| A nitrogen based, pelagic ecosystem model has been coupled with an eddy-permitting ocean general circulation model of the Arabian Sea. The seasonal variability simulated by the model is in good agreement with observations: during the southwest monsoon (SWM) season, phytoplankton increases in the western Arabian Sea due to upwelling along the coast; during the northeast monsoon season, phytoplankton abundance is large in the northern Arabian Sea because of the enhanced nitrate entrained by relatively deep vertical mixing. The mechanism to maintain the high surface chlorophyll in the western Arabian Sea during the SWM season is investigated with the model. Using a set of artificial tracers, it is revealed that horizontal transport of nutrient subsequent to the coastal upwelling is by far more important than the open ocean upwelling due to the Ekman pumping. The horizontal transport can be classified into three processes, the Ekman transport, transport by the large-scale circulation and that by the mesoscale currents. In the model, the first has only a minor effect within the area of high chlorophyll while the latter two have comparable contributions. Considering the fact that simulated eddy activity is still less than observed by satellites, it may be possible to make the model results more realistic by assimilating sea-surface height data or running a finer resolution model. |
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