Validation of NO2 Tropospheric Column from Space
in the Po Valley, Italy

A contribution to ACCENT-TROPOSAT-2, Task Group 3

Andrea Petritoli

National Research Council, Institute of Atmospheric Science and Climate (ISAC-CNR)
via P. Gobetti 101, I-40129, Bologna, Italy
Tel.:  +39-051-6399584
e-mail:  a.petritoli@isac.cnr.it
Fax:  +39-051-6399584

The target of this contribution to the TROPOSAT program is to validate the tropospheric NO2 measurements from space in the Po valley region. The Po basin (Northern Italy) is one of the main NO2 source area in Europe. Its orography (surrounded by the Alps from north and west and by the Apennines from south) contributes to maintaining the pollutants near the source regions for several days often causing very high NO2 concentrations. Measurements from space could be important to study the transport of NO2 from such hot spots and to monitor regions not covered with ground instrumentation. But, of course, validation of the satellite products is required. Determination of the NO2 tropospheric column amount from satellites (GOME and SCIAMACHY at present, but also other missions in the near future, as OMI and GOME-2) is quite a new approach and monitoring the troposphere from space is often difficult as several factors such as albedo, clouds, sensibility to the lowest atmospheric layers (where actually pollution is produced), aerosols etc. have influence on the retrieved NO2 amount. In this scenario validation means finding a methodology to give a correct interpretation to the satellite measurements and use them, combined with ground observations, to study the tropospheric chemistry. Ground-based remote sensing measurements of NO2 using UV-Visible spectrometers and in situ NO2 concentrations (from regional service measurements and from remote sensing instruments) will be used to compare and integrate the satellite information. Meteorological parameters and models will be used to estimate the possible vertical distribution of pollutants within PBL. The activity can be thus summarized as follows

1.      Data analysis from ground-based stations to retrieve NO2 column in the PBL (by means of DOAS observations) and in situ concentration in representative sites. The PBL column,
Fig. 1, is obtained using simultaneous DOAS zenith sky observations in
Bologna
(50 m a.s.l.) and Mt. Cimone (2165 m a.s.l.).

2.      Validation of the satellites tropospheric NO2 measurements, mainly GOME and SCIAMACHY (processed by Task group 1) in the first period and also other platforms (OMI, GOME-2) in subsequent years.

3.      Study of the integration of satellite measurements within the environmental regional service monitoring.

 

Figure 1: NO2 column in the PBL (50-2165 m a.s.l.) observed in Bologna between 15th July 2003 and
22nd July 2003.

Time schedule

 

2004

2005

2006

2007

2008

2009

Activity 1

***

***

***

**

*

*

Activity 2

**

***

***

**

*

*

Activity 3

 

*

***

**

**

**

Approximate manpower and cost

 

2004

2005

2006

2007

2008

2009

Personnel / man-years

1.2

1.2

0.5

0.5

0.5

0.5

Yearly cost (kECU)

60

60

30

30

30

30

Likely funding agencies

Italian space Agency (ASI)

Co-workers

Dr. Fabrizio Ravegnani            

National Research Council
Institute of Atmospheric Science and Climate (ISAC-CNR)
via P. Gobetti 101, I-40129, Bologna, Italy
Tel.:  +39-051-6399589
Fax:  +39-051-6399584

Dr. Giorgio Giovanelli              

National Research Council
Institute of Atmospheric Science and Climate (ISAC-CNR)
via P. Gobetti 101, I-40129, Bologna, Italy
Tel.:  +39-051-6399591
Fax:  +39-051-6399584

 


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