GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Keywords: Baltic Sea. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (736 pages)
    Edition: 1st ed.
    ISBN: 9780470283127
    DDC: 551.46/1334
    Language: English
    Note: Intro -- STATE AND EVOLUTION OF THE BALTIC SEA, 1952-2005 -- CONTENTS -- Preface -- Contributors -- 1. Introduction -- 2. General Oceanography of the Baltic Sea -- 2.1 Specific Natural Conditions and Their Consequences -- 2.2 Estuarine Circulation -- 2.2.1 Long-Term Exchange -- 2.2.2 Short-Term Barotropic Exchange -- 2.2.3 Stratification and Mixing in the Channels -- 2.2.4 Quantifying the Stochastic Salt Exchange Associated with the Barotropic Water Exchange -- 2.3 Wind-Driven Currents -- 2.3.1 Ekman Current and Transport -- 2.3.2 Upwelling and Coastal Jets -- 2.4 Surface Waves, Tides, Seiches, Surges -- 2.4.1 Surface Gravity Waves -- 2.4.2 Seiches and Wind Stau -- 2.4.3 Tides -- 2.5 Kelvin Waves, Topographic Waves, and Eddies -- 2.5.1 Kelvin Waves -- 2.5.2 Coastal Trapped Waves and Continental Shelf Waves -- 2.5.3 Eddies -- 2.6 Internal Waves, Turbulence, Diapycnal Mixing -- 2.6.1 Introduction -- 2.6.2 Vertical Mixing in the Interior -- References -- 3. The History of Long-Term Observations in Warnemünde -- 3.1 Introduction -- 3.2 Shipborne Measurements at Fixed Stations -- 3.2.1 Basic Oceanographic Instrumentation for Shipborne Measurements -- 3.2.2 Oceanographic Observations in the 1950s and 1960s -- 3.2.3 International Cooperation 1969-2005 -- 3.2.4 Activities in the Frame of BMP, 1979-2005 -- 3.3 Buoy Stations and Measuring Platforms -- 3.3.1 The First Buoy Stations -- 3.3.2 MARNET Stations -- 3.3.3 Current Meter Stations in the Central Baltic Sea -- 3.4 Parameters Measured -- 3.5 Data Quality -- References -- 4. Weather of the Baltic Sea -- 4.1 Introduction -- 4.2 Extreme Weather Conditions -- 4.2.1 Hurricanes, Gales -- 4.2.2 Storm Surges -- 4.2.2.1 Features of the Northwest Situation -- 4.2.2.2 Features of the Northeast Situation -- 4.3 Special Weather Situations -- 4.3.1 Baltic Cyclones -- 4.3.2 Land and Sea Breeze. , 4.3.3 Warnemünder Wind -- 4.3.4 General Vb- and Omega-Weather Types -- 4.3.4.1 The Vb-Weather Type -- 4.3.4.2 The Omega-Weather Type -- 4.4 Greenhouse Effect -- Acknowledgment -- References -- 5. Baltic Climate Change -- 5.1 Introduction -- 5.2 Seasonal Cycles -- 5.3 Climatic Trends -- 5.4 Climatic Variability -- 5.4.1 Year-to-Year Fluctuations -- 5.4.2 Decadal Scale Changes -- 5.4.3 Possible Trigger Mechanisms -- 5.5 Conclusions and Outlook -- References -- 6. Current Observations in the Western Baltic Sea -- 6.1 Introduction -- 6.2 Great Belt and Fehmarnbelt -- 6.2.1 Great Belt -- 6.2.2 Fehmarnbelt -- 6.3 Arkona Sea West and Drogden Sill -- 6.3.1 Darss Sill -- 6.3.2 Drogden Sill -- 6.3.3 From Kriegers Flak to Hiddensee -- 6.4 Around Rügen -- 6.4.1 West Off Hiddensee -- 6.4.2 Wittow -- 6.4.3 Kap Arkona -- 6.4.4 Tromper Wiek -- 6.4.5 From Landtief A to Jan Heweliusz -- 6.4.6 Oderbank -- 6.5 Conclusions -- Acknowledgments -- References -- 7. Sea State, Tides -- 7.1 Sea State -- 7.1.1 History of Observation and Research -- 7.1.2 Observation and Measurement -- 7.1.3 Sea State Characteristics and Wave Generating Factors -- 7.1.3.1 Wind Sea Characteristics -- 7.1.3.2 Wave Height Frequency Distribution -- 7.1.3.3 Wave Spectra -- 7.1.3.4 Wave Generating and Wave Modifying Factors (Wind, Fetch, Wind Duration, Water Depth) -- 7.1.3.5 Special Phenomena (Air-Sea Temperature, Currents, Crossing Seas) -- 7.1.4 Calculation and Forecast of the Sea State -- 7.1.4.1 Empirical Wave Parameter Calculation -- 7.1.4.2 Empirical Wave Spectra -- 7.1.4.3 Numerical Models -- 7.1.5 Wave Climatology -- 7.1.5.1 Open Sea Wave Climate -- 7.1.5.2 Wave Climate of the Coastal Zone -- 7.1.6 Extreme Wave Conditions -- 7.2 Tides -- 7.2.1 History of Tidal Research in the Baltic Sea -- 7.2.2 Theory of Tides in the Baltic Sea and a Proper Model Concept. , 7.2.3 Modeling of Co-Oscillating and Direct Tides -- Acknowledgment -- References -- 8. Ice -- 8.1 Introduction -- 8.2 The Baltic Sea and Winter Time Maritime Transportation -- 8.3 Frequency of Ice Occurrence in the Baltic Sea as Well as Mean and Extreme Ice Parameters from Representative Stations in the Period 1956-2005 -- 8.4 Ice Conditions in the Baltic Sea and Adjacent Waters in 1956-2005 -- 8.4.1 Transition Area between the North Sea and Baltic Sea -- 8.4.1.1 Skagerrak and Kattegat -- 8.4.1.2 Belts and Sound -- 8.4.2 Western Baltic -- 8.4.3 Southern Baltic -- 8.4.4 Northern Baltic -- 8.4.5 Gulf of Riga -- 8.4.6 Gulf of Finland -- 8.4.7 Gulf of Bothnia -- 8.4.7.1 Sea of Åland -- 8.4.7.2 Archipelago Sea -- 8.4.7.3 Sea of Bothnia -- 8.4.7.4 Bay of Bothnia and the Quark -- 8.5 Classification of Ice Winters -- 8.5.1 Maximum Extent of Ice Coverage in the Baltic Sea 1720-2005 -- 8.5.1.1 Material -- 8.5.1.2 Classification of Ice Coverage -- 8.5.1.3 Analysis of Time Series -- 8.5.1.4 Ice Seasons 1956-2005 -- 8.5.2 Ice Winter Severity Indicator-Swedish Coast -- 8.5.3 Ice Winter Severity Indicator for the Southern Baltic Sea -- 8.5.4 Accumulated Areal Ice Volume for the Western Baltic Sea -- 8.5.5 Changes of Sea Ice Conditions in the Western Baltic from 1300 to Present -- References -- 9. Satellite-Derived Sea Surface Temperature for the Period 1990-2005 -- 9.1 Introduction -- 9.2 Methodology -- 9.3 Seasonal, Regional, and Interannual Variations of SST in the Baltic Sea -- 9.4 Trends in the Development of SST -- 9.5 Relation to Climate Indices -- 9.6 Regional Particularities in SST Patterns -- 9.6.1 Upwelling and Other Dynamical Features in the Baltic Sea -- 9.6.2 Oder River Discharge and Oder Flood -- 9.6.3 Coastal Wind-Driven Processes along the German Baltic Sea Coast -- 9.7 Summary and Conclusions -- Acknowledgment -- References. , 10. The Inflow of Highly Saline Water into the Baltic Sea -- 10.1 Introduction -- 10.2 The Causes of MBIs and Their Basic Impact on the Baltic Sea -- 10.3 The Statistical Analysis of Major Baltic Inflows -- 10.4 The Analysis of Selected Events -- 10.4.1 MBIs in the 1950s and 1960s -- 10.4.2 The 1970s -- 10.4.3 The Very Strong MBI in January 1993 -- 10.4.4 The Warm Water MBI in Autumn 1997 -- 10.4.5 The Specific MBI in January 2003 -- 10.5 The Analysis of Baroclinic Summer Inflows -- 10.6 The Effects of MBIs and Baroclinic Summer Inflows in the Central Baltic Deepwater -- 10.6.1 The Effects on the Hydrographic Parameters Temperature, Salinity, and Oxygen Concentration -- 10.6.2 The Effects on Inorganic Nutrients -- References -- 11. BALTIC: Monthly Time Series 1900-2005 -- 11.1 Introduction -- 11.2 Data Material -- 11.3 Quality Control and Uncertainties -- 11.3.1 IOW Data -- 11.3.2 SMHI Data -- 11.3.3 NERI Data -- 11.3.4 IMGW Data -- 11.3.5 Additional Data -- 11.4 Monthly Time Series 1900-2005 -- References -- 12. Nutrient Concentrations, Trends and Their Relation to Eutrophication -- 12.1 Introduction -- 12.2 Nutrient Inputs -- 12.3 Annual Inorganic Nutrient Cycles and Long Term Nutrient Trends in the Surface Layer -- 12.4 Inorganic Nutrient Reservoirs in the Deep Basins -- 12.5 Organic Nutrients -- 12.6 Conclusions -- References -- 13. Trace Metals in Baltic Seawater -- 13.1 The State of Knowledge until 1993 -- 13.2 Trace Metal Trends in the Western and Central Baltic Sea Between Saltwater Inflow Events in 1993 and 2003 -- 13.3 The Influence of Major Saltwater Inflow Events and Stagnant Anoxic Deepwater Conditions on Trace Metal Trends in the Gotland Deep -- 13.3.1 Pb, Cd, Cu, and Zn Trends "Above and Below Halocline" -- 13.3.2 Quantification of Trace Metal Fluxes across the Redox Interface Caused by Vertical Turbulent Mixing. , 13.3.3 The Relation between External and Internal Fluxes -- 13.4 Seasonal Particulate Trace Metal Fluxes across the Halocline in the Water Column of the Eastern Gotland Basin -- 13.4.1 Composition of Particles -- 13.4.2 Mass Fluxes of Main Components and Trace Metals -- 13.5 Flux and Budget Estimations of Cd, Cu, Pb, and Zn in the Surface Water of the Central Baltic Sea -- 13.6 Outlook -- Acknowledgment -- References -- 14. Sedimentary Records of Environmental Changes and Anthropogenic Impacts during the Past Decades -- 14.1 Changing Coastlines of the Baltic Sea -- 14.1.1 Introduction -- 14.1.2 The Geological/Tectonic Setting of the Baltic Area -- 14.1.3 Relative Sea-Level Change -- 14.1.4 Palaeogeography-Coastline Change -- 14.1.5 Summary -- Acknowledgment -- 14.2 Recent Sedimentation in the Eastern Gotland Basin: Spatial Patterns, Rates, and Drivers -- 14.2.1 Introduction -- 14.2.2 Spatial Distribution of Sedimentation Rates -- 14.2.3 Element Accumulation Rates -- 14.2.4 Vertical Versus Horizontal Fluxes of Biogenic Elements -- 14.2.5 Summary -- 14.3 Reconstruction of Pollution History in Sediment Cores from Different Baltic Sea Basins -- 14.3.1 Introduction and Background -- 14.3.2 Field Work and Laboratory Methods -- 14.3.3 Sediment Properties and Age Models -- 14.3.4 Heavy Metals and Organic Pollutants in the Sediment Cores -- 14.3.5 Inventories of Pollutants -- 14.3.6 Summary -- Acknowledgments -- 14.4 Repeated Geochemical Mapping of the Arkona Basin after 17 Years (1988 and 2005) -- 14.4.1 Introduction -- 14.4.2 Methodology -- 14.4.3 Results -- 14.4.4 General Sedimentology, Hydro- and Sediment Dynamics -- 14.4.5 Redox-Dependent Processes -- 14.4.6 Fe-Mn Microconcretions -- 14.4.7 Pollution (Heavy Metals) -- 14.4.8 Conclusions and Outlook -- 14.4.9 Summary -- Acknowledgments -- References -- 15. Phytoplankton. , 15.1 History of Phytoplankton Research and Methodology in the Baltic Sea.
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2021-02-08
    Description: Biogeochemical cycles of carbon, nutrients, and oxygen transmit mean states, trends and variations of the physical realm in coastal upwelling systems to their food webs and determine their role in regional budgets of greenhouse gases. This contribution focuses on biogeochemical processes in the northern Benguela Upwelling System (NBUS), where low oxygen levels in upwelling source water are a major influence on carbon and nutrient cycles. Based on measurements during numerous expeditions and results of 3-D regional ecosystem modeling (project GENUS; Geochemistry and Ecology of the Namibian Upwelling System) we here examine source water character, effects of low oxygen conditions on nutrient masses and ratios, and of diazotrophic N2-fixation on productivity of the system and its transition to the adjacent eastern South Atlantic. In available observations, the effects of denitrification in water and sediment and phosphate release from sediments are minor influences on nitrate:phosphate ratios of the system, and excess phosphate in aged upwelling water is inherited from upwelling source water. Contrary to expectation and model results, the low N:P ratios do not trigger diazotrophic N2-fixation in the fringes of the upwelling system, possibly due to a lack of seeding populations of Trichodesmium. We also examine the flux of carbon from the sea surface to either sediment, the adjacent sub-thermocline ocean, or to regenerated nutrients and CO2. Observed fluxes out of the surface mixed layer are significantly below modeled fluxes, and suggest that regeneration of nutrients and CO2 is unusually intense in the mixed layer. This contributes to very high fluxes of CO2 from the ocean to the regional atmosphere, which is not compensated for by N2-fixation. Based on observations, the NBUS thus is a significant net CO2 source (estimated at 14.8 Tg C a− 1), whereas the CO2 balance is closed by N2-fixation in the model. Methane concentrations were low in surface waters in on-line measurements during 1 expedition, and based on these our estimate for the emission of methane for the entire Benguela system is below 0.2 Tg CH4 a− 1.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    facet.materialart.
    Unknown
    Elsevier
    In:  Journal of Marine Systems, 73 (3-4). pp. 300-322.
    Publication Date: 2020-07-23
    Description: Literature data from 1905/06, 1912/13 and 1949/50 were compared with recent data (2001-2003) from Kiel Bight in order to investigate changes in phytoplankton composition and biomass, which may serve as indicators of environmental changes. In terms of biomass, diatomophyceae and dinophyceae are by far the most important groups. Their ratio is still close to unity. The share of diatomophyceae increased strongly in years with exceptionally high summer blooms (2001) or exceptionally early spring blooms (2003). The summer and autumn blooms of Chaetoceros and Skeletonema, detected in the early 20th century, are replaced by other diatoms (Cerataulina pelagica, Dactyliosolen fragilissimus, Proboscia alata, Pseudo-nitzschia spp.). Chaetoceros and Skeletonema are still important components of the spring blooms. Now as before, the autumn blooms are dominated by Ceratium spp., sometimes also by diatoms. Newly appearing bloom-forming species are mostly potentially toxic (Dicryocha speculum, Prorocentrum minimum, Pseudo-nitzschia spp.). The total phytoplankton biomass has roughly doubled in the course of the last century. The reference condition for phytoplankton biomass in Kiel Bight in the sense of the Water Framework Directive was defined at 55 mg C m(-3) (+/- 10%, annual mean). The mean annual biomass of diatomophyceae and dinophyceae was 25 mg C m-3 (+/- 40%) for each, indicating that the sum of their carbon biomass amounted to 90% (+/- 10%) of the total phytoplankton biomass on an annual average. Diatomophyceae represented at least 80% of carbon biomass in the spring bloom peak at the beginning of the 20th century
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 2015-09-25
    Description: In July 2007, phosphorus input by an upwelling event along the east coast of Gotland Island and the response of filamentous cyanobacteria were studied to determine whether introduced phosphorus can intensify cyanobacterial bloom formation in the eastern Gotland Basin. Surface temperature, nutrient concentrations, phytoplankton biomass and its stoichiometry, as well as phosphate uptake rates were determined in two transects between the coasts of Gotland and Latvia and in a short grid offshore of Gotland. In the upwelling area, surface temperatures of 11–12 °C and average dissolved inorganic phosphorus (DIP) concentrations of 0.26 μM were measured. Outside the upwelling, surface temperatures were higher (15.5–16.6 °C) and DIP supplies in the upper 10 m layer were exhausted. Nitrite and nitrate concentrations (0.01–0.22 μM) were very low within and outside the upwelling region. Abundances of filamentous cyanobacteria were highly reduced in the upwelling area, accounting for only 1.4–6.0% of the total phytoplankton biomass, in contrast to 18–20% outside the upwelling. The C:P ratio of filamentous cyanobacteria varied between 32.8 and 310 in the upwelling region, most likely due to the introduction of phosphorus-depleted organisms into the upwelling water. These organisms accumulate DIP in upwelling water and have lower C:P ratios as long as they remain in DIP-rich water. Thus, diazotrophic cyanobacteria benefit from phosphorus input directly in the upwelling region. Outside the upwelling region, the C:P ratios of filamentous cyanobacteria varied widely, between 240 and 463, whereas those of particulate material in the water ranged only between 96 and 224. To reduce their C:P ratio from 300 to 35, cyanobacteria in the upwelling region had to take up 0.05 mmol m−3 DIP, which is about 20% of the available DIP. Thus, a larger biomass of filamentous cyanobacteria may be able to benefit from a given DIP input. As determined from the DIP uptake rates measured in upwelling cells, the time needed to reduce the C:P ratio from 300 to 35 was too long to explain the huge bloom formations that typically occur in summer. However, phosphorus uptake rates increased significantly with increasing C:P ratios, allowing phosphorus accumulation within 4–5 days, a span of time suitable for bloom formation in July and August.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    facet.materialart.
    Unknown
    Elsevier
    In:  Journal of Marine Systems, 90 (1). pp. 67-76.
    Publication Date: 2015-09-25
    Description: Cyanobacteria blooms in the Baltic Sea appear after upwelling events, which transport phosphate-rich intermediate water to the surface. The growth potential of diazotrophic cyanobacteria in upwelled water was studied in a mesocosm (tank) experiment in summer 2007. An Anabaena bloom was only induced in the tanks filled with upwelled surface water but not in those filled with surface water from outside the upwelling cell and with intermediate water. The low initial cyanobacteria biomass in the intermediate water could not grow to bloom concentrations within three weeks. It is concluded that mixing of upwelled water with surrounding surface water forms a precondition for a cyanobacteria bloom. An additional mesocosm experiment conducted in 2009 revealed that mixing of intermediate water with surface water had the same stimulating effect on nitrogen fixation and cyanobacteria growth as artificial phosphate input. Phosphate input stimulates the growth of Nodularia and Anabaena more than that of Aphanizomenon. We suggest that the upwelled phosphate-rich intermediate water has to be mixed with the surface water containing physiologically “young” cyanobacteria biomass of at least 20 mg/m3 as an inoculum in order to initiate a cyanobacteria bloom.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    Publication Date: 2023-02-08
    Description: Massive cyanobacteria blooms occur almost every summer in the Baltic Sea but the capability to quantitatively predict their extent and intensity is poorly developed. Here we analyse statistical relationships between multi-decadal satellite-derived time series of the frequency of cyanobacteria surface accumulations (FCA) in the central Baltic Sea Proper and a suite of environmental variables. Over the decadal scale (∼5-20 years) FCA was highly correlated (R2 ∼ 0.69) with a set of biogeochemical variables related to the amount of phosphorus and hypoxia in bottom layers. Water temperature in the surface layer was also positively correlated with FCA at the decadal scale. In contrast, the inter-annual variations in FCA had no correlation with the biogeochemical variables. Instead, significant correlations were found with the solar shortwave direct flux in July and the sea-surface temperature, also in July. It thus appears that it is not possible to predict inter-annual fluctuations in cyanobacteria blooms from water chemistry. Moreover, environmental variables could only explain about 45% of the inter-annual variability in FCA, probably because year-to-year variations in FCA are significantly influenced by biological interactions.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...