How does one small area get isolated from the rest of the world? It is located immediately adjacent and downwind of Greenland, the only major extant ice sheet in the Northern Hemisphere. As Arctic amplification has worsened, the winds have shifted to where ^^^ is persisting for much longer for more of each year. As oceanic heat content also continues accumulating, the oceanic ridges are extending farther into the Arctic and acting as more persistent "blocks" that keep continental weather more segmented (i.e., Greenland airmasses have a harder time drifting directly across the Atlantic, and instead fall into Quebec and then leak across the ATL cool pool into Western Europe and North Africa).
I have seen you harp on a lack of data from other people and yet, you just wrote an entire piece of fan fiction with no data to back it up.
Unless you can show me that Lake Agassiz has somehow secretly been re-forming and holding back massive amount of glacial meltwater, your theory looks at an individual event without context. That's fine if you just postulated it once and waited for data (because all theories need a starting point) but to harp on it constantly as if it is an irrefutable truth that somehow the rest of the scientific community has been blind to, is frankly insulting, delusional and detracting from the actual good work being expounded on here.
Show me proof, show me comparisons, show me calculations that show the volume of fresh water required to significantly change the salinity of and slow the AMOC can be released in a sufficiently short period of time. Its the least you can do give how much time you have dedicated to this theory.
We have a problem, and it is perception.
What was Lake Agassiz? A large body of freshwater formed by ice melt. We do not know how much the outpouring was, but it certainly wasn't the entire lake. 10,000KM^3 would be generous (IMO) and a sudden release of 5,000KM^3 would be more realistic, but I think this is still high.
In 2018, we saw a sudden and extreme freshwater melt pulse in late April from the accumulated SWE balance, which at that time was approximately *double* normal values for late April. This released almost 1,000KM^3 of SWE in the span of a week into the NATL.
This was followed by a stall in loss, and another spurt in mid-June, as the "protective" freshwater lens was breached, allowing another rapid decline, which was followed by severely negative SST anomalies in the NATL.
If the situation in 2018 is capable of producing anomalies of -3/-4C in the NATL, and maintaining snowcover across much of Quebec over a month past normal melt-out (well into June), what happens when we only have 25-50% more SWE in late April vs. 2018?
The nature of melt, as shown by this year's behavior, is not gradual. It happens in pulses, which when sufficiently large enough, act to protect the remaining snowcover through forcing of -SSTAs / capping oceanic heat anomalies, which are the primary source of continental warm pulses.
This, I think, is why so many here have a problem believing my posts. They do not understand that the process is not linear. In order for re-glaciation to occur, snow needs to last into July, which then allows it to continue into August / September due to decreasing solar, and the higher insolation up at 90N vs. 55-65N, and the protective freshwater lens released by melting. And as we saw this year, melt occurs in pulses, and it does not really happen gradually (except in between pulses, when it slows considerably).
This means that we need enough accumulated SWE mass to survive the June melt pulse, as well as the July melt pulse. By late July / August, if enough extant snowcover is remaining across Quebec / etc, it is feasible that the sensible weather above / around will be kept cold enough by the remaining albedo anomalies that accumulation will begin occurring *much* earlier than it has historically, which means far less SWE than what one would normally think necessary for glaciation could be sufficient for survival through and beyond solstice and into the subsequent winter.
Here is SSTA from 7/7/2018. You can clearly see the footprint of the June melt pulse (and whatever residuals came before it). I do not know if we need 500KM^3 more accumulated SWE than 2018 had for Quebec's coverage to survive into July, or if it is 1,000KM^3, but I don't think the numbers are much higher than that, because what has already occurred this spring / summer has been immensely impactful to the NATL and sensible weather across much of the Canadian shield. We still have extant snowcover across portions of NE Quebec, and Foxe Basin and NE Hudson Bay have much more ice than normal.
Does this set the stage for an even more impressive resurgence of continental SWE in 2019? I am not sure. But I think we will see a worse repeat of this year's events within the next few years, and while that may be insufficient to yield re-glaciation, the one AFTER that could be the smoking gun.