Random Alert Sound on MacBook Air

Since updating to Sequoia 15.0 my MacBook Air, it has been eliciting this odd alert click/beep every ten or fifteen minutes. And I can't for the life of me figure out why. There are no visible alerts; nothing on my iPhone or Apple Watch. I opened my Console and it does not appear to correspond with any system.log entries. It is annoying and a bit disconcerting.

Any help would be appreciated; I would love to associate this sound with *something*.