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  • 1
    Book
    Book
    Recent changes in the marine environment in relation to climate, hydrography, and human impact - with special reference to fjords on the Swedish west coast (2003)
    Göteborg : Department of Earth Sciences
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Book
    Pages: Getr. Zählung , Ill., graph. Darst., Kt
    Series Statement: Earth Sciences Centre, Göteborg University 88
    Language: English
    Note: Zugl: Göteborg, Univ., Diss., 2003
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  • 2
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    Mg/Ca, Sr/Ca and Ca isotope ratios in benthonic foraminifers of surface sediment samples (2016)
    PANGAEA
    In:  Supplement to: Gussone, Nikolaus; Filipsson, Helena L; Kuhnert, Henning (2016): Mg/Ca, Sr/Ca and Ca isotope ratios in benthonic foraminifers related to test structure, mineralogy and environmental controls. Geochimica et Cosmochimica Acta, 173, 142-159, https://doi.org/10.1016/j.gca.2015.10.018
    Details
    Publication Date: 2023-03-03
    Description: We analysed Mg/Ca, Sr/Ca and Ca isotope ratios of benthonic foraminifers from sediment core tops retrieved during several research cruises in the Atlantic Ocean, in order to improve the understanding of isotope fractionation and element partitioning resulting from biomineralisation processes and changes in ambient conditions. Species include foraminifers secreting tests composed of hyaline low magnesium calcite, porcelaneous high magnesium calcite as well as aragonite. Our results demonstrate systematic isotope fractionation and element partitioning patterns specific for these foraminiferal groups. Calcium isotope fractionation is similar in porcelaneous and hyaline calcite tests and both groups demonstrate the previously described anomaly with enrichment of heavy isotopes around 3 - 4 °C (Gussone and Filipsson, 2010). Calcium isotope ratios of the aragonitic species Hoeglundina elegans, on the other hand, are about 0.4 per mil lighter compared to the calcitic species, which is in general agreement with stronger fractionation in inorganic aragonite compared to calcite. However, the low and strongly variable Sr content suggests additional processes during test formation, and we propose that transmembrane ion transport or a precursor phase to aragonite may be involved. Porcelaneous tests, composed of high Mg calcite, incorporate higher amounts of Sr compared to hyaline low Mg calcite, in agreement with inorganic calcite systematics, but also porcelaneous tests with reduced Mg/Ca show high Sr/Ca. While calcium isotopes, Sr/Ca and Mg/Ca in benthonic foraminifers primarily appear to fractionate and partition with a dominant inorganic control, d44/40Ca temperature and growth rate dependencies of benthonic foraminifer tests favour a dominant contribution of light Ca by transmembrane transport relative to unfractionated seawater Ca to the calcifying fluid, thus controlling the formation of foraminiferal d44/40Ca and Sr/Ca proxy signals.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 3
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    Benthic foraminifera abundance data of sediment core GeoB7926-2
    PANGAEA
    In:  Supplement to: McKay, Claire L; Filipsson, Helena L; Romero, Oscar E; Stuut, Jan-Berend W; Donner, Barbara (2014): Pelagic–benthic coupling within an upwelling system of the subtropical northeast Atlantic over the last 35 ka BP. Quaternary Science Reviews, 106, 299-315, https://doi.org/10.1016/j.quascirev.2014.04.027
    Details
    Publication Date: 2023-05-12
    Description: We present a high resolution, multiproxy study of the relationship between pelagic and benthic environments of a coastal upwelling system in the subtropical NE Atlantic Ocean. Marine sediments corresponding to late MIS3 to the Holocene in the radiocarbon dated core GeoB7926, retrieved off Mauritania (21°N) were analysed to reconstruct productivity in surface waters and its linkage to deep waters during the last 35 ka BP. High latitude cold events and changes in atmospheric and oceanographic dynamics influenced upwelling intensity over this time period. Subsequently, this caused changes in primary productivity off this low-latitude coastal upwelling locality. The benthic foraminiferal fauna displays four main community shifts corresponding to fundamental climatic events, first of all during late MIS3 (35-28 ka BP), secondly from 28 to 19 ka BP (including Heinrich event 2 and the LGM), thirdly within Heinrich event 1, the Bølling Allerød and the Younger Dryas (18-11.5 ka BP) and finally during the Holocene (11.5-0 ka BP). In particular, strong pelagic-benthic coupling is apparent in MIS 3, as demonstrated by increased primary productivity, indicated by moderate DAR and the dominance of benthic foraminiferal species which prefer fresh phytodetritus. A decline in upwelling intensity and nutrient availability follows, which resulted in a proportionately larger amount of older, degraded matter, provoking a shift in the benthic foraminifera fauna composition. This rapid response of the benthic environment continues with a progressive increase in upwelling intensity due to sea level and oceanographic changes and according high surface production during the LGM. During Heinrich event 1 and the Younger Dryas, extreme levels of primary production actually hindered benthic environment through the development of low oxygen conditions. After this period, a final change in benthic foraminiferal community composition occurs which indicates a return to more oxygenated conditions during the Holocene.
    Keywords: GeoB; Geosciences, University of Bremen
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 4
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    Grain size distribution and sea level changes in Gåsfjärden fjord (2016)
    PANGAEA
    In:  Supplement to: Ning, Wenxin; Tang, Jing; Filipsson, Helena L (2016): Long-term coastal openness variation and its impact on sediment grain-size distribution: a case study from the Baltic Sea. Earth Surface Dynamics, 4, 773-780, https://doi.org/10.5194/esurf-4-773-2016
    Details
    Publication Date: 2023-01-13
    Description: We analysed long-term variations in grain-size distribution in sediments from Gåsfjärden, a fjord-like inlet on the south-west Baltic Sea, and explored potential drivers of the recorded changes in sediment grain-size data. Over the last 5.4 thousand years (ka), the relative sea level decreased 17 m in the study region, caused by isostatic land uplift. As a consequence, Gåsfjärden has been transformed from an open coastal setting into a semi-closed inlet surrounded on the east by numerous small islands. To quantitatively estimate the morphological changes in Gåsfjärden over the last 5.4 ka and to further link the changes to our grain-size data, a digital elevation model (DEM)-based openness index was calculated. In the period between 5.4 and 4.4 ka BP, the inlet was characterised by the largest openness index. During this interval, the highest sand contents (~0.4 %) and silt/clay ratios (~0. 3) in the sediment sequence were recorded, indicating relatively high bottom water energy. After 4.4 ka BP, the average sand content was halved to ~0.2 % and the silt/clay ratios showed a significant decreasing trend over the last 4 ka. These changes are found to be associated with the gradual embayment of Gåsfjärden as represented in the openness index. The silt/clay ratios exhibited a delayed and slower change compared with the sand contents, which further suggest that finer particles are less sensitive to changes in hydrodynamic energy. Our DEM-based coastal openness index has proved to be a useful tool for interpreting the sedimentary grain-size record.
    Keywords: Baltic Sea; OS_VG31; PC; Piston corer
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 5
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    Grain size distribution of Gåsfjärden fjord (southeast of Swedish Baltic Sea coast) (2016)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: AGE; Baltic Sea; Grain size, sieving; OS_VG31; Particle Size Analyser SEDIGRAPH III, Micrometrics; PC; Piston corer; Sand; Silt; Silt/clay ratio; Size fraction 〈 0.002 mm, clay
    Type: Dataset
    Format: text/tab-separated-values, 234 data points
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  • 6
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    Relative sea level (to the present) of Baltic Sea over the last 5.4 thousand years (2016)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Age; AGE; Age, comment; Baltic Sea; OS_VG31; PC; Piston corer; Sea level, relative
    Type: Dataset
    Format: text/tab-separated-values, 111 data points
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  • 7
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    Seaward openness index estimated at different intervals in Gåsfjärden fjord (2016)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: AGE; Baltic Sea; Index; OS_VG31; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 378 data points
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  • 8
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    Landward openess index estimated at different intervals in Gåsfjärden fjord (2016)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: AGE; Baltic Sea; Index; OS_VG31; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 378 data points
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  • 9
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    (Appendix A) Oxygen and carbon isotopic data of living (stained) Stainforthia fusiformis from Havstens Fjord
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: DATE/TIME; DEPTH, sediment/rock; Havstens_Fjord; Havstens Fjord; Mass spectrometer Finnigan MAT 252; Mass spectrometer VG Prism Series II; MUC; MultiCorer; Stainforthia fusiformis, δ13C; Stainforthia fusiformis, δ18O
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
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  • 10
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    Stable carbon and oxygen isotope record of live benthic foraminifera from Swedish fjords
    PANGAEA
    In:  Supplement to: Filipsson, Helena L; Nordberg, Kjell; Gustafsson, Mikael (2004): Seasonal study of d18O and d13C in living (stained) benthic foraminifera from two Swedish fjords. Marine Micropaleontology, 53(1-2), 159-172, https://doi.org/10.1016/j.marmicro.2004.05.008
    Details
    Publication Date: 2023-05-12
    Description: In a previous 16-month seasonal study on living (stained) benthic foraminifera from two fjords on the Swedish west coast, it was reported that foraminifera proliferated in response to phytodetritus input; the strongest response came from the opportunistic species Stainforthia fusiformis. In this study, our objective was to find out if that phytodetritus input resulted in a change in the carbon isotopic composition of the foraminiferal tests. We also wanted to examine if variations in salinity and temperature (due to seasonality or deep-water exchanges) were reflected in the delta18O values. From S. fusiformis that were obtained from the Havstens Fjord (20 m) and the Gullmar Fjord (119 m) during the 16-month study, we developed a time series of delta18O and delta13C. After the spring blooms in the Havstens and the Gullmar Fjord, decreases of about 0.2 per mil to 0.3 per mil in the foraminiferal delta13C values were noted; in the Gullmar Fjord after the autumn blooms, decreases of the same order were also noted. Comparing the Havstens and the Gullmar Fjord, we found a 1 per mil difference in both delta13C and delta18O; we attribute this to hydrographic differences between the two fjords. Using calculated values of delta18O, together with the measured ones, we noticed that S. fusiformis in the Gullmar Fjord seems to calcify close to equilibrium with respect to the oxygen isotopes. During autumn, water temperatures were relatively high in the Havstens Fjord, and foraminiferal abundance in the fjord was also high after a phytodetritus input; but, the measured delta18O values do not reflect these higher temperatures. This apparently contradictory combination of results might be explained by a varying delta18O composition of the water during the year, which counterbalances the temperature effect.
    Keywords: Gullmar_Fjord; Gullmar Fjord, Skagerrak, Sweden; Havstens_Fjord; Havstens Fjord; MUC; MultiCorer
    Type: Dataset
    Format: application/zip, 2 datasets
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