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Botkin Environmental Science Earth as Living Planet 8th txtbk

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21.3 High-Altitude (Stratospheric) Ozone Depletion 485<br />

80<br />

Wind speed (m/p second)<br />

Africa<br />

Region where ozone<br />

depletion is confined<br />

Antarctica<br />

30 km<br />

10 km<br />

0<br />

South America<br />

(a)<br />

Sunlight<br />

CIONO 2<br />

and<br />

HCI<br />

on cloud<br />

particle edges<br />

Polar stratospheric<br />

cloud<br />

CI 2<br />

CI<br />

CI<br />

O 3<br />

O 2<br />

O 2<br />

CIO<br />

+<br />

CIO<br />

Sunlight<br />

CI 2 O 2<br />

O 3<br />

O 2<br />

(b)<br />

HNO 3<br />

Denitrification of air m<strong>as</strong>s<br />

Ozone-depleting<br />

chain reactions<br />

FIGURE 21.16 (a) Idealized diagram of the Antarctic polar vortex and (b) the role of polar<br />

stratospheric clouds in the ozone-depletion chain reaction. (Source: B<strong>as</strong>ed on O.B. Toon and R.P.<br />

Turco, “Polar Stratospheric Clouds and Ozone Depletion,” Scientific American, 264, no. 6 [1991]:<br />

68–74.)<br />

<br />

<br />

<br />

<br />

<br />

Ultraviolet (UV) Index <br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

a.m. p.m.<br />

<br />

<br />

-

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