Calculation of Deposition For Level I analysis

1. Run appropriate model for Level I analysis.

2. Assume no conversion of SO or NO to other species. 2 X

(i.e. assume all NO is emitted as NO and that all SO X 2 2

remains inert at this step.)

3. Multiply the concentrations of NO (μg/m ), if X

3

applicable by the ratio of the molecular weights of

the secondary species (HNO ) to the primary 3

species (NO ). 2

Note: The molecular weights of NO and HNO are 46 2 3

and 63. Thus multiplying the concentration

of NO (μg/m ) by 1.37 will yield the 2

3

concentration of HNO (μg/m ). 3

3

4. The majority of sulfur will be deposited as SO , so no 2

conversion is necessary.

5. The averaging times for deposition will generally

require a long term value (monthly, seasonal, or

annual) and short term value (1, 3 or 24-hour). Since

the Level I models will produce average values, they

must be converted to total rates.

Multiply the concentration of SO or HNO by the number 2 3

of seconds in the averaging time of interest to obtain

a total rate. (3.1536 × 10 seconds/year, 86400 7

seconds/day, 10800 seconds/3-hours, or 3600

seconds/hour)

6. Multiply the result of step 5 by the deposition

velocity for the appropriate pollutant. (0.005 m/s for

SO or 0.05 m/s for HNO ). This will result in a 2 3

deposition value in units of μg/m . 2

7. To convert to kg/hectare, multiply the result of step

7 by 10 . -5

Inset 2 - Description of method to estimate deposition from SO2

and NO concentrations.

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castellano: DIS CUS DES RAD english: DIS CUS DES RAD

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