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An improved tropospheric NO2 column retrieval algorithm for the ozone monitoring instrument

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  • Computer Science

Abstract

Atmos. Meas. Tech., 4, 1905–1928, 2011 www.atmos-meas-tech.net/4/1905/2011/ doi:10.5194/amt-4-1905-2011 © Author(s) 2011. CC Attribution 3.0 License. Atmospheric Measurement Techniques An improved tropospheric NO2 column retrieval algorithm for the Ozone Monitoring Instrument K. F. Boersma1,2, H. J. Eskes1, R. J. Dirksen1, R. J. van der A1, J. P. Veefkind1, P. Stammes1, V. Huijnen1, Q. L. Kleipool1, M. Sneep1, J. Claas1, J. Leita˜o3, A. Richter3, Y. Zhou4, and D. Brunner4 1Royal Netherlands Meteorological Institute, De Bilt, The Netherlands 2Eindhoven University of Technology, Fluid Dynamics Lab, The Netherlands 3Institute for Environmental Physics and Institute of Remote Sensing, University of Bremen, Germany 4EMPA, Swiss Federal Laboratories for Materials Science and Technology, Du¨bendorf, Switzerland Received: 15 March 2011 – Published in Atmos. Meas. Tech. Discuss.: 26 April 2011 Revised: 26 July 2011 – Accepted: 1 September 2011 – Published: 16 September 2011 Abstract. We present an improved tropospheric nitrogen dioxide column retrieval algorithm (DOMINO v2.0) for OMI based on better air mass factors (AMFs) and a correc- tion for across-track stripes resulting from calibration er- rors in the OMI backscattered reflectances. Since October 2004, NO2 retrievals from the Ozone Monitoring Instrument (OMI), a UV/Vis nadir spectrometer onboard NASA’s EOS- Aura satellite, have been used with success in several sci- entific studies focusing on air quality monitoring, detection of trends, and NOx emission estimates. Dedicated evalua- tions of previous DOMINO tropospheric NO2 retrievals in- dicated their good quality, but also suggested that the tropo- spheric columns were susceptible to high biases (by 0–40 %), probably because of errors in the air mass factor calculations. Here we update the DOMINO air mass factor approach. We calculate a new look-up table (LUT) for altitude-dependent AMFs based on more realistic atmospheric profile parame- ters, and include more surface albedo and s

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