Towards a broader perspective on ocean acidification research Introduction

Ocean acidification (OA) continues to be one of the most studied single topics in marine science. Almost 800 articles on OA appeared in 2016 alone. Forty-four of those were published in a special themed issue of the ICES Journal of Marine Science, "Towards a broader perspective on ocean acidification research." Submissions to that themed initiative continued well beyond the original deadline and were so numerous that we decided to publish this-a second OA-themed issue-which contains an additional 33 articles. In this Introduction, I briefly present the contributions that appear in this theme issue, and then offer an updated assessment of the status of OA research.