I attach the graph of the projection of the September monthly average of volume given volume loss from now will be at the 10 year average (and volume gain in the 2nd half of September).
Note that this does not take account of the early July large sea ice extent reductions as the PIOMAS data is to June 30, and that's all we will get.
The Sept average volume projection is 4.22 thousand km3, some 230 km3 above the long-term linear trend (though less than the linear trend average of a yearly loss of 320 km3).
Because of the recent sea ice area and extent losses, my inclination guess is that this 4.22 thousand km3 is towrds the upper boundary, with a real possibility of a figure of around 4,000 km3 close to the linear trend. So my vote is 3.75 to 4.25 thousand km3.
But what do I know?
Poll