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  • 2010-2014  (6)
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  • 1
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    A Cenozoic record of the equatorial Pacific carbonate compensation depth (2012)
    Nature Publishing Group
    In:  Nature, 488 (7413). pp. 609-614.
    Details
    Publication Date: 2017-03-01
    Description: Atmospheric carbon dioxide concentrations and climate are regulated on geological timescales by the balance between carbon input from volcanic and metamorphic outgassing and its removal by weathering feedbacks; these feedbacks involve the erosion of silicate rocks and organic-carbon-bearing rocks. The integrated effect of these processes is reflected in the calcium carbonate compensation depth, which is the oceanic depth at which calcium carbonate is dissolved. Here we present a carbonate accumulation record that covers the past 53 million years from a depth transect in the equatorial Pacific Ocean. The carbonate compensation depth tracks long-term ocean cooling, deepening from 3.0-3.5 kilometres during the early Cenozoic (approximately 55 million years ago) to 4.6 kilometres at present, consistent with an overall Cenozoic increase in weathering. We find large superimposed fluctuations in carbonate compensation depth during the middle and late Eocene. Using Earth system models, we identify changes in weathering and the mode of organic-carbon delivery as two key processes to explain these large-scale Eocene fluctuations of the carbonate compensation depth.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
    DOI: 10.1038/nature11360
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Impacts of elevated CO2 concentration on the productivity and surface energy budget of the soybean and maize agroecosystem in the Midwest U.S (2013)
    Wiley-Blackwell
    Details
    Publication Date: 2013-05-30
    Description: The physiological response of vegetation to increasing atmospheric carbon dioxide concentration ([CO 2 ]) modifies productivity and surface energy and water fluxes. Quantifying this response is required for assessments of future climate change. Many global climate models account for this response; however, significant uncertainty remains in model simulations of this vegetation response and its impacts. Data from in situ field experiments provide evidence that previous modeling studies may have overestimated the increase in productivity at elevated [CO 2 ], and the impact on large-scale water cycling is largely unknown. We parameterized the Agro-IBIS dynamic global vegetation model with observations from the SoyFACE experiment to simulate the response of soybean and maize to an increase in [CO 2 ] from 375 ppm to 550 ppm. The two key model parameters that were found to vary with [CO 2 ] were the maximum carboxylation rate of photosynthesis and specific leaf area. Tests of the model that used SoyFACE parameter values showed a good fit to site-level data for all variables except latent heat flux over soybean and sensible heat flux over both crops. Simulations driven with historic climate data over the central U.S. showed that increased [CO 2 ] resulted in decreased latent heat flux and increased sensible heat flux from both crops when averaged over 30 years. Thirty-year average soybean yield increased everywhere (~10%); however, there was no increase in maize yield except during dry years. Without accounting for CO 2 effects on the maximum carboxylation rate of photosynthesis and specific leaf area, soybean simulations at 550 ppm overestimated leaf area and yield. Our results highlight important model parameter values that, if not modified in other models, could result in biases when projecting future crop-climate-water relationships. This article is protected by copyright. All rights reserved.
    Print ISSN: 1354-1013
    Electronic ISSN: 1365-2486
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Published by Wiley-Blackwell
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    PAPER CURRENT
  • 3
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    Seismic multichannel reflection profiles from the Gulf of Cadiz, IODP Expedition 339 (2014)
    PANGAEA
    In:  Supplement to: Hernandéz-Molina, Francisco Javier; Stow, Dorrik A V; Alvarez Zarikian, Carlos A; Acton, Gary D; Bahr, André; Balestra, Barbara; Ducassou, Emmanuelle; Flood, Roger D; Flores, José-Abel; Furota, Satoshi; Grunert, Patrick; Hodell, David A; Jiménez-Espejo, Francisco Jose; Kim, Jin Kyoung; Krissek, Lawrence A; Kuroda, Junichiro; Li, Bill; Llave, Estefania; Lofi, Johanna; Lourens, Lucas Joost; Miller, Max; Nanayama, Futoshi; Nishida, Naohisa; Richter, Carl; Roque, C; Pereira, H; Sanchez Goñi, Maria Fernanda; Sierro, Francisco Javier; Singh, Arun Deo; Sloss, Craig; Takashimizu, Yasuhiro; Tzanova, Alexandrina; Voelker, Antje H L; Williams, Trevor J; Xuan, Chuang (2014): Onset of Mediterranean Outflow into the North Atlantic. Science, 344(6189), 1244-1250, https://doi.org/10.1126/science.1251306
    Details
    Publication Date: 2024-05-06
    Description: Sediments cored along the southwestern Iberian margin during Integrated Ocean Drilling Program Expedition 339 provide constraints on Mediterranean Outflow Water (MOW) circulation patterns from the Pliocene epoch to the present day. After the Strait of Gibraltar opened (5.33 million years ago), a limited volume of MOW entered the Atlantic. Depositional hiatuses indicate erosion by bottom currents related to higher volumes of MOW circulating into the North Atlantic, beginning in the late Pliocene. The hiatuses coincide with regional tectonic events and changes in global thermohaline circulation (THC). This suggests that MOW influenced Atlantic Meridional Overturning Circulation (AMOC), THC, and climatic shifts by contributing a component of warm, saline water to northern latitudes while in turn being influenced by plate tectonics.
    Keywords: Event label; Exp339; File format; File size; Gulf of Cádiz, Atlantic Ocean; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Latitude of event; Latitude of event 2; Longitude of event; Longitude of event 2; Mediterranean Outflow; P74-45; PD00-833; Reference/source; Seismic reflection profile; SEISREFL; Uniform resource locator/link to graphic
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    (Supplementary Table 1) Carbonate accumulation rate dataset of the equatorial Pacific (2012)
    PANGAEA
    Details
    Publication Date: 2024-05-06
    Keywords: 199-1215A; 199-1217A; 199-1217B; 199-1218A; 199-1218B; 199-1218C; 199-1219A; 199-1220A; 199-1220B; 320-U1331A; 320-U1331C; 320-U1332A; 320-U1332B; 320-U1333A; 320-U1333B; 320-U1334A; 320-U1335A; 320-U1336A; 321-U1337A; 321-U1337B; 321-U1338A; 321-U1338B; 85-574; 85-574C; 8-69; 8-69A; 8-70; 8-70A; Accumulation rate, calcium carbonate; Accumulation rate, mass; AGE; Calcium carbonate; Calculated; Center for Marine Environmental Sciences; Deep Sea Drilling Project; Density, dry bulk; DEPTH, sediment/rock; Depth, sediment revised; DRILL; Drilling/drill rig; DSDP; Event label; Exp320; Exp321; Glomar Challenger; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; LATITUDE; Leg199; Leg8; Leg85; LONGITUDE; MARUM; North Pacific/BASIN; North Pacific/TROUGH; North Pacific Ocean; Ocean Drilling Program; ODP; Pacific Equatorial Age Transect I; Pacific Equatorial Age Transect II / Juan de Fuca; Paleoelevation; Reference/source; Sample code/label; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 34059 data points
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    DATA PANGAEA
  • 5
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    Carbonate compensation depth (CCD) of the of the equatorial Pacific (2012)
    PANGAEA
    Details
    Publication Date: 2024-05-06
    Keywords: AGE; Center for Marine Environmental Sciences; Deep Sea Drilling Project; Depth, reference; DSDP; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; MARUM; Ocean Drilling Program; ODP
    Type: Dataset
    Format: text/tab-separated-values, 228 data points
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    DATA PANGAEA
  • 6
    facet.materialart.
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    Carbonate compensation depth (CCD) reconstruction of the equatorial Pacific (2012)
    PANGAEA
    In:  Supplement to: Pälike, Heiko; Lyle, Mitchell W; Nishi, Hiroshi; Raffi, Isabella; Ridgwell, Andy; Gamage, Kusali; Klaus, Adam; Acton, Gary D; Anderson, Louise; Backman, Jan; Baldauf, Jack G; Beltran, Catherine; Bohaty, Steven M; Bown, Paul R; Busch, William H; Channell, James E T; Chun, Cecily O J; Delaney, Margaret Lois; Dewang, Pawan; Dunkley Jones, Tom; Edgar, Kirsty M; Evans, Helen F; Fitch, Peter; Foster, Gavin L; Gussone, Nikolaus; Hasegawa, Hitoshi; Hathorne, Ed C; Hayashi, Hiroki; Herrle, Jens O; Holbourn, Ann E; Hovan, Steven A; Hyeong, Kiseong; Iijima, Koichi; Ito, Takashi; Kamikuri, Shin-Ichi; Kimoto, Katsunori; Kuroda, Junichiro; Leon-Rodriguez, Lizette; Malinverno, Alberto; Moore, Theodore C; Murphy, Brandon; Murphy, Daniel P; Nakamur, Hideto; Ogane, Kaoru; Ohneiser, Christian; Richter, Carl; Robinson, Rebecca S; Rohling, Eelco J; Romero, Oscar E; Sawada, Ken; Scher, Howie D; Schneider, Leah; Sluijs, Appy; Takata, Hiroyuki; Tian, Jun; Tsujimoto, Akira; Wade, Bridget S; Westerhold, Thomas; Wilkens, Roy H; Williams, Trevor J; Wilson, Paul A; Yamamoto, Yuhji; Yamamoto, Shinya; Yamazaki, Toshitsugu; Zeebe, Richard E (2012): A Cenozoic record of the equatorial Pacific carbonate compensation depth. Nature, 488, 609-614, https://doi.org/10.1038/nature11360
    Details
    Publication Date: 2024-05-06
    Description: Atmospheric carbon dioxide concentrations and climate are regulated on geological timescales by the balance between carbon input from volcanic and metamorphic outgassing and its removal by weathering feedbacks; these feedbacks involve the erosion of silicate rocks and organic-carbon-bearing rocks. The integrated effect of these processes is reflected in the calcium carbonate compensation depth, which is the oceanic depth at which calcium carbonate is dissolved. Here we present a carbonate accumulation record that covers the past 53 million years from a depth transect in the equatorial Pacific Ocean. The carbonate compensation depth tracks long-term ocean cooling, deepening from 3.0-3.5 kilometres during the early Cenozoic (approximately 55 million years ago) to 4.6 kilometres at present, consistent with an overall Cenozoic increase in weathering. We find large superimposed fluctuations in carbonate compensation depth during the middle and late Eocene. Using Earth system models, we identify changes in weathering and the mode of organic-carbon delivery as two key processes to explain these large-scale Eocene fluctuations of the carbonate compensation depth.
    Keywords: Center for Marine Environmental Sciences; Deep Sea Drilling Project; DSDP; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; MARUM; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
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