Analysis of near-surface ozone variations in Terra Nova Bay, Antarctica
Abstract Ozone concentration measurements were made during December from 2001–2005 to quantify the contributions of different processes to near-surface ozone concentrations (O 3 ) in Terra Nova Bay, Antarctica. The average O 3 concentration was 20.3 ppbv. On days characterized by high solar radiatio...
Published in: | Antarctic Science |
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Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2008
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Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0954102008001028 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102008001028 |
Summary: | Abstract Ozone concentration measurements were made during December from 2001–2005 to quantify the contributions of different processes to near-surface ozone concentrations (O 3 ) in Terra Nova Bay, Antarctica. The average O 3 concentration was 20.3 ppbv. On days characterized by high solar radiation fluxes (HSR), significantly higher concentrations of O 3 (21.3 ppbv) were recorded compared to days with low solar radiation fluxes (LSR days, 16.8 ppbv). High O 3 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 O 3 at Terra Nova Bay. Moreover, during HSR days, high O 3 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 O 3 . To clarify the role of local pollution in Terra Nova Bay, O 3 values were also calculated using the photochemical steady state (PSS) approximation under clear sky and cloudy conditions. |
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