Integrated Ocean Drilling Program Expedition 347 preliminary report; Baltic Sea Basin paleoenviornment; paleoenvironmental evolution of the Baltic Sea Basin through the last glacial cycle; platform operations, 12 September-1 November 2013; onshore science party, 22 January-20 February 2014

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doi: 10.2204/iodp.pr.347.2014
Author(s): Andren, Thomas; Jorgensen, Bo Barker; Cotterill, Carol; Fehr, Annick; Green, Sophie; Andren, Elinor; Ash, Jeanine; Bauersachs, Thorsten; Cragg, Barry; Fanget, Anne-Sophie; Granoszewski, Wojciech; Groeneveld, Jeroen; Hardisty, Dalton; Herrero-Bervera, Emilio; Hyttinen, Outi; Jensen, Jorn Bo; Johnsson, Sean; Kenzlere, Michael; Kotilainen, Aarno; Kotthoff, Ulrich; Marshall, Ian P. G.; Martin, Ellen; Obrochta, Stephen; Passchier, Sandra; Krupinski, Nadine Quintana; Riedinger, Natascha; Slomp, Caroline; Snowball, Ian; Stepanova, Anna; Strano, Sarah; Torti, Andrea; Warnock, Jonathan; Xiao, Nan; Rui Zhang
Integrated Ocean Drilling Program, Expedition 347 Scientists, College Station, TX
Author Affiliation(s): Primary:
Sodertorn University, School of Natural Sciences, Technology and Environmental Studies, Huddinge, Sweden
Other:
Aarhus University, Denmark
Britih Geological Survey, United Kingdom
RWTH Aachen University, Germany
University of California at Los Angeles, United States
Christian Albrechts University of Kiel, Germany
Cardiff University, United Kingdom
Polish Geological Institute, Poland
University of Bremen, Germany
Source: Preliminary Report (Integrated Ocean Drilling Program), Vol.347, 102p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9423
Note: In English. 110 refs.
Summary: Integrated Ocean Drilling Program Expedition 347 aimed to retrieve sediments from different settings of the Baltic Sea, encompassing the last interglacial-glacial cycle to address scientific questions along four main research themes: 1. Climate and sea level dynamics of marine isotope Stage (MIS) 5, including onsets and terminations; 2. Complexities of the last glacial, MIS 4-MIS 2; 3. Glacial and Holocene (MIS -MIS 1) climate forcing; and 4. Deep biosphere in Baltic Sea Basin (BSB) sediments. These objectives were accomplished by drilling in six subbasins: (1) the gateway of the Baltic Sea Basin (BSB) (Anholt), where we focused on sediments from MIS 6-5 as well as MIS 2-1; (2) a subbasin in the southwestern BSB (Little Belt) that possibly holds a unique MIS 5 record; (3, 4) two subbasins in the south (Bornholm Basin and Hano Bay) that may hold long complete records from MIS 4-2; (5) a 450 m deep subbasin in the central Baltic (Landsort Deep) that promised to contain a thick and continuous record of the last ∼14,000 y; and (6) a subbasin in the very north (Angermanalven River estuary) that contains a uniquely varved (annually deposited) sediment record of the last 10,000 y. These six areas were expected to contain sediment sequences representative of the last ∼140,000 y, with paleoenvironmental in formation relevant on a semicontinental scale due to the Baltic Sea draining an area four times as large as the basin itself. The location of the BSB in the heartland of a recurrently waning and waxing ice sheet, the Scandinavian Ice Sheet (SIS), has resulted in a complex development: repeated glaciations of different magnitude, sensitive responses to sea level and gateway threshold changes, large shifts in sedimentation patterns, and high sedimentation rates. Its position also makes it a unique link between Eurasian and northwest European terrestrial records. Therefore, the sediments of this largest European intracontinental basin form a rare archive of climate evolution over the last glacial cycle. High sedimentation rates provide an excellent opportunity to reconstruct climatic variability of global importance at a unique resolution from a marine-brackish setting. Comparable sequences cannot be retrieved anywhere in the surrounding onshore regions. Furthermore, and crucially, the large variability (salinity, climate, sedimentation, and oxygenation) that the BSB has undergone during the last glacial cycle makes it optimal for new research on the deep biosphere and its evolution and biogeochemical processes in a changing environment. The BSB also provides a model for how post-glacial diffusive penetration of seawater ions has altered the chemical environment and microbial physiology in the subseafloor biosphere. It is envisaged that the transect of drilled sites, from west to east and from south to north, in this repeatedly glaciated and environmentally very dynamic region will add totally new scientific insights into a variety of research fields. These involve, for example, regional and global issues on the timing and forcing of rapid climate and sea level changes, on mechanisms behind hypoxia-driven processes in intracontinental sea basins, and on the glacial history of the SIS and its interaction with the climate system. The drilled sites will also give new insight into the controlling mechanisms for prokaryotic communities and underlying biogeochemical processes in the seabed. New data will show how the highly variable environment has affected the phylogenetic diversity of the microbial communities and which biogeochemical processes predominate today in the deep glacial and interglacial deposits. An extraordinary large set of biological, physical (including a variety of dating and paleomagnetic methods), chemical, and biogeochemical methods, as well as a set of novel approaches, have been applied to the drilled sediments.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 20 Geophysics, Applied; 24 Surficial Geology, Quaternary Geology; Algae; Ancylus Lake; Arthropoda; Atlantic Ocean; Baltic Sea; Baltic ice lake; Biostratigraphy; Biota; Boreholes; Cenozoic; Chemostratigraphy; Climate forcing; Cores; Crustacea; Deglaciation; Diatoms; Expedition 347; Foraminifera; Fresh-water environment; Geomicrobiology; Geophysical methods; Geophysical profiles; Geophysical surveys; Glacial environment; Glaciation; Holocene; IODP Site M0059; IODP Site M0060; IODP Site M0061; IODP Site M0062; IODP Site M0063; IODP Site M0064; IODP Site M0065; IODP Site M0066; IODP Site M0067; Integrated Ocean Drilling Program; Interglacial environment; Invertebrata; Lithostratigraphy; Littorina Sea; Lower Holocene; MIS 1; MIS 2; MIS 3; MIS 4; MIS 5; Magnetic properties; Magnetic susceptibility; Magnetostratigraphy; Mandibulata; Marine environment; Marine sediments; Microfossils; Microorganisms; North Atlantic; Ostracoda; Paleo-oceanography; Paleoclimatology; Paleoenvironment; Paleogeography; Paleomagnetism; Palynomorphs; Physical properties; Plantae; Pleistocene; Pore water; Protista; Quaternary; Scandinavian ice sheet; Sea-level changes; Sediments; Seismic methods; Seismic profiles; Surveys; Upper Pleistocene; Upper Quaternary; Yoldia Sea
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Record ID: 2014037229
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