Question 1

Look at diagram below

A) Does this box model show the open ocean being in equilibrium state in relation to internal cycling, construct a flux balance for internal processes

B) Make a budget for the total silicon fluxes to the ocean, is the ocean equilibrium state in this box model

Question 2

Look at diagram below

A) what is the dominant source of N to surface waters in Eastern Mediterranaen

B) What form of N is probable to be part of atmospheric DON flux

C) calculate residence time of -> NO3 in Eastern Mediterranean Deep water

d) Calculate residence time of DON in the surface waters

e) Calculate residence time of total Nitrogen (NO3+PON+DON+NH3) in surface waters