### Vertical Mass Distribution

Posted:

**February 7th, 2021, 9:50 am**Dear all,

I used HYSPLIT (concentration dispersion component) to run a particle dispersal simulation for 25 hours. I then checked the vertical mass distribution in the message file.

After the 24th hour of the simulation, the proportion of the mass at each height level to the total mass remained in the atmosphere was shown below.

Index Height %Mass

11 3360.0 0.32

10 2755.0 2.49

9 2210.0 14.98

8 1725.0 30.96

7 1300.0 25.90

6 935.0 24.16

5 630.0 12.90

4 385.0 11.81

3 200.0 15.54

2 75.0 5.89

1 10.0 2.06

I summed all proportions and it turned out to be 147.01%. It does not make sense to me. Should the sum of all proportions be 100%?

It would be great if you could explain it. Your help would be much appreciated. Thanks.

Kind Regards,

Ming

I used HYSPLIT (concentration dispersion component) to run a particle dispersal simulation for 25 hours. I then checked the vertical mass distribution in the message file.

After the 24th hour of the simulation, the proportion of the mass at each height level to the total mass remained in the atmosphere was shown below.

Index Height %Mass

11 3360.0 0.32

10 2755.0 2.49

9 2210.0 14.98

8 1725.0 30.96

7 1300.0 25.90

6 935.0 24.16

5 630.0 12.90

4 385.0 11.81

3 200.0 15.54

2 75.0 5.89

1 10.0 2.06

I summed all proportions and it turned out to be 147.01%. It does not make sense to me. Should the sum of all proportions be 100%?

It would be great if you could explain it. Your help would be much appreciated. Thanks.

Kind Regards,

Ming