Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

Journal metrics

  • IF value: 2.989 IF 2.989
  • IF 5-year<br/> value: 3.489 IF 5-year
    3.489
  • CiteScore<br/> value: 3.37 CiteScore
    3.37
  • SNIP value: 1.273 SNIP 1.273
  • SJR value: 2.026 SJR 2.026
  • IPP value: 3.082 IPP 3.082
  • h5-index value: 45 h5-index 45
doi:10.5194/amt-2016-319
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
10 Oct 2016
Review status
A revision of this discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Development of a portable Cavity Enhanced Absorption Spectrometer for the measurement of ambient N2O5: experimental setup, lab characterizations, and field applications under polluted urban environment
Haichao Wang1, Jun Chen2, and Keding Lu1 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China
2Institute of Particle and Two-Phase Flow Measurement, College of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, China
Abstract. A small and portable incoherent broadband cavity enhanced absorption spectrometer (IBBCEAS) for the dinitrogen pentoxide (N2O5) measurement has been developed. The instrument is featured with a mechanically aligned nonadjustable optical mounting system. To minimize the influence of the aerosol extinction and strong nonlinear absorption by water vapor, a dynamic reference spectrum with NO titration is used for the spectrum analysis. The range of spectrum fitting is 640–680 nm. Moreover, the wall losses of NO3 and N2O5 on the surface of the inlet and cavity tubes were extensively characterized. We determined that the surface reactivity for the heated PFA materials toward NO3 and N2O5 is 0.16 s−1 ± 0.04 s−1 and 0.019 s−1 ± 0.004 s−1, respectively. The N2O5 transmission efficiencies over the filter is 93 % (± 3 %). For the typical field experimental set up we used, the total transmission efficiency is about 82.9 %, the optimal limit of the detection (LOD) is estimated as 1.9 ppt (1σ) at 50 s intervals, the total uncertainty of the N2O5 measurement is 15 %, which is dominated by the uncertainty of the NO3 cross section calculated for 353 K in this system. Our instrument has been successfully deployed in two comprehensive field campaigns conducted in northern rural areas of Beijing in 2016. In both campaigns, the new design of the optical mounting system enabled us a fast setup and stable running of the IBBCEAS system for the detection of N2O5. High concentrations of N2O5. up to 1 ppb were detected for the two campaigns indicating an active nighttime chemistry presented in rural Beijing.

Citation: Wang, H., Chen, J., and Lu, K.: Development of a portable Cavity Enhanced Absorption Spectrometer for the measurement of ambient N2O5: experimental setup, lab characterizations, and field applications under polluted urban environment, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-319, in review, 2016.
Haichao Wang et al.
Haichao Wang et al.
Haichao Wang et al.

Viewed

Total article views: 300 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
248 42 10 300 12 7

Views and downloads (calculated since 10 Oct 2016)

Cumulative views and downloads (calculated since 10 Oct 2016)

Viewed (geographical distribution)

Total article views: 300 (including HTML, PDF, and XML)

Thereof 297 with geography defined and 3 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 26 Mar 2017
Publications Copernicus
Download
Short summary
A new Incoherent Broad Band Cavity Enhanced Absorption Spectrometer for ambient N2O5 detection is developed. This new instrument is featured with a mechanically aligned nonadjustable optical mounting system. Fast setup and stable running of this N2O5 spectrometer were successfully achieved during recent field campaigns in China due to this new feature. In addition, a dynamic reference spectrum is used for the CEAS type of instrument by NO titration for the first time as normally used by CRDs.
A new Incoherent Broad Band Cavity Enhanced Absorption Spectrometer for ambient N2O5 detection...
Share