Izvorni znanstveni članak
COMBINED USE OF SPACE-BORNE OBSERVATIONS OF NO2 AND REGIONAL CTM MODEL FOR AIR QUALITY MONITORING IN NORTHERN ITALY
A. Petritoli
; Institute of Atmospheric Science and Climate, ISAC-CNR, via P. Gobetti 101, 40129, Bologna, Italy
E. Palazzi
; Institute of Atmospheric Science and Climate, ISAC-CNR, via P. Gobetti 101, 40129, Bologna, Italy
G. Giovanelli
; Institute of Atmospheric Science and Climate, ISAC-CNR, via P. Gobetti 101, 40129, Bologna, Italy
W. di Nicolantonio
; Carlo Gavazzi Space at ISAC-CNR, via P. Gobetti 101, 40129, Bologna, Italy
G. Ballista
; Carlo Gavazzi Space at ISAC-CNR, via P. Gobetti 101, 40129, Bologna, Italy
C. Carnevale
; Department of Electronics for Automation, University of Brescia, Italy
G. Finzi
; Department of Electronics for Automation, University of Brescia, Italy
E. Pisoni
; Department of Electronics for Automation, University of Brescia, Italy
M.L. Volta
; Department of Electronics for Automation, University of Brescia, Italy
Sažetak
The use of space-borne measurements of trace gas constituents for air quality monitoring is considerably increased during
the past decade. This is due mainly to the new generation sensors able to observe large areas with good temporal resolution and due
to new assimilation techniques that allow a synergetic use of information from satellite and from Chemical Transport Models
(CTM). In fact the in situ sampling method used by the local environmental agencies for air quality monitoring is becoming too
expensive to be further continued without a sensible reduction in the number of observing stations.
In this paper we present the work that has been performed so far within the QUITSAT project funded by the Italian Space Agency.
SCIAMACHY (Uv-Vis spectrometer on board ESA-ENVISAT platform from 2002) observations of earth radiance are used to
retrieve NO2 tropospheric column by DOAS spectrometric technique and radiative transfer modelling for AMF computation. Such
kind of product has been widely used to estimate emissions, to monitor pollution hot spot as well as cross country and
intercontinental transport. Within this work we have merged the column measurements of nitrogen dioxide with the simulations of
the Transport Chemical Aerosol Model (TCAM) to improve the model output at the ground level. The method used is a weighted
rescaling of the model column in the troposphere according to the SCIAMACHY observations where the weights are the
measurement errors and the model column variances within the satellite ground-pixel, respectively. The employed data are related to
the Northern Italy area.
The obtained ground concentrations of NO2 have been compared with in-situ observations performed by the regional environmental
agencies. Results show good agreement mainly where well horizontal mixing is present. The ground concentration from
SCIAMACHY-TCAM gives an average NO2 amount within the satellite ground-pixel of 30x60 km2 that is important information
for air quality assessment on a regional and/or national scale not easy to obtain only with ground-based observations. Our
conclusions thus stress also the actual potential role of satellite observations combined with regional CTM models in the context of
air quality monitoring, mainly in rural area, where the ground-based observations are missing.
Ključne riječi
Earth Observation Satellite data; Chemical Transport Models,NO2
Hrčak ID:
64233
URI
Datum izdavanja:
12.12.2008.
Posjeta: 1.073 *