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

Journal metrics

IF value: 3.668
IF3.668
IF 5-year value: 3.707
IF 5-year
3.707
CiteScore value: 6.3
CiteScore
6.3
SNIP value: 1.383
SNIP1.383
IPP value: 3.75
IPP3.75
SJR value: 1.525
SJR1.525
Scimago H <br class='widget-line-break'>index value: 77
Scimago H
index
77
h5-index value: 49
h5-index49
Preprints
https://doi.org/10.5194/amt-2020-341
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-341
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  09 Nov 2020

09 Nov 2020

Review status
This preprint is currently under review for the journal AMT.

Highly time-resolved characterization of carbonaceous aerosols using a two-wavelength Sunset thermo/optical carbon analyzer

Mengying Bao1,2,3, Yan-Lin Zhang1,2,3, Fang Cao1,2,3, Yu-Chi Lin1,2,3, Yuhang Wang4, Xiaoyan Liu1,2,3, Wenqi Zhang1,2,3, Meiyi Fan1,2,3, Feng Xie1,2,3, Robert Cary5, Joshua Dixon5, and Lihua Zhou6 Mengying Bao et al.
  • 1Yale-NUIST Center on Atmospheric Environment, Joint International Research Laboratory of Climate and Environment Change (ILCEC), Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 2Key Laboratory of Meteorological Disaster Ministry of Education (KLME), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 3School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 4School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta 30332, USA
  • 5Sunset Laboratory, 1080 SW Nimbus Avenue, Suite J/5 Tigard, OR 97223, USA
  • 6College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China

Abstract. Carbonaceous aerosols have great influence on the air quality, human health and climate change. Except for organic carbon (OC) and elemental carbon (EC), brown carbon (BrC), mainly originates from biomass burning, as a group of OC with strong absorption from the visible to near-ultraviolet wavelengths, makes a considerable contribution to global warming. Large amounts of studies have reported long-term observation of OC and EC concentrations throughout the word, but studies of BrC based on long-term observations are rather limited. In this study, we established a two-wavelength method (658 nm and 405 nm) applied in the Sunset thermo/optical carbon analyzer. Based on one-year observation, we firstly investigated the characteristics, meteorological impact and transport process of OC and EC. Due to BrC absorbs light at 405 nm more effectively than 658 nm, we defined the enhanced concentrations (dEC = EC405 nm−EC658 nm) and gave the possibility to provide an indicator of BrC. The receptor model and MODIS fire information were used to identify the presence of BrC aerosols. Our results showed that the carbonaceous aerosols concentrations were highest in winter and lowest in summer. Traffic emission was an important source of carbonaceous aerosols in Nanjing. Receptor model results showed that strong local emissions were found in OC and EC aerosols, however dEC aerosols were significantly affected by regional or long-range transport. The dEC / OC and OC / EC ratios showed similar diurnal patterns and the dEC / OC increased when the OC / EC ratios increased, indicating strong secondary sources or biomass burning contributions to dEC. Two biomass burning events both in summer and winter were analyzed and the results showed that the dEC concentrations were obvious higher in biomass burning days, however, no similar levels of the OC and EC concentrations were found both in biomass burning days and normal days in summer, suggesting that biomass burning emission made a great contribution to dEC and the sources of OC and EC were more complicated. Large number of open fire counts from the northwest and southwest areas of the study site were monitored in winter, significantly contributed to OC, EC and dEC. In addition, the near-by YRD area was one of the main potential source areas of dEC, suggesting that anthropogenic emissions could also be important sources of dEC. The results proved that dEC can be an indicator of BrC in biomass burning days. Our modified two-wavelength instrument provided more information than traditional single-wavelength thermo/optical carbon analyzer and gave a new idea about the measurement of BrC, the application of dEC data need to be further investigated.

Mengying Bao et al.

Interactive discussion

Status: open (until 04 Jan 2021)
Status: open (until 04 Jan 2021)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Mengying Bao et al.

Mengying Bao et al.

Viewed

Total article views: 75 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
60 15 0 75 8 1 1
  • HTML: 60
  • PDF: 15
  • XML: 0
  • Total: 75
  • Supplement: 8
  • BibTeX: 1
  • EndNote: 1
Views and downloads (calculated since 09 Nov 2020)
Cumulative views and downloads (calculated since 09 Nov 2020)

Viewed (geographical distribution)

Total article views: 79 (including HTML, PDF, and XML) Thereof 78 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 29 Nov 2020
Publications Copernicus
Download
Short summary
We introduced a two-wavelength method by modifying the Sunset carbon analyzer. We defined the enhanced concentrations (dEC = EC405 nm−EC658 nm) and gave the possibility to provide an indicator of BrC. Compared with the strong local sources of OC and EC, we found that dEC mainly originated from regional transport. Biomass burning emissions significantly contributed to high dEC concentrations during the heavily biomass burning periods. This study provided a new idea about the measurement of BrC.
We introduced a two-wavelength method by modifying the Sunset carbon analyzer. We defined the...
Citation