Impact of an equatorward shift of the SH westerlies on the carbon cycle ...

• Main Authors: Menviel, Laurie, Spence, Paul
• Format: Dataset
• Language: unknown
• Published: UNSW Sydney 2021
• Subjects: SH westerly winds; Ocean Circulation; Atmospheric CO2; 370802 Chemical oceanography; 370803 Physical oceanography; 190507 Global effects of climate change excl. Australia, New Zealand, Antarctica and the South Pacific excl. social impacts; New Zealand; Pacific; Spence; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.26190/unsworks/1608; http://hdl.handle.net/1959.4/100008

A control and 4 deg equatorward SH westerly wind shift (PTB) experiments are performed with the MOM5-SIS-WOMBAT (1/4 degree horizontal resolution) model. The impact of the 4 deg equatorward SH westerly wind shift on the oceanic circulation and ocean biogeochemistry is investigated. Methods and results are described in Gray W., de Lavergne C., Wills, R.C.J., Menviel, L., Spence, P., Holzer M., Kageyama, M., Michel, E., Poleward shift in the Southern Hemisphere westerly winds synchronous with the deglacial rise in CO2, 2021, In review ... : A control and 4 deg equatorward SH westerly wind shift (PTB) experiments are performed with the MOM5-SIS-WOMBAT (1/4 degree horizontal resolution) model. MOM5-SIS-WOMBAT has a Mercator horizontal resolution of 0.25° (~11 km grid spacing at 65°S), and 50 vertical levels (Hogg et al., 2017, Menviel et al., 2018). The model is initialised with modern-day temperature and salinity distributions, and biophysical fields derived from an observation-based climatology (GLODAP v2, 2016). The model is then spun-up for 700 years with version 2 of the Coordinated Ocean-ice Reference Experiments (CORE) Normal Year Forcing (NYF) reanalysis data, representative of a ‘normal year’ during the recent instrumental period. A 4° equatorward shift (with no change in magnitude) is applied to the near surface wind speeds between 25°S and 70°S in the PTB experiment. The experiment is run for 125 years. ...