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  • 1
    Publication Date: 2023-11-25
    Description: The uncertain response of marine terminating outlet glaciers to climate change at time scales beyond short-term observation limits models of future sea level rise. At temperate tidewater margins, abundant subglacial meltwater forms morainal banks (marine shoals) or ice-contact deltas that reduce water depth, stabilizing grounding lines and slowing or reversing glacial retreat. Here we present a radiocarbon-dated record from Integrated Ocean Drilling Program (IODP) Site U1421 that tracks the terminus of the largest Alaskan Cordilleran Ice Sheet outlet glacier during Last Glacial Maximum climate transitions. Sedimentation rates, ice-rafted debris, and microfossil and biogeochemical proxies, show repeated abrupt collapses and slow advances typical of the tidewater glacier cycle observed in modern systems. When global sea level rise exceeded the local rate of bank building, the cycle of readvances stopped leading to irreversible retreat. These results support theory that suggests sediment dynamics can control tidewater terminus position on an open shelf under temperate conditions delaying climate-driven retreat.
    Keywords: Cordilleran Ice Sheet; deglacial; Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; LGM
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 2
    Publication Date: 2023-11-25
    Keywords: 341-U1421A; 341-U1421C; Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated material; Age, dated standard error; Calendar age; Calendar age, error to older; Calendar age, error to younger; Calendar age, maximum/old; Calendar age, minimum/young; Carbon-14, modern; Carbon-14, modern, error; Comment; Cordilleran Ice Sheet; deglacial; Depth, bottom/max; Depth, composite; Depth, composite bottom; Depth, composite top; Depth, error; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp341; Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Joides Resolution; Laboratory code/label; Length; LGM; Sample code/label; Sample code/label 2; Sample ID; Southern Alaska Margin: Tectonics, Climate and Sedimentation; δ13C; δ13C, standard error
    Type: Dataset
    Format: text/tab-separated-values, 538 data points
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  • 3
    Publication Date: 2023-11-25
    Keywords: 341-U1421; Age model; COMPCORE; Composite Core; Cordilleran Ice Sheet; deglacial; DEPTH, sediment/rock; Exp341; Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Joides Resolution; LGM; Southern Alaska Margin: Tectonics, Climate and Sedimentation
    Type: Dataset
    Format: text/tab-separated-values, 210007 data points
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  • 4
    Publication Date: 2023-11-25
    Keywords: 341-U1421; AGE; COMPCORE; Composite Core; Cordilleran Ice Sheet; deglacial; Exp341; Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; LGM; Sedimentation rate; Southern Alaska Margin: Tectonics, Climate and Sedimentation
    Type: Dataset
    Format: text/tab-separated-values, 672 data points
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  • 5
    Publication Date: 2023-11-25
    Keywords: -; 341-U1421A; 341-U1421C; AGE; Cordilleran Ice Sheet; deglacial; Depth, bottom/max; Depth, composite; Depth, composite bottom; Depth, composite top; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Epistominella pacifica, δ13C; Epistominella pacifica, δ18O; Event label; Exp341; Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Joides Resolution; Laboratory code/label; LGM; Mass spectrometer Finnigan MAT 252; Neogloboquadrina pachyderma, δ13C; Neogloboquadrina pachyderma, δ18O; Sample code/label; Sample code/label 2; Southern Alaska Margin: Tectonics, Climate and Sedimentation; Uvigerina peregrina, δ13C; Uvigerina peregrina, δ18O
    Type: Dataset
    Format: text/tab-separated-values, 527 data points
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  • 6
    Publication Date: 2023-11-25
    Keywords: 341-U1421A; 341-U1421C; AGE; Age, error; Depth, bottom/max; Depth, composite; Depth, composite bottom; Depth, composite top; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp341; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Joides Resolution; Sample code/label; Sample code/label 2; Sea ice rafted quartz grains; Southern Alaska Margin: Tectonics, Climate and Sedimentation
    Type: Dataset
    Format: text/tab-separated-values, 378 data points
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  • 7
    Publication Date: 2023-11-25
    Keywords: 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 341-U1421A; 341-U1421C; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; AGE; Calcium carbonate; Carbon, organic, total; Carbon, organic/Nitrogen, total ratio; cholesta-5,24-dien-3beta-ol, per unit mass total organic carbon; cholesta-5,24-dien-3beta-ol per unit sediment mass; Cordilleran Ice Sheet; deglacial; Depth, bottom/max; Depth, composite; Depth, composite bottom; Depth, composite top; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp341; Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Joides Resolution; LGM; Sample code/label; Sample code/label 2; Southern Alaska Margin: Tectonics, Climate and Sedimentation
    Type: Dataset
    Format: text/tab-separated-values, 1000 data points
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  • 8
    Publication Date: 2023-11-25
    Keywords: -; 341-U1421A; 341-U1421C; Accumulation rate, diatoms; Actinocyclus curvatulus; Actinocyclus ochotensis; Actinoptychus spp.; AGE; Area; Asteromphalus spp.; Azpeitia neocrenulata; Azpeitia tabularis; Bacterosira constricta, resting spores; Bathyomphalus contortus; Chaetoceros morphogenera: Dispinodiscus; Chaetoceros morphogenera: Gemellodiscus; Chaetoceros morphogenera: hyaline variety; Chaetoceros morphogenera: Liradiscus; Chaetoceros morphogenera: Peripteropsis; Chaetoceros morphogenera: Syndendrium; Chaetoceros morphogenera: Vallodiscus; Chaetoceros morphogenera: Xanthodiscus; Chaetoceros spp.; Cocconeis costata; Cocconeis spp.; Cordilleran Ice Sheet; Coscinodiscus marginatus; Coscinodiscus oculus-iridis; Coscinodiscus radiatus; deglacial; Density, dry bulk; Depth, bottom/max; Depth, composite; Depth, composite bottom; Depth, composite top; Depth, top/min; Detonula confervacea; Diatoms; Diatoms, centrales; Diatoms, centrales indeterminata; Diatoms, naviculoid pennales; Diatoms, pennales; Diatoms, pennales indeterminata; Diatoms, sea-ice; Diploneis spp.; DRILL; Drilling/drill rig; Ehrenbergina spp.; Event label; Exp341; Fossula arctica; Fragilariopsis atlantica; Fragilariopsis cylindrus; Fragilariopsis doliolus; Fragilariopsis nana; Fragilariopsis oceanica; Fragilariopsis pseudonana; Fragilariopsis reginae-jahniae; Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Length; LGM; Lindavia spp.; Lioloma pacificum; Melosira sol; Neodenticula seminae; Nitzschia spp.; Odontella aurita; Paralia sulcata; Porosira glacialis; Proboscia eumorpha; Proboscia subarctica; Rhaphoneis spp.; Rhizosolenia borealis; Rhizosolenia hebetata; Rhizosolenia hebetata forma semispina; Rhizosolenia setigera; Rhizosolenia styliformis; Sample code/label; Sample code/label 2; Sample resolution; Sedimentation rate; Shionodiscus oestrupii; Shionodiscus trifultus; Slide; Southern Alaska Margin: Tectonics, Climate and Sedimentation; Stellarima stellaris; Stephanopyxis turris; Synedropsis spp.; Thalassionema nitzschioides; Thalassiosira aestivalis; Thalassiosira angulata; Thalassiosira anguste-lineata; Thalassiosira antarctica; Thalassiosira antarctica, resting spores; Thalassiosira baltica; Thalassiosira binata; Thalassiosira bulbosa; Thalassiosira decipiens; Thalassiosira eccentrica; Thalassiosira gravida; Thalassiosira hispida; Thalassiosira hyalina; Thalassiosira jouseae; Thalassiosira kushirensis; Thalassiosira kushirensis, resting spores; Thalassiosira leptopus; Thalassiosira lineata; Thalassiosira nordenskioeldii; Thalassiosira pacifica; Thalassiosira sp.; Thalassiosira spp.; Thalassiosira symmetrica; Thalassiosira tenera; Thalassiothrix longissima; Transect length; Transect width
    Type: Dataset
    Format: text/tab-separated-values, 3933 data points
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  • 9
    Publication Date: 2023-11-25
    Keywords: 341-U1421A; 341-U1421C; Accumulation rate, ice rafted debris; AGE; Density, dry bulk; Depth, bottom/max; Depth, composite; Depth, composite bottom; Depth, composite top; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp341; Ice rafted debris; Ice rafted debris, general; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Joides Resolution; Sample code/label; Sample code/label 2; Sedimentation rate; Size fraction 〈 0.063 mm, mud, silt+clay; Size fraction 0.200-0.063 mm, fine sand; Size fraction 2.000-0.630 mm, coarse sand; Size fraction 4.0-2.0 mm, very fine gravel, granule; Southern Alaska Margin: Tectonics, Climate and Sedimentation; Total
    Type: Dataset
    Format: text/tab-separated-values, 3962 data points
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  • 10
    Publication Date: 2023-11-25
    Keywords: 341-U1421A; 341-U1421C; Adercotryma glomeratum; AGE; Astrononion gallowayi; Bolivina alata; Bolivina decussata; Bolivina pacifica; Bolivina sp.; Bolivina spissa; Bryozoa; Buccella frigida; Buccella tenerrima; Bulimina marginospinata; Bulimina spp.; Bulimina striata; Bulimina subacuminata; Cassidulina reniforme; Cassidulina teretis; Cassidulina tortuosa; Chilostomella sp.; Cibicides spp.; Cordilleran Ice Sheet; Counting 〉150 µm fraction; Cyclammina cancellata; deglacial; Depth, bottom/max; Depth, composite; Depth, composite bottom; Depth, composite top; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elphidiella hannai; Elphidium bartletti; Elphidium excavatum; Elphidium frigidum; Elphidium oregononse; Elphidium spp.; Elphidium subarcticum; Epistominella pacifica; Epistominella sp.; Eubulimina exilis; Event label; Exp341; Factor; Fissurina lucida; Foraminifera; Foraminifera, benthic, high productive group; Foraminifera, benthic, meltwater group; Foraminifera, benthic, other; Foraminifera, benthic, total; Foraminifera, planktic, other; Foraminifera, planktic, total; Foraminifera, planktic/benthic ratio; Globigerina bulloides; Globigerina quinqueloba; Globigerina umbilicata; Globigerinita uvula; Globobulimina spp.; Globocassidulina subglobosa; Globorotalia scitula; Gulf of Alaska; Gyroidina spp.; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Islandiella norcrossi; Islandiella sp.; Joides Resolution; Karreriella baccata; Lagena spp.; Lenticulina spp.; LGM; Melonis sp.; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma sinistral; Nonionella auricula; Nonionella sp.; Nonionellina labradorica; Oolina apiopleura; Oolina spp.; Orbulina universa; Oridorsalis umbonatus; Ostracoda; Planulina ariminensis; Planulina sp.; Planulina wuellerstorfi; Pullenia salisburyi; Pyrgo lucernula; Quinqueloculina akneriana; Quinqueloculina lamarckiana; Quinqueloculina sp.; Quinqueloculina stalkeri; Reophax sp.; Sample code/label; Sample code/label 2; Sample resolution; Sample volume; Sedimentation rate; Southern Alaska Margin: Tectonics, Climate and Sedimentation; Split; Takayanagia delicata; Trifarina fluens; Triloculina trihedra; Trochammina sp.; Uvigerina peregrina; Uvigerina spp.; Valvulineria sp.
    Type: Dataset
    Format: text/tab-separated-values, 10575 data points
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