Discussion
The vertical (depth) profiles for three parameters P1, P2, and P3 in the northern Indian Ocean are given in the figure below. The values along the x-axis are the normalized values of the parameters and y-axis is the depth (m).
Identify the parameters P1, P2, and P3 from the options given below.
Answer: B
The parameters are P1: Nitrate; P2: Chlorophyll; P3: Dissolved Oxygen.
- P1 is near zero at the surface and increases steadily with depth. That is nitrate: phytoplankton use it up in the sunlit layer, and it is regenerated from sinking organic matter at depth.
- P2 has a sharp peak near 50 to 70 m and is low above and below. That is the deep chlorophyll maximum, where there is still enough light and the nitrate supply from below begins.
- P3 is highest at the surface and falls sharply to near zero below about 70 m. That is dissolved oxygen, high in the mixed layer through exchange with the air and photosynthesis. The northern Indian Ocean has an intense oxygen minimum zone just below it.
The other options give one of these shapes to the wrong variable, such as oxygen rising with depth or nitrate peaking below the surface.
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