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  • 2020-2024  (27)
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  • 1
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    Zooplankton‐derived dissolved organic matter composition and its bioavailability to natural prokaryotic communities (2022)
    De Corte, Daniele ; Varela, Marta M. ; Louro, Angeles M. ; [et al.]
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2023-12-14
    Description: Zooplankton grazing onphytoplankton promotes the release of particulate and dissolved organic matter (DOM) into the water column and therefore plays a key role in organic matter cycling in aquatic systems. Prokaryotes are the main DOM consumers in the ocean by actively remineralizing and transforming it, contributing to its molecular diversification. To explore the molecular composition of zooplankton‐derived DOM and its bioavailability to natural prokaryotic communities, the DOM generated by a mixed zooplankton community in the coastal Atlantic off Spain was used as substrate for a natural prokaryotic community and monitored over a ~ 5‐d incubation experiment. The molecular composition of solid‐phase extracted DOM was characterized via Fourier‐transform ion cyclotron resonance mass spectrometry. After ~ 4 d in the zooplankton‐derived DOM amended incubation, the prokaryotic community demonstrated a 17‐fold exponential increase in cell number. The prokaryotic growth resulted in a reduction in bulk dissolved organic carbon concentration and the zooplankton‐derived DOM was considerably transformed at molecular and bulk elemental levels over the incubation period. The C : N ratio (calculated from the obtained molecular formulae) increased while the functional diversity decreased over the incubation time. In addition, molecular indices pointed to a reduced bioavailability of DOM at the end of the experiment. These findings show that zooplankton excreta are a source of labile organic matter that is quickly metabolized by the prokaryotic community. Therefore, a fraction of carbon is shunted from transfer to secondary consumers similarly to the viral shunt, suggesting that the zooplankton–prokaryotic interactions play an important role in the ocean's carbon cycle.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: Xunta de Galicia http://dx.doi.org/10.13039/501100010801
    Keywords: ddc:577.7 ; Spain ; coastal Atlantic ; zooplankton–prokaryotic interactions ; ocean’s carbon cycle
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Transformation of dissolved organic matter by two Indo‐Pacific sponges (2022)
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2023-01-27
    Description: Dissolved organic matter (DOM) is the largest organic carbon reservoir in the ocean and an integral component of biogeochemical cycles. The role of free‐living microbes in DOM transformation has been studied thoroughly, whereas little attention has been directed towards the influence of benthic organisms. Sponges are efficient filter feeders and common inhabitants of many benthic communities circumglobally. Here, we investigated how two tropical coral reef sponges shape marine DOM. We compared bacterial abundance, inorganic and organic nutrients in off reef, sponge inhalant, and sponge exhalant water of Melophlus sarasinorum and Rhabdastrella globostellata. DOM and bacterial cells were taken up, and dissolved inorganic nitrogen was released by the two Indo‐Pacific sponges. Both sponge species utilized a common set of 142 of a total of 3040 compounds detected in DOM on a molecular formula level via ultrahigh‐resolution mass spectrometry. In addition, species‐specific uptake was observed, likely due to differences in their associated microbial communities. Overall, the sponges removed presumably semi‐labile and semi‐refractory compounds from the water column, thereby competing with pelagic bacteria. Within minutes, sponge holobionts altered the molecular composition of surface water DOM (inhalant) into a composition similar to deep‐sea DOM (exhalent). The apparent radiocarbon age of DOM increased consistently from off reef and inhalant to exhalant by about 900 14C years for M. sarasinorum. In the pelagic, similar transformations require decades to centuries. Our results stress the dependence of DOM lability definition on the respective environment and illustrate that sponges are hotspots of DOM transformation in the ocean.
    Description: Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg
    Description: Ministry for Science and Culture of Lower Saxony http://dx.doi.org/10.13039/501100010570
    Description: Carl‐von‐Ossietzky University Oldenburg
    Description: Alfred‐Wegener‐Institute, Helmholtz‐Center for Polar and Marine Research
    Description: Volkswagen Foundation http://dx.doi.org/10.13039/501100001663
    Description: https://doi.org/10.5061/dryad.m0cfxpp6v
    Keywords: ddc:577.7 ; Indo-Pacific sponges ; dissolved organic matter ; biogeochemical cycles
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 3
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    Water chemistry of unfiltered groundwater samples from the Fennoscandian Shield deep terrestrial biosphere in 2018 and 2019 (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: Copious amounts of organic carbon are stored for long periods of time in deep continental groundwaters. Little is known about its composition and cycling, mainly due to the difficulties in obtaining sample material. Cool fracture waters of different origins can be obtained under clean conditions at Äspö Hard Rock Laboratory (Äspö HRL, Sweden), operated by the Swedish Nuclear Fuel and Waste Management Company (SKB). We sampled groundwater from different depth (171 to 507 meter below sea level) in the bedrock fractures in November 2018 and March-April 2019. We assessed water chemistry and dissolved organic matter composition via stable carbon isotopic and molecular-formula level analysis in recent Baltic Sea-influenced to old saline fracture waters in the granitic Fennoscandian shield. Physicochemical parameters, major ions, water isotopic compositions (δ18O and δD), total nitrogen as well as dissolved organic matter concentration and stable isotopic composition were obtained for unfiltered groundwater samples from different boreholes.
    Keywords: aquifer; BalticSea_Äspö; BalticSea_Kalmar; Calcium; Carbon, organic, dissolved; Carbon, organic, dissolved, standard deviation; Carbon-14, modern, dissolved inorganic carbon; Carbon-14, modern, dissolved organic carbon; Chlorine; Conductivity; DATE/TIME; Elevation of event; Event label; Extraction efficiency; FT-ICR-MS; groundwater; HA2780A_1; Iron; Iron, total; Iron 2+; KA1755A_3; KA2051A01_5; KA2511A_5; KA2862A_1; KA2865A01_1; KA3105A_3; KA3385A_1; KA3510A_2; KA3600F_2; Latitude of event; Longitude of event; Magnesium; Manganese; Nitrogen, total dissolved; Nitrogen, total dissolved, standard deviation; Nitrogen in ammonium; Nitrogen in nitrate; Nitrogen in nitrite; pH; Phosphorus in phosphate; Potassium; SA1229A_1; SA1730A_1; SA2600A_1; Sodium; Sulfide in hydrogen sulfide; Sulfur in sulfate; Sweden; Temperature, water; Type; δ13C, dissolved inorganic carbon; δ13C, dissolved organic carbon; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 1050 data points
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    DATA PANGAEA
  • 4
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    Dissolved organic matter composition in the Fennoscandian Shield deep terrestrial biosphere (FT-ICR-MS), 2018 and 2019 (2021)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Copious amounts of organic carbon are stored for long periods of time in deep continental groundwaters. Little is known about its composition and cycling, mainly due to the difficulties in obtaining sample material. Cool fracture waters of different origins can be obtained under clean conditions at Äspö Hard Rock Laboratory (Äspö HRL, Sweden), operated by the Swedish Nuclear Fuel and Waste Management Company (SKB). We sampled groundwater from different depth (171 to 507 meter below sea level) in the bedrock fractures in November 2018 and March-April 2019. We assessed water chemistry and dissolved organic matter composition via stable carbon isotopic and molecular-formula level analysis in recent Baltic Sea-influenced to old saline fracture waters in the granitic Fennoscandian shield. Molecular-level dissolved organic matter composition via Fourier-transform ion cyclotron resonance mass spectrometry using electrospray ionization in negative mode (FT-ICR-MS, 15 T Bruker Solarix) was done on solid-phase extracted (PPL) DOM extracts. Relative peak intensities from FT-ICR-MS with molecular formula attributions, elemental ratios and compound group classification of the final dataset are given. ICBM-Ocean was used for processing of FT-ICR mass spectra and formula attribution (Merder et al., 2020; doi:10.1021/acs.analchem.9b05659).
    Keywords: aquifer; Aromaticity index, modified; BalticSea_Äspö; BalticSea_Kalmar; Double bond equivalent; Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS, 15 T Bruker Solarix); FT-ICR-MS; groundwater; HA2780A_1; Hydrogen/Carbon ratio; KA1755A_3; KA2051A01_5; KA2511A_5; KA2862A_1; KA2865A01_1; KA3105A_3; KA3385A_1; KA3510A_2; KA3600F_2; Mass of molecular formulas; Molecular formula; Nitrogen/Carbon ratio; Oxygen/Carbon ratio; Peak intensity; Phosphorus/Carbon ratio; Presence/absence; SA1229A_1; SA1730A_1; SA2600A_1; Sulfur/Carbon ratio; Sweden
    Type: Dataset
    Format: text/tab-separated-values, 814592 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Dissolved organic matter molecular composition data and supporting metadata for multiple oceanographic cruises with RV SONNE (SO254, SO245, SO248) and RV POLARSTERN (PS79), Bermuda Atlantic Time-series Study and Hawaii Ocean Time-series (2023)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Description: This data includes the dissolved organic matter (DOM) molecular composition data obtained via Fourier-transform ion cyclotron resonance mass spectrometry and the accompanying metadata (cruise, station number, geographic coordinates, water depth, temperature, salinity and solid-phase extracted dissolved organic carbon concentrations (SPE-DOC)) for multiple oceanographic cruises (HOTS, BATS, SO254, SO245, SO248, ANT 28-II, ANT 28-IV, and 28-V). This data was analyzed in Bercovici et al., 2023 (https://doi.org/10.1029/2023GB007740). DOM composition data for the cruise SO245 was previously published in Osterholz et al., 2021 (https://doi.org/10.1016/j.marchem.2021.103955). In order to maximize comparability among data, we reanalyzed the same set of samples from SO245 on the FT-ICR-MS together with the samples from the other cruises and sites. SPE-DOC concentrations were determined on a Shimadzu TOC-VPCH total organic carbon analyzer. DOM composition was determined on a SolariX XR FT-ICR-MS (Bruker Daltonik GmbH, Bremen, Germany) equipped with a 15 Tesla superconducting magnet and an electrospray ionization source (ESI; Bruker Apollo II ion source). The metadata were compiled from the CTD bottle data of multiple cruises, some of which are available on PANGAEA at the following links: SO248: https://doi.org/10.1594/PANGAEA.864673, SO245: https://doi.org/10.1594/PANGAEA.890394, SO254: https://doi.org/10.1594/PANGAEA.890453.
    Keywords: Dissolved Organic Matter; Fourier-transform ion cyclotron mass spectrometry; Global Ocean; molecular composition
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 6
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    Investigation of Total Alkalinity during an artificially induced phytoplankton spring bloom (2022)
    PANGAEA
    Details
    Publication Date: 2023-12-01
    Description: To investigate links between biological, biogeochemical and physical parameters, we closely monitored an artificially induced spring bloom. Our mesocosm approach mimicked a neritic North Sea water body. Three biological replicates (P2-P4) were inoculated with a phytoplankton and associated bacterial community, which was retrieved in March 2018 from the southern North Sea. The incubation was monitored for 38 days. The experiment additionally covered the investigation of two biota-free controls. A variety of parameters were sampled, the results of some can be found in Mori et al. (2021; doi:10.1016/j.gca.2021.08.002). Total alkalinity was sampled daily. For the analysis we used a multiscan GO microplate spectrophotometer (Thermo Scientific) and followed the method described by Sarazin et al. (1999; doi:10.1016/S0043-1354(98)00168-7).
    Keywords: Alkalinity, total; Day of experiment; mesocosm; North_Sea-Mesocosm; North Sea; PHREEQC; Planktotrons; Rare earth elements; Sample code/label; Spectrophotometer, Thermo Fisher Scientific, Multiskan GO Microplate
    Type: Dataset
    Format: text/tab-separated-values, 351 data points
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    DATA PANGAEA
  • 7
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    Supporting metadata for multiple oceanographic cruises with RV SONNE (SO254, SO245, SO248) and RV POLARSTERN (PS79), Bermuda Atlantic Time-series Study and Hawaii Ocean Time-series (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: The data presented here include the metadata (cruise, station number, geographic coordinates, water depth, temperature, salinity and solid-phase extracted dissolved organic carbon concentrations (SPE-DOC)) for multiple oceanographic cruises in the Atlantic, Pacific and Southern oceans (HOTS, BATS, SO254, SO245, SO248, ANT 28-II, ANT 28-IV, and 28-V) between 2009 and 2017. These metadata were used in conjunction with the accompanying dataset to assess the role of deep ocean mixing in the molecular composition of dissolved organic matter was compiled from the CTD bottle data of multiple cruises, some of which are available on PANGAEA at the following links: SO248: https://doi.org/10.1594/PANGAEA.864673, SO245: https://doi.org/10.1594/PANGAEA.890394, SO254: https://doi.org/10.1594/PANGAEA.890453.
    Keywords: ANT-XXVIII/2; ANT-XXVIII/4; ANT-XXVIII/5; BacGeoPac; BAT_SPE; Bering Sea; Canarias Sea; Carbon, organic, dissolved, extracted; Central Pacific Ocean; Cruise/expedition; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Dissolved Organic Matter; Drake Passage; Equatorial Pacific; Event label; Fourier-transform ion cyclotron mass spectrometry; Global Ocean; HOT_SPE; LATITUDE; Lazarev Sea; Location; LONGITUDE; molecular composition; MUC; MultiCorer; North Atlantic Ocean; North Pacific Ocean; Polarstern; Pori Bac NewZ; PS79; PS79/035-3; PS79/036-1; PS79/037-1; PS79/038-2; PS79/039-3; PS79/040-2; PS79/041-3; PS79/042-2; PS79/043-2; PS79/044-1; PS79/045-1; PS79/046-3; PS79/048-1; PS79/049-2; PS79/052-2; PS79/053-3; PS79/054-3; PS79/178-1; PS79/179-1; PS79/193-2; PS79/205-1; PS79/217-1; PS79/232-1; PS79/235-3; PS79/241-3; PS79/244-2; PS79/247-1; PS79/251-1; PS79/262-3; PS79/267-1; PS79/277-2; PS79/281-1; PS79/287-2; PS79/296-3; PS79/297-3; PS79/298-3; PS79/300-4; PS79/301-3; PS79/302-4; PS79/304-2; PS79/306-2; PS79/307-4; PS79/308-2; PS79/310-4; PS79/311-2; PS79/312-4; PS79/313-4; PS79/314-4; PS79/315-4; PS79/317-4; PS79/318-4; PS79/319-4; PS79/320-3; PS79/321-4; PS79/322-4; PS79/323-2; PS79/324-4; PS79/328-3; PS79/329-4; Salinity; Sample ID; Sample number; Scotia Sea; SO245; SO245_10-1; SO245_1-1; SO245_11-1; SO245_12-2; SO245_13-1; SO245_14-2; SO245_15-2; SO245_2-2; SO245_3-1; SO245_4-1; SO245_5-1; SO245_6-1; SO245_7-4; SO245_8-1; SO245_9-1; SO248; SO248_10-2a; SO248_10-2b; SO248_1-1; SO248_11-1; SO248_12-1; SO248_12-3; SO248_13-3; SO248_14-3; SO248_14-7; SO248_15-1; SO248_16-10; SO248_16-13; SO248_16-15; SO248_16-2; SO248_16-3; SO248_16-5; SO248_17-4; SO248_18-3; SO248_18-5; SO248_19-1; SO248_19-2; SO248_2-1; SO248_2-4; SO248_3-1; SO248_4-1; SO248_4-3; SO248_5-1; SO248_6-1; SO248_6-10; SO248_6-11; SO248_6-13; SO248_6-2; SO248_6-4; SO248_6-5; SO248_7-1; SO248_7-4; SO248_8-2; SO248_8-4; SO248_9-3; SO254; SO254_23-1; SO254_32-1; SO254_38-1; SO254_45-1; SO254_47-1; SO254_59-1; SO254_65-1; Sonne_2; South Atlantic Ocean; South Pacific Ocean; Station label; Temperature, water; Total organic carbon analyzer (TOC), Shimadzu, TOC-VPCH; UltraPac, GEOTRACES; Vessel; Weddell Sea; Year of sampling
    Type: Dataset
    Format: text/tab-separated-values, 11028 data points
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    DATA PANGAEA
  • 8
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    Dissolved organic matter molecular composition data for multiple oceanographic cruises with RV SONNE (SO254, SO245, SO248) and RV POLARSTERN (PS79), Bermuda Atlantic Time-series Study and Hawaii Ocean Time-series (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: This data includes the dissolved organic matter (DOM) molecular composition data obtained via Fourier-transform ion cyclotron resonance mass spectrometry for multiple oceanographic cruises collected in the Atlantic, Pacific and Southern oceans (HOTS, BATS, SO254, SO245, SO248, ANT 28-II, ANT 28-IV, and 28-V) between 2009 and 2017. This analysis was conducted to assess the molecular composition of DOM in the context of ocean mixing. DOM was extracted and desalted using the solid phase extraction method as described in Dittmar et al. 2008. The extracts were stored frozen in methanol until analysis in 2019, when aliquots of the extracts were mixed with 50% ultrapure water (50:50 v/v) and diluted to a final carbon concentration of 2.5 ppm. DOM composition was determined on a SolariX XR FT-ICR-MS (Bruker Daltonik GmbH, Bremen, Germany) equipped with a 15 Tesla superconducting magnet and an electrospray ionization source (ESI; Bruker Apollo II ion source) in negative ion mode, as described in (Bercovici, Dittmar, and Niggemann 2022). Subsequent data processing and molecular formula assignment was conducted in ICBM-OCEAN, as described in (Merder et al. 2020).
    Keywords: ANT-XXVIII/2; ANT-XXVIII/4; ANT-XXVIII/5; BacGeoPac; BAT_SPE; Bering Sea; Canarias Sea; Central Pacific Ocean; CTD/Rosette; CTD-RO; Dissolved Organic Matter; Drake Passage; Equatorial Pacific; Fourier-transform ion cyclotron mass spectrometry; Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS, 15 T Bruker Solarix); Global Ocean; HOT_SPE; Lazarev Sea; Mass of molecular formulas; molecular composition; Molecular formula; MUC; MultiCorer; North Atlantic Ocean; North Pacific Ocean; Peak intensity; Polarstern; Pori Bac NewZ; PS79; PS79/035-3; PS79/036-1; PS79/037-1; PS79/038-2; PS79/039-3; PS79/040-2; PS79/041-3; PS79/042-2; PS79/043-2; PS79/044-1; PS79/045-1; PS79/046-3; PS79/048-1; PS79/049-2; PS79/052-2; PS79/053-3; PS79/054-3; PS79/178-1; PS79/179-1; PS79/193-2; PS79/205-1; PS79/217-1; PS79/232-1; PS79/235-3; PS79/241-3; PS79/244-2; PS79/247-1; PS79/251-1; PS79/262-3; PS79/267-1; PS79/277-2; PS79/281-1; PS79/287-2; PS79/296-3; PS79/297-3; PS79/298-3; PS79/300-4; PS79/301-3; PS79/302-4; PS79/304-2; PS79/306-2; PS79/307-4; PS79/308-2; PS79/310-4; PS79/311-2; PS79/312-4; PS79/313-4; PS79/314-4; PS79/315-4; PS79/317-4; PS79/318-4; PS79/319-4; PS79/320-3; PS79/321-4; PS79/322-4; PS79/323-2; PS79/324-4; PS79/328-3; PS79/329-4; Scotia Sea; SO245; SO245_10-1; SO245_1-1; SO245_11-1; SO245_12-2; SO245_13-1; SO245_14-2; SO245_15-2; SO245_2-2; SO245_3-1; SO245_4-1; SO245_5-1; SO245_6-1; SO245_7-4; SO245_8-1; SO245_9-1; SO248; SO248_10-2a; SO248_10-2b; SO248_1-1; SO248_11-1; SO248_12-1; SO248_12-3; SO248_13-3; SO248_14-3; SO248_14-7; SO248_15-1; SO248_16-10; SO248_16-13; SO248_16-15; SO248_16-2; SO248_16-3; SO248_16-5; SO248_17-4; SO248_18-3; SO248_18-5; SO248_19-1; SO248_19-2; SO248_2-1; SO248_2-4; SO248_3-1; SO248_4-1; SO248_4-3; SO248_5-1; SO248_6-1; SO248_6-10; SO248_6-11; SO248_6-13; SO248_6-2; SO248_6-4; SO248_6-5; SO248_7-1; SO248_7-4; SO248_8-2; SO248_8-4; SO248_9-3; SO254; SO254_23-1; SO254_32-1; SO254_38-1; SO254_45-1; SO254_47-1; SO254_59-1; SO254_65-1; Sonne_2; South Atlantic Ocean; South Pacific Ocean; UltraPac, GEOTRACES; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 6762084 data points
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  • 9
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    Seawater carbonate chemistry and dissolved organic matter dynamics during an oligotrophic ocean acidification experiment using large-scale mesocosms (KOSMOS 2014) (2023)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Dissolved organic matter (DOM) represents a major reservoir of carbon in the oceans. Environmental stressors such as ocean acidification (OA) potentially affect DOM production and degradation processes, e.g., phytoplankton exudation or microbial uptake and biotransformation of molecules. Resulting changes in carbon storage capacity of the ocean, thus, may cause feedbacks on the global carbon cycle. Previous experiments studying OA effects on the DOM pool under natural conditions, however, were mostly conducted in temperate and coastal eutrophic areas. Here, we report on OA effects on the existing and newly produced DOM pool during an experiment in the subtropical North Atlantic Ocean at the Canary Islands during an (1) oligotrophic phase and (2) after simulated deep water upwelling. The last is a frequently occurring event in this region controlling nutrient and phytoplankton dynamics. We manipulated nine large-scale mesocosms with a gradient of pCO2 ranging from 350 up to 1,030 μatm and monitored the DOM molecular composition using ultrahigh-resolution mass spectrometry via Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). An increase of 37 μmol L−1 DOC was observed in all mesocosms during a phytoplankton bloom induced by simulated upwelling. Indications for enhanced DOC accumulation under elevated CO2 became apparent during a phase of nutrient recycling toward the end of the experiment. The production of DOM was reflected in changes of the molecular DOM composition. Out of the 7,212 molecular formulae, which were detected throughout the experiment, 50% correlated significantly in mass spectrometric signal intensity with cumulative bacterial protein production (BPP) and are likely a product of microbial transformation. However, no differences in the produced compounds were found with respect to CO2 levels. Comparing the results of this experiment with a comparable OA experiment in the Swedish Gullmar Fjord, reveals similar succession patterns for individual compound pools during a phytoplankton bloom and subsequent accumulation of these compounds were observed. The similar behavior of DOM production and biotransformation during and following a phytoplankton bloom irrespective of plankton community composition and CO2 treatment provides novel insights into general dynamics of the marine DOM pool.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; DATE/TIME; Day of experiment; Entire community; Event label; Field experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); KOSMOS_2014; KOSMOS_2014_Atlantic-Reference; KOSMOS_2014_Mesocosm-M1; KOSMOS_2014_Mesocosm-M2; KOSMOS_2014_Mesocosm-M3; KOSMOS_2014_Mesocosm-M4; KOSMOS_2014_Mesocosm-M5; KOSMOS_2014_Mesocosm-M6; KOSMOS_2014_Mesocosm-M7; KOSMOS_2014_Mesocosm-M8; KOSMOS_2014_Mesocosm-M9; MESO; Mesocosm experiment; Mesocosm or benthocosm; Nitrogen, total dissolved; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Other studied parameter or process; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Salinity; Sample code/label; Subtropical North Atlantic; Temperate; Temperature, water; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 5864 data points
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    DATA PANGAEA
  • 10
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    Organic complexation of dissolved rare earth elements during an artificially induced phytoplankton spring bloom- a PHREEQC model approach (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: A PHREEQC model was written to investigate complexation of dREEs with components of the dissolved OM pool. Based on the data measured during a mesocosm experiment (maybe link the original dataset) the model simulated chemical speciation of the dREEs in the mesocosms. A new databank was created that includes stability constants for complexes of dREEs with the main inorganic ligands (Cl⁻, SO₄⁻, OH⁻, CO₃⁻) as well as with the strong organic ligand desferrioxamine B (DFOB) after Christenson and Schijf (2011). The model outcome includes concentrations of inorganic and organic dREE complexes as well as abundances as free ions (REE^3+) and total dREE concentrations. Additionally, we calculated the proportions of the different complexes to the total dREE pool. We used two different approaches for the PHREEQC simulations that followed Schijf et al. (2015; doi:10.1016/j.marchem.2015.06.010) and were characterized by the concentration of the strong organic ligand and the resulting proportion of organic complexes to the dREE pool. The 'High-DOC' approach results in a maximal proportion of organic REE-DOC complexes of 40%, the 'Low-DOC' approach results in maximum of 10% organic complexes. To keep an eye on variations in carbonate complexes, total alkalinity (TA) was monitored as well. TA was sampled daily, for the analysis we used a multiscan GO microplate spectrophotometer (Thermo Scientific) and followed the method described by Sarazin et al. (1999; doi:10.1016/S0043-1354(98)00168-7).
    Keywords: Binary Object; File content; mesocosm; North_Sea-Mesocosm; North Sea; PHREEQC; Planktotrons; Rare earth elements
    Type: Dataset
    Format: text/tab-separated-values, 4 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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