01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-04-0290 |
| Title of Abstract | Impact of vertical resolutions in a global ocean general circulation model |
| Authors | Hasibur Rahaman*, Raheema Rahman, JieShun Zhu, Vijay Tallapragada , Avichal Mehra, K Srinivasu, Sudheer Joseph, T M Balakrishnan Nair, M Ravichandran |
| Organisation | INCOIS |
| Address | INCOIS Ocean Valley Pragathi Nagar, Telangana, India Pincode: 500090 E-mail: rahman@incois.gov.in |
| Country | India |
| Presentation | Oral |
| Abstract | Vertical resolution in an ocean general circulation model (OGCM) significantly impacts the model's ability to accurately represent ocean processes and their influence on climate and other phenomena. Higher vertical resolution leads to better representation of water masses, stratification, and vertical mixing, which can reduce biases in key variables like sea surface temperature (SST) and improve the simulation of ocean currents and heat transport. In this study, we show the global ocean model simulations with two different vertical resolutions but the same horizontal resolution. Two identical experiments were performed with CORE-II atmospheric forcing with cold starts using WOA23 temperature and salinity initialization. The meridional resolution is 1ⁿ4° between 10°S and10°N, gradually increasing to 1/2° poleward of 30 °S and 30 °N. Zonal resolution is a uniform 1/2° in both experiments. We used 40 layers in the vertical and bottom depth of approximately 4.5 km in both experiments. However, in one experiment we used 21 layers in the upper 200 m, and the first level at 5 m, and in another experiment we used 31 layers in the upper 200 m with uniform 1 m resolution in the upper 10 m with the first layer at 0.5 m. The results show significant improvement in the thermocline depth temperature when compared with EN4 observations in the higher vertical resolution experiment, as compared to coarse vertical resolution simulation. The sea surface temperature (SST) fronts are more notable, with a very prominent instability wave signature in the equatorial Pacific Ocean in the higher vertical resolution simulation compared to the coarse vertical resolution simulation. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Ocean Model, Thermocline depth , Sea Surface Temperature |
| For Awards | no |