A water sample from 3000 m depth has a O2 concentration of 100 µmol kg-1. The saturation O2 concentration, [O2sat], is determined from temperature and salinity to be 300 µmol kg-1. a) What is the Apparent Oxygen Utilization (AOU) of the water sample? (2 pts) b) Based on figure 8, is this water sample more likely to be from the Atlantic Ocean, or the Indian Ocean? (2 pts) Figure 8.pdf c) The water sample contains 30 µmol kg-1 dissolved inorganic nitrogen (DIN). Calculate the concentration of preformed DIN (use the following version of the Redfield equation for the ratio). (2 pts) d) What assumption is made about DIN during this calculation? (2 pts) e) Using this value, estimate the preformed dissolved inorganic phosphate (DIP) concentration. (2 pts)