What has Gabriel measured

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Water Temperature

  • The graph shows the temperature in the water at different depths over time.
  • Resolution of 0.001 ° C and accuracy of 0.01 ° C
  • Along with salinity, this tells us something about the density of the water.

Salt

  • Salt in dry form is a chemical compound consisting of several crystallized ions.
  • Salt comes in different forms and often occurs through chemical reactions.
  • The word salt is often synonymous with ione compound. Salt is often dissolved easily in water. The sea is naturally salty, with about 3.5% salt.
  • In oceanography, there is a tradition of expressing salinity not as a percentage, but in thousands of sums it is about the same as grams of salt per liter of seawater. The unit "psu" (practical salinity unit) is also used. Common salinity values for seawater and ocean water are 34-36.
  • The salinity together with the temperature determines the density of seawater.
  • The salinity of seawater is measured through conductivity. Conductivity is a property a substance has to conduct power. 
    By measuring the conductivity through the water, it is calculated how much salt is in the water.

Oxygen

  • Oxygen concentration – the sensor measures the amount of dissolved oxygen in the water.
  • The oxygen enters the water at the surface where the atmosphere is in contact with the water.
  • The uptake increases width turbulent activity, such as waves.
  • Oxygen level is greatest at the surface and this can give oceanographers information about for how long water has been at the surface.
  • Oxygen content in the water can also indicate how long a water mass has been left untouched, ie not renewed by mixing with other bodies of water.
  • This is because organisms (like bacteria) use the oxygen so that the oxygen concentration over time will decrease. In this way, the oxygen content can be a measure of the age of the water.
  • Because of this, oxygen is used as kind of "trace element" and characteristic of a particular water mass.
  • Measured in mg / l, but data shown is percent oxygen saturation.

Fluorescens

  • Fluorescence is a measure of radiated light from a substance that has absorbed radiation from, for example, the sun.
  • Fluorescence is a form of luminescence and is directly dependent on biological mass which has absorbed and then emitted radiation.
  • This gives us a measure of biological mass such as different types of plankton in the water. Measured in ug / l.

Turbidity

  • Turbidity is the cloudiness of the water and is caused by a large number of particles that are generally invisible to the naked eye, just like smoke in the air.
  • Turbidity is an important measure of water quality.
  • Increased cloudiness may come from biological particles such as plankton, sediment in the water, or other types of contamination such as dust or chemical particles.
  • Turbidity is measured in FTU (Formazin Turbidity Unit).

Air Temperature

Air temperature average

Dives / day