 |
| Titel |
Estimation of NOx emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data |
| VerfasserIn |
R. Shaiganfar, S. Beirle, M. Sharma, A. Chauhan, R. P. Singh, T. Wagner |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 21 ; Nr. 11, no. 21 (2011-11-03), S.10871-10887 |
| Datensatznummer |
250010164
|
| Publikation (Nr.) |
 copernicus.org/acp-11-10871-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| We present the first Multi-Axis-(MAX-) DOAS observations in India performed
during April 2010 and January 2011 in Delhi and nearby regions. The MAX-DOAS
instrument was mounted on a car roof, which allowed us to perform
measurements along individual driving routes. From car MAX-DOAS observations
along closed circles around Delhi, together with information on wind speed
and direction, the NOx emissions from the greater Delhi area were
determined: our estimate of 4.4 × 1025 molecules s−1 is found to be
slightly lower than the corresponding emission estimates using the EDGAR
emission inventory and substantially smaller compared to a recent study by
Gurjar et al. (2004). We also determined NOx emissions from Delhi using
OMI satellite observations on the same days. These emissions are slightly
smaller than those from the car MAX-DOAS measurements. Finally the car
MAX-DOAS observations were also used for the validation of simultaneous OMI
satellite measurements of the tropospheric NO2 VCD and found a good
agreement of the spatial patterns. Concerning the absolute values, OMI data
are, on average, higher than the car MAX-DOAS observations close to strong
emission sources, and vice versa over less polluted regions. Our results
indicate that OMI NO2 VCDs are biased low over strongly polluted
regions, probably caused by inadequate a-priori profiles used in the OMI
satellite retrieval. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|