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Current profile of subsea export cables

Sig
From the offshore substation, why would the current profile slope down towards the middle of the export cable then rise again at it's terminal end (onshore substation)? Is it because at both ends of the export cable, there is effectively a 'source'? One would have expected the current from one end to the other to have a linear drop off (heat and other losses).Wondering if charging current has a play into this also. 



See attached graph.



Thanks
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    I would expect the current to be constant all the way along, even with thermal losses.  The only way I can see it would be different is if substantial currents are leaking into the sea.


    I am assuming it's DC.  AC would be more prone to "losing" current by capacitive leakage across the insulation.
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    I would expect the current to be constant all the way along, even with thermal losses.  The only way I can see it would be different is if substantial currents are leaking into the sea.


    I am assuming it's DC.  AC would be more prone to "losing" current by capacitive leakage across the insulation.
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