Expedition 347 summary

Andrén, Thomas; Jørgensen, B.B.; Cotterill, C.; Green, S.; Andrén, Elinor; Ash, Jeanine L.; Bauersachs, Thorsten; Cragg, Barry A.; Fanget, A.-S.; Fehr, A.; Granoszewski, Wojciech; Groeneveld, Jeroen; Herrero‐Bervera, Emilio; Hyttinen, Outi; Jensen, J.B.; Johnson, Sean; Kenzler, Michael; Kotilainen, Aarno; Kotthoff, Ulrich; Marshall, I.P.G.; Martin, E.; Obrochta, Stephen; Passchier, Sandra; Krupinski, N. Quintana; Riedinger, Natascha; Slomp, Caroline P.; Snowball, Ian; Stepanova, A.; Strano, S.; Torti, A.; Warnock, Jonathan P.; Xiao, Nan; Zhang, R.

doi:10.2204/iodp.proc.347.101.2015

Cited by 15 publications

(36 citation statements)

References 98 publications

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“…F13). Although all physical property measurements described in "Physical properties" in the "Methods" chapter (Andrén et al, 2015a) were conducted for Site M0062, discrete P-wave and thermal conductivity data are too sparsely distributed to exhibit any discernable downcore trend. Noncontact electrical resistivity data also show little variability.…”

Section: Physical Propertiesmentioning

confidence: 99%

“…Magnetic susceptibility measurements and rudimentary analyses of the natural remanent magnetization (NRM) were made on discrete specimens of known volume and mass (see "Paleomagnetism" in the "Methods" chapter [Andrén et al, 2015a]). A total of 290 discrete samples were taken from Holes M0062A (161 samples), M0062C (40 samples), and M0062D (89 samples) according to the site splice, with a higher density of samples taken in the upper 9 m. Magnetic susceptibility ranges between 0.07 × 10 -6 and 0.55 × 10 -6 m 3 /kg through the sequence, with the highest value found within Unit II, a well-sorted dark gray fine to medium sand.…”

Section: Paleomagnetismmentioning

confidence: 99%

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Site M0062

Andrén¹,

Jørgensen²,

Cotterill³

et al. 2015

Proceedings of the IODP

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IntroductionDuring Integrated Ocean Drilling Program (IODP) Expedition 347, cores were recovered from four holes at Site M0062 (Ånger-manälven River estuary), with an average site recovery of 99%. In addition, two shallow gravity (Rumohr) cores were acquired. The water depth was 69.3 m, with no tidal range. Existing data sets, including seismic reflection profiles, were evaluated prior to each site to attempt to guide the initial drilling with an anticipated lithologic breakdown. The total time spent on station was 1.03 days. Operations Transit to Hole M0062AOperations in Hole M0061C were completed at 1220 h on 5 October 2013. The vessel then awaited the arrival of a pilot at 1600 h before transiting to Hole M0062A (proposed Site BSB-11). Hole M0062AThe vessel arrived on site at 1810 h on 5 October 2013 and commenced operations, having built the dynamic positioning (DP) model ( Table T1). The uppermost 0.5 m was not cored because of the potential presence of harmful contaminants associated with historic paper mill outputs. In accordance with the risk assessment, additional personal protective equipment (PPE) was worn for the first core runs at this site.Eleven piston cores and one hammer sample were collected at this site on 5-6 October. As at Site M0061, the end of the hole was called when drilling encountered the sand lithology underlying the varved sequence. In this hole, the operation was terminated at 35.90 meters below seafloor (mbsf), and the vessel prepared to move over to Hole M0062B.A total of 12 coring attempts were made in Hole M0062A, along with one open-hole section at the surface (to avoid coring contaminated sediments). The maximum hole depth was 35.90 mbsf with a recovery of 97.41% (inclusive of the open-hole 0.5 m) and 97.82% when the open-hole interval is removed from the calculation.

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Section: Physical Propertiesmentioning

confidence: 99%

Section: Paleomagnetismmentioning

confidence: 99%

Site M0062

Andrén¹,

Jørgensen²,

Cotterill³

et al. 2015

Proceedings of the IODP

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“…To improve our understanding of the impact and magnitude of future environmental changes in the Baltic Sea region, it is essential to generate high-resolution paleoreconstructions in order to investigate how salinity and temperature varied in the past (e.g. Zillén et al, 2008;Andrén et al, 2015a;Ning et al, 2017). A multi-proxy approach, comprising proxies representative for bottom water, surface water, and air (terrestrial) conditions, is used here to reconstruct a wide array of environmental change (in particular temperature and salinity) from the same or closely neighbouring samples and thus how conditions simultaneously changed within the same age constraints.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: a multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059)

et al. 2017

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Abstract. Sediment records recovered from the Baltic Sea during Integrated Ocean Drilling Program Expedition 347 provide a unique opportunity to study paleoenvironmental and climate change in central and northern Europe. Such studies contribute to a better understanding of how environmental parameters change in continental shelf seas and enclosed basins. Here we present a multi-proxy-based reconstruction of paleotemperature (both marine and terrestrial), paleosalinity, and paleoecosystem changes from the Little Belt (Site M0059) over the past ∼ 8000 years and evaluate the applicability of inorganic-and organic-based proxies in this particular setting.All salinity proxies (diatoms, aquatic palynomorphs, ostracods, diol index) show that lacustrine conditions occurred in the Little Belt until ∼ 7400 cal yr BP. A connection to the Kattegat at this time can thus be excluded, but a direct connection to the Baltic Proper may have existed. The transition to the brackish-marine conditions of the Littorina Sea stage (more saline and warmer) occurred within ∼ 200 years when the connection to the Kattegat became established after ∼ 7400 cal yr BP. The different salinity proxies used here generally show similar trends in relative changes in salinity, but often do not allow quantitative estimates of salinity.Published by Copernicus Publications on behalf of the European Geosciences Union. U. Kotthoff et al.: Little Belt multi-proxy comparisonThe reconstruction of water temperatures is associated with particularly large uncertainties and variations in absolute values by up to 8 • C for bottom waters and up to 16 • C for surface waters. Concerning the reconstruction of temperature using foraminiferal Mg / Ca ratios, contamination by authigenic coatings in the deeper intervals may have led to an overestimation of temperatures. Differences in results based on the lipid paleothermometers (long chain diol index and TEX L 86 ) can partly be explained by the application of modern-day proxy calibrations to intervals that experienced significant changes in depositional settings: in the case of our study, the change from freshwater to marine conditions. Our study shows that particular caution has to be taken when applying and interpreting proxies in coastal environments and marginal seas, where water mass conditions can experience more rapid and larger changes than in open ocean settings. Approaches using a multitude of independent proxies may thus allow a more robust paleoenvironmental assessment.

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“…No corrections were made within the Expedition DIS for this, with top and bottom depths of sections (in meters below seafloor) calculated on the basis of the core-top depth. However, the operations summary table (see T1 in the "Expedition 347 summary" chapter [Andrén et al, 2015]) shows adjusted recovery percentages for holes with >100% suggested recovery.…”

Section: Data Handling Database Structure and Accessmentioning

confidence: 99%

“…Methods for postexpedition research conducted on Expedition 347 samples and data will be described in individual scientific contributions published after the OSP. Detailed drilling and engineering operations are described in "Operations" within each site chapter and "Operational strategy" in the "Expedition 347 summary" chapter (Andrén et al, 2015). The information in this chapter will enable future identification of data and samples for further scientific investigation by interested parties.…”

Section: Introduction and Coringmentioning

confidence: 99%

Methods

Andrén¹,

Jørgensen²,

Cotterill³

et al. 2015

Proceedings of the IODP

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This chapter documents the primary operational, curatorial, and analytical procedures and methods employed during the offshore and onshore phases of Integrated Ocean Drilling Program (IODP) Expedition 347. This information concerns only shipboard and Onshore Science Party (OSP) methodologies and data as described in the site chapters. Methods for postexpedition research conducted on Expedition 347 samples and data will be described in individual scientific contributions published after the OSP. Detailed drilling and engineering operations are described in "Operations" within each site chapter and "Operational strategy" in the "Expedition 347 summary" chapter (Andrén et al., 2015). The information in this chapter will enable future identification of data and samples for further scientific investigation by interested parties. Site locationsAll Expedition 347 sites (Fig. F1) were positioned using GPS coordinates supplied by the proponents and based on previous site surveys. As a number of holes were proposed at each site for different uses (e.g., paleoenvironment and microbiology), a central hole position was taken from the proponent-supplied coordinates (Hole A), and then additional positions were calculated radiating out from this position at 20 m intervals, with Holes B and C on either side of Hole A, running along the site survey seismic lines, and Holes D and E perpendicular to this orientation, again on either side of Hole A (Fig. F2). The spacing interval of 20 m between holes was chosen to limit drilling disturbance between holes while maintaining a close enough proximity to correlate between them, enabling the formation of a composite recovery and lithologic splice.Selected positions were relayed to the Hydrographic Surveyor from Geocean, and the Greatship Manisha was settled into position using a dynamic positioning (DP) system. To maintain station accurately within the required tolerance of <1 m for shallowwater sites, the DP system ran for 30-40 min at each location to build a reliable DP model, after which permission was granted to commence operations. Geocean supplied two transponder systems that were used during coring operations as backup for the DP system should there be a failure in the differential GPS (DGPS) signal because of satellite angles, particularly in the river estuary Methods 1

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Expedition 347 summary

Cited by 15 publications

References 98 publications

Site M0062

Site M0062

Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: a multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059)

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