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Analysis of near-surface ozone variations in Terra Nova Bay, Antarctica

Published online by Cambridge University Press:  27 February 2008

P. Cristofanelli ,
P. Bonasoni ,
F. Calzolari ,
U. Bonafè ,
C. Lanconelli ,
A. Lupi ,
G. Trivellone ,
V. Vitale  and
B. Petkov
P. Cristofanelli
Affiliation:
ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy
P. Bonasoni*
Affiliation:
ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy
F. Calzolari
Affiliation:
ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy
U. Bonafè
Affiliation:
ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy
C. Lanconelli
Affiliation:
ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy
A. Lupi
Affiliation:
ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy
G. Trivellone
Affiliation:
ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy
V. Vitale
Affiliation:
ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy
B. Petkov
Affiliation:
ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy
*
*Corresponding author:P.Bonasoni@isac.cnr.it
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Abstract

Ozone concentration measurements were made during December from 2001–2005 to quantify the contributions of different processes to near-surface ozone concentrations (O3) in Terra Nova Bay, Antarctica. The average O3 concentration was 20.3 ppbv. On days characterized by high solar radiation fluxes (HSR), significantly higher concentrations of O3 (21.3 ppbv) were recorded compared to days with low solar radiation fluxes (LSR days, 16.8 ppbv). High O3 concentrations could be related to strong winds from SW–NW. Three-dimensional back-trajectories show that air from the interior of the continent could affect O3 at Terra Nova Bay. Moreover, during HSR days, high O3 concentrations were also recorded in connection with weak circulation, suggesting that emissions from the Italian base (located 2 km north) could also represent a significant source of O3. To clarify the role of local pollution in Terra Nova Bay, O3 values were also calculated using the photochemical steady state (PSS) approximation under clear sky and cloudy conditions.

Keywords

katabatic windsolar radiation fluxessurface ozonetropospheric ozone
Type
Physical Sciences
Information
Antarctic Science , Volume 20 , Issue 4 , August 2008 , pp. 415 - 421
Copyright
Copyright © Antarctic Science Ltd 2008

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