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  • 1
    Online Resource
    Online Resource
    Meso- and submesoscale variability within the Peruvian upwelling regime : mechanisms of oxygen supply to the subsurface ocean (2016)
    Kiel
    Details Availability
    Keywords: Hochschulschrift ; Peru ; Küstenmeer ; Sauerstoff ; Zirkulationsmodell
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource
    URL: http://nbn-resolving.de/urn:nbn:de:gbv:8-diss-184934
    URL: http://d-nb.info/109622089X/34
    URL: http://macau.uni-kiel.de/receive/dissertation_diss_00018493
    URN: urn:nbn:de:gbv:8-diss-184934
    DDC: 550
    Language: English
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  • 2
    Online Resource
    Online Resource
    Variabilität von Vermischungsprozessen und diapyknischen Wärmeflüssen im äquatorialen Atlantik bei 23° West (2010)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (43 Blatt = 3 MB) , Illustrationen
    URL: https://oceanrep.geomar.de/11832/
    Language: German
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 3
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    The formation of a subsurface anticyclonic eddy in the Peru-Chile Undercurrent and its impact on the near-coastal salinity, oxygen and nutrient distributions (2016)
    PANGAEA
    In:  Supplement to: Thomsen, Soeren; Kanzow, Torsten; Krahmann, Gerd; Greatbatch, Richard J; Dengler, Marcus; Lavik, Gaute (2016): The formation of a subsurface anticyclonic eddy in the Peru-Chile Undercurrent and its impact on the near-coastal salinity, oxygen, and nutrient distributions. Journal of Geophysical Research: Oceans, 121(1), 476-501, https://doi.org/10.1002/2015JC010878
    Details
    Publication Date: 2023-12-04
    Description: The formation of a subsurface anticyclonic eddy in the Peru-Chile Undercurrent (PCUC) in January and February 2013 is investigated using a multi-platform four-dimensional observational approach. Research vessel, multiple glider and mooring-based measurements were conducted in the Peruvian upwelling regime near 12°30'S. The dataset consists of more than 10000 glider profiles and repeated vessel-based hydrography and velocity transects. It allows a detailed description of the eddy formation and its impact on the near-coastal salinity, oxygen and nutrient distributions. In early January, a strong PCUC with maximum poleward velocities of ca. 0.25 m/s at 100 to 200 m depth was observed. Starting on January 20 a subsurface anticyclonic eddy developed in the PCUC downstream of a topographic bend, suggesting flow separation as the eddy formation mechanism. The eddy core waters exhibited oxygen concentrations less than 1mol/kg, an elevated nitrogen-deficit of ca. 17µmol/l and potential vorticity close to zero, which seemed to originate from the bottom boundary layer of the continental slope. The eddy-induced across-shelf velocities resulted in an elevated exchange of water masses between the upper continental slope and the open ocean. Small scale salinity and oxygen structures were formed by along-isopycnal stirring and indications of eddy-driven oxygen ventilation of the upper oxygen minimum zone were observed. It is concluded that mesoscale stirring of solutes and the offshore transport of eddy core properties could provide an important coastal open-ocean exchange mechanism with potentially large implications for nutrient budgets and biogeochemical cycling in the oxygen minimum zone off Peru.
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: application/zip, 14 datasets
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  • 4
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    Influence of intraseasonal eastern boundary circulation variability on hydrography and biogeochemistry off Peru (2019)
    PANGAEA
    In:  Supplement to: Lüdke, Jan; Dengler, Marcus; Sommer, Stefan; Clemens, David; Thomsen, Soeren; Krahmann, Gerd; Dale, Andy W; Achterberg, Eric Pieter; Visbeck, Martin (2020): Influence of intraseasonal eastern boundary circulation variability on hydrography and biogeochemistry off Peru. Ocean Science, 16(6), 1347-1366, https://doi.org/10.5194/os-16-1347-2020
    Details
    Publication Date: 2023-12-05
    Description: The intraseasonal evolution of physical and biogeochemical properties during a coastal trapped wave event off central Peru is analysed using data from an extensive shipboard observational programme conducted between April and June 2017, and remote sensing data. The poleward velocities in the Peru Chile Undercurrent were highly variable and strongly intensified to above 0.5 m s-1 between mid and end of May. This intensification was likely caused by a first baroclinic mode downwelling coastal trapped wave, excited by a westerly wind anomaly at the equator and originating at about 95° W. Local winds along the South American coast did not impact the wave. Although there is general agreement between the observed cross-shore-depth velocity structure of the coastal trapped wave and the velocity structure of first vertical mode solution of a linear wave model, there are differences in the details of the two flow distributions. The enhanced poleward flow increased water mass advection from the equatorial current system to the study site. The resulting shorter alongshore transit times between the equator and the coast off central Peru led to a strong increase in nitrate concentrations, less anoxic water, likely less fixed nitrogen loss to N2, and a decrease of the nitrogen deficit compared to the situation before the poleward flow intensification. This study highlights the role of changes in the alongshore advection due to coastal trapped waves for the nutrient budget and the cumulative strength of N-cycling in the Peruvian oxygen minimum zone. Enhanced availability of nitrate may impact a range of pelagic and benthic elemental cycles, as it represents a major electron acceptor for organic carbon degradation during denitrification and is involved in sulfide oxidation in sediments.
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 5
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    Remote and local drivers of oxygen and nitrate variability in the shallow oxygen minimum zone off Mauritania in June 2014 (2019)
    PANGAEA
    In:  Supplement to: Thomsen, Soeren; Karstensen, Johannes; Kiko, Rainer; Krahmann, Gerd; Dengler, Marcus; Engel, Anja (2019): Remote and local drivers of oxygen and nitrate variability in the shallow oxygen minimum zone off Mauritania in June 2014. Biogeosciences, 16(5), 979-998, https://doi.org/10.5194/bg-16-979-2019
    Details
    Publication Date: 2024-02-20
    Description: Upwelling systems play a key role in the global carbon and nitrogen cycles and are also of local relevance due to their high productivity and fish resources. To capture and understand the high spatial and temporal variability of physical and biogeochemical parameters found in these regions novel measurement technics have to be combined in an interdisciplinary manner. Here we use high-resolution glider-based physical-biogeochemical observations in combination with ship-based underwater vision profiler, sensor and bottle data to investigate the drivers of oxygen and nitrate variability across the shelf break off Mauritania in June 2014. Distinct oxygen and nitrate variability shows up in our glider data. High oxygen and low nitrate anomalies were clearly related to water mass variability and probably linked to ocean transport. Low oxygen and high nitrate patches co-occurred with enhanced turbidity signals close to the seabed, which suggests locally high microbial respiration of resuspended organic matter near the sea floor. This interpretation is supported by high particle abundance observed by the underwater vision profiler and enhanced particle-based respiration rate estimates close to the seabed. Discrete in-situ measurements of dissolved organic carbon and amino acids suggest the formation of dissolved organic carbon due to particle dissolution near the seabed fueling additional microbial respiration. Our high-resolution interdisciplinary observations highlight the complex interplay of remote and local physical-biogeochemical drivers of oxygen and nitrate variability off Mauritania, which cannot be captured by classical shipboard observations alone.
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 6
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    Underway measurements for 2-day upwelling front experiment during METEOR cruise M93 (2017)
    PANGAEA
    In:  Supplement to: Köhn, Eike; Thomsen, Soeren; Arévalo-Martínez, Damian L; Kanzow, Torsten (2017): Submesoscale CO2 variability across an upwelling front off Peru. Ocean Science, 13(6), 1017-1033, https://doi.org/10.5194/os-13-1017-2017
    Details
    Publication Date: 2024-01-20
    Description: While being a major source for atmospheric CO2 the Peruvian upwelling region exhibits strong variability in surface fCO2 on short spatial and temporal scales. Understanding the physical processes driving the strong variability is of fundamental importance for constraining the effect of marine emissions from upwelling regions on the global CO2 budget. In this study, a frontal decay on length scales of (10km) was observed off the Peruvian coast following a pronounced decrease in downfrontal wind speed with a time lag of 9 hours. Simultaneously, the sea-to-air flux of CO2 on the inshore (cold) side of the front dropped from up to 80 to 10 mmol/m**2/day, while the offshore (warm) side of the front was constantly outgassing at a rate of 10-20 mmol/m**2/day. Based on repeated ship transects the decay of the front was observed to occur in two phases. The first phase was characterized by a development of coherent surface temperature anomalies which gained in amplitude over 6-9 hours. The second phase was characterized by a disappearance of the surface temperature front within 6 hours. Submesoscale mixed layer instabilities were present but seem too slow to completely remove the temperature gradient in this short time period. Dynamics such as a pressure driven gravity current appear to be a likely mechanism behind the evolution of the front.
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 7
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    Underway CTD data collected during METEOR cruise M131/1 (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: Conductivity; CTD, underway; CTD-Rapid Cast; CTD-RCST; CTD-UW; DATE/TIME; Event label; LATITUDE; LONGITUDE; M131; M131_1164-1; M131_1167-1; M131_1169-1; M131_1171-1; M131_1174-1; M131_1177-1; M131_1180-1; M131_1182-1; M131_1183-1; M131_1186-1; M131_1187-1; M131_1189-1; M131_1192-1; M131_1194-1; M131_1202-1; M131_1204-1; M131_1207-1; M131_1234-1; M131_1241-1; M131_1271-1; M131_1274-1; M131_1306-1; M131_1308-1; M131_1310-1; M131_1312-1; M131_1314-1; M131_1316-1; M131_1318-1; M131_1320-1; M131_1322-1; M131_1324-1; M131_1326-1; M131_1328-1; M131_1355-1; M131_1360-1; M131_1361-1; M131_1433-1; M131_1436-1; Meteor (1986); Pressure, water; Salinity; Sample code/label; Temperature, technical; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 1400106 data points
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  • 8
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    Microstructure measurements during METEOR cruise M136 (2018)
    PANGAEA
    Details
    Publication Date: 2024-06-25
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; DATE/TIME; DEPTH, water; Event label; LATITUDE; LONGITUDE; M136; M136_337-1; M136_340-1; M136_345-1; M136_347-1; M136_349-1; M136_352-1; M136_355-1; M136_357-1; M136_359-1; M136_361-1; M136_364-1; M136_373-1; M136_418-1; M136_419-1; M136_421-1; M136_434-1; M136_436-1; M136_438-1; M136_447-1; M136_449-1; M136_451-1; M136_462-1; M136_464-1; M136_479-1; M136_481-1; M136_489-1; M136_490-1; M136_506-1; M136_507-1; M136_509-1; M136_511-1; M136_518-1; M136_528-1; M136_529-1; M136_531-1; M136_537-1; M136_539-1; M136_541-1; M136_560-1; M136_575-1; M136_580-1; M136_582-1; M136_584-1; M136_586-1; Meteor (1986); Micro structure probe; MSS; Number; Pressure, water; Profile ID; Rate of turbulent kinetic energy dissipation; Salinity; SFB754; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 502017 data points
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  • 9
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    Underway CTD data collected during METEOR cruise M137 (2020)
    PANGAEA
    Details
    Publication Date: 2024-06-25
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; Conductivity; CTD, underway; CTD-UW; DATE/TIME; Event label; LATITUDE; LONGITUDE; M137; M137_602-1; M137_610-1; M137_618-1; M137_621-1; M137_628-1; M137_698-1; M137_706-1; M137_753-1; M137_786-1; M137_816-1; M137_829-1; M137_831-1; M137_851-1; M137_871-1; Meteor (1986); Pressure, water; Salinity; Sample code/label; SFB754; Temperature, technical; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 280302 data points
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  • 10
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    Underway CTD data collected during METEOR cruise M136 (2019)
    PANGAEA
    In:  GEOMAR - Helmholtz Centre for Ocean Research Kiel
    Details
    Publication Date: 2024-06-25
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD-Rapid Cast; CTD-RCST; DATE/TIME; Event label; File name; LATITUDE; LONGITUDE; M136; M136_335-1; M136_343-2; M136_363-1; M136_369-1; M136_376-1; M136_391-1; M136_407-1; M136_433-1; M136_478-1; M136_493-1; M136_496-1; M136_514-1; M136_536-1; M136_546-1; M136_552-1; M136_566-1; M136_571-1; M136_573-1; Meteor (1986); Pressure, water; Profile ID; Salinity; SFB754; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 416430 data points
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