Controls of topographic Rossby wave properties and downslope transport in dense overflows ...

• Main Authors: Han, Xianxian, Wang, Zhaomin
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Antarctic; The Antarctic; Antarc*
• Online Access: https://dx.doi.org/10.57757/iugg23-0330; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016134

<!--!introduction!--> Antarctic Bottom Water is primarily formed via overflows of dense shelf water (DSW) around the Antarctic continental margins. The dynamics of these overflows therefore influence the global abyssal stratification and circulation. Previous studies indicate that dense overflows can be unstable, energizing Topographic Rossby Waves (TRW) over the continental slope. However, it remains unclear how the wavelength and frequency of the TRWs are related to the properties of the overflowing DSW and other environmental conditions, and how the TRW properties influence the downslope transport of DSW. This study uses idealized high-resolution numerical simulations to investigate the dynamics of overflow-forced TRWs and the associated downslope transport of DSW. It is shown that the propagation of TRWs is constrained by the geostrophic along-slope flow speed of the DSW and by the dynamics of linear plane waves, allowing the wavelength and frequency of the waves to be predicted a priori . The rate ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...