Meanings of jarring dissonance in English

Occupy Wall Street brought that jarring dissonance into greater relief for Crabapple.

We were sincerely attached to each other in spite of the jarring dissonance of character.

We expect pleasing harmonies rather than jarring dissonance -but what sounds pleasing today may have seemed dissonant two hundred years ago.

But those images are at jarring dissonance with the strategies which some National MPs and party supporters clearly believe are still acceptable to National.