Lovisa Zillen - Academia.edu (original) (raw)

Papers by Lovisa Zillen

Research paper thumbnail of The Anthropocene in the northern Baltic Sea – the case of contaminated fiberbanks and implications for sustainable development

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Research paper thumbnail of Stable lead (Pb) isotopes and concentrations – A useful independent dating tool for Baltic Sea sediments

Quaternary Geochronology, Apr 1, 2012

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Research paper thumbnail of Past periods of rapid environmental change - the dinoflagellate cyst signal

Gff, Mar 1, 2011

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Research paper thumbnail of TOC content and LOI of sediment core POS435_164-1

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Research paper thumbnail of Hypoxia and cyanobacteria blooms - are they really natural features of the late Holocene history of the Baltic Sea?

Biogeosciences, Aug 31, 2010

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Research paper thumbnail of Is ‘deep-water formation’ in the Baltic Sea a key to understanding seabed dynamics and ventilation changes over the past 7,000 years?

Quaternary International, Jun 1, 2020

Abstract Numerous hydro-acoustic studies of the seabed of the Baltic Sea have revealed the unusua... more Abstract Numerous hydro-acoustic studies of the seabed of the Baltic Sea have revealed the unusual occurrence of sediment contourite drifts and re-suspension at greater water depths. In addition, radiocarbon dating of bulk sediments indicates significant age reversals. We present new geophysical, sediment proxy data (including extensive radiocarbon dating) and hydrographic measurements, which are combined with results of numerous marine geological studies performed during the last decades. These data indicate that a deep-water formation process significantly affected the seabed dynamics during regional climatically cold phases during the last c. 7,000 years. We propose that, during the colder periods (e.g. the Little Ice Age), newly formed bottom waters likely caused widespread re-suspension of organic carbon-rich laminated sediments that were deposited during the preceding warm periods in shallower areas, and this material was transported to and re-deposited in the deeper parts of the Baltic Sea sub-basins. In our scenario, a topographic feature, known as the Baltic Sea Klint, acted as a hydrographic barrier for deep-water formed in the northern Baltic. Thus, during the cold periods increased lateral matter influx from the northern Baltic led to the accumulation of much thicker macroscopically homogenous clayey sediments in sub-basins north of the Klint. Moreover, deep-water formation produced bottom currents that led to the formation of sediment contourite drifts at water depths of >200 m in the Bothnian Sea, the Aland Deep and northern central Baltic Sea sub-basins. Bottom water ventilation in the Baltic Sea is generally assumed to be determined solely by the inflow of oxygen-rich, saline water from the North Sea, but we challenge this assumption and postulate that deep-water formation is a key process that ventilates the bottom waters of the Baltic Sea during climatically cold periods with substantial implications for its sedimentary archive.

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Research paper thumbnail of Magnetic enhancement of Baltic Sea sapropels by greigite magnetofossils

Earth and Planetary Science Letters, Mar 1, 2013

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Research paper thumbnail of Bulk sediment14C dating in an estuarine environment: How accurate can it be?

Paleoceanography, Feb 1, 2017

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Research paper thumbnail of Paleoenvironmental Significance of Varved Lake Sediments in Fennoscandia and their Contribution to PAGES Related Programs

Pages (Bern), Jul 1, 1999

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Research paper thumbnail of Hypoxia and cyanobacterial blooms are not natural features of the Baltic Sea

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Research paper thumbnail of Towards an event stratigraphy for Baltic Sea sediments deposited since AD 1900: approaches and challenges

Boreas, Oct 24, 2016

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Research paper thumbnail of Validating a Swedish varve chronology using radiocarbon, palaeomagnetic secular variation, lead pollution history and statistical correlation

Quaternary Geochronology, Dec 1, 2010

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Research paper thumbnail of SST reconstruction and TOC concentration of Baltic Sea sediment cores

The transition from hunter-gatherer-fisher groups to agrarian societies is arguably the most sign... more The transition from hunter-gatherer-fisher groups to agrarian societies is arguably the most significant change in human prehistory. In the European plain there is evidence for fully developed agrarian societies by 7,500 cal. yr BP, yet a well-established agrarian society does not appear in the north until 6,000 cal. yr BP for unknown reasons. Here we show a sudden increase in summer temperature at 6,000 cal. yr BP in northern Europe using a well-dated, high resolution record of sea surface temperature (SST) from the Baltic Sea. This temperature rise resulted in hypoxic conditions across the entire Baltic sea as revealed by multiple sedimentary records and supported by marine ecosystem modeling. Comparison with summed probability distributions of radiocarbon dates from archaeological sites indicate that this temperature rise coincided with both the introduction of farming, and a dramatic population increase. The evidence supports the hypothesis that the boundary of farming rapidly extended north at 6,000 cal. yr BP because terrestrial conditions in a previously marginal region improved.

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Research paper thumbnail of Cumulative impact assessment for ecosystem-based marine spatial planning

Science of The Total Environment, 2020

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Research paper thumbnail of Climate induced human demographic and cultural change in northern Europe during the mid-Holocene

Scientific Reports, 2017

The transition from hunter-gatherer-fisher groups to agrarian societies is arguably the most sign... more The transition from hunter-gatherer-fisher groups to agrarian societies is arguably the most significant change in human prehistory. In the European plain there is evidence for fully developed agrarian societies by 7,500 cal. yr BP, yet a well-established agrarian society does not appear in the north until 6,000 cal. yr BP for unknown reasons. Here we show a sudden increase in summer temperature at 6,000 cal. yr BP in northern Europe using a well-dated, high resolution record of sea surface temperature (SST) from the Baltic Sea. This temperature rise resulted in hypoxic conditions across the entire Baltic sea as revealed by multiple sedimentary records and supported by marine ecosystem modeling. Comparison with summed probability distributions of radiocarbon dates from archaeological sites indicate that this temperature rise coincided with both the introduction of farming, and a dramatic population increase. The evidence supports the hypothesis that the boundary of farming rapidly e...

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Research paper thumbnail of TOC content, LOI and SST reconstruction of sediment core PAP_303600

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Research paper thumbnail of How Do Continuous High-Resolution Models of Patchy Seabed Habitats Enhance Classification Schemes?

Geosciences, 2019

Predefined classification schemes and fixed geographic scales are often used to simplify and cost... more Predefined classification schemes and fixed geographic scales are often used to simplify and cost-effectively map the spatial complexity of nature. These simplifications can however limit the usefulness of the mapping effort for users who need information across a different range of thematic and spatial resolutions. We demonstrate how substrate and biological information from point samples and photos, combined with continuous multibeam data, can be modeled to predictively map percentage cover conforming with multiple existing classification schemes (i.e., HELCOM HUB; Natura 2000), while also providing high-resolution (5 m) maps of individual substrate and biological components across a 1344 km2 offshore bank in the Baltic Sea. Data for substrate and epibenthic organisms were obtained from high-resolution photo mosaics, sediment grab samples, legacy data and expert annotations. Environmental variables included pixel and object based metrics at multiple scales (0.5 m–2 km), which impr...

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Research paper thumbnail of Occurrence of varved lake sediment sequences in Varmland, west central Sweden: lake characteristics, varve chronology and AMS radiocarbon dating

Boreas, 2008

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Research paper thumbnail of Complexity of the 8 ka climate event in Sweden recorded by varved lake sediments

Boreas, 2009

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Research paper thumbnail of Radiocarbon wiggle matching of Swedish lake varves reveals asynchronous climate changes around the 8.2 kyr cold event

Boreas, 2010

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Research paper thumbnail of The Anthropocene in the northern Baltic Sea – the case of contaminated fiberbanks and implications for sustainable development

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stable lead (Pb) isotopes and concentrations – A useful independent dating tool for Baltic Sea sediments

Quaternary Geochronology, Apr 1, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Past periods of rapid environmental change - the dinoflagellate cyst signal

Gff, Mar 1, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of TOC content and LOI of sediment core POS435_164-1

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Hypoxia and cyanobacteria blooms - are they really natural features of the late Holocene history of the Baltic Sea?

Biogeosciences, Aug 31, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Is ‘deep-water formation’ in the Baltic Sea a key to understanding seabed dynamics and ventilation changes over the past 7,000 years?

Quaternary International, Jun 1, 2020

Abstract Numerous hydro-acoustic studies of the seabed of the Baltic Sea have revealed the unusua... more Abstract Numerous hydro-acoustic studies of the seabed of the Baltic Sea have revealed the unusual occurrence of sediment contourite drifts and re-suspension at greater water depths. In addition, radiocarbon dating of bulk sediments indicates significant age reversals. We present new geophysical, sediment proxy data (including extensive radiocarbon dating) and hydrographic measurements, which are combined with results of numerous marine geological studies performed during the last decades. These data indicate that a deep-water formation process significantly affected the seabed dynamics during regional climatically cold phases during the last c. 7,000 years. We propose that, during the colder periods (e.g. the Little Ice Age), newly formed bottom waters likely caused widespread re-suspension of organic carbon-rich laminated sediments that were deposited during the preceding warm periods in shallower areas, and this material was transported to and re-deposited in the deeper parts of the Baltic Sea sub-basins. In our scenario, a topographic feature, known as the Baltic Sea Klint, acted as a hydrographic barrier for deep-water formed in the northern Baltic. Thus, during the cold periods increased lateral matter influx from the northern Baltic led to the accumulation of much thicker macroscopically homogenous clayey sediments in sub-basins north of the Klint. Moreover, deep-water formation produced bottom currents that led to the formation of sediment contourite drifts at water depths of >200 m in the Bothnian Sea, the Aland Deep and northern central Baltic Sea sub-basins. Bottom water ventilation in the Baltic Sea is generally assumed to be determined solely by the inflow of oxygen-rich, saline water from the North Sea, but we challenge this assumption and postulate that deep-water formation is a key process that ventilates the bottom waters of the Baltic Sea during climatically cold periods with substantial implications for its sedimentary archive.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Magnetic enhancement of Baltic Sea sapropels by greigite magnetofossils

Earth and Planetary Science Letters, Mar 1, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Bulk sediment14C dating in an estuarine environment: How accurate can it be?

Paleoceanography, Feb 1, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Paleoenvironmental Significance of Varved Lake Sediments in Fennoscandia and their Contribution to PAGES Related Programs

Pages (Bern), Jul 1, 1999

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Hypoxia and cyanobacterial blooms are not natural features of the Baltic Sea

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Towards an event stratigraphy for Baltic Sea sediments deposited since AD 1900: approaches and challenges

Boreas, Oct 24, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Validating a Swedish varve chronology using radiocarbon, palaeomagnetic secular variation, lead pollution history and statistical correlation

Quaternary Geochronology, Dec 1, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of SST reconstruction and TOC concentration of Baltic Sea sediment cores

The transition from hunter-gatherer-fisher groups to agrarian societies is arguably the most sign... more The transition from hunter-gatherer-fisher groups to agrarian societies is arguably the most significant change in human prehistory. In the European plain there is evidence for fully developed agrarian societies by 7,500 cal. yr BP, yet a well-established agrarian society does not appear in the north until 6,000 cal. yr BP for unknown reasons. Here we show a sudden increase in summer temperature at 6,000 cal. yr BP in northern Europe using a well-dated, high resolution record of sea surface temperature (SST) from the Baltic Sea. This temperature rise resulted in hypoxic conditions across the entire Baltic sea as revealed by multiple sedimentary records and supported by marine ecosystem modeling. Comparison with summed probability distributions of radiocarbon dates from archaeological sites indicate that this temperature rise coincided with both the introduction of farming, and a dramatic population increase. The evidence supports the hypothesis that the boundary of farming rapidly extended north at 6,000 cal. yr BP because terrestrial conditions in a previously marginal region improved.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Cumulative impact assessment for ecosystem-based marine spatial planning

Science of The Total Environment, 2020

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Climate induced human demographic and cultural change in northern Europe during the mid-Holocene

Scientific Reports, 2017

The transition from hunter-gatherer-fisher groups to agrarian societies is arguably the most sign... more The transition from hunter-gatherer-fisher groups to agrarian societies is arguably the most significant change in human prehistory. In the European plain there is evidence for fully developed agrarian societies by 7,500 cal. yr BP, yet a well-established agrarian society does not appear in the north until 6,000 cal. yr BP for unknown reasons. Here we show a sudden increase in summer temperature at 6,000 cal. yr BP in northern Europe using a well-dated, high resolution record of sea surface temperature (SST) from the Baltic Sea. This temperature rise resulted in hypoxic conditions across the entire Baltic sea as revealed by multiple sedimentary records and supported by marine ecosystem modeling. Comparison with summed probability distributions of radiocarbon dates from archaeological sites indicate that this temperature rise coincided with both the introduction of farming, and a dramatic population increase. The evidence supports the hypothesis that the boundary of farming rapidly e...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of TOC content, LOI and SST reconstruction of sediment core PAP_303600

Bookmarks Related papers MentionsView impact

Research paper thumbnail of How Do Continuous High-Resolution Models of Patchy Seabed Habitats Enhance Classification Schemes?

Geosciences, 2019

Predefined classification schemes and fixed geographic scales are often used to simplify and cost... more Predefined classification schemes and fixed geographic scales are often used to simplify and cost-effectively map the spatial complexity of nature. These simplifications can however limit the usefulness of the mapping effort for users who need information across a different range of thematic and spatial resolutions. We demonstrate how substrate and biological information from point samples and photos, combined with continuous multibeam data, can be modeled to predictively map percentage cover conforming with multiple existing classification schemes (i.e., HELCOM HUB; Natura 2000), while also providing high-resolution (5 m) maps of individual substrate and biological components across a 1344 km2 offshore bank in the Baltic Sea. Data for substrate and epibenthic organisms were obtained from high-resolution photo mosaics, sediment grab samples, legacy data and expert annotations. Environmental variables included pixel and object based metrics at multiple scales (0.5 m–2 km), which impr...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Occurrence of varved lake sediment sequences in Varmland, west central Sweden: lake characteristics, varve chronology and AMS radiocarbon dating

Boreas, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Complexity of the 8 ka climate event in Sweden recorded by varved lake sediments

Boreas, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Radiocarbon wiggle matching of Swedish lake varves reveals asynchronous climate changes around the 8.2 kyr cold event

Boreas, 2010

Bookmarks Related papers MentionsView impact