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05.02.12: Nitrate versus depth of an isopycnal

Here, we have calculated the depth of and the nitrate along the isopycnal surface σ = 24.99 kg/m3. This surface is on average around 146 m depth over the domain chosen around station ALOHA (Fig. 1).

Fig. 1 shows a snapshot of the nitrate distribution on a particular day and Fig. 2 the depth of the surface on that same day. We see that there is not a linear relationship between depth and nitrate unlike in the float observations of nitrate. Instead, there are a few isolated mesoscale events with a strong nitrate content.

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Figure 1: Nitrate along the isopycnal surface σ = 24.99 kg/m3 in the OFES simulation on Sept. 29, 2004.

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Figure 2: Depth of the isopycnal surface σ = 24.99 kg/m3 in the OFES simulation on Sept. 29, 2004.

In consequence, the distribution of nitrate versus the depth of the isopycnal surface does not resemble the observed one (Fig. 3). This suggests that the model does not correctly reproduce the nitrate dynamics.

../../../../../../_images/ntr0_depth0_2004_2006.png

Figure 3: Nitrate versus depth of isopycnal surface σ = 24.99 kg/m3 in the OFES simulation over the domain of Fig. 1 and during 2004-2006.


See large_files/iso_analysis_sigma24_99_2004_06_Hawaii.mat in RESEARCH/PROJECTS/MARINE_BIOLOGY/SUBMESOSCALE_PROCESSES/OFES/ on ipu1.