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  • 1990-1994  (6)
Document type
Keywords
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Patterns of production and sedimentation in the boreal and polar Northeast Atlantic (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 10 (1991), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Pelagic systems are potentially capable of retaining and recycling all autochthonous organic material, although some losses due to sinking particles inevitably occur. Relating processes in the surface layers quantitatively to vertical particle flux is difficult because only a small percentage of the total production is lost annually via sinking in the open ocean. Further, only a few types of particles contribute to this flux and only a smalt proportion of these may actually reach greater depths.Measurements of vertical flux with sediment traps revealed seasonal and regional patterns also within the northwestern Atlantic and indicate imbalances between particle formation and degradation. The classical pattern of spring bloom sedimentation followed by reduced loss rates has been found in shelf and shallow water regions such as the Norwegian Coastal Current and fjords and is also encountered in the Barents Sea. In the Norwegian Sea. however, the seasonal pattern appears different as the seasonal maximum has been observed during late summer/autumn.The physical environment determines nutrient availability and hence the particles potentially available for sedimentation. The relationship between phyto- and zooplankton governs vertical flux seasonality, and zooplankters with different life cycles and feeding strategies further modify the principle patterns. Herbivores with life-cycle strategies involving overwintering of large biomass and predictable seasonal appearance (copepods, cuphausiids) will have a different impact than opportunistic organisms with very low overwintering biomass, for example salps and ptcropods. The latter exhibit much greater intcrannual biomass variation and may thus contribute to intcrannual variability of the vertical flux. Shelf systems of similar latitude arc generally comparable with respect to their flux patterns and also share similarities with marginal ice zones. Open ocean systems as the Norwegian Sea, however, exhibit different patterns which are similar to the subarctic Pacific.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1991.tb00647.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Vertical flux and microplankton assemblages in the Gulf of Liions during spring 1990 (1992)
    Commission of the European Communities
    In:  Water Pollution Research Reports, 28 . pp. 413-424.
    Details
    Publication Date: 2018-03-20
    Description: A vertical flux pulse related to spring phytoplankton development was recorded ·by moored sediment traps at 42°N 06°E in the Gulf of Lions. May 1990 trap samples from 200m to 2000m depth were comprised of freshly produced organic matter and selected microplankton species from the overlaying water column. This vertical flux event was transmitted to the deep sea floor with a high particle sinking velocity of 〉140 m day-1. Maximal vertical fluxes of 35 mg C m-2 day-1 and 1.2 mg chl.a m-2 day-1 recorded during this event are low compared to the exports from collapsing spring blooms at higher latitudes but demonstrate that particle production and degradation within the spring pelagic system were not in balance.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    The vertical flux of rare earth elements in the northwestern Mediterranean (1992)
    Commission of the European Communities
    In:  In: EROS 2000 (European river ocean system) third workshop of the north-west mediterranean sea. , ed. by Martin, J. M. and Barth, H. Water Pollution Research Reports, 28 . Commission of the European Communities, Brussels, Belgium, pp. 401-412. ISBN 2872630791
    Details
    Publication Date: 2018-03-20
    Description: Rare earth element (REE) composition of sinking particles was examined in time-series sediment trap samples collected from four depths (200, 500, 1000, 2000 m) in the Gulf of Lions. Vertical flux profiles showed the occurrence of a sedimentation pulse which resulted in the rapid sinking of phytoplankton aggregates to 2000 m depth. These particles were characterized by REE patterns similar to those in the upper 200 m indicating that little, if any, additional REE scavenging occurred during the sedimentation event. In contrast, after the sedimentation pulse, particles from deep waters showed an enrichment of light-REE (LREE) relative to heavy-REE (HREE) and a positive Ce anomaly. Comparing REE patterns in particles from the upper water column (200 m) with those from depth (1000, 2000 m) during and following the sedimentation pulse indicates that time is a key factor in determining REE scavenging by sinking particles. This is particularly evident for the preferential scavenging of Ce (IV) which is most pronounced in the finer, slowly sinking, and presumably older particles. These findings are consistent with REE patterns in sea water from the northwestern Mediterranean which show a strong negative Ce anomaly and gradual enrichment of REE with increasing atomic number. The enrichment of LREE relative to HREE in particles from deep waters results either preferential scavenging of LREE on particles, analogous to the enrichment of Ce, or selective dissolution of HREE in association with particle remineralization processes, or both; this aspect of REE behaviour merits further study.
    Type: Book chapter , PeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 4
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    The nose: a characteristic inversion within the salinity maximum water in the tropical northeast Atlantic (1993)
    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 40 (1-2). pp. 537-557.
    Details
    Publication Date: 2020-08-05
    Description: During leg 1 of Meteor cruise 10 in March/April 1989 at 18 circ N, 30 circ W, the high spatial and temporal resolution of hydrographic CTD-stations indicated that the study site was in a hydrographically complex region in the transition zone between the Canary Current and the North Equatorial Current at the southern boundary of the subtropical gyre. Strong variability was found within the upper 120 m due to interleavings of warmer and saltier subtropical salinity maximum water with colder and less saline upper thermocline water. The interleavings caused unexpected nose-like temperature, salinity, nitrate and oxygen profiles yet not described in the literature. A second variability source was found in the Central Water area, because the study area was situated in the vicinity of the Central Water Boundary dividing North and South Atlantic Central Water. Hydrographic analysis of the study shows that interpretations of biological and chemical data can only be done in conjunction with high resolution CTD-profiling
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0645(93)90031-H
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Physical oceanography during METEOR cruise M10/1 (1993)
    PANGAEA
    In:  Supplement to: Podewski, Sigrid; Saure, G; Eppley, Richard W; Koeve, Wolfgang; Peinert, Rolf; Zeitzschel, Bernt (1993): The nose: a characteristic inversion within the salinity maximum water in the tropical northeast Atlantic. Deep Sea Research Part II: Topical Studies in Oceanography, 40(1-2), 537-557, https://doi.org/10.1016/0967-0645(93)90031-H
    Details
    Publication Date: 2024-02-02
    Description: During leg 1 of Meteor cruise 10 in March/April 1989 at 18°N, 30°W, the high spatial and temporal resolution of hydrographic CTD-stations indicated that the study site was in a hydrographically complex region in the transition zone between the Canary Current and the North Equatorial Current at the southern boundary of the subtropical gyre. Strong variability was found within the upper 120 m due to interleavings of warmer and saltier subtropical salinity maximum water with colder and less saline upper thermocline water. The interleavings caused unexpected nose-like temperature, salinity, nitrate and oxygen profiles yet not described in the literature. A second variability source was found in the Central Water area, because the study area was situated in the vicinity of the Central Water Boundary dividing North and South Atlantic Central Water. Hydrographic analysis of the study shows that interpretations of biological and chemical data can only be done in conjunction with high resolution CTD-profiling.
    Keywords: Calculated; Calculated from conductivity; CTD, Neil Brown, Mark III B; CTD/Rosette; CTD profile; CTD-RO; Date/Time of event; Density, sigma-theta (0); DEPTH, water; Elevation of event; Event label; JGOFS; Joint Global Ocean Flux Study; Latitude of event; Longitude of event; M10/1; M10/1-CTD-198_004; M10/1-CTD-199_005; M10/1-CTD-200_006; M10/1-CTD-201_007; M10/1-CTD-202_008; M10/1-CTD-203_009; M10/1-CTD-204_010; M10/1-CTD-205_011; M10/1-CTD-206_012; M10/1-CTD-207_013; M10/1-CTD-208_014; M10/1-CTD-209_015; M10/1-CTD-210_016; M10/1-CTD-211_017; M10/1-CTD-212_018; M10/1-CTD-213_019; M10/1-CTD-214_020; M10/1-CTD-215_021; M10/1-CTD-216_022; M10/1-CTD-217_023; M10/1-CTD-218_024; M10/1-CTD-219_025; M10/1-CTD-220_026; M10/1-CTD-221_027; M10/1-CTD-222_028; M10/1-CTD-223_029; M10/1-CTD-224_030; M10/1-CTD-225_031; M10/1-CTD-226_032; M10/1-CTD-227_033; M10/1-CTD-228_034; M10/1-CTD-229_035; M10/1-CTD-230_036; M10/1-CTD-231_037; M10/1-CTD-232_038; M10/1-CTD-233_039; M10/1-CTD-234_040; M10/1-CTD-235_041; M10/1-CTD-236_042; M10/1-CTD-237_043; M10/1-CTD-238_044; M10/1-CTD-239_045; M10/1-CTD-240_046; M10/1-CTD-241_047; M10/1-CTD-242_048; M10/1-CTD-244_049; M10/1-CTD-245_050; M10/1-CTD-246_051; M10/1-CTD-247_052; M10/1-CTD-249_053; M10/1-CTD-250_054; M10/1-CTD-251_055; M10/1-CTD-252_056; M10/1-CTD-253_057; M10/1-CTD-254_058; M10/1-CTD-255_059; M10/1-CTD-256_060; M10/1-CTD-256_061; M10/1-CTD-256_062; M10/1-CTD-257_063; M10/1-CTD-258_064; M10/1-CTD-259_065; M10/1-CTD-259_066; M10/1-CTD-260_067; M10/1-CTD-261_068; M10/1-CTD-262_069; M10/1-CTD-262_070; M10/1-CTD-262_071; M10/1-CTD-262_072; M10/1-CTD-262_073; M10/1-CTD-263_074; M10/1-CTD-264_075; M10/1-CTD-266_076; M10/1-CTD-267_077; M10/1-CTD-270_078; M10/1-CTD-273_079; M10/1-CTD-274_080; M10/1-CTD-277_081; M10/1-CTD-278_082; M10/1-CTD-279_083; M10/1-CTD-280_084; M10/1-CTD-282_085; M10/1-CTD-283_086; M10/1-CTD-284_087; M10/1-CTD-285_088; M10/1-CTD-286_089; M10/1-CTD-287_090; M10/1-CTD-288_091; M10/1-CTD-289_092; M10/1-CTD-290_093; M10/1-CTD-291_094; M10/1-CTD-291_095; M10/1-CTD-291_096; M10/1-CTD-291_097; M10/1-CTD-292_098; M10/1-CTD-293_099; M10/1-CTD-294_100; M10/1-CTD-295_101; M10/1-CTD-296_102; M10/1-CTD-297_103; M10/1-CTD-298_104; M10/1-CTD-299_105; M10/1-CTD-300_106; M10/1-CTD-301_107; M10/1-CTD-302_108; M10/1-CTD-303_109; M10/1-CTD-304_110; M10/1-CTD-305_111; M10/1-CTD-306_112; M10/1-CTD-307_113; M10/1-CTD-308_114; M10/1-CTD-309_115; M10/1-CTD-310_116; M10/1-CTD-311_117; M10/1-CTD-312_118; M10/1-CTD-313_119; M10/1-CTD-314_120; M10/1-CTD-315_121; M10/1-CTD-316_122; M10/1-CTD-317_123; M10/1-CTD-318_124; M10/1-CTD-319_125; M10/1-CTD-320_126; M10/1-CTD-321_127; M10/1-CTD-322_128; Meteor (1986); NABE; North Atlantic Bloom Experiment, 1989-1991; Pressure, water; Salinity; Temperature, water; Temperature, water, potential
    Type: Dataset
    Format: text/tab-separated-values, 263145 data points
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    DATA PANGAEA
  • 6
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    Hydrochemistry measured on water bottle samples during METEOR cruise M10/1 (1993)
    PANGAEA
    In:  Supplement to: Passow, Uta; Peinert, Rolf (1993): The role of plankton in particle flux; two case studies from the northeast Atlantic. Deep Sea Research Part II: Topical Studies in Oceanography, 40(1-2), 573-585, https://doi.org/10.1016/0967-0645(93)90033-J
    Details
    Publication Date: 2024-02-02
    Description: The relationship between the vertical flux of microplankton and its standing stock in the upper ocean was determined in the subtropical (33°N, 21°W) and tropical (18°N, 30°W) northeast Atlantic in spring 1989 as part of the North Atlantic Bloom Experiment. In the subtropical area specific sedimentation rates at all depths were low (0.1% of standing stock) and 10-20% of settled particulate organic carbon (POC) was viable diatoms. The high contribution of viable diatoms, their empty frustules and tintinnid loricae to settled material characterized a system in transition between a diatom bloom sedimentation event and an oligotrophic summer situation. In the tropical area specific sedimentation rates were similar, but absolute rates (3 mg C m?2 day?1) were only about a third of those in the subtropical area. Microplankton carbon contributed only 2-6% to POC. Hard parts of heterotrophs found embedded in amorphous detrital matter suggest that particles had passed through a complex food web prior to sedimentation. Coccolithophorids, not diatoms dominated the autotrophic fraction in traps, and a shift in the composition of autotrophs may indicate a perturbation of the oligotrophic system.
    Keywords: Ammonium; Bottle, Niskin 30-L; Carbon, organic, particulate; Carbon/nitrogen analyser (GF/F filtered); Chlorophyll a; Chlorophyll a, fluorometric determination (Grasshoff et al., 1983, Chemie GmbH); Colorometric analysis, manual; Continuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1); Date/Time of event; DEPTH, water; Elevation of event; Event label; Gravimetric analysis (GF/F filtered); JGOFS; Joint Global Ocean Flux Study; Latitude of event; Longitude of event; M10/1; M10/1-RO6-241_003; M10/1-RO6-241_004; M10/1-RO6-245_006; M10/1-RO6-245_007; M10/1-RO6-249_009; M10/1-RO6-249_010; M10/1-RO6-254_011; M10/1-RO6-254_012; M10/1-RO6-260_013; M10/1-RO6-260_014; M10/1-RO6-266_016; M10/1-RO6-266_017; M10/1-RO6-273_020; M10/1-RO6-273_021; M10/1-RO6-279_024; M10/1-RO6-279_025; M10/1-RO6-283_028; M10/1-RO6-283_029; M10/1-RO6-287_031; M10/1-RO6-287_032; M10/1-RO6-292_034; M10/1-RO6-292_035; M10/1-RO6-361_039; M10/1-RO6-361_040; M10/1-RO6-366_044; M10/1-RO6-366_045; M10/1-RO6-370_046; M10/1-RO6-370_047; M10/1-RO6-376_049; M10/1-RO6-376_050; M10/1-RO6-382_054; M10/1-RO6-382_055; M10/1-RO6-387_058; M10/1-RO6-387_059; M10/1-RO6-387_060; M10/1-RO6-393_063; M10/1-RO6-393_064; M10/1-RO6-398_067; M10/1-RO6-398_068; M10/1-RO6-398_069; M10/1-RO6-403_071; M10/1-RO6-403_072; Meteor (1986); NABE; NIS_30L; Nitrate and Nitrite; Nitrite; Nitrogen, organic, particulate; North Atlantic Bloom Experiment, 1989-1991; Oxidation; then autoanalysis (GF/F filtered); Oxidation (alkaline) with borate buffered potassium persulphate; Phosphate; Phosphorus, particulate; Silicate; Silicon, particulate; Suspended matter, total
    Type: Dataset
    Format: text/tab-separated-values, 1700 data points
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    DATA PANGAEA
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