holocene, using an archaeal lipid-based temperature proxy (TEX86L). Our results reveal that subsurface temperature changes were probably positively coupled to the variability of warmer, nutrient-rich Modified Circumpolar Deep Water (MCDW, deep water of the Antarctic circumpolar current) intrusion onto the continental shelf. The TEX86L record, in combination with previously published climatic records, indicates that this coupling was probably related to the thermohaline circulation, seasonal variability in sea ice extent, sea temperature, and wind associated with high frequency climate dynamics at low-latitudes such as internal El Niño Southern Oscillation (ENSO). This in turn suggests a linkage between centennial ENSO-like variability at low-latitudes and intrusion variability of MCDW into the eastern Antarctic continental shelf, which might have further impact on ice sheet evolution.
    Keywords: AGE; Calculated from TEX86 (Kim et al., 2010); CALYPSO; Calypso Corer; DEPTH, sediment/rock; IMAGES X - CADO; Marion Dufresne (1995); MD032601; MD03-2601; MD130; Southern Ocean; Sub-surface temperature
    Type: Dataset
    Format: text/tab-separated-values, 46 data points
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    DATA PANGAEA
  • 4
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    (Table 3) Concentrations of GDGTs and brGDGT-based indices for each sample set along the Tagus transect
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 64PE269; 64PE269-39_4; 64PE332; 64PE332-30_2; 64PE332-44_2; AGE; Branched and isoprenoid tetraether index; Branched glycerol dialkyl glycerol tetraether, per unit mass total organic carbon; Carbon, organic, total; Crenarchaeol, per unit mass total organic carbon; Degree of cyclisation; DEPTH, sediment/rock; DEPTH, soil; DEPTH, water; Event label; GC; Gravity corer; Isomer ratio; Latitude of event; Longitude of event; Methylation index of dominant branched tetraethers; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; Pacemaker; PC; Pelagia; Piston corer; Portuguese Margin; Sample code/label; Sediment sample; SES; SOIL; Soil profile; TAGUS_501-029; Tagus_RB_1; Tagus_RB_11; Tagus_RB_14; Tagus_RB_17; Tagus_RB_2; Tagus_RB_22; Tagus_RB_6; Tagus_RB_8; Tagus_Soil_10; Tagus_Soil_12; Tagus_Soil_13; Tagus_Soil_14; Tagus_Soil_15; Tagus_Soil_16; Tagus_Soil_19; Tagus_Soil_20; Tagus_Soil_3; Tagus_Soil_4; Tagus_Soil_5; Tagus_Soil_7; Tagus_Soil_8; Tagus_Soil_9; Tagus Estuary, Portuguese margin; Tagus pro-delta, Portuguese margin; TR_10#1_Sup; TR_11#1_Sup; TR_12#1_Sup; TR_2_Sup; TR_3#1_Sup; TR_4#1_Sup; TR_5#1_Sup; TR_6#1_Sup; TR_7#1_Sup; TR_8#1_Sup; TR_9#1_Sup; Water sample; WS; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 1183 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    (Table S1) Concentrations of brGDGTs for each sample set along the Tagus transect
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 64PE269; 64PE269-39_4; 64PE332; 64PE332-30_2; 64PE332-44_2; Branched glycerol dialkyl glycerol tetraether, Ia; Branched glycerol dialkyl glycerol tetraether, Ib; Branched glycerol dialkyl glycerol tetraether, Ic; Branched glycerol dialkyl glycerol tetraether, IIa; Branched glycerol dialkyl glycerol tetraether, IIa'; Branched glycerol dialkyl glycerol tetraether, IIb; Branched glycerol dialkyl glycerol tetraether, IIb'; Branched glycerol dialkyl glycerol tetraether, IIc; Branched glycerol dialkyl glycerol tetraether, IIc'; Branched glycerol dialkyl glycerol tetraether, IIIa; Branched glycerol dialkyl glycerol tetraether, IIIa'; Branched glycerol dialkyl glycerol tetraether, IIIb; Branched glycerol dialkyl glycerol tetraether, IIIb'; Branched glycerol dialkyl glycerol tetraether, IIIc; Branched glycerol dialkyl glycerol tetraether, IIIc'; DEPTH, sediment/rock; DEPTH, soil; DEPTH, water; Event label; GC; Gravity corer; Latitude of event; Longitude of event; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; Pacemaker; PC; Pelagia; Piston corer; Portuguese Margin; Sample code/label; Sediment sample; SES; SOIL; Soil profile; TAGUS_501-029; Tagus_RB_1; Tagus_RB_11; Tagus_RB_14; Tagus_RB_17; Tagus_RB_2; Tagus_RB_22; Tagus_RB_6; Tagus_RB_8; Tagus_Soil_10; Tagus_Soil_12; Tagus_Soil_13; Tagus_Soil_14; Tagus_Soil_15; Tagus_Soil_16; Tagus_Soil_19; Tagus_Soil_20; Tagus_Soil_3; Tagus_Soil_4; Tagus_Soil_5; Tagus_Soil_7; Tagus_Soil_8; Tagus_Soil_9; Tagus Estuary, Portuguese margin; Tagus pro-delta, Portuguese margin; TR_10#1_Sup; TR_11#1_Sup; TR_12#1_Sup; TR_2_Sup; TR_3#1_Sup; TR_4#1_Sup; TR_5#1_Sup; TR_6#1_Sup; TR_7#1_Sup; TR_8#1_Sup; TR_9#1_Sup; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 1744 data points
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    DATA PANGAEA
  • 6
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    (Table 2) Age model of Tagus river samples (2016)
    PANGAEA
    Details
    Publication Date: 2023-12-14
    Keywords: 64PE269; 64PE269-39_4; 64PE332; 64PE332-30_2; 64PE332-44_2; Age, dated; Age, dated material; Age, dated standard error; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; GC; Gravity corer; Laboratory code/label; Latitude of event; Longitude of event; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; Pacemaker; PC; Pelagia; Piston corer; Portuguese Margin; Reference/source; TAGUS_501-029; Tagus Estuary, Portuguese margin
    Type: Dataset
    Format: text/tab-separated-values, 155 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Updated calibration of the clumped isotope thermometer in planktonic and benthic foraminifera (2018)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 239 . pp. 1-16.
    Details
    Publication Date: 2021-02-08
    Description: Accurate reconstruction of past ocean temperatures is of critical importance to paleoclimatology. Carbonate clumped isotope thermometry ("L'l47") is a relatively recent technique based on the strong relationship between calcification temperature and the statistical excess of 13C- 180 bonds in carbonates. Its application to foraminifera holds great scientific potential, particularly because Ll47 paleotemperature reconstructions do not require assumptions regarding the 180 composition of seawater. However there are still relatively few published observations investigating the potential influence of parameters such as salinity or foraminiferal size and species. We present a new calibration data set based on 234 replicate analyses of9 planktonic and 2 benthic species of foraminifera collected from recent core-top sediments, with calcification temperatures ranging from -2 to 25 °C. We observe a strong relationship between Ll47 values and independent, oxygen-IS estimates of calcification temperatures: L'l47 = 41.63 x 103 /T2 + 0.2056 The formal precision of this regression(± 0.7-1.0 °C at 95 % confidence level) is much smaller than typical analytical errors. Our observations confirm the absence of significant species-specific biases or salinity effects. We also investigate potential foraminifer size effects between 200 and 〉560 μm in 6 species, and conclude that all size fractions from a given core-top location and species display statistically undistinguishable L'l47 values. These findings provide a robust foundation for future interlaboratories comparisons and paleoceanographic applications.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.gca.2018.07.016
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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