This repository contains time series of annual-mean globally-averaged variables from various CMIP6 experiments, together with analysis of climate sensitivities, forcing and feedbacks.
Anomalies are calculated by subtracting the trend in piControl calculated over the time period parallel to the perturbation experiment, as in Andrews et al. (2012) and Forster et al. (2013).
| filename | description |
|---|---|
delta_tas_abrupt-4xCO2_cmip6.csv |
anomalies in surface air temperature [tas] relative to piControl in the abrupt-4xCO2 experiment |
delta_net_abrupt-4xCO2_cmip6.csv |
anomalies in net top-of-atmosphere flux [rsdt - rsut - rlut], relative to piControl in the abrupt-4xCO2 experiment |
delta_tas_1pctCO2_cmip6.csv |
anomalies in surface air temperature [tas] relative to piControl in the 1pctCO2 experiment |
delta_variable_experimentid_cmip6.csv |
anomalies in variable relative to piControl in the experiment_id experiment |
table_gregory_plot_cmip6.csv
Linear regression of anomaly in net top-of-atmosphere flux vs. anomaly in surface air temperature over the first 150 years of the abrupt-4xCO2 experiment, following Gregory et al. (2004).
| parameter | description | units |
|---|---|---|
| Model | CMIP6 Source ID | |
| F4x | 4xCO2 forcing (intercept) | W m-2 |
| lambda | climate feedback (slope) | W m-2 K-1 |
| ECS | effective climate sensitivity | K |
table_tcr_cmip6.csv
| parameter | description | units |
|---|---|---|
| TCR | transient climate response | K |
| T140 | tas anomaly averaged over years 131-150 | K |
| ratio | T140 / TCR | unitless |
table_two_layer_cmip6.csv
Fit to the two-layer model of the surface air temperature anomalies in the abrupt-4xCO2 experiment using the method described in Geoffroy et al. (2013).
| parameter | description | units |
|---|---|---|
| tau_f | fast (mixed layer) timescale | years |
| tau_s | slow (deep ocean) timescale | years |
| gamma | transfer co-efficient | W m-2 K-1 |
| C | mixed-layer heat capacity | W m-2 K-1 yrs |
| C_O | deep-ocean heat capacity | W m-2 K-1 yrs |
| a_f | contribution from fast mode | unitless |
| a_s | contribution from slow mode, 1 - a_f | unitless |
I acknowledge the World Climate Research Programme, which, through its Working Group on Coupled Modelling, coordinated and promoted CMIP6. I thank the climate modeling groups for producing and making available their model output, the Earth System Grid Federation (ESGF) for archiving the data and providing access, and the multiple funding agencies who support CMIP6 and ESGF.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
