@article{fdi:010077452,
  title = {{B}iomass burning and urban emission impacts in the {A}ndes {C}ordillera region based on in situ measurements from the {C}hacaltaya observatory, {B}olivia (5240 m a.s.l.)},
  author = {{C}hauvigne, {A}. and {A}liaga, {D}. and {S}ellegri, {K}. and {M}ontoux, {N}. and {K}rejci, {R}. and {M}ocnik, {G}. and {M}oreno, {I}. and {M}uler, {T}. and {P}andolfi, {M}. and {V}elarde, {F}. and {W}einhold, {K}. and {G}inot, {P}atrick and {W}iedensohler, {A}. and {A}ndrade, {M}. and {L}aj, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his study documents and analyses a 4-year continuous record of aerosol optical properties measured at the {G}lobal {A}tmosphere {W}atch ({GAW}) station of {C}hacaltaya ({CHC}; 5240 m a.s.l.), in {B}olivia. {R}ecords of particle light scattering and particle light absorption coefficients are used to investigate how the high {A}ndean {C}ordillera is affected by both long-range transport and by the fast-growing agglomeration of {L}a {P}az-{E}l {A}lto, located approximately 20 km away and 1.5 km below the sampling site. {T}he extended multiyear record allows us to study the properties of aerosol particles for different air mass types, during wet and dry seasons, also covering periods when the site was affected by biomass burning in the {B}olivian lowlands and the {A}mazon {B}asin. {T}he absorption, scattering, and extinction coefficients (median annual values of 0.74, 12.14, and 12.96 {M}m(-1) respectively) show a clear seasonal variation with low values during the wet season (0.57, 7.94, and 8.68 {M}m(-1) respectively) and higher values during the dry season (0.80, 11.23, and 14.51 {M}m(-1) respectively). {T}he record is driven by variability at both seasonal and diurnal scales. {A}t a diurnal scale, all records of intensive and extensive aerosol properties show a pronounced variation (daytime maximum, night-time minimum), as a result of the dynamic and convective effects. {T}he particle light absorption, scattering, and extinction coefficients are on average 1.94, 1.49, and 1.55 times higher respectively in the turbulent thermally driven conditions than the more stable conditions, due to more efficient transport from the boundary layer. {R}etrieved intensive optical properties are significantly different from one season to the other, reflecting the changing aerosol emission sources of aerosol at a larger scale. {U}sing the wavelength dependence of aerosol particle optical properties, we discriminated between contributions from natural (mainly mineral dust) and anthropogenic (mainly biomass burning and urban transport or industries) emissions according to seasons and local circulation. {T}he main sources influencing measurements at {CHC} are from the urban area of {L}a {P}az-{E}l {A}lto in the {A}ltiplano and from regional biomass burning in the {A}mazon {B}asin. {R}esults show a 28 % to 80 % increase in the extinction coefficients during the biomass burning season with respect to the dry season, which is observed in both tropospheric dynamic conditions. {F}rom this analysis, long-term observations at {CHC} provide the first direct evidence of the impact of biomass burning emissions of the {A}mazon {B}asin and urban emissions from the {L}a {P}az area on atmospheric optical properties at a remote site all the way to the free troposphere.},
  keywords = {{BOLIVIE} ; {ANDES} ; {LA} {PAZ} {PLATEAU} ; {LA} {PLATA} {BASSIN} ; {AMAZONIE} ; {AMAZONE} {BASSIN}},
  booktitle = {},
  journal = {{A}tmospheric {C}hemistry and {P}hysics},
  volume = {19},
  numero = {23},
  pages = {14805--14824},
  ISSN = {1680-7316},
  year = {2019},
  DOI = {10.5194/acp-19-14805-2019},
  URL = {https://www.documentation.ird.fr/hor/fdi:010077452},
}