The time needed by deep convection to bring the atmosphere back to equilibrium is called convective adjustment timescale or simply adjustment timescale, typically denoted by 𝜏. In the Community Atmospheric Model (CAM), convective adjustment timescale is a tunable parameter with one value, 1 hour, worldwide. Albeit, there is no justified reason why one adjustment timescale value should work over land and ocean both. Continental and oceanic convection are different in terms of the vigor of updrafts and hence can have different longevities. So it is logical to investigate the prescription of two different convective adjustment timescales for land (𝜏𝐿) and ocean (𝜏𝑂) . To understand the impact of representing land-ocean heterogeneity via 𝜏, we investigate CAM climate simulations for two different convective adjustment timescales for land and ocean in contrast to having one value globally.

Following a comparative analysis of 5-year-long climate simulations, we find 𝜏𝑂 = 4 hrs and 𝜏𝐿 = 1 hr to yield the best results. Particularly, we find better MJO simulations. Although these 𝜏 values were chosen empirically and require further tunning, the conclusion of our finding remains the same, which is the recommendation to use two different 𝜏 values for land and ocean.