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  • 1
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    Primary production using ¹⁴C method in subtropical gyres regions (2019)
    PANGAEA
    In:  Supplement to: Regaudie-de-Gioux, Aurore; Huete-Ortega, Maria; Sobrino, Cristina; López-Sandoval, Daffne C; González, N; Fernández-Carrera, Ana; Vidal, Montserrat; Marañón, Emilio; Cermeño, Pedro; Latasa, Mikel; Agustí, Susana; Duarte, Carlos Manuel (2019): Multi-model remote sensing assessment of primary production in the subtropical gyres. Journal of Marine Systems, 196, 97-106, https://doi.org/10.1016/j.jmarsys.2019.03.007
    Details
    Publikationsdatum: 2023-09-20
    Beschreibung: Seawater was sampled from five depths in the euphotic zone corresponding to 100 % (ca. 3 m depth), 50 %, 20 %, 7 % and 1 % of incident Photosynthetically Active Radiation (PAR). For each depth, four 72 mL polystyrene bottles (three clear bottles and one dark bottle) were filled with unfiltered seawater, inoculated with 10 - 20 µCi NaH¹⁴CO₃ and incubated on-deck from dawn to dusk. Temperature and irradiance in the incubators simulated the water temperature and the incident irradiance at the corresponding depth of each sample by using a combination of neutral density and blue filters (Mist Blue, ref. 061, Lee Filters ®). After incubation, samples from three of the five depths (100 %, 20 % and 1 % PAR) were sequentially filtered through 20, 2 and 0.2 µm polycarbonate filters while the other depths (50 % and 7 % PAR) were directly filtered by 0.2 µm. Immediately after filtering, filters were then exposed to concentrated HCl fumes at least 12 h to remove the non-fixed inorganic ¹⁴C. Filters were placed in scintillation vials to which 5 mL of liquid scintillation cocktail was added. The radioactivity on each filter (disintegrations per minute, DPM) was determined using a Wallac scintillation counter. To compute the rate of photosynthetic carbon fixation, the dark-bottle DPM was subtracted from the light-bottle DPM values. A constant value of 24,720 µg L-1 (or 2,060 µmol L-1) was assumed for the concentration of dissolved inorganic carbon for surface waters in tropical ocean (Key et al., 2004). A correction factor of 1.05 was applied to this constant value for discrimination isotopic. Total primary production was calculated as the sum of the primary production on each size class.
    Schlagwort(e): 29HE20101215; 29HE20110117; 29HE20110211; 29HE20110317; 29HE20110416; 29HE20110513; 29HE20110619; CSIC; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Event label; Hespérides; Latitude of event; Longitude of event; MALASPINA_LEG1; MALASPINA_LEG1_006-3; MALASPINA_LEG1_007-3; MALASPINA_LEG1_008-3; MALASPINA_LEG1_009-3; MALASPINA_LEG1_010-3; MALASPINA_LEG1_011-3; MALASPINA_LEG1_012-3; MALASPINA_LEG1_013-3; MALASPINA_LEG1_014-3; MALASPINA_LEG1_015-3; MALASPINA_LEG1_016-3; MALASPINA_LEG1_017-3; MALASPINA_LEG1_018-3; MALASPINA_LEG1_019-3; MALASPINA_LEG1_020-3; MALASPINA_LEG1_022-3; MALASPINA_LEG1_023-3; MALASPINA_LEG1_024-3; MALASPINA_LEG1_025-3; MALASPINA_LEG1_026-3; MALASPINA_LEG2; MALASPINA_LEG2_027-3; MALASPINA_LEG2_028-3; MALASPINA_LEG2_029-3; MALASPINA_LEG2_030-3; MALASPINA_LEG2_031-3; MALASPINA_LEG2_032-3; MALASPINA_LEG2_033-3; MALASPINA_LEG2_034-3; MALASPINA_LEG2_035-3; MALASPINA_LEG2_037-3; MALASPINA_LEG2_038-3; MALASPINA_LEG2_040-3; MALASPINA_LEG2_041-3; MALASPINA_LEG2_042-3; MALASPINA_LEG2_043-3; MALASPINA_LEG2_044-3; MALASPINA_LEG3; MALASPINA_LEG3_046-3; MALASPINA_LEG3_047-3; MALASPINA_LEG3_048-3; MALASPINA_LEG3_049-3; MALASPINA_LEG3_050-3; MALASPINA_LEG3_051-3; MALASPINA_LEG3_052-3; MALASPINA_LEG3_053-3; MALASPINA_LEG3_054-3; MALASPINA_LEG3_055-3; MALASPINA_LEG3_056-3; MALASPINA_LEG3_057-3; MALASPINA_LEG3_058-3; MALASPINA_LEG3_059-3; MALASPINA_LEG3_060-3; MALASPINA_LEG3_061-3; MALASPINA_LEG3_062-3; MALASPINA_LEG3_063-3; MALASPINA_LEG3_064-3; MALASPINA_LEG3_065-3; MALASPINA_LEG3_066-3; MALASPINA_LEG3_068-3; MALASPINA_LEG4; MALASPINA_LEG4_069-3; MALASPINA_LEG4_070-3; MALASPINA_LEG4_071-3; MALASPINA_LEG4_072-3; MALASPINA_LEG4_073-3; MALASPINA_LEG4_074-3; MALASPINA_LEG4_075-3; MALASPINA_LEG4_076-3; MALASPINA_LEG5; MALASPINA_LEG5_083-3; MALASPINA_LEG5_084-3; MALASPINA_LEG5_085-3; MALASPINA_LEG5_086-3; MALASPINA_LEG5_087-3; MALASPINA_LEG5_088-3; MALASPINA_LEG5_089-3; MALASPINA_LEG5_090-3; MALASPINA_LEG5_091-3; MALASPINA_LEG5_092-3; MALASPINA_LEG5_093-3; MALASPINA_LEG5_094-3; MALASPINA_LEG5_095-3; MALASPINA_LEG5_096-3; MALASPINA_LEG5_097-3; MALASPINA_LEG5_098-3; MALASPINA_LEG5_099-3; MALASPINA_LEG6; MALASPINA_LEG6_104-3; MALASPINA_LEG6_106-3; MALASPINA_LEG6_107-3; MALASPINA_LEG6_108-3; MALASPINA_LEG6_109-3; MALASPINA_LEG6_110-3; MALASPINA_LEG6_111-3; MALASPINA_LEG6_113-3; MALASPINA_LEG6_114-3; MALASPINA_LEG6_115-3; MALASPINA_LEG6_117-3; MALASPINA_LEG6_118-3; MALASPINA_LEG6_119-3; MALASPINA_LEG6_120-3; MALASPINA_LEG6_121-3; MALASPINA_LEG6_122-3; MALASPINA_LEG6_123-3; MALASPINA_LEG6_124-3; MALASPINA_LEG6_125-3; MALASPINA_LEG6_126-3; MALASPINA_LEG7; MALASPINA_LEG7_127-3; MALASPINA_LEG7_128-3; MALASPINA_LEG7_129-3; MALASPINA_LEG7_130-3; MALASPINA_LEG7_131-3; MALASPINA_LEG7_132-3; MALASPINA_LEG7_133-3; MALASPINA_LEG7_134-3; MALASPINA_LEG7_135-3; MALASPINA_LEG7_136-3; MALASPINA_LEG7_137-3; MALASPINA_LEG7_138-3; MALASPINA_LEG7_139-3; MALASPINA_LEG7_140-3; MALASPINA_LEG7_141-3; MALASPINA_LEG7_142-3; MALASPINA_LEG7_143-3; MALASPINA_LEG7_144-3; MALASPINA_LEG7_145-3; MALASPINA_LEG7_146-3; MALASPINA_LEG7_147-3; MALASPINA-2010; Malaspina circumnavigation expedition; MH008_006; MH009_007; MH010_008; MH011_009; MH012_010; MH013_011; MH014_012; MH015_013; MH016_014; MH017_015; MH018_016; MH019_017; MH020_018; MH021_019; MH022_020; MH024_022; MH025_023; MH026_024; MH027_025; MH028_026; MH036_027; MH037_028; MH038_029; MH039_030; MH040_031; MH041_032; MH042_033; MH043_034; MH044_035; MH046_037; MH047_038; MH049_040; MH050_041; MH051_042; MH052_043; MH053_044; MH062_046; MH063_047; MH064_048; MH065_049; MH066_050; MH067_051; MH072_052; MH073_053; MH074_054; MH075_055; MH076_056; MH077_057; MH078_058; MH079_059; MH080_060; MH081_061; MH082_062; MH083_063; MH084_064; MH085_065; MH086_066; MH088_068; MH095_069; MH096_070; MH097_071; MH098_072; MH099_073; MH100_074; MH101_075; MH102_076; MH127_083; MH128_084; MH129_085; MH130_086; MH131_087; MH132_088; MH133_089; MH134_090; MH135_091; MH136_092; MH137_093; MH138_094; MH139_095; MH140_096; MH141_097; MH142_098; MH143_099; MH153_104; MH155_106; MH156_107; MH157_108; MH158_109; MH159_110; MH160_111; MH162_113; MH163_114; MH164_115; MH166_117; MH167_118; MH168_119; MH169_120; MH170_121; MH171_122; MH172_123; MH173_124; MH174_125; MH175_126; MH188_127; MH189_128; MH190_129; MH191_130; MH193_131; MH194_132; MH195_133; MH196_134; MH197_135; MH198_136; MH199_137; MH200_138; MH201_139; MH202_140; MH203_141; MH204_142; MH205_143; MH206_144; MH207_145; MH208_146; MH209_147; primary production; Primary production of carbon, standard deviation; Primary production of carbon per hour; see abstract; subtropical gyres
    Materialart: Dataset
    Format: text/tab-separated-values, 1241 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 2
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    Biological nitrogen fixation and stable isotopes of carbon in seston during Meteor cruise M130 (2023)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Biological nitrogen fixation is a key process balancing the loss of combined nitrogen in the marine nitrogen cycle. Its relevance in upwelling systems is not fully resolved. This dataset contains rates of nitrogen fixation through the euphotic layer in two size fractions measured following Montoya et al (1996) technique. It also contains the stable isotopes of carbon in seston expressed in delta notation (δ13C, ‰, VPDB). We sampled in the region of the Guinea Dome and Equatorial Atlantic Ocean along 23°W during Meteor cruise M130 in August-September 2016. Water samples were collected by niskin bottles attached to a rosette equipped with CTD sensors. Incubations were done in on-deck incubators refrigerated by running surface water continuously and simulating the light intensity of each depth by neutral density filters or meshes.
    Schlagwort(e): Abbreviation; biological nitrogen fixation; Calculated according to Fry (2006); Calculated according to Montoya et al. (1996); Continuous flow isotope ratio mass spectrometer (CF-IRMS), Micromass, Isoprime; coupled with Elemental analyser, Carlo Erba, NA 2500; CTD, Sea-Bird, SBE 11 plus; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; diazotrophs; ELEVATION; Equatorial Atlantic; Event label; Gear; Guinea Dome; Incubation duration; LATITUDE; Location; LONGITUDE; M130; M130_1002-1; M130_1005-1; M130_1010-1; M130_1016-1; M130_1019-1; M130_1027-1; M130_1031-1; M130_1037-1; M130_1042-1; M130_1045-1; M130_1047-1; M130_1050-1; M130_1051-1; M130_1054-1; M130_1056-1; M130_1060-1; M130_1068-1; M130_1069-1; M130_1078-1; M130_1080-1; M130_1090-1; M130_1092-1; M130_1094-1; M130_1096-1; M130_1100-1; M130_1104-1; M130_941-1; M130_949-1; M130_952-1; M130_955-1; M130_957-1; M130_959-1; M130_962-1; M130_966-1; M130_969-1; M130_972-1; M130_974-1; M130_976-1; M130_981-1; M130_983-1; M130_989-1; M130_994-1; M130_998-1; Meteor (1986); Nitrogen; Nitrogen, 15N labeled; Nitrogen, particulate, size fraction 〈10 µm; Nitrogen, particulate, size fraction 〈10 µm, standard deviation; Nitrogen, particulate, size fraction 〉 10 µm; Nitrogen, particulate, size fraction 〉 10 µm, standard deviation; Nitrogen fixation rate, size fraction 〈 10 µm; Nitrogen fixation rate, size fraction 〈 10 µm, standard deviation; Nitrogen fixation rate, size fraction 〉 10 µm; Nitrogen fixation rate, size fraction 〉 10 µm, standard deviation; Nitrogen fixation rate, total; Nitrogen fixation rate, total, standard deviation; Salinity; Sample volume; Temperature, water; Trichodesmium, carbon in seston; δ13C, seston
    Materialart: Dataset
    Format: text/tab-separated-values, 1101 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 3
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    Biological nitrogen fixation and stable isotopes of carbon in seston during Meteor cruise M119 (2023)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Biological nitrogen fixation is a key process balancing the loss of combined nitrogen in the marine nitrogen cycle. Its relevance in upwelling systems is not fully resolved. This dataset contains rates of nitrogen fixation through the euphotic layer in two size fractions measured following Montoya et al (1996) technique. It also contains the stable isotopes of carbon in seston expressed in delta notation (δ13C, ‰, VPDB). We sampled in the region of the Guinea Dome and Equatorial Atlantic Ocean along 23°W during Meteor cruise M119 in September 2015. Water samples were collected by niskin bottles attached to a rosette equipped with CTD sensors. Incubations were done in on-deck incubators refrigerated by running surface water continuously and simulating the light intensity of each depth by neutral density filters or meshes.
    Schlagwort(e): Abbreviation; biological nitrogen fixation; Calculated according to Fry (2006); Calculated according to Montoya et al. (1996); Continuous flow isotope ratio mass spectrometer (CF-IRMS), Micromass, Optima; coupled with Elemental analyser, Carlo Erba, NC2500; CTD, Sea-Bird, SBE 11 plus; CTD/Rosette; CTD003; CTD005; CTD007; CTD009; CTD010; CTD012; CTD013; CTD015; CTD018; CTD019; CTD022; CTD024; CTD026; CTD031; CTD032; CTD033; CTD035; CTD036; CTD038; CTD040; CTD042; CTD043; CTD045; CTD047; CTD049; CTD050; CTD051; CTD052; CTD053; CTD-RO; DATE/TIME; DEPTH, water; diazotrophs; ELEVATION; Equatorial Atlantic; Event label; Gear; Guinea Dome; Incubation duration; LATITUDE; Location; LONGITUDE; M119; M119_692-1; M119_698-1; M119_703-1; M119_706-1; M119_708-1; M119_718-1; M119_722-1; M119_724-1; M119_731-1; M119_733-1; M119_737-1; M119_740-1; M119_745-1; M119_755-1; M119_756-1; M119_758-1; M119_761-1; M119_762-1; M119_765-1; M119_770-1; M119_780-1; M119_781-1; M119_783-1; M119_785-1; M119_788-1; M119_789-1; M119_791-1; M119_792-1; M119_793-1; Meteor (1986); Nitrogen; Nitrogen, 15N labeled; Nitrogen, particulate, size fraction 〈10 µm; Nitrogen, particulate, size fraction 〈10 µm, standard deviation; Nitrogen, particulate, size fraction 〉 10 µm; Nitrogen, particulate, size fraction 〉 10 µm, standard deviation; Nitrogen fixation rate, size fraction 〈 10 µm; Nitrogen fixation rate, size fraction 〈 10 µm, standard deviation; Nitrogen fixation rate, size fraction 〉 10 µm; Nitrogen fixation rate, size fraction 〉 10 µm, standard deviation; Nitrogen fixation rate, total; Nitrogen fixation rate, total, standard deviation; Salinity; Sample code/label; Sample volume; Temperature, water; Trichodesmium, carbon in seston; δ13C, seston
    Materialart: Dataset
    Format: text/tab-separated-values, 1170 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
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    Trans-Atlantic Equatorial cruise I, Cruise No. M158, September 19 - October 26, 2019, Walvis Bay (Namibia) - Recife (Brazil) (2019)
    Gutachterpanel Forschungsschiffe
    Details
    Publikationsdatum: 2023-09-19
    Materialart: Report , NonPeerReviewed , info:eu-repo/semantics/book
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Fahrtbericht
  • 5
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    The Photophysiological Response of Nitrogen-Limited Phytoplankton to Episodic Nitrogen Supply Associated With Tropical Instability Waves in the Equatorial Atlantic (2022)
    Frontiers
    Details
    Publikationsdatum: 2024-02-07
    Beschreibung: In the Equatorial Atlantic nitrogen availability is assumed to control phytoplankton dynamics. However, in situ measurements of phytoplankton physiology and productivity are surprisingly sparse in comparison with the North Atlantic. In addition to the formation of the Equatorial cold tongue in the boreal summer, tropical instability waves (TIWs) and related short-term processes may locally cause episodic events of enhanced nutrient supply to the euphotic layer. Here, we assess changes in phytoplankton photophysiology in response to such episodic events as well as short-term nutrient addition experiments using a pair of custom-built fluorometers that measure chlorophyll a (Chl a) variable fluorescence and fluorescence lifetimes. The fluorometers were deployed during a transatlantic cruise along the Equator in the fall of 2019. We hypothesized that the Equatorial Atlantic is nitrogen-limited, with an increasing degree of limitation to the west where the cold tongue is not prominent, and that infrequent nitrate injection by TIW related processes are the primary source alleviating this limitation. We further hypothesized phytoplankton are well acclimated to the low levels of nitrogen, and once nitrogen is supplied, they can rapidly utilize it to stimulate growth and productivity. Across three TIW events encountered, we observed increased productivity and chlorophyll a concentration concurrent with a decreased photochemical conversion efficiency and overall photophysiological competency. Moreover, the observed decrease in photosynthetic turnover rates toward the western section suggested a 70% decrease in growth rates compared to their maximum values under nutrient-replete conditions. This decrease aligned with the increased growth rates observed following 24 h incubation with added nitrate in the western section. These results support our hypotheses that nitrogen is the limiting factor in the region and that phytoplankton are in a state of balanced growth, waiting to “body surf” waves of nutrients which fuel growth and productivity.
    Materialart: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
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  • 6
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    Nitrogen fixation rates in the Guinea Dome and the equatorial upwelling regions in the Atlantic Ocean (2023)
    Springer
    Details
    Publikationsdatum: 2024-02-07
    Beschreibung: Biological nitrogen fixation is a key process balancing the loss of combined nitrogen in the marine nitrogen cycle. Its relevance in upwelling or high nutrient regions is still unclear, with the few available studies in these regions of the ocean reporting rates that vary widely from below detection limit to 〉 100 nmol N L−1 d−1. In the eastern tropical Atlantic Ocean, two open ocean upwelling systems are active in boreal summer. One is the seasonal equatorial upwelling, where the residual phosphorus associated with aged upwelled waters is suggested to enhance nitrogen fixation in this season. The other is the Guinea Dome, a thermal upwelling dome. We conducted two surveys along 23° W across the Guinea Dome and the Equator from 15° N to 5° S in September 2015 and August–September 2016 with high latitudinal resolution (20–60 nm between stations). The abundance of Trichodesmium colonies was characterized by an Underwater Vision Profiler 5 and the total biological nitrogen fixation in the euphotic layer was measured using the 15N2 technique. The highest abundances of Trichodesmium colonies were found in the area of the Guinea Dome (9°–15° N) with a maximum of 3 colonies L−1 near the surface. By contrast, colonies were almost absent in the Equatorial band between 2° N and 5° S. The highest nitrogen fixation rate was measured at the northern edge of the Guinea Dome in 2016 (ca. 31 nmol N L−1 d−1). In this region, where diazotrophs thrived on a sufficient supply of both phosphorus and iron, a patchy distribution was unveiled by our increased spatial resolution scheme. In the Equatorial band, rates were considerably lower, ranging from below detection limit to ca. 4 nmol N L−1 d−1, with a clear difference in magnitude between 2015 (rates close to zero) and 2016 (average rates around 2 nmol N L−1 d−1). This difference seemed triggered by a contrasting supply of phosphorus between years. Our study stresses the importance of surveys with sampling at fine-scale spatial resolution, and shows unexpected high variability in the rates of nitrogen fixation in the Guinea Dome, a region where diazotrophy is a significant process supplying new nitrogen into the euphotic layer.
    Materialart: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
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  • 7
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    Trans-Atlantic Equatorial cruise II, Cruise No. M181, April 17 - May 28, 2022, Cape Town (South Africa) - Mindelo (Cape Verde) (2022)
    Gutachterpanel Forschungsschiffe
    Details
    Publikationsdatum: 2023-06-21
    Materialart: Report , NonPeerReviewed , info:eu-repo/semantics/book
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Fahrtbericht
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