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Definition of Dobson unit

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Definition of Dobson unit

1 Dobson Unit (DU) is defined to be 0.01 mm thickness at standard temperature and pressure (STP)

How many molecules are in a column with area 1 cm

2

and containing 300 DU of ozone?

k is Boltzmann’s constant = 1.3806505(24) × 10−23 J K−1 T is 273 K

P=1 atm=1013.25 mbar=101325 Pa A=1cm2=10-4m2

h=height of ozone column at STP=3 mm

(2)

Spectra calculations

Spectral global Irradiance in W/m

2

/nm

•Spec1

•Spec2 Calculate :

•Total integrated UV irradiance

•UVA irradiance

•UVB irradiance

•UV Index

(3)

Airmass for spherical atmosphere

The airmass for a plane parallel atmosphere is m=1/cos 

0

In reality, the Earth atmosphere is curved.

R

h

The airmass m = 1/cos

m

0

Calculate the airmass for a solar angle 

0

=75º and 85 º at a height of 22 km and 5

km and compare it to the plane parallel case.

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