That is the approximate date the Northern Kingdom was taken into captivity by the Assyrians. Actually, the captivity took place in waves and was spread over a number of years, but that single date is most often cited as a reference point. How that evacuation of millions of people might tie in with tree rings seems obscure to me at this point.
I would speculate that 610 BC, when they escaped bondage and 5 Million headed north through the Caucasus Mountains to soon be discovered by history as The Celts might have a better chance at having a tie to a catyclism. Sort of like being sprung from prison following an earthquake???
You may be suprised. 2-3 Chinese dynasties collapsed concident with the tree ring 'event' dates. Okay, I don't see anything in the tree ring data for 722BC or 600BC. I will keep the dates in my mind and alert you if I come across anything centered around those dates.