Articles | Volume 4, issue 6
Atmos. Meas. Tech., 4, 1027–1044, 2011

Special issue: Cabauw Intercomparison campaign for Nitrogen Dioxide measuring...

Atmos. Meas. Tech., 4, 1027–1044, 2011

Research article 09 Jun 2011

Research article | 09 Jun 2011

Eight-component retrievals from ground-based MAX-DOAS observations

H. Irie1, H. Takashima1, Y. Kanaya1, K. F. Boersma2,3, L. Gast4, F. Wittrock5, D. Brunner6, Y. Zhou6, and M. Van Roozendael7 H. Irie et al.
  • 1Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan
  • 2Climate Observations Department, Royal Netherlands Meteorological Institute, P.O. Box 201, 3730 AE De Bilt, The Netherlands
  • 3Eindhoven University of Technology, Applied Physics, Eindhoven, The Netherlands
  • 4RIVM, P.O. Box 1, 3720 BA Bilthoven, The Netherlands
  • 5Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
  • 6Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland
  • 7Belgian Institute for Space Aeronomy, Ringlaan 3, 1180 Brussels, Belgium

Abstract. We attempt for the first time to retrieve lower-tropospheric vertical profile information for 8 quantities from ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations. The components retrieved are the aerosol extinction coefficients at two wavelengths, 357 and 476 nm, and NO2, HCHO, CHOCHO, H2O, SO2, and O3 volume mixing ratios. A Japanese MAX-DOAS profile retrieval algorithm, version 1 (JM1), is applied to observations performed at Cabauw, the Netherlands (51.97° N, 4.93° E), in June–July 2009 during the Cabauw Intercomparison campaign of Nitrogen Dioxide measuring Instruments (CINDI). Of the retrieved profiles, we focus here on the lowest-layer data (mean values at altitudes 0–1 km), where the sensitivity is usually highest owing to the longest light path. In support of the capability of the multi-component retrievals, we find reasonable overall agreement with independent data sets, including a regional chemical transport model (CHIMERE) and in situ observations performed near the surface (2–3 m) and at the 200-m height level of the tall tower in Cabauw. Plumes of enhanced HCHO and SO2 were likely affected by biogenic and ship emissions, respectively, and an improvement in their emission strengths is suggested for better agreement between CHIMERE simulations and MAX-DOAS observations. Analysis of air mass factors indicates that the horizontal spatial representativeness of MAX-DOAS observations is about 3–15 km (depending mainly on aerosol extinction), comparable to or better than the spatial resolution of current UV-visible satellite observations and model calculations. These demonstrate that MAX-DOAS provides multi-component data useful for the evaluation of satellite observations and model calculations and can play an important role in bridging different data sets having different spatial resolutions.