World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Tropospheric No2 Column Densities Deduced from Zenith-sky Doas Measurements in Shanghai, China, and Their Application to Satellite Validation : Volume 9, Issue 11 (05/06/2009)

By Chen, D.

Click here to view

Book Id: WPLBN0003994858
Format Type: PDF Article :
File Size: Pages 22
Reproduction Date: 2015

Title: Tropospheric No2 Column Densities Deduced from Zenith-sky Doas Measurements in Shanghai, China, and Their Application to Satellite Validation : Volume 9, Issue 11 (05/06/2009)  
Author: Chen, D.
Volume: Vol. 9, Issue 11
Language: English
Subject: Science, Atmospheric, Chemistry
Collection: Periodicals: Journal and Magazine Collection
Subcollection: Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description
Description: Department of Environmental Science & Engineering, Fudan University, Shanghai, China. Zenith-sky scattered sunlight observations using differential optical absorption spectroscopy (DOAS) technique were carried out in Shanghai, China (31.3° N, 121.5° E) since December 2006. At this polluted urban site, the measurements provided NO2 total columns in the daytime. Here, we present a new method to extract time series of tropospheric vertical column densities (VCDs) of NO2 from these observations. The derived tropospheric NO2 VCDs are important quantities for the estimation of emissions and for the validation of satellite observations. Our method makes use of assumptions on the relative NO2 height profiles and the diurnal variation of stratospheric NO2 VCDs. The main error sources arise from the uncertainties in the estimated stratospheric slant column densities (SCDs) and the determination of tropospheric NO2 air mass factor (AMF). For a polluted site like Shanghai, the accuracy of our method is conservatively estimated to be <25% for solar zenith angle (SZA) lower than 70°. From simultaneously performed long-path DOAS measurements, the NO2 surface concentrations at the same site were observed and the corresponding tropospheric NO2 VCDs were estimated using the assumed seasonal NO2 profiles in the planetary boundary layer (PBL). By making a comparison between the tropospheric NO2 VCDs from zenith-sky and long-path DOAS measurements, it is found that the former provides more realistic information about total tropospheric pollution than the latter, so it's more suitable for satellite data validation. A comparison between the tropospheric NO2 VCDs from ground-based zenith-sky measurements and SCIAMACHY was also made. Satellite validation for a strongly polluted area is highly needed, but exhibits also a great challenge. Our comparison shows good agreement, considering in particular the different spatial resolutions between the two measurements. Remaining systematic deviations are most probably related to the uncertainties of satellite data caused by the assumptions on aerosol properties as well as the layer heights of aerosols and NO2.

Summary
Tropospheric NO2 column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation

Excerpt
Deutschmann, T. and Wagner, T.: TRACY-II Users manual, University of Heidelberg, 2006.; Bassford, M. R., McLinden, C. A., and Strong, K.: Zenith-sky observations of stratospheric gases: the sensitivity of air mass factors to geophysical parameters and the influence of tropospheric clouds, J. Quant. Spectrosc. Ra., 68, 657–677, 2001.; Beirle,~S., Platt,~U., Wenig,~M., and Wagner,~T.: Weekly cycle of NO2 by GOME measurements: a signature of anthropogenic sources, Atmos. Chem. Phys., 3, 2225–2232, 2003.; Beirle,~S., Platt,~U., Wenig,~M., and Wagner,~T.: Highly resolved global distribution of tropospheric NO2 using GOME narrow swath mode data, Atmos. Chem. Phys., 4, 1913–1924, 2004.; Boersma, K. F., Eskes, H. J., and Brinksma, E. J.: Error analysis for tropospheric NO2 retrieval from space, J. Geophys. Res., 109, D04311, doi:10.1029/2003JD003962, 2004.; Bovensmann, H., Burrows, J. P., Buchwitz, M., Frerick, J., No\el, S., Rozanov, V. V., Chance, K. V., and Goede, A. P. H.: SCIAMACHY: Mission Objectives and Measurement Modes, J. Atmos. Sci., 56(2), 127–150, 1999.; Brinksma, E. J., Pinardi, G., Braak, R., Volten, H., Richter, A., Schönhardt, A., van Roozendael, M., Fayt, C., Hermans, C., Dirksen, R. J., Vlemmix, T., Berkhout, A. J. C., Swart, D. P. J., Oetjen, H., Wittrock, F., Wagner, T., Ibrahim, O. W., de Leeuw, G., Moerman, M., Curier, R. L., Celarier, E. A., Knap, W. H., Veefkind, J. P., Eskes, H. J., Allaart, M., Rothe, R., Piters, A. J. M., and Levelt, P. F.: The 2005 and 2006 DANDELIONS NO2 and aerosol intercomparison campaigns, J. Geophys. Res., 113, D16, doi:10.1029/2007JD008808, 2008.; Burrows, J. P., Dehn, A., Deters, B., Himmelmann, S., Richter, A., Voigt, S., and Orphal, J.: Atmospheric remote-sensing reference data from GOME: part 1. Temperature-dependent absorption cross sections of NO2 in the 231–794 nm range, J. Quant. Spectrosc. Ra., 60(6), 1025–1031, 1998.; Burrows, J. P., Richter, A., Dehn, A., Deters, B., Himmelmann, S., Voigt, S., and Orphal, J.: Atmospheric remote-sensing reference data from GOME: part 2. Temperature-dependent absorption cross sections of O3 in the 231–794 nm range, J. Quant. Spectrosc. Ra., 61, 509–517, 1999a.; Cinzano, P, Falchi, F., and Elvidge, C. D.: The first world atlas of the artificial night sky brightness, Mon. Not. R. Astron. Soc., 328, 689–707, 2001.; Burrows, J. P., Weber, M., Buchwitz, M., Rozanov, V. V., Ladstätter-Weißenmayer, A., Richter, A., De Beek, R., Hoogen, R., Bramstedt, K., Eichmann, K. U., Eisinger, M., and Perner, D.: The Global Ozone Monitoring Experiment (GOME): Mission concept and first scientific results, J. Atmos. Sci., 56(2), 151–175, 1999b.; Cantrell, C. A.: Technical Note: Review of methods for linear least-squares fitting of data and application to atmospheric chemistry problems, Atmos. Chem. Phys., 8, 5477–5487, 2008.; Celarier, E. A., Brinksma, E. J., Gleason, J. F., Veefkind, J. P., Cede, A., Herman, J. R., Ionov, D., Goutail, F., Pommereau, J.-P., Lambert, J. -C., van Roozendael, M., Pinardi, G., Wittrock, F., Schönhardt, A., Richter, A., Ibrahim, O. W., Wagner, T., Bojkov, B., Mount, G., Spinei, E., Chen, C. M., Pongetti, T. J., Sander, S. P., Bucsela, E. J., Wenig, M. O., Swart, D. P. J., Volten, H., Kroon, M., and Levelt, P. F.: Validation of Ozone Monitoring Instrument nitrogen dioxide columns, J. Geophys. Res., 113, D15S15, doi:10.1029/2007JD008908, 2008.; Duan, J. and Mao, J. T.: Study on the distribution and variation trends of atmospheric aerosol optical depth over the Yangtze River Delta, Acta Scientiae Circumstantiae, 27(4), 537–543, 2007.; EUMETSAT: GOME-2 Products Guide, http://oiswww.eumetsat.org/WEBOPS/eps- pg/GOME-2/GOME2-PG-index.htm, 2008.; Fayt, C. and v. Roozendael, M.: WinDOAS 2.1 software user manual, IASB/BIRA Uccle, Belgium, 2001.; Greenblatt, G. D., Orlando, J. J., Burkholder, J. B., and Ravis

 

Click To View

Additional Books


  • Origin and Transport of Mediterranean Mo... (by )
  • Contribution of Sulfuric Acid and Oxidiz... (by )
  • Corrigendum to in Situ Vertical Profiles... (by )
  • An Extreme Co Pollution Event Over Indon... (by )
  • Modelling the Budget of Middle Atmospher... (by )
  • Near-uv Photolysis Cross Sections of Ch3... (by )
  • Spectral Optical Properties of Long-rang... (by )
  • Real-time Observation of Secondary Aeros... (by )
  • Assessment of Atmospheric Processes Driv... (by )
  • A Comparison Study Between Cmaq-simulate... (by )
  • Downscaling of Meteosat Seviri 0.6 and 0... (by )
  • Oh and Ho2 Chemistry in Clean Marine Air... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.