Changes in antarctic bottom water off the Wilkes land coast in the Australian-antarctic basin ...

• Main Author: Kobayashi, Taiyo
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Antarctic; Australian Antarctic Basin; Australian-Antarctic Basin; East Antarctica; Wilkes Land; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.57757/iugg23-1143; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017464

<!--!introduction!--> Long-term changes in Antarctic Bottom Water (AABW) off the Wilkes Land coast, East Antarctica, were investigated using historical hydrographic surveys and data from Deep Argo floats. Since the 1980s at the latest, AABW has contracted by approximately 11–14 m yr -1 and undergone isothermal freshening by approximately –0.6 × 10 -3 yr -1 . The contraction and freshening of AABW has accelerated in recent decades, with the former being led by the latter. The contraction of AABW was mainly derived from thinning of the denser layers of AABW, which was compensated for by thickening of the upper AABW. This contrast between excessive thinning and compensative thickening has strengthened gradually over time, suggesting that the meridional overturning circulation driven by AABW formation has weakened in the Australian-Antarctic Basin. Dissolved oxygen in AABW appears to have remained constant for approximately 50 years, except for the possibility of some oxygenation after 2000, which was not ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...