On the outflow of dense water from the Weddell and Ross Seas in OCCAM model

• Published in: Ocean Science
• Main Authors: R. Kerr, K. J. Heywood, M. M. Mata, C. A. E. Garcia
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications 2012
• Subjects: geo; envir; Antarctic; Weddell; Weddell Sea; Antarc*
• Online Access: https://doi.org/10.5194/os-8-369-2012; http://www.ocean-sci.net/8/369/2012/os-8-369-2012.pdf; https://doaj.org/article/5251fee4ac434f488a55e6bc8f6ae8e7

We describe the seasonal and interannual variability of volume transports in the Weddell and Ross Seas using the 1/12° 20-yr simulation of the OCCAM global ocean general circulation model. The average simulated full-depth cumulative volume transports were 28.5 ± 2.9 Sv (1 Sv ≡ 106 m3 s−1) and 13.4 ± 5.2 Sv, across the main export regions of the Weddell and Ross Seas, respectively. The values of mean outflow of Antarctic Bottom Water (AABW) (defined by neutral density γn ≥ 28.27 kg m−3) from the Weddell and Ross Seas of 10.6 ± 3.1 Sv and 0.5 ± 0.7 Sv, respectively, agree with the range reported in historical observational studies. The export of Weddell Sea dense water in OCCAM is primarily determined by the strength of the Weddell Gyre. Variability in AABW export is predominantly at periods of ~1 yr and 2–4 yr.