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  • PANGAEA  (2)
  • Copernicus Publications on behalf of the European Geosciences Union  (1)
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  • 1
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    Fluorescence properties of dissolved organic matter from Leverett Glacier outflow (2020)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: The outflow of Leverett Glacier, a large land-terminating glacier of the Greenland Ice Sheet was sampled over the 2015 ablation season. Dissolved organic carbon (DOC) concentrations, dissolved organic matter (DOM) fluorescence, and hydrogeochemical data (e.g. discharge, specific conductivity, pH, and turbidity) were analyzed to assess changing DOM sources over the melt season. DOC concentrations and red-shifted fluorescence suggest terrestrial inputs from overridden soils dominated DOM early season inputs before progressive dilution with increasing discharge. During the outburst period, supraglacial drainage events disrupted the subglacial drainage system and introduced dominant protein-like fluorescence signatures not observed in basal flow. These results suggest that subglacial hydrology and changing water sources influence exported DOC concentration and DOM composition, differentiated through fluorescence characteristics. The outburst and post-outburst periods were characterized by protein-like fluorescence from supraglacial and potentially subglacial microbial sources.
    Keywords: Campbell Scientific 247-L Conductivity and Temperature Probe; Carbon, organic, dissolved; Carbon, organic, dissolved load; Conductivity; DATE/TIME; Day of the year; Dissolved Organic Matter; DOM; Event label; Flow rate; Fluorescence; Fluorescence, dissolved organic matter, at 317 nm wavelength; Fluorescence, dissolved organic matter, at 368 nm wavelength; Fluorescence, dissolved organic matter, at 416 nm wavelength; Fluorescence, dissolved organic matter, at 425 nm wavelength; Fluorescence, dissolved organic matter, at 483 nm wavelength; Fluorescence spectrometer, AquaLog, HORIBA JobinYvon; glaciers; Greenland; Honeywell Durafet pH sensors; Lachat QuickChem 8500 flow injection autoanalyser; L Atalante; Leverett_glacier_basal_ice; Leverett_glacier_snow; Leverett_glacier_time_series; Nitrogen in nitrate; PARAFAC; Period; pH; Phosphorus in orthophosphate; Pressure transducer, HOBO; Roorkee Industries Suspended Sediment Sampler USDH-48; Shimadzu TOC-L total organic carbon analyzer; SNOW; Snow/ice sample; Suspended particulate matter; Thermo Scientific Dionex IonPac AS11-HC-4μm Anion-Exchange Column fitted to a Thermo Scientific Dionex ICS-5000 Ion Chromatography; ZAIROV
    Type: Dataset
    Format: text/tab-separated-values, 785 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Seawater carbonate chemistry and growth and photophysiology of two tropical reef macroalgae (2024)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Focusing on algal taxa from two different functional groups on Caribbean coral reefs, we exposed fleshy (Dictyota spp.) and calcifying (Halimeda tuna) macroalgae to ambient and low seawater pH for 25 days in an outdoor experimental system in the Florida Keys. We quantified algal growth, calcification, photophysiology, and DOC production across pH treatments.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Buoyant mass; Calcification/Dissolution; Calcification rate; Calcification rate, standard deviation; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Calculated using seacarb after Orr et al. (2018); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Carotenoids; Carotenoids, standard deviation; Chlorophyll a; Chlorophyll a, standard deviation; Chlorophyll b; Chlorophyll b, standard deviation; Chlorophyta; Chromista; Coast and continental shelf; Dictyota sp.; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Fugacity of carbon dioxide in seawater, standard deviation; Growth/Morphology; Halimeda tuna; Laboratory experiment; Macroalgae; Mass, standard deviation; Maximum quantum yield of photosystem II; Maximum quantum yield of photosystem II, standard deviation; Net calcification rate of calcium carbonate, dark; Net calcification rate of calcium carbonate, light; Net photosynthesis rate, oxygen; Net photosynthesis rate, standard deviation; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Oxygen, dissolved; Oxygen, dissolved, standard deviation; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; pH, standard deviation; Plantae; Primary production/Photosynthesis; Respiration; Respiration rate, oxygen; Respiration rate, oxygen, standard deviation; Salinity; Salinity, standard deviation; Single species; Species; Surface area; Surface area, standard deviation; Temperate; Temperature, water; Temperature, water, standard deviation; Treatment; Type of study; Wet mass; Wet mass, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 240 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Seasonal hydrology drives rapid shifts in the flux and composition of dissolved and particulate organic carbon and major and trace ions in the Fraser River, Canada (2015)
    Copernicus Publications on behalf of the European Geosciences Union
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 12 (2015): 5597-5618, doi:10.5194/bg-12-5597-2015.
    Description: Rapid changes in the volume and sources of discharge during the spring freshet lead to pronounced variations in biogeochemical properties in snowmelt-dominated river basins. We used daily sampling during the onset of the freshet in the Fraser River (southwestern Canada) in 2013 to identify rapid changes in the flux and composition of dissolved material, with a focus on dissolved organic matter (DOM). Previous time series sampling (at twice monthly frequency) of dissolved inorganic species in the Fraser River has revealed smooth seasonal transitions in concentrations of major ions and tracers of water and dissolved load sources between freshet and base flow periods. In contrast, daily sampling reveals a significant increase in dissolved organic carbon (DOC) concentration (200 to 550 μmol L−1) occurring over a matter of days, accompanied by a shift in DOM optical properties, indicating a transition towards higher molecular weight, more aromatic DOM composition. Comparable changes in DOM composition, but not concentration, occur at other times of year, underscoring the role of seasonal climatology in DOM cycling. A smaller data set of total and dissolved Hg concentrations also showed variability during the spring freshet period, although dissolved Hg dynamics appear to be driven by factors beyond DOM as characterized here. The time series records of DOC and particulate organic carbon (POC) concentrations indicate that the Fraser River exports 0.25–0.35 % of its annual basin net primary productivity. The snowmelt-dominated hydrology, forested land cover, and minimal reservoir impoundment of the Fraser River may influence the DOC yield of the basin, which is high relative to the nearby Columbia River and of similar magnitude to that of the Yukon River to the north. Anticipated warming and decreased snowfall due to climate changes in the region may cause an overall decrease in DOM flux from the Fraser River to the coastal ocean in coming decades
    Description: This work was partially supported by a WHOI Ocean Ventures Fund award to BMV and NSF grants EAR-1226818 to BPE, OCE-0851015 to TIE, BPE, and VG, and OCE-0851101 to RGMS, and support to BPE from Jane and James Orr.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/msword
    Format: image/tiff
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
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