Acknowledgments
We are grateful to Argo Program and MEOP project for significant
deployment efforts in Southern Ocean and successive QC processes. This
study was financially supported by JSPS KAKENHI Grant Numbers 21H04918.
We thank A. Kubokawa, and Y. Yoshikawa for their valuable comments and
B. Pena-Molino for providing the I9S mooring records. The authors
declare no competing interest.