Variability of Tropospheric Composition associated with Global Circulation Patterns using Satellite Data

 A contribution to ACCENT-TROPOSAT-2, Task Group 2

 Célia Gouveia

Sup. School of Technology, Inst. Polytechnics of Setúbal (IPS), Setúbal, Portugal


Tel: +351265790000

Fax: +351265721869


The goal of the current proposal is to analyze how climate variability and associated large-scale circulation modes are related to low atmospheric composition and eventual atmospheric composition change.


Activity 1

First, we will examine both nitrogen dioxide (NO2) and ozone (O3) concentrations. Observations of the tropospheric columns of NO2 and O3 concentrations are available from the GOME instrument. Seasonal cycles will be quantified and compared for these substances. The year-to-year variability of atmospheric composition will be analyzed and compared with the most important mode of variability in North Atlantic area, the North Atlantic Oscillation (NAO).  The same assessment will be performed using the EMEP data, in order to compare and validate this study.

Activity 2

Additionally, with the purpose to assess which are the main meteorological conditions related to the most extreme events of high O3 concentration levels, we will investigate the impact of NAO in several meteorological variables, for these situations. These studies reveal to be crucial, considering the recent trend of NAO to be positive and its recognized influence in temperature and precipitation.


Time Schedule

Activity 1                                                          2006    2007    2008

Activity 2                                                                      2007    2008    2009


Approximate manpower and cost

                                                            2006                2007                2008                2009

Personal / man-years                          0.6                   0.6                   0.6                   0.6

Yearly cost (k€)                                  12                    12                    12                    12       


Co-workers (Name, Surname, Gender, Email)

Margarida Liberato, female,

Physics Dept., Univ. of Trás-os-Montes and Alto Douro, Vila Real, Portugal.

Teresa Calado, female,

Lisbon Geophysical Centre (CGUL), Faculty of Sciences, Univ. of Lisbon, Lisbon, Portugal.



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