A Holocene history of dynamic water column redox conditions in the Landsort Deep, Baltic Sea

Abstract. The Baltic Sea, one of the world's largest brackish-marine basins, established after deglaciation of Scandinavia about 17 000 to 15 000 yr ago. In the changeable history of the Baltic Sea, the initial freshwater system was connected to the North Sea about 8000 yr ago and the modern brackish-marine setting (Littorina Sea) was established. Today, a relatively stable stratification has developed in the water column of the deep basins due to salinity differences. Stratification is only occasionally interrupted by mixing events, and it controls nutrient availability and growth of specifically adapted microorganisms and algae. We studied bacteriohopanepolyols (BHPs), lipids of specific bacterial groups, in a sediment core from the central Baltic Sea (Gotland Deep) and found considerable differences between the distinct stages of the Baltic Sea's history. Some individual BHP structures indicate contributions from as yet unknown redoxcline-specific bacteria (bacteriohopanetetrol isomer), methanotrophic bacteria (35-aminobacteriohopanetetrol), cyanobacteria (bacteriohopanetetrol cyclitol ether isomer) and from soil bacteria (adenosylhopane) through allochthonous input after the Littorina transgression, whereas the origin of other BHPs in the core has still to be identified. Notably high BHP abundances were observed in the deposits of the brackish-marine Littorina phase, particularly in laminated sediment layers. Because these sediments record periods of stable water column stratification, bacteria specifically adapted to these conditions may account for the high portions of BHPs. An additional and/or accompanying source may be nitrogen-fixing (cyano)bacteria, which is indicated by a positive correlation of BHP abundances with Corg and δ15N.

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Bacteriohopanepolyols record stratification, nitrogen fixation and other biogeochemical perturbations in Holocene sediments of the Central Baltic Sea

Biogeosciences Discussions ◽

10.5194/bgd-9-17139-2012 ◽

2012 ◽

Vol 9 (12) ◽

pp. 17139-17165

Author(s):

M. Blumenberg ◽

C. Berndmeyer ◽

M. Moros ◽

M. Muschalla ◽

O. Schmale ◽

...

Keyword(s):

Baltic Sea ◽

Water Column ◽

Stable Stratification ◽

The Baltic Sea ◽

Allochthonous Input ◽

The North ◽

Water Column Stratification ◽

Gotland Deep ◽

History Of ◽

The Baltic

Abstract. The Baltic Sea, one of the world's largest brackish-marine basins, established after deglaciation of Scandinavia about 17 000 to 15 000 yr ago. In the changeable history of the Baltic Sea, the initial freshwater system was connected to the North Sea about 8000 yr ago and the modern brackish-marine setting (Littorina Sea) was established. Today, a relatively stable stratification developed in the water column of the deep basins due to salinity differences. Stratification is only occasionally interrupted by mixing events, and controls nutrient availability and growth of specifically adapted microorganisms and algae. We studied bacteriohopanepolyols (BHPs), lipids of specific bacterial groups, in a sediment core from the Central Baltic Sea (Gotland Deep) and found considerable differences between the distinct stages of the Baltic Sea's history. Individual BHP structures indicate contributions from as yet unknown redoxcline-specific bacteria (bacteriohopanetetrol isomer), methanotrophic bacteria (35-aminobacteriohopanetetrol), cyanobacteria (bacteriohopanetetrol cyclitol ether isomer) and, through allochthonous input after the Littorina transgression, from soil bacteria (adenosylhopane), whereas the origin of other BHPs in the core has still to be identified. Notably high BHP abundances were observed in the deposits of the brackish-marine Littorina phase, particularly in laminated sediment layers. Because these sediments record periods of stable water column stratification, bacteria specifically adapted to these conditions may account for the high portions of BHPs. An additional and/or accompanying source may be nitrogen-fixing (cyano)bacteria, which is indicated by a good correlation of BHP abundances with Corg and δ15N.

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Sedimentary fluxes of trace metals, radioisotopes and greenhouse gases in the southwestern Baltic Sea Cruise No. AL543, 23.08.2020 – 28.08.2020, Kiel – Kiel - SEDITRACE

10.3289/cr_al543 ◽

2020 ◽

Author(s):

Florian Scholz

Keyword(s):

Greenhouse Gases ◽

Baltic Sea ◽

Water Column ◽

Redox Conditions ◽

Element Cycling ◽

Original Plan ◽

Kiel Bight ◽

Sediment Sampling ◽

Different Types ◽

The Impact

R/V Alkor Cruise AL543 was planned as a six-day cruise with a program of water column and sediment sampling in Kiel Bight and the western Baltic Sea. Due to restrictions related to the Covid-19 pandemic, the original plan had to be changed and the cruise was realized as six oneday cruises with sampling in Kiel Bight exclusively. The first day was dedicated to water column and sediment sampling for radionuclide analyses at Boknis Eck and Mittelgrund in Eckernförde Bay. On the remaining five days, water column, bottom water, sediment and pore water samples were collected at eleven stations covering different types of seafloor environment (grain size, redox conditions) in western Kiel Bight. The data and samples obtained on cruise AL543 will be used to investigate (i) the sedimentary cycling of bio-essential metals (e.g., nickel, zinc, and their isotopes) as a function of variable redox conditions, (ii) the impact of submarine groundwater discharge and diffusive benthic fluxes on the distribution of radium and radon as well as greenhouse gases (methane and nitrous oxide) in the water column, and (iii) to characterize and quantify the impact of coastal erosion on sedimentary iron, phosphorus and rare earth element cycling in Kiel Bight.

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Denitrification in the water column of the central Baltic Sea

Geochimica et Cosmochimica Acta ◽

10.1016/j.gca.2012.12.038 ◽

2013 ◽

Vol 106 ◽

pp. 247-260 ◽

Cited By ~ 52

Author(s):

Tage Dalsgaard ◽

Loreto De Brabandere ◽

Per O.J. Hall

Keyword(s):

Baltic Sea ◽

Water Column

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Contacts and Networks in the Baltic Sea Region

10.5117/9789462982635 ◽

2019 ◽

Keyword(s):

Baltic Sea ◽

Final Section ◽

Religious Studies ◽

The Baltic Sea ◽

Cultural Goods ◽

The Third ◽

Baltic Sea Region ◽

The World ◽

History Of ◽

The Baltic

Since prehistoric times, the Baltic Sea has functioned as a northern mare nostrum — a crucial nexus that has shaped the languages, folklore, religions, literature, technology, and identities of the Germanic, Finnic, Sámi, Baltic, and Slavic peoples. This anthology explores the networks among those peoples. The contributions to Contacts and Networks in the Baltic Sea Region: Austmarr as a Northern mare nostrum, ca. 500-1500 ad address different aspects of cultural contacts around and across the Baltic from the perspectives of history, archaeology, linguistics, literary studies, religious studies, and folklore. The introduction offers a general overview of crosscultural contacts in the Baltic Sea region as a framework for contextualizing the volume’s twelve chapters, organized in four sections. The first section concerns geographical conceptions as revealed in Old Norse and in classical texts through place names, terms of direction, and geographical descriptions. The second section discusses the movement of cultural goods and persons in connection with elite mobility, the slave trade, and rune-carving practice. The third section turns to the history of language contacts and influences, using examples of Finnic names in runic inscriptions and Low German loanwords in Finnish. The final section analyzes intercultural connections related to mythology and religion spanning Baltic, Finnic, Germanic, and Sámi cultures. Together these diverse articles present a dynamic picture of this distinctive part of the world.

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The History of Cyanobacterial Blooms in the Baltic Sea

AMBIO ◽

10.1579/0044-7447-30.4.172 ◽

2001 ◽

Vol 30 (4) ◽

pp. 172-178 ◽

Cited By ~ 140

Author(s):

Terttu Finni ◽

Kaisa Kononen ◽

Riitta Olsonen ◽

Kerstin Wallström

Keyword(s):

Baltic Sea ◽

Cyanobacterial Blooms ◽

The Baltic Sea ◽

History Of ◽

The Baltic

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Słowianie w Historii powszechnej Teofilakta Simokatty – bizantyńska perspektywa aksjologiczna

Slavia Meridionalis ◽

10.11649/sm.1335 ◽

2017 ◽

Vol 17 ◽

Author(s):

Anna Kotłowska

Keyword(s):

Roman Empire ◽

Baltic Sea ◽

High Reliability ◽

Sixth Century ◽

The Baltic Sea ◽

The Balkans ◽

Universal History ◽

History Of ◽

The Baltic

Slavs in Theophylact Simocatta’s „Universal History” – a Byzantine axiological perspectiveThe Universal History of Theophylact Simocatta constitutes a very important source for the history of the Later Roman Empire, especially within the context of appearance of the Avars and the Slavs in the Balkans. This article confirms the high reliability and great value of Theophylact’ s narrative concerning the Slavs in the last two decades of the sixth century. In the second part, some new remarks have been given, which argue for the authenticity of the famous episode about Slavs “living at the end of the Western Ocean” (6.2). Moreover, the author is firmly convinced that the so-called Western Ocean should be identified with the Baltic Sea. Słowianie w Historii powszechnej Teofilakta Simokatty – bizantyńska perspektywa aksjologiczna Historia powszechna Teofilakta Simokatty stanowi bardzo istotne źródło do dziejów późnego Cesarstwa Rzymskiego, m.in. w kontekście pojawienia się Awarów i Słowian na Bałkanach. Przedłożony artykuł potwierdza wysoką wiarygodność i faktograficzne znaczenie narracji Teofilakta odnośnie do Słowiańszczyzny ostatnich dwóch dziesięcioleci VI wieku. Druga część artykułu zawiera nową argumentację na rzecz autentyczności słynnego epizodu o Słowianach „mieszkających przy krańcu zachodniego Oceanu”. Autorka jest przekonana, że tzw. „zachodni Ocean” należy utożsamić z Morzem Bałtyckim.

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