The Journal of Glaciology is published as Gold Open Access with CC-BY licensing attribution 4.0 as default. There are other licencing attributions available.
If CC-BY is selected you are free to
Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material
For any purpose, even commercially
Under the following terms
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
Please note that permissions are still required for using material published in IGS publications prior to 2016 when the publications became Gold Open Access.
To request a permission letter please e-mail the IGS at igsoc@igsoc.org
Note: as the copyright is jointly vested with both the author and the International Glaciological Society, you should also seek permission from the respective author of the paper you quote.