urn:ieda:metadataabout:10.15784-600127
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Dataset
Interdisciplinary Earth Data Alliance
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2018-05-17
ISO 19139 Geographic Information - Metadata - Implementation Specification
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Southern Ocean Diatom Taphonomy and Paleoproductivity: A Laboratory Study of Silica Degradation and Export
2014
publication
doi:10.15784/600127
Haji-Sheikh, Michael
Northern Illinois University, DeKalb, IL, 60115, US
author
Scherer, Reed Paul
Department of Geology and Environmental Geosciences, Northern Illinois University, DeKalb, IL, 60115, USA
reed@geol.niu.edu
author
U.S. Antarctic Program (USAP) Data Center
publisher
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.
funderName:NSF:GEO:PLR:Antarctic Earth Sciences
awardNumber:1043690
awardTitle:Southern Ocean Diatom Taphonomy and Paleoproductivity: A Laboratory Study of Silica Degradation and Export
Complete
Haji-Sheikh, Michael
Northern Illinois University, DeKalb, IL, 60115, US
pointOfContact
Diatom
living thing
Antarctic Earth Sciences
program
Sediment Core
sampling feature
Biology
IEDA data type categories
IEDA integrated catalog keyword vocabulary
2017-10-11
creation
Antarctica
Marine Sediments
Southern Ocean
IEDA feature of interest
IEDA integrated catalog keyword vocabulary
2017-10-11
creation
Biosphere
Oceans
IEDA topic
IEDA integrated catalog keyword vocabulary
2017-10-11
creation
US Antarctic Program Data Center (USAP-DC)
Data Center
Creative Commons Attribution-NonCommercial-Share Alike 3.0 United States [CC BY-NC-SA 3.0]
Creative Commons Attribution-NonCommercial-Share Alike 3.0 United States [CC BY-NC-SA 3.0]
eng
geoscientificInformation
2010-12-15
2013-11-30
http://dx.doi.org/10.15784/600127
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http://www.usap-dc.org/view/dataset/600127
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This metadata record was generated by an xslt transformation from a DataCite metadata record; The transform was created by Damian Ulbricht and Stephen M. Richard. 2017-11-15 these records include new IEDA keywords for geoportal facets Run on 2018-06-21T19:05:24-07:00
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