L1 /
10
CH3041
ANTARCTIC OZONE
HOLE I
• 1985 Antarctic stratospheric ozone : 50%
• ClO. +
NO2. ® ClONO2 (chlorine nitrate)
• normal
reservoir of Cl and NOx (NO, NO2)
• global circulation ®
ClONO2 at the pole.
• Polar winter, no new O3 , air temp < -70oC
• The air circulation becomes circumpolar
with nearly no admixture of air from lower
latitudes. [O3] and [ClONO2] are fixed.
with nearly no admixture of air from lower
latitudes. [O3] and [ClONO2] are fixed.
• Polar
Stratospheric Clouds (PSC,
HNO3.3H2O) form which contain acid
ice crystals, these maintain low [NO2].
HNO3.3H2O) form which contain acid
ice crystals, these maintain low [NO2].
