So that is back to back big drops on Home brew in area.
You use amsr2 channel 89ghz.
Of course I use the Uni Hamburg sea ice concentration product, that is using that channel.
Of course your products are very high res and much more precise then the SSMIS 91ghz products.
I am not sure what products you mean. Neither NSIDC, CT or Jaxa is using that channel.
Further there may some misunderstandings or not, but let me clarify:
Resolution has little influence on
Area, more on
Extent. Think of it, with infinitesimal grid cell sizes, extent and (true) area must be equal.
So if area is not really influenced by resolution, is heavily depending on algorithms (and therefore channels, there is a one-to-one relationship). Around this time of year CT (using NT, NASA Team algorithm) is measuring area below the true values, more than other algorithms.
(melt ponds affect all algorithms, but the effect with NT is exaggerated by its sensitivity for surface conditions) .
So yes, if "home brew" has a big drop, you can expect at least the same drop on CT two days later.
Last, "false ice" is mostly low concentration (~15% concentration). The effect on extent is far bigger than on area.