[A-OS21] Global ocean observation networks: Current status, results, re-assessments, and future perspectives

[AOS21-P03] Cold-core ring observation in the Kuroshio Extension region by shallow-water floats

*Akira Nagano¹, Minoru Kitamura¹, Kensuke Watari¹, Iwao Ueki¹ (1.JAMSTEC Japan Agency for Marine-Earth Science and Technology)

Keywords:cold-core ring, air-sea interaction, shallow-water float

In recent years, data of sea surface temperature, sea surface height, and so on collected by satellites and those of subsurface temperature and salinity profiles by Argo floats are essential for oceanographic studies. Despite of the development of these observation technologies, there are phenomena which are not sufficiently understood. Mesoscale eddies are one of such phenomena. There still remains much to be learned about their interior spatiotemporal structures and biogeochemical features. Accordingly, high-resolution and multiple-parameter observations are required to deeply understand mesoscale eddies. In this study, focusing on cyclonic mesoscale eddies detached from the Kuroshio Extension, i.e., cold-core rings (CCRs), we performed hydrographic observations with multipurpose observation floats (MOFs) and CTD/XCTD by the JAMSTEC R/V Mirai from November 2021 to January 2022 (MR21-06). MOFs are small and lightweight floats developed in JAMSTEC and are suitable for high-frequency collection of hydrographic profiles. We will report preliminary results of our MOF observations in CCRs and discuss observations to be performed in future.