AGU journals now offer authors the opportunity to make their articles open for others to read for free. Authors choosing this option pay a fee based on article length and number of figures; these charges are designed to offset the potential loss of subscription income. This new option, called Author Choice, provides · Unlimited access to the article for all readers from the moment of publication. · Permission to deposit the PDF version in institutional repositories so long as the repository accepts AGU copyright permissions. · Continued copyright protection to prevent unauthorized uses of the author's work.