A new dissolved oxygen sensor for marine application was developed and first tests in the field were carried out. The sensor uses a micro-electrode as the sensing element that has an inherently fast response and an increased resistance to... more
A new dissolved oxygen sensor for marine application was developed and first tests in the field were carried out. The sensor uses a micro-electrode as the sensing element that has an inherently fast response and an increased resistance to bio-fouling due to the properties of the electrode material, platinum, and the employed operation regime. Introduction of a cleaning cycle, where
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30 years of temporal variability of temperature and currents below the main thermocline between 1980–2009 in the subtropical Northeast Atlantic (Kiel 276, 33<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e2498" altimg="si96.svg"><mml:msup><mml:mrow /><mml:mrow><mm...more
Abstract Data from the deep-sea mooring Kiel 276 (33 ∘ N, 22 ∘ W), 5300 m water depth in the northeast Atlantic, was used to investigate the temporal variability of temperature and currents below the main thermocline (1000 m, 1600 m,... more
Abstract Data from the deep-sea mooring Kiel 276 (33 ∘ N, 22 ∘ W), 5300 m water depth in the northeast Atlantic, was used to investigate the temporal variability of temperature and currents below the main thermocline (1000 m, 1600 m, 3000 m, 5000 m) in the 30-year period (between 1980 and 2009). Daily averages were the basis to assess the temperature and currents changes, as well as kinetic energy, from annual to decadal and long-term scales. Below the main thermocline, no seasonal signal was identified for both, temperature and currents, during the 30 years. The record-length linear temperature trends at 1000 m and 1600 m are 0.03 ± 0.01 °C year−1 and 0.02 ± 0.02 °C year−1, respectively. The mean currents also intensified within the decades in the entire water column, and as a consequence, the mean kinetic energy increased. The fluctuating kinetic energy increased on a decadal scale only at 1000 m, as a possible consequence of the increase in the strength of Mediterranean Water lenses (MEDDIES) that crossed the mooring site. During the period 2001–2009, six MEDDIES crossed the Kiel 276 site, in addition to the 10 MEDDIES identified earlier during the previous 20 years, between 1980 and 2000 (Siedler et al., 2005). The integral time scales are of the same order in all depths (between 30 to 40 days), indicating that events occur on similar time scales, with mesoscale signals dominating and being present within the entire water column.
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... in an amalgam in the reduction step and then reoxidised to generate the signal), or square wave cathodic sweep voltammetry (without the ... of the analyte(s). Arrays of microelectrodes can also be used to investigate variations on... more
... in an amalgam in the reduction step and then reoxidised to generate the signal), or square wave cathodic sweep voltammetry (without the ... of the analyte(s). Arrays of microelectrodes can also be used to investigate variations on small spatial scales by monitoring the currents of ...
Research Interests: Geochemistry, Oceanography, Chemistry, Technology, Time Series, and 14 moreMass Spectrometry, Raman Spectroscopy, Sensors, Quality Assurance, Sampling methods, Marine chemistry, In situ, Seawater, Spatial resolution, Boolean Satisfiability, Aromatic Hydrocarbon, Volatile organic compound, Commercial Off-The-Shelf, and Optical Absorption
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Research Interests: Environmental Science, Geochemistry, Oceanography, Time Series, Seasonality, and 13 moreProduction economics, North Atlantic, Sediment Traps, Primary Production, Deep water, Particulate organic carbon, Calcium Carbonate, Deep Sea, Interannual Variability, Chlorophyll a, Northeast Atlantic, ecosystem model, and Mixed Layer Depth(MLD)
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The instrument presented, named SUV-6, uses the well-known method of UV-absorption measurement for the determination of nitrate concentrations in seawater. To account for the presence of other constituents that show absorption in the UV... more
The instrument presented, named SUV-6, uses the well-known method of UV-absorption measurement for the determination of nitrate concentrations in seawater. To account for the presence of other constituents that show absorption in the UV portion of the light spectrum (e.g. bromide and bisulfite) the absorption is measured in six wavelength bands from 205 nm to 280 nm. While the original
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Nitrate and H2S concentrations were measured in 31 water samples from 4 CTD Stations in the North Atlantic and 234 water samples from all basins of the Baltic Sea, using standard wet chemical laboratory methods in parallel with a... more
Nitrate and H2S concentrations were measured in 31 water samples from 4 CTD Stations in the North Atlantic and 234 water samples from all basins of the Baltic Sea, using standard wet chemical laboratory methods in parallel with a commercial in situ absorption spectrometer. The parameters for fitting the absorption spectra to sets of calibration spectra were optimized as a preparation to use the commercial instrument in situ.
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. Paleoreconstructions suggest that during the Last Glacial Maximum (LGM) the North Atlantic circulation was noticeably different from its present state. However, the glacial salt conveyor belt is believed to be similar to the... more
. Paleoreconstructions suggest that during the Last Glacial Maximum (LGM) the North Atlantic circulation was noticeably different from its present state. However, the glacial salt conveyor belt is believed to be similar to the present-day's conveyor, albeit weaker and shallower because of an increased freshwater flux in high-latitudes. We present here the investigation of the conveyor operation based on ocean circulation modelling using two numerical models in parallel. The GFDL primitive equation model and a planetary geostrophic model are employed to address the problem of the paleocirculation modelling in cases of uncertain and sparse data comprising the glacial surface boundary conditions. The role of different simplifications that may be used in the ocean climate studies, including the role of grid resolution, bottom topography, coast-line, etc., versus glacial-interglacial changes of the ocean surface climatology is considered. The LGM reverse conveyor gyre appeared to be the most noticeable feature of the glacial-to-interglacial alteration of the ocean circulation. The reversed upper-ocean conveyor, weaker and subducting 'normal' conveyor in the intermediate depths, and the change of the deep-ocean return flow route are robust signatures of the glacial North Atlantic climate. The results are found to be 'model-independent' and fairly insensitive to all factors other than the onset of the glacial surface conditions.
Research Interests: Geology, Geophysics, Oceanography, Physics, Climatology, and 13 moreNorth Atlantic Ocean, Atmospheric sciences, Numerical Simulation, Salinity, North Atlantic, Ocean Circulation, Thermohaline Circulation, Last Glacial Maximum, Interglacial, Sparse Data, Numerical Model, Boundary Condition, and present day
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A new dissolved oxygen sensor for marine application was developed and first tests in the field were carried out. The sensor uses a micro-electrode as the sensing element that has an inherently fast response and an increased resistance to... more
A new dissolved oxygen sensor for marine application was developed and first tests in the field were carried out. The sensor uses a micro-electrode as the sensing element that has an inherently fast response and an increased resistance to bio-fouling due to the properties of the electrode material, platinum, and the employed operation regime. Introduction of a cleaning cycle, where
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A laboratory model of a short pathlength transmissometer with an in situ calibration facility was built to demonstrate the feasibility of high precision attenuation coefficient measurements at short pathlength even in clear waters. The... more
A laboratory model of a short pathlength transmissometer with an in situ calibration facility was built to demonstrate the feasibility of high precision attenuation coefficient measurements at short pathlength even in clear waters. The high precision is enabled by the in situ calibration by variation of pathlength which is needed to overcome errors introduced by various sources such as window
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A new dissolved oxygen (DO) sensor for marine application was developed and first tests in the field were carried out. The sensor uses a mesoporous microelectrode as the sensing element that has an inherently fast response and an... more
A new dissolved oxygen (DO) sensor for marine application was developed and first tests in the field were carried out. The sensor uses a mesoporous microelectrode as the sensing element that has an inherently fast response and an increased resistivity to bio-fouling due to the properties of the electrode material, mesoporous platinum. Introduction of a cleaning cycle, where the potential
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The Gotland Deep Environmental Sampling Station (GODESS) in the Eastern Gotland Basin of the Baltic Sea is a profiling mooring taking profiling measurements with an interdisciplinary suite of sensors. Profiles are taken between 180 m and... more
The Gotland Deep Environmental Sampling Station (GODESS) in the Eastern Gotland Basin of the Baltic Sea is a profiling mooring taking profiling measurements with an interdisciplinary suite of sensors. Profiles are taken between 180 m and 30 m depth through the redoxcline that is typical in the deep basins of the Baltic Sea. The profiling mooring allows to take multiple profiles over extended times (e.g. two daily profiles over a time of three months) and therefore enables investigations of the dynamics of the redoxcline on timescales not accessible by ship based investigations.
Research Interests: Geology, Oceanography, Acoustics, Sensors, Mooring, and 5 moreSeawater, Baltic Sea, OCEANS Conference, Payloads, and Suite
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Underway physical oceanography and meteorological data were collected during the SO269 expedition (August, 3rd – August, 24th), on-board of the German R/V Sonne. The SO269 expedition was carried out in the frame of the project South China... more
Underway physical oceanography and meteorological data were collected during the SO269 expedition (August, 3rd – August, 24th), on-board of the German R/V Sonne. The SO269 expedition was carried out in the frame of the project South China Sea – natural laboratory under climatic and human induced stress. Physical oceanography (temperature, salinity, chlorophyll a, turbidity, depth, conductivity, and sound velocity) together with the meteorological (air temperature, pressure, humidity, wind speed and wind direction) are of one-minute resolution.
This dataset provides 131 CTD profiles measured on board of the German R/V Sonne (cruise SO269) in the northern South China Sea, under the project SOCLIS – South China Sea Natural Laboratory under Climatic and Anthropogenic Stress, in... more
This dataset provides 131 CTD profiles measured on board of the German R/V Sonne (cruise SO269) in the northern South China Sea, under the project SOCLIS – South China Sea Natural Laboratory under Climatic and Anthropogenic Stress, in August and September 2019. The 131 profiles of temperature, salinity, dissolved oxygen, fluorescence, turbidity, surface irradiance (SPAR) and Photosynthetically active radiation (PAR), and sound velocity were measured using a CTD Sea-Bird SBE 911 plus, together with oxygen sensor (SBE 43), PAR sensor (Biospherical, QCP-2350 + QSR-2200), and a fluorometer (WET Labs ECO-FLNTU(RT)D). Additionally, oxygen saturation, potential temperature and sigma-theta (with reference to the surface) were calculated. The 131 CTD profiles are distributed by 81 stations and aim to study the impact of a growing anthropogenic pressure around the Pearl River Estuary into the northern shelf of the South China Sea towards the deep sea. The dataset was used to study the presenc...
This dataset provides 37 CTD profiles measured on board of the German R/V Sonne (cruise SO269) in the northern South China Sea, under the project SOCLIS – South China Sea Natural Laboratory under Climatic and Anthropogenic Stress, in... more
This dataset provides 37 CTD profiles measured on board of the German R/V Sonne (cruise SO269) in the northern South China Sea, under the project SOCLIS – South China Sea Natural Laboratory under Climatic and Anthropogenic Stress, in August and September 2019. The 37 profiles of temperature, salinity, dissolved oxygen, fluorescence, turbidity, surface irradiance (SPAR) and Photosynthetically active radiation (PAR), and sound velocity were measured using a CTD Sea-Bird SBE 911 plus, together with oxygen sensor (SBE 43), PAR sensor (Biospherical, QCP-2350 + QSR-2200), and a fluorometer (WET Labs ECO-FLNTU(RT)D). Additionally, dissolved oxygen, potential temperature and sigma-theta (with reference to the surface) were calculated. The 37 additional CTD files complement the physical oceanography dataset (Waniek et al., 2021).
BONUS BLUE BALTIC: Verbundprojekt: BONUS-SEAMOUNT – Neue Technologien zu Unterwasserüberwachungen und ihre Anwendung auf submarine Grundwasseraustritte und den Meeresboden; Vorhaben: SEAMOUNT-SISI – wissenschaftliche Instrumentierung der SEAMOUNT Infrastruktur : Schlussbericht : Laufzeit des Vorh...more
This dataset provides 37 CTD profiles measured on board of the German R/V Sonne (cruise SO269) in the northern South China Sea, under the project SOCLIS – South China Sea Natural Laboratory under Climatic and Anthropogenic Stress, in... more
This dataset provides 37 CTD profiles measured on board of the German R/V Sonne (cruise SO269) in the northern South China Sea, under the project SOCLIS – South China Sea Natural Laboratory under Climatic and Anthropogenic Stress, in August and September 2019. The 37 profiles of temperature, salinity, dissolved oxygen, fluorescence, turbidity, surface irradiance (SPAR) and Photosynthetically active radiation (PAR), and sound velocity were measured using a CTD Sea-Bird SBE 911 plus, together with oxygen sensor (SBE 43), PAR sensor (Biospherical, QCP-2350 + QSR-2200), and a fluorometer (WET Labs ECO-FLNTU(RT)D). Additionally, dissolved oxygen, potential temperature and sigma-theta (with reference to the surface) were calculated. The 37 additional CTD files complement the physical oceanography dataset (Waniek et al., 2021).
BONUS BLUE BALTIC: Verbundprojekt: BONUS-SEAMOUNT – Neue Technologien zu Unterwasserüberwachungen und ihre Anwendung auf submarine Grundwasseraustritte und den Meeresboden; Vorhaben: SEAMOUNT-SISI – wissenschaftliche Instrumentierung der SEAMOUNT Infrastruktur : Schlussbericht : Laufzeit des Vorh...more
This note describes a profiling mooring with an interdisciplinary suite of sensors taking profiles between 180 m and 30 m depth. It consists of an underwater winch, moored below 180 m depth and a profiling instrumentation platform. In its... more
This note describes a profiling mooring with an interdisciplinary suite of sensors taking profiles between 180 m and 30 m depth. It consists of an underwater winch, moored below 180 m depth and a profiling instrumentation platform. In its described setup it can take about 200 profiles at pre–programmed times or intervals with one set of batteries. This allows studies over an extended period of time (e.g. two daily profiles over a time of three months). The Gotland Deep Environmental Sampling Station (GODESS) in the Eastern Gotland Basin of the Baltic Sea is aimed at investigations of redoxcline dynamics. 5 The described system can be readily adapted to other research foci by changing the profiling instrumentation platform and its payload.
The authors present a straightforward description of their moored winch system designed to autonomously collect multiple profiles of water properties in the Baltic Sea over time periods of several weeks to months along with the results... more
The authors present a straightforward description of their moored winch system designed to autonomously collect multiple profiles of water properties in the Baltic Sea over time periods of several weeks to months along with the results from 3 test deployments. The GODESS system represents an integration of several commerciallyavailable components plus some adaptations for the specific measurement site. The paper’s introduction makes note of previous "wire-following" moored profiling instruments, but fails to review past (and current) moored winch systems. There are in fact many of these (both commercially-available and "home-built"). It seems to me that the
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. Paleoreconstructions suggest that during the Last Glacial Maximum (LGM) the North Atlantic circulation was noticeably different from its present state. However, the glacial salt conveyor belt is believed to be similar to the... more
. Paleoreconstructions suggest that during the Last Glacial Maximum (LGM) the North Atlantic circulation was noticeably different from its present state. However, the glacial salt conveyor belt is believed to be similar to the present-day&amp;amp;amp;amp;amp;amp;#39;s conveyor, albeit weaker and shallower because of an increased freshwater flux in high-latitudes. We present here the investigation of the conveyor operation based on ocean circulation modelling using two numerical models in parallel. The GFDL primitive equation model and a planetary geostrophic model are employed to address the problem of the paleocirculation modelling in cases of uncertain and sparse data comprising the glacial surface boundary conditions. The role of different simplifications that may be used in the ocean climate studies, including the role of grid resolution, bottom topography, coast-line, etc., versus glacial-interglacial changes of the ocean surface climatology is considered. The LGM reverse conveyor gyre appeared to be the most noticeable feature of the glacial-to-interglacial alteration of the ocean circulation. The reversed upper-ocean conveyor, weaker and subducting &amp;amp;amp;amp;amp;amp;#39;normal&amp;amp;amp;amp;amp;amp;#39; conveyor in the intermediate depths, and the change of the deep-ocean return flow route are robust signatures of the glacial North Atlantic climate. The results are found to be &amp;amp;amp;amp;amp;amp;#39;model-independent&amp;amp;amp;amp;amp;amp;#39; and fairly insensitive to all factors other than the onset of the glacial surface conditions.
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Dates of Cruise: from 18.10.2015 to 02.11.2015 - Areas of Research: Physical Oceanography, Geochemistry, Microbiology - Port Calls: Rostock (Germany), Rostock (Germany)