Evidence for large-scale climate forcing of dense shelf water variability in the Ross Sea.

Autor: Zhang Z; Key Laboratory of Polar Ecosystem and Climate Change, Ministry of Education and School of Oceanography, Shanghai Jiao Tong University, Shanghai, China. zrzhang@sjtu.edu.cn.; Shanghai Key Laboratory of Polar Life and Environment Sciences, Shanghai Jiao Tong University, Shanghai, China. zrzhang@sjtu.edu.cn.; Shanghai Frontiers Science Center of Polar Science, Shanghai Jiao Tong University, Shanghai, China. zrzhang@sjtu.edu.cn.; Key Laboratory for Polar Science, Polar Research Institute of China, Ministry of Natural Resources, Shanghai, China. zrzhang@sjtu.edu.cn., Xie C; Key Laboratory of Polar Ecosystem and Climate Change, Ministry of Education and School of Oceanography, Shanghai Jiao Tong University, Shanghai, China., Castagno P; Department of Mathematical Sciences and Informatics, Physics and Earth Sciences, University of Messina, Messina, Italy., England MH; Centre for Marine Science and Innovation (CMSI) and Australian Centre for Excellence in Antarctic Science, University of New South Wales, Sydney, NSW, Australia., Wang X; Key Laboratory of Polar Ecosystem and Climate Change, Ministry of Education and School of Oceanography, Shanghai Jiao Tong University, Shanghai, China., Dinniman MS; Center for Coastal Physical Oceanography, Old Dominion University, Norfolk, VA, USA., Silvano A; Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton, UK., Wang C; Key Laboratory of Polar Ecosystem and Climate Change, Ministry of Education and School of Oceanography, Shanghai Jiao Tong University, Shanghai, China., Zhou L; Key Laboratory of Polar Ecosystem and Climate Change, Ministry of Education and School of Oceanography, Shanghai Jiao Tong University, Shanghai, China., Li X; Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China., Zhou M; Key Laboratory of Polar Ecosystem and Climate Change, Ministry of Education and School of Oceanography, Shanghai Jiao Tong University, Shanghai, China.; Shanghai Key Laboratory of Polar Life and Environment Sciences, Shanghai Jiao Tong University, Shanghai, China.; Shanghai Frontiers Science Center of Polar Science, Shanghai Jiao Tong University, Shanghai, China.; Key Laboratory for Polar Science, Polar Research Institute of China, Ministry of Natural Resources, Shanghai, China., Budillon G; Department of Sciences and Technologies, Parthenope University, Naples, Italy.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Sep 18; Vol. 15 (1), pp. 8190. Date of Electronic Publication: 2024 Sep 18.
DOI: 10.1038/s41467-024-52524-x
Abstrakt: Antarctic Bottom Water (AABW), which supplies the lower limb of the thermohaline circulation, originates from dense shelf water (DSW) forming in Antarctic polynyas. Here, combining a long mooring record of DSW measurements with numerical simulations and satellite data, we show that significant correlation exists between interannual variability of DSW production in the Ross Sea polynyas, where DSW contributes between 20-40% of the global AABW production, and the Southern Annular Mode (SAM). The correlation is largest when the Amundsen Sea Low (ASL) is weakened and shifted east of the Ross Sea. During positive SAM phases, enhanced offshore winds and lower air temperatures over the western Ross Sea increase sea ice production and promote DSW formation, with the opposite response during negative SAM phases. These processes ultimately modulate AABW thickness in the open ocean. A projected positive shift of the SAM and eastward displacement of the ASL thus has implications for the future of DSW and AABW formation.
(© 2024. The Author(s).)
Databáze: MEDLINE
Externí odkaz: