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  • 1
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    MKIIIB-CTD: improving its system output (1995)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 42 (11-12). pp. 2113-2126.
    Details
    Publication Date: 2017-07-10
    Description: In the Neil Brown Instruments' MKIIIB-CTD (conductivity-temperature-depth profiler), the system's digital outputs for the three basic measurements of temperature, conductivity and pressure typically show some small amplitude deviations from smooth calibrations which should be corrected for to achieve high accuracies, as required, e.g. within the Hydrographic Program (WHP) of the current World Ocean Circulation Experiment (WOCE). These deviations show up as (i) a strong nonlinearity or even discontinuity of several mK close to 0°C in temperature output leading to too high subzero temperatures; (ii) a jump of order 0.002 mS cm−1 in conductivity output when passing the half-range value 32.768 mS cm−1, which causes jumps in the relation of potential temperature and salinity; and (iii) errors in pressure measurements of up to 4 dbar due to mechanical hysteresis and both static and dynamic responses to temperature changes. The existence of these effects is demonstrated, and methods to reduce the associated errors are suggested.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0637(95)00078-X
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Long-term changes in the thermocline of the subtropical Northeast Atlantic (33°N, 22°W) (2013)
    Elsevier
    In:  Progress in Oceanography, 116 . pp. 246-260.
    Details
    Publication Date: 2016-10-04
    Description: Highlights: • Unique data set of daily temperature and current measurements over almost 30 years. • Cooling of the thermocline in the 1980s and extensive warming in the 2000s. • Currents indicate northward displacement of N-Atlantic subtropical Gyre in 1990s. • Influence of NAO and ENSO on current regime even in 500 m water depth. Data from almost thirty years of time series observations from a deep-sea mooring Kiel276 (33°N, 22°W), which was operated in the northeast Atlantic Ocean between 1980 and 2009, are studied to reveal information on the long term changes in the upper thermocline. This includes daily records of temperature and currents at two depths (240 m and 500 m). Until 1988, our analysis shows decreasing temperature in the entire thermocline followed by a slight increase at both depths; from 2000 on, extensive warming began at the shallower depth (240 m) and eight years later at the deeper (500 m) level. A northward displacement of the North Atlantic Subtropical Gyre is indicated by both current measurements and calculated kinetic energy between 1991 and 1998 resulting in an altered current regime in terms of absolute velocity and current directions in the last ten years compared to the first twenty years. Coherences of the currents with large scale climatic patterns such as North Atlantic Oscillation and El Niño/ Southern Oscillation evidence the atmospheric impact even at 500 m water depth.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.pocean.2013.07.004
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Observation of regeneration of nitrate, phosphate and silicate during upwelling off Ubatuba, Brazil, 23°S (1998)
    Elsevier
    In:  Continental Shelf Research, 18 . pp. 915-922.
    Details
    Publication Date: 2016-09-21
    Description: Off the Brazilian coast near Ubatuba, an upwelling event of South Atlantic Central Water (SACW) has been observed that transfer nutrient-rich water from 300 to 400 m depth onto the continental shelf to depths less than 35 m. Earlier work showed that SACW is present on the shelf quite frequently; however, nutrient data as natural tracers of water masses, are largely undocumented so far. During the upwelling process the water advanced over the shelf increasing its nutrients concentrations and depleting its content of dissolved oxygen due to the regeneration process. The ratios of regeneration relative to their open ocean origin amount to 4.6 mu M for nitrate, 0.43 mu M for phosphate and 5.7 mu M for silicate on average, while the dissolved oxygen depletes by 114.9 mu M,
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0278-4343(98)00002-8
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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