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  • 2025-2025  (21)
  • 2010-2014  (567,181)
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  • 1
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    Unknown
    PANGAEA
    In:  Supplement to: Büdenbender, Jan; Riebesell, Ulf; Form, Armin (2011): Calcification of the Arctic coralline red algae Lithothamnion glaciale in response to elevated CO2. Marine Ecology Progress Series, 441, 79-87, https://doi.org/10.3354/meps09405
    Publication Date: 2024-05-22
    Description: Rising atmospheric CO2 concentrations could cause a calcium carbonate subsaturation of Arctic surface waters in the next 20 yr, making these waters corrosive for calcareous organisms. It is presently unknown what effects this will have on Arctic calcifying organisms and the ecosystems of which they are integral components. So far, acidification effects on crustose coralline red algae (CCA) have only been studied in tropical and Mediterranean species. In this work, we investigated calcification rates of the CCA Lithothamnion glaciale collected in northwest Svalbard in laboratory experiments under future atmospheric CO2 concentrations. The algae were exposed to simulated Arctic summer and winter light conditions in 2 separate experiments at optimum growth temperatures. We found a significant negative effect of increased CO2 levels on the net calcification rates of L. glaciale in both experiments. Annual mean net dissolution of L. glaciale was estimated to start at an aragonite saturation state between 1.1 and 0.9 which is projected to occur in parts of the Arctic surface ocean between 2030 and 2050 if emissions follow 'business as usual' scenarios (SRES A2; IPCC 2007). The massive skeleton of CCA, which consist of more than 80% calcium carbonate, is considered crucial to withstanding natural stresses such as water movement, overgrowth or grazing. The observed strong negative response of this Arctic CCA to increased CO2 levels suggests severe threats of the projected ocean acidification for an important habitat provider in the Arctic coastal ocean.
    Keywords: Alkalinity, total; Aragonite saturation state; Arctic; Benthos; Bicarbonate ion; BIOACID; Biological Impacts of Ocean Acidification; Boron; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate; Calcification rate, standard deviation; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Date; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Hydroxide ion; Laboratory experiment; Lithothamnion glaciale; Macroalgae; Net calcification rate of calcium carbonate, per individual; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Phosphate; Phosphorus; Plantae; Polar; Potentiometric; Potentiometric titration; Pressure, water; Replicate; Revelle factor; Rhodophyta; Salinity; Season; Silicate; Silicon; Single species; Species; Temperature, water; Treatment; xCO2 (water) at equilibrator temperature (dry air)
    Type: Dataset
    Format: text/tab-separated-values, 8948 data points
    Location Call Number Expected Availability
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  • 2
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    Unknown
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2024-05-22
    Keywords: ANT-XII/3; AWI_PhyOce; Bottle number; Calculated; CTD, ICTD; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; Nitrate; Nitrite; Oxygen; Phosphate; Physical Oceanography @ AWI; Polarstern; Pressure, water; PS34; PS34/112-1; PS34/113-1; PS34/114-1; PS34/115-1; PS34/118-1; PS34/120-1; PS34/122-1; PS34/124-1; PS34/128-1; PS34/131-1; PS34/132-1; PS34/134-1; PS34/136-1; PS34/137-1; PS34/138-1; PS34/139-1; PS34/140-1; PS34/141-1; PS34/142-1; PS34/143-1; PS34/145-1; PS34/147-1; PS34/148-1; PS34/151-1; PS34/152-1; PS34/153-1; PS34/156-1; PS34/158-1; PS34/159-1; PS34/160-1; PS34/161-1; PS34/162-1; PS34/163-1; PS34/164-1; PS34/165-1; PS34/166-1; PS34/167-1; PS34/169-1; PS34/170-1; PS34/171-1; PS34/172-1; PS34/174-1; PS34/175-1; PS34/176-1; PS34/177-1; PS34/178-1; PS34/184-1; PS34/185-1; PS34/187-1; PS34/189-1; PS34/192-1; PS34/193-1; PS34/196-1; PS34/197-1; PS34/198-1; PS34/199-1; PS34/200-1; PS34/201-1; PS34/202-1; PS34/203-1; Salinity; Silicate; Temperature, water; Temperature, water, potential
    Type: Dataset
    Format: text/tab-separated-values, 10939 data points
    Location Call Number Expected Availability
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  • 3
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    Unknown
    PANGAEA
    In:  Supplement to: Krug, Sebastian; Schulz, Kai Georg; Riebesell, Ulf (2011): Effects of changes in carbonate chemistry speciation on Coccolithus braarudii: a discussion of coccolithophorid sensitivities. Biogeosciences, 8(3), 771-777, https://doi.org/10.5194/bg-8-771-2011
    Publication Date: 2024-05-22
    Description: Ocean acidification and associated shifts in carbonate chemistry speciation induced by increasing levels of atmospheric carbon dioxide (CO2) have the potential to impact marine biota in various ways. The process of biogenic calcification, for instance, is usually shown to be negatively affected. In coccolithophores, an important group of pelagic calcifiers, changes in cellular calcification rates in response to changing ocean carbonate chemistry appear to differ among species. By applying a wider CO2 range we show that a species previously reported insensitive to seawater acidification, Coccolithusbraarudii, responds both in terms of calcification and photosynthesis, although at higher levels of CO2. Thus, observed differences between species seem to be related to individual sensitivities while the underlying mechanisms could be the same. On this basis we develop a conceptual model of coccolithophorid calcification and photosynthesis in response to CO2-induced changes in seawater carbonate chemistry speciation.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; BIOACID; Biological Impacts of Ocean Acidification; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcite saturation state; Calculated, see reference(s); Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Coccolithus braarudii; Coccolithus braarudii, size; Coccolithus braarudii, size, standard deviation; Coulter counter; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Haptophyta; Identification; Laboratory experiment; Laboratory strains; Light:Dark cycle; Measured; Nitrate; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon/particulate organic carbon ratio; Particulate inorganic carbon production per cell; Particulate organic carbon production per cell; Pelagos; pH; Phosphate; Photometrically using autoanalyzer QUAATRO; Phytoplankton; Primary production/Photosynthesis; Radiation, photosynthetically active; Salinity; Single species; South Atlantic; Temperature, water; Thermal conductivity meter; Titration potentiometric, 794 Basic Titrino (Metrohm)
    Type: Dataset
    Format: text/tab-separated-values, 930 data points
    Location Call Number Expected Availability
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  • 4
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    Unknown
    PANGAEA
    In:  Supplement to: Holcomb, Michael; Cohen, Anne L; McCorkle, Daniel C (2012): An investigation of the calcification response of the scleractinian coral Astrangia poculata to elevated pCO2 and the effects of nutrients, zooxanthellae and gender. Biogeosciences, 9(1), 29-39, https://doi.org/10.5194/bg-9-29-2012
    Publication Date: 2024-05-22
    Description: The effects of nutrients and pCO2 on zooxanthellate and azooxanthellate colonies of the temperate scleractinian coral Astrangia poculata (Ellis and Solander, 1786) were investigated at two different temperatures (16 °C and 24 °C). Corals exposed to elevated pCO2 tended to have lower relative calcification rates, as estimated from changes in buoyant weights. Experimental nutrient enrichments had no significant effect nor did there appear to be any interaction between pCO2 and nutrients. Elevated pCO2 appeared to have a similar effect on coral calcification whether zooxanthellae were present or absent at 16 °C. However, at 24 °C, the interpretation of the results is complicated by a significant interaction between gender and pCO2 for spawning corals. At 16 °C, gamete release was not observed, and no gender differences in calcification rates were observed - female and male corals showed similar reductions in calcification rates in response to elevated CO2 (15% and 19% respectively). Corals grown at 24 °C spawned repeatedly and male and female corals exhibited two different growth rate patterns - female corals grown at 24 °C and exposed to CO2 had calcification rates 39% lower than females grown at ambient CO2, while males showed a non-significant decline of 5% under elevated CO2. The increased sensitivity of females to elevated pCO2 may reflect a greater investment of energy in reproduction (egg production) relative to males (sperm production). These results suggest that both gender and spawning are important factors in determining the sensitivity of corals to ocean acidification, and considering these factors in future research may be critical to predicting how the population structures of marine calcifiers will change in response to ocean acidification.
    Keywords: Alkalinity, total; Ammonium; Animalia; Aragonite saturation state; Astrangia poculata; Astrangia poculata, weight; Astrangia poculata, zooxanthellate; Benthic animals; Benthos; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate; Calcite saturation state; Calculated; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cnidaria; Coast and continental shelf; DATE/TIME; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gender; Hach conductivity probe; Identification; Laboratory experiment; Lachat QuickChem 8000 flow injection autoanalyzer; Macro-nutrients; Measured; Mercury thermometer; Metrohm Titrando titrator; Nitrate; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Phosphate; Reproduction; Salinity; Silicate; Single species; Spectrophotometer, Ocean Optics USB4000; Temperate; Temperature; Temperature, water; Time, incubation
    Type: Dataset
    Format: text/tab-separated-values, 17072 data points
    Location Call Number Expected Availability
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  • 5
    Publication Date: 2024-05-22
    Keywords: Carbon, inorganic, dissolved; Coulometric titration; Cruise/expedition; DATE/TIME; Depth, bottom/max; DEPTH, water; EPOCA; European Project on Ocean Acidification; Gas chromatography; Identification; LATITUDE; LONGITUDE; Name; Nitrate; Oxygen; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Phosphate; Pressure, water; Salinity; Silicate; Station label; Temperature, water; Temperature at equilibration; Wind direction; Wind speed
    Type: Dataset
    Format: text/tab-separated-values, 25766 data points
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  • 6
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    Unknown
    PANGAEA
    In:  Supplement to: Abouchami, Wafa; Galer, Stephen J G; de Baar, Hein J W; Alderkamp, Anne-Carlijn; Middag, Rob; Laan, Patrick; Feldmann, H; Andreae, Meinrat O (2011): Modulation of the Southern Ocean cadmium isotope signature by ocean circulation and primary productivity. Earth and Planetary Science Letters, 305(1-2), 83-91, https://doi.org/10.1016/j.epsl.2011.02.044
    Publication Date: 2024-05-22
    Description: The High Nutrient Low Chlorophyll (HNLC) Southern Ocean plays a key role in regulating the biological pump and the global carbon cycle. Here we examine the efficacy of stable cadmium (Cd) isotope fractionation for detecting differences in biological productivity between regions. Our results show strong meridional Cd isotope and concentration gradients modulated by the Antarctic Fronts, with a clear biogeochemical divide located near 56°S. The coincidence of the Cd isotope divide with the Southern Boundary of the Antarctic Circumpolar Current (ACC),together with evidence for northward advection of the Cd signal in the ACC, demonstrate that Cd isotopes trace surface ocean circulation regimes. The relationships between Cd isotope ratios and concentrations display two negative correlations, separating the ACC and Weddell Gyre into two distinct Cd isoscapes. These arrays are consistent with Rayleigh fractionation and imply a doubling of the isotope effect due to biological consumption of Cd during water transport from the Weddell Gyre into the ACC. The increase in magnitude of Cd isotope fractionation can be accounted for by differences in the phytoplankton biomass, community composition, and their physiological uptake mechanisms in the Weddell Gyre and ACC, thus linking Cd isotope fractionation to primary production and the global carbon cycle.
    Keywords: ANT-XXIV/3; Area/locality; Cadmium; Cadmium-110/Cadmium-112, error; Cadmium-110/Cadmium-112 ratio; CTD/Rosette; CTD/Rosette, ultra clean; CTD-RO; CTD-UC; Depth, bottom/max; Depth, top/min; DEPTH, water; Elevation of event; Event label; IFISH; International Polar Year (2007-2008); IPY; Iron fish; Latitude of event; Longitude of event; Method comment; Nitrate; Nitrite; Nitrogen oxide; Phosphate; Polarstern; PS71; PS71/101-2; PS71/103-1; PS71/104-2; PS71/105-1; PS71/107-2; PS71/109-1; PS71/111-1; PS71/113-1; PS71/114-1; PS71/117-1; PS71/120-1; PS71/123-1; PS71/126-1; PS71/129-1; PS71/133-1; PS71/136-1; PS71/138-1; PS71/139-1; PS71/163-1; Ratio; Salinity; Silicon; South Atlantic Ocean; Standard deviation; Temperature, water; Thermal Ionization Mass Spectrometry (TIMS); Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 412 data points
    Location Call Number Expected Availability
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  • 7
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Croot, Peter L; Baars, Oliver; Streu, Peter (2011): The distribution of dissolved zinc in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2707-2719, https://doi.org/10.1016/j.dsr2.2010.10.041
    Publication Date: 2024-05-22
    Description: The distribution of dissolved zinc (Zn) was investigated in the Atlantic sector of the Southern Ocean in the austral autumn of 2008 as part of the IPY GEOTRACES expedition ZERO & DRAKE. Research focused on transects across the major frontal systems along the Zero Meridian and across the Drake Passage. There was a strong gradient in surface zinc concentrations observed across the Antarctic Polar Front along both transects and high zinc levels were found in surface waters throughout the Southern Ocean. Vertical profiles for dissolved Zinc showed the presence of local minima and maxima in the upper 200 m consistent with significant uptake by phytoplankton and release by zooplankton grazing, respectively. Highest deep water zinc concentrations were found in the centre of the Weddell Gyre associated with Central Intermediate Water (CIW), a water mass which is depleted in O2, elevated in CO2 and is regionally a CFC minimum. Our data suggests that the remineralization of sinking particles is a key control on the distribution of Zn in the Southern Ocean. Disappearance ratios of zinc to phosphate (Zn:P) in the upper water column increased southwards along both transects and based on laboratory studies they suggest slower growth rates of phytoplankton due to iron or light limitation. Zinc and silicate were strongly correlated throughout the study region but the disappearance ratio (Zn:Si) was relatively uniform overall except for the region close to the ice edge on the Zero Meridian.
    Keywords: ANT-XXIV/3; Bottle number; CTD/Rosette, ultra clean; CTD-UC; Date/Time of event; DEPTH, water; Drake Passage; Element analyser AAS, graphite furnace, Perkin-Elmer 4100 ZL; Elevation of event; Event label; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Latitude of event; Longitude of event; Nitrate and Nitrite; Nitrite; Phosphate; Polarstern; Pressure, water; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS71; PS71/103-1; PS71/104-2; PS71/107-3; PS71/113-3; PS71/119-1; PS71/128-1; PS71/131-5; PS71/141-1; PS71/150-2; PS71/167-1; PS71/230-6; PS71/236-3; PS71/241-6; PS71/249-3; Salinity; Scotia Sea, southwest Atlantic; Silicate; South Atlantic Ocean; SPP1158; Temperature, water; Weddell Sea; Zinc, dissolved
    Type: Dataset
    Format: text/tab-separated-values, 1184 data points
    Location Call Number Expected Availability
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  • 8
    Publication Date: 2024-05-22
    Keywords: ANT-XXIV/3; Carbon dioxide; Carbon dioxide (water) partial pressure; CTD/Rosette; CTD/Rosette, ultra clean; CTD-RO; CTD-UC; DATE/TIME; DEPTH, water; Drake Passage; Event label; Latitude of event; Longitude of event; Nitrate; Phosphate; Polarstern; PS71; PS71/104-3; PS71/113-1; PS71/121-1; PS71/125-1; PS71/141-2; PS71/150-1; PS71/157-1; PS71/161-6; PS71/167-2; PS71/178-1; PS71/186-1; PS71/191-2; PS71/193-1; PS71/198-1; PS71/204-1; PS71/210-2; PS71/216-1; PS71/230-2; PS71/236-1; PS71/241-1; PS71/244-6; PS71/250-3; Scotia Sea, southwest Atlantic; Silicate; South Atlantic Ocean; Station label; Temperature, water; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 140 data points
    Location Call Number Expected Availability
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  • 9
    Publication Date: 2024-05-22
    Keywords: ANT-XX/2; AWI_MarGeoChem; Calculated; Carbon, organic, particulate; Carbon dioxide; Chlorophyll a; Coulometry; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Fluorescence; Fluorometer, Seapoint; Indian Ocean; Latitude of event; Lazarev Sea; Longitude of event; Marine Geochemistry @ AWI; Nitrate; Nitrate and Nitrite; Nitrite; Non-destructive beta-counting (Rutgers van der Loeff & Moore, 1999); Oxygen; Oxygen, Winkler (Culberson, 1991, WOCE Report 68/91); Polarstern; PS63/021-1; PS63/022-2; PS63/023-1; PS63/024-1; PS63/025-1; PS63/026-2; PS63/027-1; PS63/028-1; PS63/029-1; PS63/030-5; PS63/031-1; PS63/032-1; PS63/033-4; PS63/034-1; PS63/035-1; PS63/036-2; PS63/037-3; PS63/038-3; PS63/039-1; PS63/040-1; PS63/041-3; PS63/042-3; PS63/043-1; PS63/044-1; PS63/046-1; PS63/047-1; PS63/048-1; PS63/049-1; PS63/050-1; PS63/052-1; PS63/053-1; PS63/054-4; PS63/055-3; PS63/056-1; PS63/057-1; PS63/058-1; PS63/059-1; PS63/060-1; PS63/061-4; PS63/062-4; PS63/063-1; PS63/064-2; PS63/065-1; PS63/070-1; PS63/071-1; PS63/072-1; PS63/073-1; PS63/075-1; PS63/076-3; PS63/077-1; PS63/078-1; PS63/079-3; PS63/080-1; PS63/081-2; PS63/082-1; PS63/083-1; PS63/085-1; PS63/086-1; PS63/087-1; PS63/088-1; PS63/089-1; PS63/090-1; PS63/091-1; PS63/092-1; PS63/093-1; PS63/094-1; PS63/095-1; PS63/100-1; PS63/101-1; PS63/104-1; PS63/107-2; PS63/116-1; PS63/119-1; PS63/120-2; PS63/121-2; PS63/122-1; PS63/123-2; PS63/124-1; PS63/125-1; PS63/126-1; PS63/127-1; PS63/128-1; PS63/130-1; PS63/131-1; PS63/133-1; PS63/134-1; PS63/135-1; PS63/137-1; PS63/138-1; PS63/140-1; PS63/141-1; PS63/142-1; PS63/143-1; PS63/144-1; PS63/145-1; PS63/147-1; PS63/148-1; PS63/149-1; PS63/150-1; PS63/152-1; PS63 06AQ200211_2; Riiser-Larsen Sea; Salinity; SBE19 self recording CTD; Seawater analysis after Grasshoff et al., 1983 (Verlag Chemie GmbH Weinheim); Silicate; South Atlantic Ocean; Temperature, water; Thorium-234, fraction of dissolved; Thorium-234, fraction of particulate; Thorium-234, total; Thorium-234/Uranium-238 activity ratio; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 21196 data points
    Location Call Number Expected Availability
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  • 10
    facet.materialart.
    Unknown
    PANGAEA
    In:  National Meteorological Office of Algeria
    Publication Date: 2024-05-21
    Keywords: Algeria; Baseline Surface Radiation Network; BSRN; DATE/TIME; Diffuse radiation; Diffuse radiation, standard deviation; Direct radiation; Direct radiation, standard deviation; HEIGHT above ground; Long-wave downward radiation; Long-wave downward radiation, standard deviation; Monitoring station; MONS; Pyranometer, Eppley, PSP, SN 30123 F3, WRMC No. 42001; Pyranometer, Eppley, PSP, SN 32608 F3, WRMC No. 42003; Pyrgeometer, Eppley, PIR, SN 32597 F3, WRMC No. 42006; Pyrheliometer, Eppley, NIP, SN 29948 E6, WRMC No. 42002; Short-wave downward (GLOBAL) radiation; Short-wave downward (GLOBAL) radiation, standard deviation; TAM; Tamanrasset
    Type: Dataset
    Format: text/tab-separated-values, 344876 data points
    Location Call Number Expected Availability
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