By now, you know that these SOCCOM floats open incredible windows into a vitally important part of our climate system, the Southern Ocean, but how exactly do they do that? Let’s take a look. First off, there are the sensors. Here’s a photo of the top of one of the floats with the sensors labeled. To start, take a look at the temperature and salinity sensor. That’s the black tower that has the tall holes in it. Salinity is measured by measuring the water’s conductivity. If the water has higher conductivity, that means there are more ions in the water, which means a higher salinity. If you know the temperature and pressure, you can calculate an exact number for the salinity of the water from this device. The temperature probe is actually called a “thermistor” not a thermometer. The traditional mechanics of a thermometer use mercury, but a thermistor is actually a resistor (a metal, ceramic or polymer) whose resistance changes very precisely with temperature. Put thermo- and resistor toge...
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