USAP-DC

[{"dataset_id": "600127", "west": -180, "east": 180, "south": -90, "north": -60, "gid": 330, "geometry": "0101000020E610000000000000000000000E2DB29DEF7F56C0", "cross_dateline": false, "bounds_geometry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}]

{"@context": "https://schema.org/", "@type": "Dataset", "@id": "doi:10.15784/600127", "additionalType": ["geolink:Dataset", "vivo:Dataset"], "name": "Southern Ocean Diatom Taphonomy and Paleoproductivity: A Laboratory Study of Silica Degradation and Export", "description": "Intellectual Merit: Diatom abundance in sediment cores is typically used as a proxy for paleo primary productivity. This record is complicated by variable preservation, with most loss occurring in the water column via dissolution and zooplankton grazing. This study will investigate preservational biases via a series of controlled experiments to create proxies of original productivity based on morphological changes associated with diatom dissolution and fracture. The PIs will utilize fresh diatoms from culture. Specific objectives include: (1) Linking changes in diatom morphology to availability of dissolved silica and other physical and chemical parameters; (2) Documenting the dissolution process under controlled conditions; (3) Assessment of changes in morphology and diatom surface roughness with increased dissolution; (4) Documenting the physical effects of grazing and fecal pellet formation on diatom fragmentation and dissolution; and (5) Analyzing the impact of diatom dissolution on silica and carbon export. These objectives will be achieved by growing Southern Ocean diatom species in the laboratory under differing physical and chemical conditions; controlled serial dissolution experiments on cultured diatoms; analysis of the dissolution process by imaging frustules under scanning electron microscopy (SEM) and with micro-analysis of surface texture by atomic force microscopy (AFM); making the cultures available to krill and other live zooplankton crustaceans in order to analyze the specific effects of grazing and pelletization on diatom morphology; and comparing experimental results with natural plankton, sediment trap material, and selected Holocene, Pleistocene and Pliocene sediment core material.\nBroader impacts: This work will contribute to understanding of the use of diatom abundance as an indicator of paleoproductivity. The proposed experiments are multi-disciplinary in nature. Importantly, the project was designed, and the proposal largely written, by a Ph.D. candidate. The research proposed here will lead to peer-reviewed publications and provide a base for future studies over the course of an extremely promising scientific career. The project will also support an undergraduate research student at NIU. The PI is heavily involved in science outreach, including classroom visits, museum events and webinars related to evolution and climate change, and is active with NSF-funded outreach activities linked to the ANDRILL and WISSARD programs. He will continue these efforts with this project.", "citation": "Haji-Sheikh, M., & Scherer, R. P. (2014) \"Southern Ocean Diatom Taphonomy and Paleoproductivity: A Laboratory Study of Silica Degradation and Export\" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/600127.", "datePublished": "2014", "keywords": ["Antarctica", "Biota", "Biota", "Diatom", "Marine Sediments", "Oceans", "Sediment Core", "Southern Ocean"], "creator": [{"@type": "Person", "additionalType": "geolink:Person", "name": "Haji-Sheikh, Michael", "email": "", "affiliation": {"@type": "Organization", "name": "Northern Illinois University"}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Scherer, Reed Paul", "email": "reed@niu.edu", "affiliation": {"@type": "Organization", "name": "Department of Geology and Environmental Geosciences, Northern Illinois University"}}], "distribution": [{"@type": "DataDownload", "additionalType": "http://www.w3.org/ns/dcat#DataCatalog", "encodingFormat": "text/xml", "name": "ISO Metadata Document", "url": "https://www.usap-dc.org/metadata/isoxml/600127iso.xml", "contentUrl": "/dataset/filename"}, {"@type": "DataDownload", "@id": "http://dx.doi.org/10.15784/600127", "additionalType": "dcat:distribution", "url": "http://dx.doi.org/10.15784/600127", "name": "landing page", "description": "Link to a web page related to the resource.. Service Protocol: Link to a web page related to the resource.. Link Function: information", "contentUrl": "/dataset/filename", "encodingFormat": "text/html"}, {"@type": "DataDownload", "@id": "https://www.usap-dc.org/view/dataset/600127", "additionalType": "dcat:distribution", "url": "https://www.usap-dc.org/view/dataset/600127", "name": "landing page", "description": "Link to a web page related to the resource.. Service Protocol: Link to a web page related to the resource.. Link Function: information", "contentUrl": "/dataset/filename", "encodingFormat": "text/html"}], "identifier": {"@type": "PropertyValue", "propertyID": "https://registry.identifiers.org/registry/doi", "value": "doi:10.15784/600127", "url": "https://doi.org/10.15784/600127"}, "contributor": [{"@type": "Role", "roleName": "credit", "description": "funderName:NSF:GEO:PLR:Antarctic Earth Sciences awardNumber:1043690 awardTitle:Southern Ocean Diatom Taphonomy and Paleoproductivity: A Laboratory Study of Silica Degradation and Export"}], "license": [{"@type": "CreativeWork", "URL": "https://creativecommons.org/licenses/by-nc/4.0/", "name": "MD_Constraints", "description": "useLimitation: Creative Commons Attribution-NonCommercial v4.0 Generic [CC BY-NC 4.0]."}, {"@type": "CreativeWork", "name": "MD_LegalConstraints", "description": "accessConstraints: license. otherConstraints: Creative Commons Attribution-NonCommercial v4.0 Generic [CC BY-NC 4.0]."}, {"@type": "CreativeWork", "name": "MD_SecurityConstraints", "description": "classification: "}], "publisher": {"@type": "Organization", "name": "U.S. Antarctic Program (USAP) Data Center"}, "spatialCoverage": [{"@type": "Place", "geo": {"@type": "GeoShape", "box": "-180, -90, 180, -60"}}]}

Southern Ocean Diatom Taphonomy and Paleoproductivity: A Laboratory Study of Silica Degradation and Export Data DOI: https://doi.org/10.15784/600127 Cite as Haji-Sheikh, M., & Scherer, R. P. (2014) "Southern Ocean Diatom Taphonomy and Paleoproductivity: A Laboratory Study of Silica Degradation and Export" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/600127. AMD - DIF Record(s) NSF-ANT10-43690_1 Abstract Intellectual Merit: Diatom abundance in sediment cores is typically used as a proxy for paleo primary productivity. This record is complicated by variable preservation, with most loss occurring in the water column via dissolution and zooplankton grazing. This study will investigate preservational biases via a series of controlled experiments to create proxies of original productivity based on morphological changes associated with diatom dissolution and fracture. The PIs will utilize fresh diatoms from culture. Specific objectives include: (1) Linking changes in diatom morphology to availability of dissolved silica and other physical and chemical parameters; (2) Documenting the dissolution process under controlled conditions; (3) Assessment of changes in morphology and diatom surface roughness with increased dissolution; (4) Documenting the physical effects of grazing and fecal pellet formation on diatom fragmentation and dissolution; and (5) Analyzing the impact of diatom dissolution on silica and carbon export. These objectives will be achieved by growing Southern Ocean diatom species in the laboratory under differing physical and chemical conditions; controlled serial dissolution experiments on cultured diatoms; analysis of the dissolution process by imaging frustules under scanning electron microscopy (SEM) and with micro-analysis of surface texture by atomic force microscopy (AFM); making the cultures available to krill and other live zooplankton crustaceans in order to analyze the specific effects of grazing and pelletization on diatom morphology; and comparing experimental results with natural plankton, sediment trap material, and selected Holocene, Pleistocene and Pliocene sediment core material. Broader impacts: This work will contribute to understanding of the use of diatom abundance as an indicator of paleoproductivity. The proposed experiments are multi-disciplinary in nature. Importantly, the project was designed, and the proposal largely written, by a Ph.D. candidate. The research proposed here will lead to peer-reviewed publications and provide a base for future studies over the course of an extremely promising scientific career. The project will also support an undergraduate research student at NIU. The PI is heavily involved in science outreach, including classroom visits, museum events and webinars related to evolution and climate change, and is active with NSF-funded outreach activities linked to the ANDRILL and WISSARD programs. He will continue these efforts with this project. Creator(s): Haji-Sheikh, Michael; Scherer, Reed Paul Date Created: 2014-01-01 Repository: USAP-DC (current) - LDEO-LEGACY (original) License: Creative Commons Attribution-NonCommercial v4.0 Generic [CC BY-NC 4.0] Spatial Extent(s) West: -180, East: 180, South: -90, North: -60 Temporal Extent(s) Start: 2010-12-15 - End: 2013-11-30 Award(s) NSF 1043690 Version: 1 Related Project(s) Southern Ocean Diatom Taphonomy and Paleoproductivity: A Laboratory Study of Silica Degradation and Export Keywords Antarctica Biota Biota Diatom Marine Sediments Oceans Sediment Core Southern Ocean