Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.668 IF 5.668
  • IF 5-year value: 6.201 IF 5-year
  • CiteScore value: 6.13 CiteScore
  • SNIP value: 1.633 SNIP 1.633
  • IPP value: 5.91 IPP 5.91
  • SJR value: 2.938 SJR 2.938
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 174 Scimago H
    index 174
  • h5-index value: 87 h5-index 87
Discussion papers
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 15 Jul 2019

Submitted as: research article | 15 Jul 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Biomass-burning and urban emission impacts in the Andes Cordillera region based on in-situ measurements from the Chacaltaya observatory, Bolivia (5240 m a.s.l.)

Chauvigné Aurélien1, Diego Aliaga2, Marcos Andrade2, Patrick Ginot3, Radovan Krejci4, Griša Močnik5, Nadège Montoux1, Isabel Moreno2, Thomas Müller6, Marco Pandolfi7, Karine Sellegri1, Fernando Velarde2, Alfred Wiedensohler6, Kay Weinhold6, and Paolo Laj3,8,9 Chauvigné Aurélien et al.
  • 1Laboratoire de Météorologie Physique, OPGC, CNRS UMR6016, Université d'Auvergne, Clermont-Ferrand, France
  • 2Laboratorio de Física de la Atmósfera, Universidad Mayor de San Andrés, La Paz, Bolivia
  • 3Univ-Grenoble-Alpes, CNRS, IRD, Grenoble-INP, IGE, 38000 Grenoble, France
  • 4Department of Environmental Science and Analytical Chemistry & Bolin Centre of Climate Research, Stockholm University, Stockholm 10691, Sweden
  • 5Condensed Matter Physics Department, Jožef Stefan Institute, Ljubljana, Slovenia
  • 6Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
  • 7Institute of Environmental Assessment and Water Research, c/Jordi-Girona 18–26, 08034, Barcelona, Spain
  • 8CNR-ISAC, National Research Council of Italy – Institute of Atmospheric Sciences and Climate, Bologna, Italy
  • 9University of Helsinki, Atmospheric Science division, Helsinki, Finland

Abstract. We present the variability of aerosol particle optical properties measured at the global Atmosphere Watch (GAW) station Chacaltaya (5240 m a.s.l.). The in-situ mountain site is ideally located to study regional impacts of the densely populated urban area of La Paz/El Alto, and the intensive activity in the Amazonian basin. Four year measurements allow to study aerosol particle properties for distinct atmospheric conditions as stable and turbulent layers, different airmass origins, as well as for wet and dry seasons, including biomass-burning influenced periods. The absorption, scattering and extinction coefficients (median annual values of 0.74, 12.14 and 12.96 Mm−1 respectively) show a clear seasonal variation with low values during the wet season (0.57, 7.94 and 8.68 Mm−1 respectively) and higher values during the dry season (0.80, 11.23 and 14.51 Mm−1 respectively). These parameters also show a pronounced diurnal variation (maximum during daytime, minimum during night-time, as a result of the dynamic and convective effects of leading to lower atmospheric layers reaching the site during daytime. Retrieved intensive optical properties are significantly different from one season to the other, showing the influence of different sources of aerosols according to the season. Both intensive and extensive optical properties of aerosols were found to be different among the different atmospheric layers. The particle light absorption, scattering and extinction coefficients are in average 1.94, 1.49 and 1.55 times higher, respectively, in the turbulent layer compared to the stable layer. We observe that the difference is highest during the wet season and lowest during the dry season. Using wavelength dependence of aerosol particle optical properties, we discriminated contributions from natural (mainly mineral dust) and anthropogenic (mainly biomass-burning and urban transport or industries) emissions according to seasons and tropospheric layers. The main sources influencing measurements at CHC are arising from the urban area of La Paz/El Alto, and regional biomass-burning from the Amazonian basin. Results show a 28 % to 80 % increase of the extinction coefficients during the biomass-burning season with respect to the dry season, which is observed in both tropospheric layers. From this analyse, long-term observations at CHC provides the first direct evidence of the impact of emissions in the Amazonian basin on atmospheric optical properties far away from their sources, all the way to the stable layer.

Chauvigné Aurélien et al.
Interactive discussion
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Login for Authors/Co-Editors] [Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
Chauvigné Aurélien et al.
Chauvigné Aurélien et al.
Total article views: 360 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
272 85 3 360 1 7
  • HTML: 272
  • PDF: 85
  • XML: 3
  • Total: 360
  • BibTeX: 1
  • EndNote: 7
Views and downloads (calculated since 15 Jul 2019)
Cumulative views and downloads (calculated since 15 Jul 2019)
Viewed (geographical distribution)  
Total article views: 328 (including HTML, PDF, and XML) Thereof 328 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
No saved metrics found.
No discussed metrics found.
Latest update: 14 Oct 2019
Publications Copernicus
Short summary
The study presents for the first time the analyse of aerosol optical properties in the unique high altitude station of Chacaltaya, Bolivia. Ideally located, the station allows to better understand influences of urban area and the Amazonian forest on the tropospheric properties. An emerging method is applied to characterize aerosol origins, and permits to illustrate evidences of natural and anthropogenic influences.
The study presents for the first time the analyse of aerosol optical properties in the unique...