 |
| Titel |
Estimation of the Ozone Destruction in Clouds Derived from the Airborne Measurements |
| VerfasserIn |
Boris Belan, Mikhail Arshinov, Aleksandr Fofonov, Gennadii Tolmachev |
| Konferenz |
EGU General Assembly 2010
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250034069
|
|
|
|
|
|
| Zusammenfassung |
| Variations of tropospheric ozone concentration are studied based on the airborne
sounding data. The chemiluminescent 3-02P (OPTEC, Russia) and two UV Model 49C
(Thermo Electron Corp., USA) ozone analysers were used in these measurements
simultaneously. Clouds of Cu, Cu med., St, Sc, As, and Ac types were studied. The
thickness of cloud layers was 1.5 km on the average and varied from 0.4 to 4.5 km.
The ozone destruction in clouds was 11–15 ppb on the average and within a range
from 3 to 34 ppb. The destruction varied almost twofold depending on a cloud
type.
The decrease in the ozone concentration in Cu med. exceeds those in Ac clouds by 1.75
times. The widest variation range of ozone concentration is also in Cu med. The relative
variation is maximum in As clouds, it reaches 27%. The minimum one (17%) has
been recorded in Cu, St, and Ac clouds; this is seemingly caused by their water
content.
The given above data on variations of ozone concentration in clouds allow estimation to
the first approximation of the ozone sink scales from the troposphere while interacting with
cloud aerosols.
The annual mean amount of clouds over the Earth is 5.8, i.e. 58% of the surface is
covered by clouds. The Earth area is 5.1 Ã1014 m2. During our experiments, we have
obtained the thickness of cloud cover equal to 1.5Â km; hence, the volume where the ozone
sink occurs is 4.44Ã1017 m3. According to the data available, the variation of ozone
concentration is 11 ppb by the “minimum” and 15 ppb by the “maximum” ozonometers, or
22 and 30 μg/m3. Multiplying the volume by the concentration, obtain 97.6 and 133.1 Tg of
ozone precipitating on aerosol particles in clouds. So obtained estimate is close to
the values of annual tropospheric ozone budget and equal to 141 and 241Â Tg per
year.
This work was funded by Presidium of RAS (Program No. 16), Brunch of Geology,
Geophysics and Mining Sciences of RAS (Program No 5), Russian Foundation for Basic
Research (grant No 08-05-92499), and Federal Agency for Science and Innovation (State
Contract |
|
|
|
|
|
|