Contributor Roles Taxonomy, CRediT, is now implemented for new submissions to AGU journals. I had a post on this a few months ago and it’s been in place with Water Resources Research for a year or so, but now it is implemented for all AGU journals, including JGR Space Physics. They have a page listing the various CRediT author roles but a much better description of them is in this Google doc. Here is the main chart from that document:
Corresponding authors, when submitting their manuscript through GEMS, now have the option to fill out these contributor roles for all coauthors on the paper. You don’t have to do it, at least not yet. Also, the current plan is to start displaying these contributor roles as part of the paper’s online information in January 2018, or whenever Wiley completes its software upgrade enabling display of these contributor role designations.
You don’t have to worry about the film credit model of authorship; that is not being implemented anytime soon. We will still have an ordered listing of authors, we will still be citing multi-authored papers by the first author’s last name, and all authors will still be getting full credit in their CVs and h-index calculations. This is just an extra layer of information about the study that will not only increase transparency about the contribution of each author to the study but also make corresponding authors aware of the different roles within a study and think about who should be an author of the eventual paper.