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  • 1
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    Diatom assemblage of core M77/2_003-2 (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: Diatom assemblage of sediment core M77/2_003-2
    Keywords: Actinocyclus curvatulus; Actinocyclus exiguus; Actinocyclus octonarius; Actinocyclus spp.; Actinoptychus senarius; Actinoptychus spp.; Actinoptychus vulgaris; Alveus marinus; Amphiascus minutus; Amphora spp.; Asteromphalus arachne; Azpeitia africana; Azpeitia nodulifera; Azpeitia tabularis; Biddulphia alternans; Biddulphia spp.; Cerataulina pelagica; Chaetoceros; Chaetoceros cinctus; Chaetoceros diadema; Chaetoceros didymus; Chaetoceros lorenzianus; Chaetoceros spp.; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cocconeis californica; Cocconeis costata; Cocconeis dirupta; Cocconeis distans; Cocconeis placentula; Cocconeis scutellum; Cocconeis spp.; Coscinodiscus asteromphalus; Coscinodiscus centralis; Coscinodiscus concinnus; Coscinodiscus radiatus; Coscinodiscus spp.; Cyclotella spp.; Cyclotella striata; Cyclotella stylorum; Cymbella pusilla; Delphineis karstenii; DEPTH, sediment/rock; diatoms; Diatoms; Diploneis spp.; Discoaster spp.; Ditylum brightwellii; Eucampia spp.; Eunotia spp.; Eunotogramma debile; Fragilariopsis doliolus; Glyphodesmis distans; Grammatophora spp.; Hemiaulus spp.; Hemidiscus cuneiformis; M77/2; M77/2_003-2; M77/2_636-1; Meteor (1986); Minidiscus chilensis; Navicula spp.; Nitzschia bicapitata; Nitzschia gandersheimiensis; Nitzschia interruptestriata; Nitzschia ovalis; Nitzschia sicula; Odontella spp.; Paralia sulcata; PC; Peru; Phytoliths; Piston corer; Plagiogramma tessalatum; Plagiogrammopsis vanheurckii; Planktonellia sol; Pleurosigma spp.; Proboscia alata; Pseudogomphonema spp.; Pseudo-nitzschia pungens; Pseudosolenia calcar-avis; Radiolarians; Rhizosolenia acicularis; Rhizosolenia acuminata; Rhizosolenia bergonii; Rhizosolenia castracanei; Rhizosolenia clevei; Rhizosolenia decipiens; Rhizosolenia hyalina; Rhizosolenia imbricata; Rhizosolenia spp.; Roperia tessellata; SFB754; Silicoflagellates; Skeletonema costatum; Sponge spiculae; Stephanopyxis spp.; Thalassionema bacillaris; Thalassionema nitzschioides; Thalassionema nitzschioides var. capitulata; Thalassionema nitzschioides var. claviformis; Thalassionema nitzschioides var. inflata; Thalassionema nitzschioides var. lanceolata; Thalassionema nitzschioides var. nitzschioides; Thalassionema nitzschioides var. parva; Thalassiosira eccentrica; Thalassiosira leptopus; Thalassiosira oestrupii; Thalassiosira pacifica; Thalassiosira spp.; Thalassiothrix longissima; Trachyneis spp.
    Type: Dataset
    Format: text/tab-separated-values, 8295 data points
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  • 2
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    d30Si signatures and biogenic opal content (%) of sediment core M772_003-2 off Peru (piston corer) (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: The dataset comprises all d30Si signatures and biogenic opal content (%) of core M772_003-2 off Peru
    Keywords: AGE; biogenic opal; Climate - Biogeochemistry Interactions in the Tropical Ocean; DEPTH, sediment/rock; Diatoms, δ30Si; M77/2; M77/2_003-2; M77/2_636-1; Meteor (1986); Opal, biogenic silica; PC; Peru; Piston corer; Sample code/label; SFB754; Standard deviation; δ30Si, biogenic silica
    Type: Dataset
    Format: text/tab-separated-values, 486 data points
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  • 3
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    14C and age models for cores M772-052 and M772-029; diatom assemblages and biogenic opal and organic carbon data (2017)
    PANGAEA
    In:  Supplement to: Doering, Kristin; Erdem, Zeynep; Ehlert, Claudia; Fleury, Sophie; Frank, Martin; Schneider, Ralph R (2016): Changes in diatom productivity and upwelling intensity off Peru since the Last Glacial Maximum: Response to basin-scale atmospheric and oceanic forcing. Paleoceanography, 31(10), 1453-1473, https://doi.org/10.1002/2016PA002936
    Details
    Publication Date: 2023-10-28
    Description: New records of stable silicon isotope signatures (?30Si) together with concentrations of biogenic opal and organic carbon from the central (9°S) and northern (5°S) Peruvian margin reveal changes in diatom productivity and nutrient utilization during the past 20,000 years. The findings are based on a new approach using the difference between the ?30Si signatures of small (11-32 ?m) and large (〉150 ?m) diatom fractions (?30Si ) in combination with the variance in diatom assemblages for reconstruction Coscino-bSi of past upwelling intensity. Combination of our records with two previously published records from the southern upwelling area off Peru (12-15°S) shows a general decoupling of the environmental conditions at the central and southern shelf mainly caused by a northward shift of the main upwelling cell from its modern position (12-15°S) toward 9°S during Termination 1. At this time only moderate upwelling intensity and productivity levels prevailed between 9°S and 12°S interpreted by a more northerly position of Southern Westerly Winds and the South Pacific Subtropical High. Furthermore, a marked decrease in productivity at 12-15°S during Heinrich Stadial 1 coincided with enhanced biogenic opal production in the Eastern Equatorial Pacific, which was induced by a southward shift of the Intertropical Convergence Zone and enhanced northeasterly trade winds. Modern conditions were only established at the onset of the Holocene. Past changes in preformed ?30Si signatures of subsurface waters reaching the Peruvian Upwelling System did not significantly affect the preserved ?30Si signatures
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 4
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    d30Si signatures (%) of surface sediments off Peru (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-18
    Description: The dataset comprises all d30Si signatures (bSiO2 and Coscinodiscus) of surface sediments off Peru
    Keywords: biogenic opal; Climate - Biogeochemistry Interactions in the Tropical Ocean; DEPTH, water; Event label; LATITUDE; LONGITUDE; M77/1; M77/1_420-1; M77/1_450-1; M77/1_462-1; M77/1_469-1; M77/1_471-1; M77/1_482-1; M77/1_543-1; M77/1_615-1; M77/1_620-1; M77/1_623-1; M77/2; M77/2_002-5; M77/2_005-5; M77/2_022-2; M77/2_028-2; M77/2_029-5; M77/2_045-3; M77/2_050-1; M77/2_052-3; M77/2_053-1; M77/2_060-1; M77/2_062-2; M77/2_067-2; M77/2_076-2; M77/2_635-6; M77/2_649-1; M77/2_669; M77/2_685; M77/2_692; M77/2_717; M77/2_727; M77/2_734; M77/2_736; M77/2_756; M77/2_762; M77/2_776; M77/2_800; Meteor (1986); MUC; MultiCorer; Multicorer with television; Peru; SFB754; Standard deviation; TVMUC; δ30Si; δ30Si, biogenic silica
    Type: Dataset
    Format: text/tab-separated-values, 67 data points
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  • 5
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    Centennial-scale variations in diatom productivity off Peru over the last 3000 years (2015)
    Sage Publications
    Details
    Publication Date: 2015-11-30
    Print ISSN: 0959-6836
    Electronic ISSN: 1477-0911
    Topics: Geography , Geosciences
    Published by Sage Publications
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    PAPER CURRENT
  • 6
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    Differences between mono-generic and mixed diatom silicon isotope compositions trace present and past nutrient utilisation off Peru (2016)
    Elsevier
    Details
    Publication Date: 2016-03-01
    Print ISSN: 0016-7037
    Electronic ISSN: 1872-9533
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Elsevier
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  • 7
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    Changes in diatom productivity and upwelling intensity off Peru since the Last Glacial Maximum: Response to basin-scale atmospheric and oceanic forcing (2016)
    American Geophysical Union
    Details
    Publication Date: 2016-10-01
    Print ISSN: 2572-4517
    Electronic ISSN: 2572-4525
    Topics: Geosciences
    Published by American Geophysical Union
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  • 8
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    Differences between mono-generic and mixed diatom silicon isotope compositions trace present and past nutrient utilisation off Peru (2016)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 177 . pp. 30-47.
    Details
    Publication Date: 2019-02-01
    Description: In this study we combine for the first time silicon (Si) isotope compositions of small mixed diatom species (δ30SibSiO2) and of large handpicked mono-generic (i.e. genus = Coscinodiscus) diatom samples (δ30SiCoscino) with diatom assemblages extracted from marine sediments in the Peruvian upwelling region in order to constrain present and past silicate utilisation. The extension of a previous core-top data set from the Peruvian shelf demonstrates that δ30SiCoscino values record near-complete Si utilisation, as these are similar to the isotopic composition of the subsurface source waters feeding the upwelling. In contrast, the δ30SibSiO2 of small mixed diatom species increase southward along the shelf as well as towards the shore. We attribute highest δ30SibSiO2 values partly to transient iron limitation but primarily to the gradual increase of Si isotope fractionation within the seasonal diatom succession, which are mainly recorded by small diatom species during intense bloom events. In contrast, lower δ30SibSiO2 values are related to initial Si isotope utilisation during periods of weak upwelling, when low Si(OH)4 concentrations do not permit intense blooms and small diatom species record substantially lower δ30Si signatures. As such, we propose that the intensity of the upwelling can be deduced from the offset between δ30SibSiO2 and δ30SiCoscino (Δ30Sicoscino–bSiO2), which is low for strong upwelling conditions and high for prevailing weak upwelling. We apply the information extracted from surface sediments to generate a record of the present-day main upwelling region covering the past 17,700 years and find that this location has also been characterized by a persistent offset (Δ30Sicoscino–bSiO2). By comparison with the diatom assemblages we show that the coastal upwelling system changed markedly between weak and strong upwelling conditions. In addition, our model calculations to quantify species-specific Si isotope fractionation effects based on the diatom assemblages indicate an overall minor influence that cannot explain the high amplitude in the measured δ30SibSiO2 record.
    Type: Article , PeerReviewed
    Format: text
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  • 9
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    Changes in diatom productivity and upwelling intensity off Peru since the Last Glacial Maximum: Response to basin-scale atmospheric and oceanic forcing (2016)
    AGU (American Geophysical Union) | Wiley
    In:  Paleoceanography, 31 (10). 1453-1473 .
    Details
    Publication Date: 2019-02-01
    Description: New records of stable silicon isotope signatures (δ30Si) together with concentrations of biogenic opal and organic carbon from the central (9° S) and northern (5° S) Peruvian margin reveal changes in diatom productivity and nutrient utilization during the past 20,000 years. The findings are based on a new approach using the difference between the δ30Si signatures of small (11-32μm) and large (〉150μm) diatom fractions (Δ30Sicoscino-bSi) in combination with the variance in diatom assemblages for reconstruction of past upwelling intensity. Combination of our records with two previously published records from the southern upwelling area off Peru (12-15° S) shows a general decoupling of the environmental conditions at the central and southern shelf mainly caused by a northward shift of the main upwelling cell from its modern position (12-15° S) towards 9° S during Termination 1. At this time only moderate upwelling intensity and productivity levels prevailed between 9° S and 12° S interpreted by a more northerly position of Southern Westerly Winds and the South Pacific Subtropical High. Furthermore, a marked decrease in productivity at 12-15° S during Heinrich Stadial 1 coincided with enhanced biogenic opal production in the Eastern Equatorial Pacific, which was induced by a southward shift of the Intertropical Convergence zone and enhanced northeasterly trade winds. Modern conditions were only established at the onset of the Holocene. Past changes in preformed δ30Si signatures of subsurface waters reaching the Peruvian Upwelling System did not significantly affect the preserved δ30Si signatures.
    Type: Article , PeerReviewed
    Format: text
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