Assessing the secular variability of turbulent mixing in the Southern ocean ...

• Main Authors: Kitade, Yujiro, Naho, Kamogawa, Toshiyuki, Hibiya
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Southern Ocean
• Online Access: https://dx.doi.org/10.57757/iugg23-2357; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018400

<!--!introduction!--> The Southern Ocean is a huge reservoir of negative heat and substances such as CO 2 , and plays a key role in global climate change. Turbulent mixing is thought to be responsible for changes in the physical circulation field, such as the recently discovered shallowing of the meridional circulation in the Southern Ocean (Shimada et al., 2022), in addition to its contribution to the biological system, such as the supply of nutrients. We analyze CTD data collected by the T/V Umitaka Maru along the 110°E longitude of the Southern Ocean over a period of 10 years (from 2011 to 2020) and turbulence data collected by the VMP-5500 in 2016, and investigate the distribution and variability of vertical mixing. We characterize various turbulence parameters by applying the method of Galbraith and Kelly (1996) as well as the method of Gargett and Garner (2008) to the density inversion of the CTD data and deriving the calibration coefficients from the VMP-5500 data. Based on the obtained ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...