The scale of ozone destruction in clouds

Changes in the concentration of tropospheric ozone in clouds were investigated based on aircraft sensing data. Three ozonometers were used for the measurements—one chemiluminescent 3-02P and two UV 49C (Thermo Environment Inc., United States). The following types of clouds were studied: Cu, Cu med., St, Sc, As , and Ac . The thickness of the cloud layers was 1.5 km on average and varied from 0.4 to 4.5 km. The ozone destruction in clouds was 11–15 ppb on average and ranged from 3 to 34 ppb; it changed nearly twofold depending on the cloud type. The estimation of the annual runoff of ozone in clouds has shown that it is close to the annual ozone balance in the troposphere.