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  • 2020-2024  (16)
  • 2020-2022
  • 2000-2004
  • 1980-1984
  • 1970-1974
  • 1930-1934
  • 2024  (16)
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  • 2020-2024  (16)
  • 2020-2022
  • 2000-2004
  • 1980-1984
  • 1970-1974
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  • 1
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    Seasonal energy reserves of the cold-water coral Desmophyllum dianthus from Comau Fjord, Chile (2024)
    PANGAEA
    Details
    Publication Date: 2024-03-07
    Description: Between September 2016 and August 2017, we conducted year-long reciprocal transplantation experiments using the cold-water coral Desmophyllum dianthus along natural oceanographic horizontal and vertical gradients (vertically: 20 m to 300 m depth and horizontally: head to mouth of fjord) in Comau Fjord to study seasonal changes and the acclimatisation potential of its biochemical composition. Seasonal energy reserves (proteins, carbohydrates and lipids) and the C:N ratio of native and novel (cross-transplanted) corals were measured at six shallow (A-F, 20 m) and one deep station (Ed, 300 m) during autral summer (January), autumn (May) and winter (August).
    Keywords: A, As; B; C; C:N; Carbohydrate; Carbohydrates, energy reserve per individuum; Carbohydrates, energy reserve per surface area; Carbohydrates per individuum; Carbohydrates per surface area; Carbon/Nitrogen ratio; Caryophyllia huinayensis, area; Comau Fjord, Patagonia, Chile; D; Depth, description; Ed; energy reserves; Es; Event label; F, Fs, Lillihuapy, Lilliguapi; Identification; Liliguapi; Lipid; Lipids, energy reserve per individuum; Lipids, energy reserve per surface area; Lipids per individuum; Lipids per surface area; Method comment; Monitoring station; MONS; Near_SWALL; PACOC; Pared_de_la_cruz; Pirate_Cove; Plankton- And cold-water COral ecology in Comau Fjord, Chile; protein; Proteins, energy reserve per individuum; Proteins, energy reserve per surface area; Proteins per individuum; Proteins per surface area; Reciprocal Transplant; Rio_Tambor; Season; seasonality; Species, unique identification; Species, unique identification (URI); Station label; surface area; Total energy reserve per individuum; Total energy reserve per surface area; X-Telele; X-Telele_deep
    Type: Dataset
    Format: text/tab-separated-values, 5081 data points
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    DATA PANGAEA
  • 2
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    Continuous thermosalinograph oceanography along RV ALKOR cruise track AL596 (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-03
    Description: Underway temperature and salinity data was collected along the cruise track with a thermosalinograph (TSG) together with a SBE38 Thermometer. Both systems worked throughout the cruise. While temperature is taken at the water inlet in about 4 m depth, salinity is estimated within the interior TSG from conductivity and interior temperature. No temperature and salinity calibration was performed. For details to all processing steps see Data Processing Report.
    Keywords: AL596; AL596_0_Underway-1; Alkor (1990); Calculated from internal temperature and conductivity; Conductivity; DAM_Underway; DAM Underway Research Data; DATE/TIME; DEPTH, water; Digital oceanographic thermometer, Sea-Bird, SBE 38; LATITUDE; LONGITUDE; Quality flag, salinity; Quality flag, water temperature; Salinity; Seadatanet flag: Data quality control procedures according to SeaDataNet (2010); Temperature, water; Temperature, water, internal; Thermosalinograph; Thermosalinograph (TSG), Sea-Bird, SBE 21 SEACAT; TSG
    Type: Dataset
    Format: text/tab-separated-values, 39383 data points
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    DATA PANGAEA
  • 3
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    Water parameters from a long-term multiple stressor aquarium experiment with the cold-water coral Desmophyllum pertusum (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-09
    Description: We conducted a long-term (6 months) multiple stressor aquarium experiment with the cold-water coral Desmophyllum pertusum (syn. Lophelia pertusa) under future environmental conditions. The experiment with live corals consisted of four different treatments to investigate the combined effect of ocean acidification, warming, deoxygenation and food limitation on their physiology: 1) control (9 °C, pH 8.1, 100 % oxygen, 100 % food availability), 2) multiple stressor with high feeding (12 °C, pH 7.7, 90 % oxygen, 100 % food availability), 3) multiple stressor with low feeding (12 °C, pH 7.7, 90 % oxygen, 50 % food availability) and 4) reduced oxygen (9 °C, pH 8.1, 90 % oxygen, 100 % food availability). Every treatment consisted of three replicate tanks with four live corals (treatments 1-4). In a parallel experiment, we also examined the dissolution rates of dead coral skeletons at three different pCO2 levels (treatment 5: 750, treatment 6: 1000 and treatment 7: 1250 ppm) after 1.5, 3, 4.5 and 6 months. Every treatment consisted of three replicate tanks with two dead coral skeletons (treatments 1, 2 and 5-7). Water parameters (temperature, salinity, pH and oxygen concentration) were measured five times per week in every coral tank.
    Keywords: Calculated; Climate change; cold-water coral; DATE/TIME; Desmophyllum_pertusum_Sampling_Area_and_Period; experiment; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Multiparameter probe, YSI ProDIGITAL, Xylem; Multiple stressors; Oxygen, dissolved; Oxygen saturation; pH; pH meter (Orion Versa Star Pro, Thermo Fisher Scientific); Remote operated vehicle; ROV; Salinity; Tank number; Temperature, water; Tisler Reef, Skagerrak; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 19211 data points
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    DATA PANGAEA
  • 4
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    Physiological parameters from a long-term multiple stressor aquarium experiment with the cold-water coral Desmophyllum pertusum (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-09
    Description: We conducted a long-term (6 months) multiple stressor aquarium experiment with the cold-water coral Desmophyllum pertusum (syn. Lophelia pertusa) under future environmental conditions. The experiment with live corals consisted of four different treatments to investigate the combined effect of ocean acidification, warming, deoxygenation and food limitation on their physiology: 1) control (9 °C, pH 8.1, 100 % oxygen, 100 % food availability), 2) multiple stressor with high feeding (12 °C, pH 7.7, 90 % oxygen, 100 % food availability), 3) multiple stressor with low feeding (12 °C, pH 7.7, 90 % oxygen, 50 % food availability) and 4) reduced oxygen (9 °C, pH 8.1, 90 % oxygen, 100 % food availability). Every treatment consisted of three replicate tanks with four live corals (treatments 1-4). The physiological parameters were determined after 1.5, 3, 4.5 and 6 months of the experiment. Growth rates were measured using the buoyant weighing technique (Jokiel et al. 1978) and respiration rates were conducted using closed-cell incubations.
    Keywords: Buoyant weighing technique according to Jokiel et al. (1978); Calculated; cold-water coral; Desmophyllum_pertusum_Sampling_Area_and_Period; Desmophyllum pertusum, dry mass; Desmophyllum pertusum, growth rate; Desmophyllum pertusum, respiration rate, oxygen, per polyp; Duration; experiment; Fibre optic oxygen and temperature probes (OXY-4 SMA, POF, PSt3, Pt100, PreSens); growth rates; Health status; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Multiple-stressor; Remote operated vehicle; Respiration; ROV; Specimen identification; Tank number; Tisler Reef, Skagerrak; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 2051 data points
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    DATA PANGAEA
  • 5
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    Dissolution rates from a long-term multiple stressor aquarium experiment with the cold-water coral Desmophyllum pertusum (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-09
    Description: We conducted a long-term (6 months) multiple stressor aquarium experiment with the cold-water coral Desmophyllum pertusum (syn. Lophelia pertusa) under future environmental conditions. The experiment with dead coral skeletons consisted of five different treatments to investigate the combined effect of ocean acidification, warming and deoxygenation on their skeletal dissolution: control (9 °C, pH 8.1, 100 % oxygen), multiple stressor (12 °C, pH 7.7, 90 % oxygen) and three different pCO2 levels (750, 1000 and 1250 ppm). The coral skeletons were weighed after 1.5, 3, 4.5 and 6 months using the buoyant weighing technique. Every treatment consisted of three replicate tanks with two dead coral skeletons.
    Keywords: Aragonite saturation; Buoyant weighing technique according to Jokiel et al. (1978); Calculated; Climate change; cold-water coral; Desmophyllum_pertusum_Sampling_Area_and_Period; Desmophyllum pertusum, dry mass; Desmophyllum pertusum, skeletal dissolution rate; Duration; experiment; Health status; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; pH; Remote operated vehicle; ROV; skeletal dissolution; Specimen identification; Tank number; Tisler Reef, Skagerrak; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 838 data points
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    DATA PANGAEA
  • 6
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    Mortality rates from a long-term multiple stressor aquarium experiment with the cold-water coral Desmophyllum pertusum (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-09
    Description: We conducted a long-term (6 months) multiple stressor aquarium experiment with the cold-water coral Desmophyllum pertusum (syn. Lophelia pertusa) under future environmental conditions. The experiment with live corals consisted of four different treatments to investigate the combined effect of ocean acidification, warming, deoxygenation and food limitation on their physiology: 1) control (9 °C, pH 8.1, 100 % oxygen, 100 % food availability), 2) multiple stressor with high feeding (12 °C, pH 7.7, 90 % oxygen, 100 % food availability), 3) multiple stressor with low feeding (12 °C, pH 7.7, 90 % oxygen, 50 % food availability) and 4) reduced oxygen (9 °C, pH 8.1, 90 % oxygen, 100 % food availability). Every treatment consisted of three replicate tanks with four live corals (treatments 1-4). Mortality rates and numbers of dead vs. live coral polyps were assessed over the full course of the experiment.
    Keywords: Climate change; cold-water coral; Desmophyllum_pertusum_Sampling_Area_and_Period; Desmophyllum pertusum, dead polyps; Desmophyllum pertusum, live polyps; Desmophyllum pertusum, mortality; Duration; experiment; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; mortality; Multiple stressors; Remote operated vehicle; ROV; Specimen identification; Tank number; Tisler Reef, Skagerrak; Treatment; Visual observation
    Type: Dataset
    Format: text/tab-separated-values, 1872 data points
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    DATA PANGAEA
  • 7
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    Continuous thermosalinograph oceanography along RV ALKOR cruise track AL586 (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-03
    Description: Underway temperature and salinity data was collected along the cruise track with a thermosalinograph (TSG) together with a SBE38 Thermometer. Both systems worked throughout the cruise. While temperature is taken at the water inlet in about 4 m depth, salinity is estimated within the interior TSG from conductivity and interior temperature. No temperature and salinity calibration was performed. For details to all processing steps see Data Processing Report.
    Keywords: AL586; AL586_0_Underway-1; Alkor (1990); Calculated from internal temperature and conductivity; Conductivity; DAM_Underway; DAM Underway Research Data; DATE/TIME; DEPTH, water; Digital oceanographic thermometer, Sea-Bird, SBE 38; LATITUDE; LONGITUDE; Quality flag, salinity; Quality flag, water temperature; Salinity; Seadatanet flag: Data quality control procedures according to SeaDataNet (2010); Temperature, water; Temperature, water, internal; Thermosalinograph; Thermosalinograph (TSG), Sea-Bird, SBE 21 SEACAT; TSG
    Type: Dataset
    Format: text/tab-separated-values, 42972 data points
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  • 8
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    Characteristics and sources of fluorescent aerosols in the central Arctic Ocean (2024)
    University of California Press
    In:  EPIC3Elem Sci Anth, University of California Press, 12(1), ISSN: 2325-1026
    Details
    Publication Date: 2024-06-04
    Description: 〈jats:p〉The Arctic is sensitive to cloud radiative forcing. Due to the limited number of aerosols present throughout much of the year, cloud formation is susceptible to the presence of cloud condensation nuclei and ice nucleating particles (INPs). Primary biological aerosol particles (PBAP) contribute to INPs and can impact cloud phase, lifetime, and radiative properties. We present yearlong observations of hyperfluorescent aerosols (HFA), tracers for PBAP, conducted with a Wideband Integrated Bioaerosol Sensor, New Electronics Option during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition (October 2019–September 2020) in the central Arctic. We investigate the influence of potential anthropogenic and natural sources on the characteristics of the HFA and relate our measurements to INP observations during MOSAiC. Anthropogenic sources influenced HFA during the Arctic haze period. But surprisingly, we also found sporadic “bursts” of HFA with the characteristics of PBAP during this time, albeit with unclear origin. The characteristics of HFA between May and August 2020 and in October 2019 indicate a strong contribution of PBAP to HFA. Notably from May to August, PBAP coincided with the presence of INPs nucleating at elevated temperatures, that is, >−9°C, suggesting that HFA contributed to the “warm INP” concentration. The air mass residence time and area between May and August and in October were dominated by the open ocean and sea ice, pointing toward PBAP sources from within the Arctic Ocean. As the central Arctic changes drastically due to climate warming with expected implications on aerosol–cloud interactions, we recommend targeted observations of PBAP that reveal their nature (e.g., bacteria, diatoms, fungal spores) in the atmosphere and in relevant surface sources, such as the sea ice, snow on sea ice, melt ponds, leads, and open water, to gain further insights into the relevant source processes and how they might change in the future.〈/jats:p〉
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 9
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    Spatial migration of temporal earthquake clusters driven by the transfer of differential stress between neighbouring fault/shear-zone structures (2024)
    Elsevier
    Details
    Publication Date: 2024-05-03
    Description: Uncertainty concerning the processes responsible for slip-rate fluctuations associated with temporal clustering of surface faulting earthquakes is a fundamental, unresolved issue in tectonics, because strain-rates accommodated by fault/shear-zone structures are the key to understanding the viscosity structure of the crust and seismic hazard. We constrain the timing and amplitude of slip-rate fluctuations that occurred on three active normal faults in central Italy over a time period of 20–30 kyrs, using in situ 36Cl cosmogenic dating of fault planes. We identify five periods of rapid slip on individual faults lasting a few millennia, separated time periods of up to 10 millennia with low or zero slip-rate. The rapid slip pulses migrated across the strike between the faults in two waves from SW to NE. We replicate this migration with a model where rapid slip induces changes in differential stress that drive changes in strain-rate on viscous shear zones that drive slip-rate variability on overlying brittle faults. Earthquakes increase the differential stress and strain-rate on underlying shear zones, which in turn accumulate strain, re-loading stress onto the overlying brittle fault. This positive feedback produces high strain-rate episodes containing several large magnitude surface faulting earthquakes (earthquake clusters), but also reduce the differential stress on the viscous portions of neighbouring fault/shear-zones slowing the occurrence of large-magnitude surface faulting earthquakes (earthquake anticlusters). Shear-zones on faults experiencing anticlusters continue to accumulate viscous strain at a lowered rate, and eventually this loads the overlying brittle fault to failure, initiating a period of rapid slip through the positive feedback process described above, and inducing lowered strain-rates onto neighbouring fault/shear-zones. We show that these patterns of differential stress change can replicate the measured earthquake clustering implied by the 36Cl data. The stress changes are related to the fault geometry in terms of distance and azimuth from the slipping structure, implying that (a) strain-rate and viscosity fluctuations for studies of continental rheology, and (b) slip-rates for seismic hazard purposes are to an extent predictable given knowledge of the fault system geometry.
    Description: Published
    Description: 105096
    Description: OST2 Deformazione e Hazard sismico e da maremoto
    Description: JCR Journal
    Keywords: Active Faults ; Central Apennines ; Fault interaction
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 10
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    On the cost competitiveness of blue and green hydrogen (2024)
    In:  Joule
    Details
    Publication Date: 2024-01-26
    Description: Despite the cost reductions of green hydrogen, it is uncertain when cost parity with blue hydrogen will be achieved. Beyond technology costs, electricity and natural gas prices, hydrogen’s competitiveness will be increasingly determined by carbon costs or regulation associated with its life-cycle emissions. Theoretically and numerically, we demonstrate that higher residual emissions of blue hydrogen can close its competitive window much earlier than the cost parity of green hydrogen suggests. In regions where natural gas prices remain substantially higher (∼40 EUR/MWh) than before the energy crisis, such a window is narrow or has already closed. While blue hydrogen could potentially bridge the scarcity of green hydrogen, uncertainties about the beginning and end of blue hydrogen competitiveness may hinder investments. In contrast, in regions where natural gas prices drop to ≤15 EUR/MWh, blue hydrogen can remain competitive until at least 2040, contingent upon achieving rigorous CO2 capture (〉90%) and negligible methane leakage rates (〈1%).
    Language: English
    Type: info:eu-repo/semantics/article
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