Overriding hindcast experimental results in MIROC6 climate model

To examine the impact of winter NPO on subsequent ENSO development, we perform the identical-twin hindcast experiments taking the two ensemble members from the large ensemble historical simulations as a reference. In our overriding experiments, we rerun each ENSO event by applying NPO forcings with different intensities. Five different levels of NPO forcing are considered: no NPO forcing, 0.5 times NPO forcing, 1.0 times NPO forcing, 2.0 times NPO forcing, and 3.0 times NPO forcing. For El Niño events, five levels of positive NPO forcing are applied in the preceding winter, labeled as EXP-Clm, EXP-0.5P, EXP-1.0P, EXP-2.0P, and EXP-3.0P. Similarly, experiments for La Niña/-NPO events are labeled as EXP-Clm, EXP-0.5N, EXP-1.0N, EXP-2.0N, and EXP-3.0N, representing five intensities of negative NPO forcing., , , # Overriding hindcast experimental results in MIROC6 climate model

[https://doi.org/10.5061/dryad.nvx0k6f10](https://doi.org/10.5061/dryad.nvx0k6f10)

## Description of the data and file structure

Numerical experiments are conducted using MIROC6 climate model. To quantify the impact of the winter NPO on the subsequent ENSO evolution, we use the first two members from the MIROC6 large-ensemble as a reference. We identify 17 El Niño/+NPO and 15 La Niña/-NPO events in these two members and these events are averaged to create the NPO-related atmospheric anomalies. We then rerun each ENSO event starting from January 1st of year(-1) with the same initial condition as its original historical simulations and override the surface heat flux and wind stress anomalies over the North Pacific with the composite anomalies taken from two-members historical simulations for five months from November 1st of Year(-1) to March 31st of Year(0).

### Description of the data and file structure

#### File: EX...