Estimation of NOx emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data
Item
Title (Dublin Core)
Estimation of NOx emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data
Description (Dublin Core)
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 NO<sub>x</sub> emissions from the greater Delhi area were determined: our estimate of 4.4 × 10<sup>25</sup> molecules s<sup>−1</sup> 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 NO<sub>x</sub> 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 NO<sub>2</sub> 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 NO<sub>2</sub> VCDs are biased low over strongly polluted regions, probably caused by inadequate a-priori profiles used in the OMI satellite retrieval.
Creator (Dublin Core)
Shaiganfar, R.
Beirle, S.
Sharma, M.
Chauhan, A.
Singh, R. P.
Wagner, T.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
info:eu-repo/semantics/Text
Format (Dublin Core)
info:eu-repo/semantics/application/pdf
Identifier (Dublin Core)
10.5194/acp-11-10871-2011
https://acp.copernicus.org/articles/11/10871/2011/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
Relation (Dublin Core)
info:eu-repo/grantAgreement/EC/FP7/212520
Rights (Dublin Core)
info:eu-repo/semantics/openAccess
