Overriding hindcast experimental results in MIROC6 climate model
Data files
Sep 06, 2024 version files 6.64 GB
Abstract
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.
README: Overriding hindcast experimental results in MIROC6 climate model
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: EXP-Clm-El_Nino-mem1.zip
Description: 10 El Nino events in member 1 are rerun with the NPO forcing is removed. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-0.5P-El_Nino-mem1.7z
Description: 10 El Nino events in member 1 are rerun with 0.5 times NPO forcing. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-1.0P-El_Nino-mem1.zip
Description: 10 El Nino events in member 1 are rerun with 1.0 times NPO forcing. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-2.0P-El_Nino-mem1.zip
Description: 10 El Nino events in member 1 are rerun with 2.0 times NPO forcing. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-3.0P-El_Nino-mem1.zip
Description: 10 El Nino events in member 1 are rerun with 3.0 times NPO forcing. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-Clm-La_Nina-mem1.zip
Description: 10 La Nina events in member 1 are rerun with the NPO forcing is removed. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-0.5N-La_Nina-mem1.zip
*Description: * 8 La Nina events in member 1 are rerun with 0.5 times NPO forcing. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-1.0N-La_Nina-mem1.zip
Description: 8 La Nina events in member 1 are rerun with 1.0 times NPO forcing. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-2.0N-La_Nina-mem1.zip
Description: 8 La Nina events in member 1 are rerun with 2.0 times NPO forcing. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-3.0N-La_Nina-mem1.zip
Description: 8 La Nina events in member 1 are rerun with 3.0 times NPO forcing. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-Clm-El_Nino-mem2.zip
Description: 7 El Nino events in member 2 are rerun with the NPO forcing is removed. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-0.5P-El_Nino-mem2.zip
Description: 7 El Nino events in member 2 are rerun with 0.5 times NPO forcing. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-1.0P-El_Nino-mem2.zip
Description: 7 El Nino events in member 2 are rerun with 1.0 times NPO forcing. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-3.0P-El_Nino-mem2.zip
Description: 7 El Nino events in member 2 are rerun with 3.0 times NPO forcing. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-2.0P-El_Nino-mem2.zip
Description: 7 El Nino events in member 2 are rerun with 2.0 times NPO forcing. The output of each El Niño event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-1.0N-La_Nina-mem2.zip
Description: 6 La Nina events in member 2 are rerun with 1.0 times NPO forcing. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-0.5N-La_Nina-mem2.zip
Description: 6 La Nina events in member 2 are rerun with 0.5 times NPO forcing. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-2.0N-La_Nina-mem2.zip
Description: 6 La Nina events in member 2 are rerun with 2.0 times NPO forcing. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-Clm-La_Nina-mem2.zip
Description: 6 La Nina events in member 2 are rerun with the NPO forcing is removed. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
File: EXP-3.0N-La_Nina-mem2.zip
Description: 6 La Nina events in member 2 are rerun with 3.0 times NPO forcing. The output of each La Nina event is stored in a folder named 'y' followed by the year in which it occurs.
Each folder has the same list of variable outputs from the previous year to the following year of each ENSO event. The following variables are used for the data analysis and are included in each folder.
evap: surface_upward_latent_heat_flux
sens: surface_upward_sensible_heat_flux
slp: air_pressure_at_sea_level
slrd: surface_downwelling_longwave_flux_in_air
ssrd: surface_downwelling_shortwave_flux_in_air
sst: sea_water_temperature
taux: zonal wind stress
tauy: meridional wind stress
u10: zonal wind at 10m
v10: meridional wind at 10m
Code/software
These datasets are in NetCDF format, you can use either NCL (NCAR Command Language) or Python to open them.