As a result, we do not observe an abrupt decease of the volume transport at a certain depth, but a gradual decrease instead (see Figures 7 and 8). The model results described above showed that the main transport of phosphorus into PF-562271 the upper 10-m layer was from depths less than 30 m for the upwelling along both coasts, whereas for nitrogen transport it was from layers deeper than 40 m. This is explained by the difference of nutricline depths and shape: there is a remarkable increase in nitrate concentration starting from 40 m depth, whereas for phosphate

there is no such increase (Laanemets et al. 2004). Along the southern coast, where the depths are greater, nitrogen is more easily transported to the surface than off the northern coast, where the seabed is shallower and the amount of nitrogen in the offshore water

column is correspondingly lower. The total amounts of nutrients transported to the surface are larger during the upwelling along the southern coast. Laanemets et al. (2009) explained these larger amounts by the shorter distance that water particles carrying nutrients have to cover in order to reach the surface. Lips et al. (2009) showed that during the upwelling event along the southern coast, observed during the summer 2006 measuring campaign, 85% of the upwelled water was from the intermediate layer and the remaining 15% from the surface layer. The plots of the ratios of depth-accumulated amounts MS 275 of nutrients transported to the upper 10-m layer in the Gulf from a depth range [75 m – given depth z] to the total amount of nutrients transported to the surface ( Figure 9) show that for the northern coast the main phosphorus transport is confined within Tacrolimus (FK506) the upper 40-m layer: 95% of nutrients are transported from there ( Figure 9a). During the upwelling along the southern coast 95% of

phosphorus was transported from the upper 55-m layer and 85% from the upper 40-m layer ( Figure 9c). On the other hand, the behaviour of nitrogen was different: 95% of the nitrogen found in the upper 10-m layer by day 6 came from depths shallower than 55 m off the northern ( Figure 9b) and 65 m off the southern coast ( Figure 9d). 40% of the surface layer nitrogen was from depths shallower than 33 m and 45 m for the northern and the southern coasts respectively. Simulations showed that off the southern coast the upwelled water was transported to the surface mostly from the intermediate layer, as suggested by Lips et al. (2009), whereas off the northern coast transport from the shallower layers has a larger impact. The intensity of nutrient transport from the middle layers was greater during the upwelling along the southern coast for the same wind forcing magnitude, because the water from the depths of 35–45 m reached the surface layer more quickly, at least in the course of one day (Figure 7, cf.