Can we do it?

To fly the glider we have to fly in a specific density range. The glider is ballasted for this density range and we have +/- 4 kg/m3 range. Since we found the temperature and salinity range at the 4 locations along our potential path we can use a calculation to find the density.

We used 2 different density calculators to assure that there is some accuracy: http://www.csgnetwork.com/h2odenscalc.html and http://www.earthwardconsulting.com/density_calculator.htm

To work off our last blog post: http://www.i-cool.org/?cat=76

The salinity and temperature ranges from:

Site 1:

Salinity: 35-35.25

Temp: 5-7C

Max Density: 1027.899 kg/m3

Min Density: 1027.445 kg/m3

Site 2:

Salinity:34.9-35.1

Temp: 3.5-7C

Max Density: 1027.445 kg/m3

Min Density: 1027.366 kg/m3

Site 3:

Salinity: 34.9-35

Temp:4-7C

Max Density: 1027.812 kg/m3

Min Density: 1027.366 kg/m3

Site 4:

Salinity: 35.2-36.6

Temp: 5-18C

Max Density: 1028.970 kg/m3

Min Density: 1025.454 kg/m3

The Maximum Value of density is 1028.970 kg/m3 and the Minimum Value is 1025.454 kg/m3 so the difference is 3.51600 kg/m3 which means we are within our +/- 4.oo kg/m3 range. We will check other sources to see if we can find a larger density range but our group feels that the mission is a go as planned. If we ballast the glider in the middle of these ranges we will have a +/- 1.758 kg/m3 range which is within out +/- 4.00 kg/m3 range.The next thing we are going to do is keep an eye out for larger temperature and salinity ranges and we want to make sure we are doing our math correctly so we know the data is accurate. Also, we will look around Site 4 more because this is where we see our highest and lowest density ranges. Possible reasons for the salty water could be the high outflow of spicy water from the Mediterranean Sea and once you go deep the water becomes cold so the combination of cold and salty water makes it dense and the warm and less salty water makes it less dense.

Chris Filosa, Abe Gelb, and Dakota Hahn

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