Physical Oceanography, Fall 2015
Problem 2. Due September 10
1) Using the equation of state (equation 2.1) in Knauss,
A) Calculate sigma for T = 10ºC,Salinity = 35 at the sea surface (0 db), and label this point A
on the figure below.
B) Calculate sigma for T = 15ºC, Salinity = 34 at the sea surface (0 db), and label this point B
on the figure below.
C) Calculate sigma for T = 35ºC, Salinity = 26 at the sea surface (0 db), and label this point C
on the figure below.
2) Make a table with three rows corresponding to points A, B and C. In each row, insert
three densities in sigma units, the first from your answer to question 1 above, the second the
value of sigma using the more accurate UNESCO * empirical density calculator, and the
third based on estimating from the location of the points on the graph below.
3.Comment on how the values of density in your table differ and why some are more similar
than others.
4) Using equation 2.1 in Knauss, determine how much salinity has to change to produce the
same decrease in density as a temperature increase of 10ºC.