Evidence for photochemical production of ozone at the South Pole surface

Citation
Jh. Crawford et al., Evidence for photochemical production of ozone at the South Pole surface, GEOPHYS R L, 28(19), 2001, pp. 3641-3644
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOPHYSICAL RESEARCH LETTERS
ISSN journal
0094-8276 → ACNP
Volume
28
Issue
19
Year of publication
2001
Pages
3641 - 3644
Database
ISI
SICI code
0094-8276(20011001)28:19<3641:EFPPOO>2.0.ZU;2-P
Abstract
Observations of OH, NO, and actinic flux at the South Pole surface during D ecember 1998 suggest a surprisingly active photochemical environment which should result in photochemical production of ozone. Long-term South Pole in situ ozone data as well as sonde data also appear to support this conclusi on. Other possible factors contributing to ozone variability such as strato spheric influence and the origin of air transported to the South Pole are a lso explored. Based on box model calculations it is estimated that photoche mistry could add 2.2 to 3.6 ppbv/day of ozone to surface air parcels residi ng on the Antarctic polar plateau. Although the oxidizing potential of the polar plateau appears to be exceptionally high for a remote site, it is unl ikely that it has a significant impact on surrounding regions such as the S outhern Ocean and the Antarctic free troposphere. These new findings do sug gest, however, that the enhanced oxidizing power of the polar plateau may n eed to be considered in interpreting the chemical history of climate proxy species in ice cores.