Table 1 Summary of the polar vortex initial states and eruption source parameters for the model experiments.

From: Volcanic forcing of high-latitude Northern Hemisphere eruptions

Model experiment

Initial polar vortex statea

SO2 [Tg]

HCl [Tg]

HBr [Gg]

Altitude [km]

Month

Baseline experiment ensemble

 

1

     
 

2

     

H-24km

3

17

2.93

9.5

24

January

 

4

     
 

5

     
 

6

     

Sensitivity experiments

S-24km

3

17

24

January

H-24km-jul

17

2.93

9.5

24

July

S-24km-jul

17

24

July

H-16km

3

17

2.93

9.5

16

January

S-16km

3

17

16

January

H-16km-jul

17

2.93

9.5

16

July

S-16km-jul

17

16

July

  1. aPolar vortex states 1−6, here ordered by the resulting e-folding time of the injected SO2, are shown in Fig. 2c and Supplementary Figs. 6 and 7. Not applicable to July experiments.