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  • 1
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    Satellite derived and ice model data off Western Antarctic Peninsula (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: Antarctic sea ice; AWI_Envi; File content; File format; File name; File size; highly branched isoprenoids; IPSO25; Paleoclimate; Polar Terrestrial Environmental Systems @ AWI; sea ice proxy; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Geochemistry of sediment core PS97/072-1TC (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-25
    Keywords: Age; AGE; Antarctic sea ice; ANT-XXXI/3; AWI_Envi; AWI_Paleo; Bransfield Strait; Carbon, organic, total; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Diatoms, sea-ice; highly branched isoprenoids; IPSO25; Modern analog technique (MAT), D274/28/4an; Paleoclimate; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Polar Terrestrial Environmental Systems @ AWI; PS97; PS97/072-1TC; sea ice proxy; Sea surface temperature, summer; TC; Transfer function, IKM – D336/29/3q; Trigger corer
    Type: Dataset
    Format: text/tab-separated-values, 238 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Sea Ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study (2020)
    PANGAEA
    Details
    Publication Date: 2023-07-06
    Description: In the last decades, changing climate conditions have had a severe impact on sea ice at the Western Antarctic Peninsula (WAP), an area rapidly transforming under global warming. To study the development of spring sea ice and environmental conditions in the pre-satellite era we investigated three short marine sediment cores for their biomarker inventory with particular focus on the sea ice proxy IPSO25 and micropaleontological proxies. The core sites are located in the Bransfield Strait, in shelf to deep basin areas characterized by a complex oceanographic frontal system, coastal influence and sensitivity to large-scale atmospheric circulation patterns. We analyzed geochemical bulk parameters, biomarkers (highly branched isoprenoids, glycerol dialkyl glycerol tetraethers, sterols), as well as diatom abundances and diversity over the past 240 years, and compared them to observational data, sedimentary and ice core climate archives as well as results from numerical models. Based on biomarker results we identified four different environmental units characterized by (A) low sea ice cover and high ocean temperatures, (B) moderate sea ice cover with decreasing ocean temperatures, (C) high but variable sea ice cover during intervals of lower ocean temperatures and (D) extended sea ice cover coincident with a rapid ocean warming. While IPSO25 concentrations correspond quite well with satellite sea ice observations for the past 40 years, we note discrepancies between the biomarker-based sea ice estimates and the long-term model output for the past 240 years, ice core records and reconstructed atmospheric circulation patterns such as the El Niño Southern Oscillation (ENSO) and Southern Annular Mode (SAM). We propose that the sea ice biomarker proxies IPSO25 and PIPSO25 are not linearly related to sea ice cover and, additionally, each core site reflects specific, local environmental conditions. High IPSO25 and PIPSO25 values may not be directly interpreted as referring to high spring sea ice cover because variable sea ice conditions and enhanced nutrient supply may affect the production of both the sea-ice associated and phytoplankton-derived (open marine, pelagic) biomarker lipids. For future interpretations we recommend to carefully consider individual biomarker records to distinguish between cold, sea ice favoring and warm, sea ice diminishing environmental conditions.
    Keywords: Antarctic sea ice; AWI_Envi; AWI_Paleo; highly branched isoprenoids; IPSO25; Paleoclimate; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polar Terrestrial Environmental Systems @ AWI; sea ice proxy
    Type: Dataset
    Format: application/zip, 6 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Diatoms in near-surface sediments of the Western Antarctic Peninsula (2020)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: Achnanthes sp.; Actinocyclus actinochilus; Actinocyclus curvatulus; Alveus marinus; Amphora sp.; Antarctic sea ice; ANT-XXXI/3; Asteromphalus hookeri; Asteromphalus hyalinus; Asteromphalus parvulus; Asteromphalus sp.; AWI_Envi; AWI_Paleo; Azpeitia tabularis var. tabularis; Azpeitia tabularis var egregius; Bransfield Strait; Chaetoceros spp.; Chaetoceros spp. resting spores; Cocconeis costata var. costata; Cocconeis spp.; Corethron criophilum; Corethron pennatum; Coscinodiscus radiatus; Coscinodiscus spp.; Counting, diatoms; Dactyliosolen sp.; DEPTH, sediment/rock; Diatoms; Diatoms indeterminata; Diploneis sp.; Elevation of event; Entropyla sp.; Eucampia antarctica var. antarctica; Eucampia antarctica var. recta; Event label; Fragilariopsis curta; Fragilariopsis cylindrus; Fragilariopsis doliolus; Fragilariopsis kerguelensis; Fragilariopsis linearis; Fragilariopsis obliquecostata; Fragilariopsis rhombica; Fragilariopsis ritscheri; Fragilariopsis separanda; Fragilariopsis sp.; Fragilariopsis spp.; Fragilariopsis sublinearis; Fragilariopsis vanheurckii; Grammatophora angulosa; Hemidiscus cuneiformis; highly branched isoprenoids; IPSO25; Latitude of event; Longitude of event; Lycmophora sp.; MUC; MultiCorer; Navicula directa; Navicula glaciei; Navicula palpebralis; Navicula sp.; Navicula spp.; Nitzschia bicapitata; Nitzschia kolaczeckii; Nitzschia sicula var. rostrata; Nitzschia sp.; Odontella litigiosa; Odontella weissflogii; Paleoclimate; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Polar Terrestrial Environmental Systems @ AWI; Porosira pseudodenticulata; Porosira sp.; Proboscia sp.; Proboscia spp.; PS97; PS97/056-1; PS97/068-2; PS97/072-1TC; Pseudogomphonema kamtschaticum; Pseudo-nitzschia turgiduloides; Rhizosolenia antennata; Rhizosolenia antennata forma antennata; Rhizosolenia antennata forma semispina; Rhizosolenia bergonii; Rhizosolenia hebetata; Rhizosolenia sp.; Rhizosolenia spp.; Rhizosolenia styliformis; sea ice proxy; Stellarima microtrias; Stephanopyxis turris; Synedra sp.; Synedropsis recta; TC; Thalassionema nitzschioides var. lanceolata; Thalassiosira antarctica T1; Thalassiosira antarctica T2; Thalassiosira gracilis var. expecta; Thalassiosira gracilis var. gracilis; Thalassiosira gravida; Thalassiosira lentiginosa; Thalassiosira oliverana; Thalassiosira spp.; Thalassiosira trifulta; Thalassiosira tumida; Thalassiothrix antarctica/longissima group; Trachyneis apera; Trichotoxon reinboldii; Trigger corer; Trigonium arcticum
    Type: Dataset
    Format: text/tab-separated-values, 8170 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Geochemistry and biomarker of sediment core PS97/068-2 (2023)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Keywords: (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, per unit mass total organic carbon; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Age; AGE; Age, error; Antarctic sea ice; ANT-XXXI/3; AWI_Envi; AWI_Paleo; Branched and isoprenoid tetraether index; Bransfield Strait; Carbon, organic, total; Carbon/Nitrogen ratio; cholesta-5,24-dien-3beta-ol, per unit mass total organic carbon; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Diatoms, sea-ice; Gas chromatography - Mass spectrometry (GC-MS); highly branched isoprenoids; IPSO25; Lead-210 excess; Lead-210 excess, error; Modern analog technique (MAT), D274/28/4an; MUC; MultiCorer; Paleoclimate; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Phytoplankton biomarker Brassicasterol IPSO25 index; Phytoplankton biomarker Dinosterol IPSO25 index; Phytoplankton biomarker HBI E-Triene IPSO25 index; Phytoplankton biomarker HBI Z-Triene IPSO25 index; PIPSO25 calculated after Vorrath et al., 2019; Polarstern; Polar Terrestrial Environmental Systems @ AWI; PS97; PS97/068-2; sea ice proxy; Sea surface temperature, summer; Sedimentation rate per year; SOTOH, SOT based on RI-OH caculated after Lü et al., 2015 (Eq. 13 and 14); SOTTEX, SOT based on TEXL86 calculated after Kim et al., 2010 (Eq. 7 and 8); Sub-surface ocean temperature; Transfer function, IKM – D336/29/3q
    Type: Dataset
    Format: text/tab-separated-values, 1055 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Geochemistry and biomarker of sediment core PS97/056-1 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Keywords: (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, per unit mass total organic carbon; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Age; AGE; Age, error; Antarctic sea ice; ANT-XXXI/3; AWI_Envi; AWI_Paleo; Branched and isoprenoid tetraether index; Bransfield Strait; Carbon, organic, total; Carbon/Nitrogen ratio; cholesta-5,24-dien-3beta-ol, per unit mass total organic carbon; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Diatoms, sea-ice; Gas chromatography - Mass spectrometry (GC-MS); highly branched isoprenoids; IPSO25; Lead-210 excess; Lead-210 excess, error; Modern analog technique (MAT), D274/28/4an; MUC; MultiCorer; Paleoclimate; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Phytoplankton biomarker Brassicasterol IPSO25 index; Phytoplankton biomarker Dinosterol IPSO25 index; Phytoplankton biomarker HBI E-Triene IPSO25 index; Phytoplankton biomarker HBI Z-Triene IPSO25 index; PIPSO25 calculated after Vorrath et al., 2019; Polarstern; Polar Terrestrial Environmental Systems @ AWI; PS97; PS97/056-1; sea ice proxy; Sea surface temperature, summer; Sedimentation rate per year; SOTOH, SOT based on RI-OH caculated after Lü et al., 2015 (Eq. 13 and 14); SOTTEX, SOT based on TEXL86 calculated after Kim et al., 2010 (Eq. 7 and 8); Sub-surface ocean temperature; Transfer function, IKM – D336/29/3q
    Type: Dataset
    Format: text/tab-separated-values, 709 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Geochemistry and biomarker of sediment core PS97/072-2 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Keywords: (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, per unit mass total organic carbon; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Age; AGE; Age, error; Antarctic sea ice; ANT-XXXI/3; AWI_Envi; AWI_Paleo; Branched and isoprenoid tetraether index; Bransfield Strait; Carbon, organic, total; Carbon/Nitrogen ratio; cholesta-5,24-dien-3beta-ol, per unit mass total organic carbon; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Gas chromatography - Mass spectrometry (GC-MS); highly branched isoprenoids; IPSO25; Lead-210 excess; Lead-210 excess, error; MUC; MultiCorer; Paleoclimate; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Phytoplankton biomarker Brassicasterol IPSO25 index; Phytoplankton biomarker Dinosterol IPSO25 index; Phytoplankton biomarker HBI E-Triene IPSO25 index; Phytoplankton biomarker HBI Z-Triene IPSO25 index; PIPSO25 calculated after Vorrath et al., 2019; Polarstern; Polar Terrestrial Environmental Systems @ AWI; PS97; PS97/072-2; sea ice proxy; Sedimentation rate per year; SOTOH, SOT based on RI-OH caculated after Lü et al., 2015 (Eq. 13 and 14); SOTTEX, SOT based on TEXL86 calculated after Kim et al., 2010 (Eq. 7 and 8); Sub-surface ocean temperature
    Type: Dataset
    Format: text/tab-separated-values, 827 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Unknown
    Sea ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study (2020)
    Copernicus
    In:  EPIC3Climate of the Past, Copernicus, 16(6), pp. 2459-2483, ISSN: 1814-9332
    Details
    Publication Date: 2021-06-16
    Description: In the last decades, changing climate conditions have had a severe impact on sea ice at the western Antarctic Peninsula (WAP), an area rapidly transforming under global warming. To study the development of spring sea ice and environmental conditions in the pre-satellite era we investigated three short marine sediment cores for their biomarker inventory with a particular focus on the sea ice proxy IPSO25 and micropaleontological proxies. The core sites are located in the Bransfield Strait in shelf to deep basin areas characterized by a complex oceanographic frontal system, coastal influence and sensitivity to large-scale atmospheric circulation patterns. We analyzed geochemical bulk parameters, biomarkers (highly branched isoprenoids, glycerol dialkyl glycerol tetraethers, sterols), and diatom abundances and diversity over the past 240 years and compared them to observational data, sedimentary and ice core climate archives, and results from numerical models. Based on biomarker results we identified four different environmental units characterized by (A) low sea ice cover and high ocean temperatures, (B) moderate sea ice cover with decreasing ocean temperatures, (C) high but variable sea ice cover during intervals of lower ocean temperatures, and (D) extended sea ice cover coincident with a rapid ocean warming. While IPSO25 concentrations correspond quite well to satellite sea ice observations for the past 40 years, we note discrepancies between the biomarker-based sea ice estimates, the long-term model output for the past 240 years, ice core records, and reconstructed atmospheric circulation patterns such as the El Niño–Southern Oscillation (ENSO) and Southern Annular Mode (SAM). We propose that the sea ice biomarker proxies IPSO25 and PIPSO25 are not linearly related to sea ice cover, and, additionally, each core site reflects specific local environmental conditions. High IPSO25 and PIPSO25 values may not be directly interpreted as referring to high spring sea ice cover because variable sea ice conditions and enhanced nutrient supply may affect the production of both the sea-ice-associated and phytoplankton-derived (open marine, pelagic) biomarker lipids. For future interpretations we recommend carefully considering individual biomarker records to distinguish between cold sea-ice-favoring and warm sea-ice-diminishing environmental conditions.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 9
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    Mass die-off of the cold-water coral Desmophyllum dianthus in the Chilean Patagonian fjord region (2014)
    Rosenstiel School of Marine and Atmospheric Science
    In:  EPIC3Bulletin of Marine Science, Rosenstiel School of Marine and Atmospheric Science, 90(3), pp. 895-899, ISSN: 0007-4977
    Details
    Publication Date: 2017-01-31
    Description: In fjords and channels of the Chilean Patagonia, the solitary cold-water coral Desmophyllum dianthus (Esper, 1794) can be found in depths as shallow as 7 m as part of a deep-water emerging benthic community. In the Comau Fjord, one of three Chilean fjords where this species is forming large banks with multiple branched pseudo colonies on the steep rock walls, shallow water coral communities have been monitored for more than a decade. In 2012, a mass die-off was observed along 8.4 km of coast line and at least down to 70 m depth. Only specimens of D. dianthus were affected while other organisms, including two more scleractinian species, were not visibly damaged. The event coincides with exceptionally high efflux of methane and sulfide enriched water from cold vents in the rock walls at this site. Due to strongly increased salmon farming activity in the last decade, algae blooms have increased in frequency and intensity as a result of elevated primary production. We hypothesize and provide evidence that either harmful substances from the cold vents or hypoxia following an exceptionally strong algae bloom—or the synergistic effects of both—might have caused the mass mortality.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 10
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    Fluctuations in export productivity over the last century from sediments of a southern Chilean fjord (44°S) (2006)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Authors, 2005. This is the author's version of the work. It is posted here by permission of Elsevier B. V. for personal use, not for redistribution. The definitive version was published in Estuarine, Coastal and Shelf Science 65 (2005): 587-600, doi:10.1016/j.ecss.2005.07.005.
    Description: Here we present the first reconstruction of changes in surface primary production during the last century from the Puyuhuapi fjord in southern Chile, using a variety of parameters (diatoms, biogenic silica, total organic carbon, chlorins, and proteins) as productivity proxies. Two sediment cores from the head and the center of the fjord were analyzed and compared to gain insights on past changes in productivity in these two different depositional environments. Higher sedimentation rates found at the head of the fjord result from the combination of a shallower water column and a restricted circulation by the occurrence of a sill. Additionally, sediment mixing depths estimated from 210Pb data suggest that suboxic conditions may dominate the bottom water and the sediment-water interface in this location. Productivity of the Puyuhuapi fjord during the last century was characterized by a constant increase from the late 19th century to the early 1980s, then decreased until the late-1990s, and then rose again to present-day values. The influence of rainfall on productivity was most noticeable during periods of low rainfall, which coincided with decreased overall productivity within the Puyuhuapi fjord. Simultaneous variations in productivity and rainfall in the study area suggest that marine productivity could respond to atmospheric-oceanic interactions at a local scale. At a regional scale, marine productivity of the area may be related to other large-scale processes such as the El Niño Southern Oscillation.
    Description: We are grateful to the Ministerio de Hacienda de Chile (Chilean Ministry of Treasury) and the National Oceanographic Committee (CONA) for financial support to carry out the Cimar-7 Fiordo Program (Grant C7F 01-10 to Silvio Pantoja), the FONDAP-COPAS Center, and Grant 200.031.085-1 (UdeC) for financial support. Sepúlveda was funded by a scholarship from the Graduate School of the University of Concepción and by the FONDAP-COPAS Center. Additional support was given by Fundación Andes through the Woods Hole Oceanographic Institution/University of Concepción agreement.
    Keywords: Paleoproductivity ; Organic matter ; Fjords ; Chile
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: 603977 bytes
    Format: application/pdf
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