Measurements of carbon dioxide (CO2) concentration carried out in the city of Rome showed an increase from 1995 (367 +/- 29 ppm mean yearly value) to 2004 (477 +/- 30 ppm, mean yearly value). The annual trend showed a peak in winter, 18% greater than the summer one correlated to traffic density (35 +/- 4 and 29 +/- 3 cars min(-1) mean winter and summer value, respectively). The weekly trend had the lowest values (414 +/- 19 ppm) during the weekends when traffic density was 72% reduced. The daily trend had a peak in the early morning when traffic was the highest and the atmosphere was more stable. The critical zones of the city (B zones) had 3.5% CO2 concentration higher than the park (D zone) and 18% more than the control zones (E zones). An increase of air temperatures from the surrounding zones (20.0 +/- 4.1 degrees C) to the centre of the city (28.9 +/- 1.2 degrees C, mean between A and B zones) was observed.
Daily and seasonal variation of CO2 in the city of Rome in relationship with the traffic volume / Gratani, Loretta; Varone, Laura. - In: ATMOSPHERIC ENVIRONMENT. - ISSN 1352-2310. - STAMPA. - 39:14(2005), pp. 2619-2624. [10.1016/j.atmosenv.2005.01.013]
Daily and seasonal variation of CO2 in the city of Rome in relationship with the traffic volume
GRATANI, Loretta;VARONE, LAURA
2005
Abstract
Measurements of carbon dioxide (CO2) concentration carried out in the city of Rome showed an increase from 1995 (367 +/- 29 ppm mean yearly value) to 2004 (477 +/- 30 ppm, mean yearly value). The annual trend showed a peak in winter, 18% greater than the summer one correlated to traffic density (35 +/- 4 and 29 +/- 3 cars min(-1) mean winter and summer value, respectively). The weekly trend had the lowest values (414 +/- 19 ppm) during the weekends when traffic density was 72% reduced. The daily trend had a peak in the early morning when traffic was the highest and the atmosphere was more stable. The critical zones of the city (B zones) had 3.5% CO2 concentration higher than the park (D zone) and 18% more than the control zones (E zones). An increase of air temperatures from the surrounding zones (20.0 +/- 4.1 degrees C) to the centre of the city (28.9 +/- 1.2 degrees C, mean between A and B zones) was observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.