Phytoplankton trends in the Baltic Sea

Wasmund, N.; Uhlig, Steffen

doi:10.1016/s1054-3139(02)00280-1

Cited by 177 publications

(126 citation statements)

References 12 publications

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“…eutrophication. Eutrophication would cause a decline in overall diatom abundance, as diatoms are often replaced by cyanobacteria (O'Neil et al, 2012;Michalak et al, 2013) and dinoflagellates (Wasmund and Uhlig, 2003) in cases of high levels of nutrient loading. In turn, this would lead to a shallowing of the photic zone resulting from sunlight being rapidly absorbed by cyanobacteria and dinoflagellates in the upper water column, as seen in the low B : P ratio.…”

Section: Salinity and Productivity Changesmentioning

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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Section: Salinity and Productivity Changesmentioning

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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“…Pawlak et al, 2009;Wasmund and Uhlig, 2003). Nutrients, such as phosphate and nitrate, stemming from, for example, sewage and fertiliser usage in agriculture drive enhanced primary production by phytoplankton at the sun-lit surface of the Baltic Sea.…”

Section: Introductionmentioning

confidence: 99%

MOMBA 1.1 – a high-resolution Baltic Sea configuration of GFDL's Modular Ocean Model

2014

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Abstract. We present a new coupled ocean-circulation-ice model configuration of the Baltic Sea. The model features, contrary to most existing configurations, a high horizontal resolution of ≈ 1 nautical mile (≈ 1.85 km), which is eddyresolving over much of the domain. The vertical discretisation comprises a total of 47 vertical levels. Results from a 1987 to 1999 hindcast simulation show that the model's fidelity is competitive. As suggested by a comparison with sea surface temperatures observed from space, this applies especially to near-surface processes. Hence, the configuration is well suited to serve as a nucleus of a fully fledged coupled ocean-circulation-biogeochemical model (which is yet to be developed). A caveat is that the model fails to reproduce major inflow events. We trace this back to spurious vertical circulation patterns at the sills which may well be endemic to high-resolution models based on geopotential coordinates. Further, we present indications that -so far neglected -eddy/wind effects exert significant control on windinduced up-and downwelling.

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“…Biological activity is much higher in the southern, warmer, part of the Baltic Sea. Additional force here include significant amounts of nutrients entering the Baltic with large continental rivers draining agriculturally transformed catchment areas (Wasmund and Uhlig, 2003;Wasmund and Siegel, 2008;HELCOM, 2009). The biological activity, including the ratio between photosynthesis and respiration in particular, determines the level and dynamics of CO 2 partial pressure (pCO 2 ) in seawater and hence a strength and direction of CO 2 exchange through the seawater/atmosphere interface.…”

Section: Introductionmentioning

confidence: 99%

The carbon budget of the Baltic Sea

Kuliński

Pempkowiak

2011

Biogeosciences

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Abstract. This paper presents the results of a comprehensive study of the Baltic Sea carbon budget. The Baltic Sea is very much influenced by terrestrial carbon input. Rivers are the largest carbon source, and their input amounts to 10.90 Tg C yr −1 (Tg = 10 12 g) with a 37.5 % contribution of organic carbon. On the other hand, carbon is effectively exported from the Baltic to the North Sea (7.67 Tg C yr −1 ) and is also buried in bottom sediments (2.73 Tg C yr −1 ). The other sources and sinks of carbon are of minor importance. The net CO 2 emission (1.05 Tg C yr −1 ) from the Baltic to the atmosphere was calculated as the closing term of the carbon budget presented here. There is a net loss of organic carbon, which indicates that the Baltic Sea is heterotrophic.

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Phytoplankton trends in the Baltic Sea

Cited by 177 publications

References 12 publications

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)

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)

MOMBA 1.1 – a high-resolution Baltic Sea configuration of GFDL's Modular Ocean Model

The carbon budget of the Baltic Sea

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