Source apportionment of black carbon (BC) from fossil fuel and biomass burning in metropolitan Milan, Italy

Amirhosein Mousavi, Mohammad H. Sowlat, Christopher Lovett, Martin Rauber, Soenke Szidat, Roberto Boffi, Alessandro Borgini, Cinzia De Marco, Ario A. Ruprecht, Constantinos Sioutas

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this study, the temporal variations of sources of black carbon (BC) concentrations were evaluated in the metropolitan area of Milan, Italy, during three distinct seasons over 2017–2018. We measured BC concentrations using Aethalometers at two sampling sites, one in the city center of Milan, and one in the less densely populated suburb of Bareggio, approximately 14 km to the west of Milan's urban center. PM samples were also collected for elemental carbon (EC) and 14C analyses. The Aethalometer model was used to apportion BC concentrations to the fossil fuel combustion (BCff) and biomass burning (BCbb) originated BC. Additionally, radiocarbon 14C analysis was performed on the PM samples, allowing us to refine our estimates of the contributions of both BCff and BCbb to total BC concentrations and assess the dependence of the mass absorption cross section (MAC) of BC on its source. Overall, our results indicated that the annually averaged BC concentrations were higher at the Bareggio site (2763 ± 1050 ng m−3) than at the Milan site (1921 ± 876 ng m−3). The Aethalometer model results demonstrated that in all of the sampling seasons, fossil-fuel-originated BC (BCff) concentrations were slightly higher in Milan (e.g., a summertime average of 1045 ± 150 ng/m3) than in Bareggio (e.g., a summertime average of 940 ± 89 ng/m3); however, black carbon (BCbb) concentrations from biomass burning were considerably higher at Bareggio (e.g., a wintertime average of 3284 ± 713 ng/m3) than in Milan (e.g., a wintertime average of 1154 ± 103 ng/m3). Diurnal variation plots indicated that both in Milan and Bareggio, BCff peaked during the morning and, to a lesser extent, afternoon traffic rush hours, while BCbb peaked during nighttime when residential wood burning for heating purposes is prominent. Our results also highlight the significant impact of residential wood burning on ambient BC concentrations in the Milan metropolitan area.

Original languageEnglish
Pages (from-to)252-261
Number of pages10
JournalAtmospheric Environment
Volume203
DOIs
Publication statusPublished - Apr 15 2019

Fingerprint

black carbon
biomass burning
fossil fuel
metropolitan area
source apportionment
sampling
diurnal variation
temporal variation
cross section
combustion
heating
carbon

Keywords

  • Biomass burning
  • Black carbon
  • Fossil fuel
  • Milan
  • Po valley
  • Source apportionment

ASJC Scopus subject areas

  • Environmental Science(all)
  • Atmospheric Science

Cite this

Source apportionment of black carbon (BC) from fossil fuel and biomass burning in metropolitan Milan, Italy. / Mousavi, Amirhosein; Sowlat, Mohammad H.; Lovett, Christopher; Rauber, Martin; Szidat, Soenke; Boffi, Roberto; Borgini, Alessandro; De Marco, Cinzia; Ruprecht, Ario A.; Sioutas, Constantinos.

In: Atmospheric Environment, Vol. 203, 15.04.2019, p. 252-261.

Research output: Contribution to journalArticle

Mousavi, Amirhosein ; Sowlat, Mohammad H. ; Lovett, Christopher ; Rauber, Martin ; Szidat, Soenke ; Boffi, Roberto ; Borgini, Alessandro ; De Marco, Cinzia ; Ruprecht, Ario A. ; Sioutas, Constantinos. / Source apportionment of black carbon (BC) from fossil fuel and biomass burning in metropolitan Milan, Italy. In: Atmospheric Environment. 2019 ; Vol. 203. pp. 252-261.
@article{ef877ba0e7614ab5a5bdaa837c952d41,
title = "Source apportionment of black carbon (BC) from fossil fuel and biomass burning in metropolitan Milan, Italy",
abstract = "In this study, the temporal variations of sources of black carbon (BC) concentrations were evaluated in the metropolitan area of Milan, Italy, during three distinct seasons over 2017–2018. We measured BC concentrations using Aethalometers at two sampling sites, one in the city center of Milan, and one in the less densely populated suburb of Bareggio, approximately 14 km to the west of Milan's urban center. PM samples were also collected for elemental carbon (EC) and 14C analyses. The Aethalometer model was used to apportion BC concentrations to the fossil fuel combustion (BCff) and biomass burning (BCbb) originated BC. Additionally, radiocarbon 14C analysis was performed on the PM samples, allowing us to refine our estimates of the contributions of both BCff and BCbb to total BC concentrations and assess the dependence of the mass absorption cross section (MAC) of BC on its source. Overall, our results indicated that the annually averaged BC concentrations were higher at the Bareggio site (2763 ± 1050 ng m−3) than at the Milan site (1921 ± 876 ng m−3). The Aethalometer model results demonstrated that in all of the sampling seasons, fossil-fuel-originated BC (BCff) concentrations were slightly higher in Milan (e.g., a summertime average of 1045 ± 150 ng/m3) than in Bareggio (e.g., a summertime average of 940 ± 89 ng/m3); however, black carbon (BCbb) concentrations from biomass burning were considerably higher at Bareggio (e.g., a wintertime average of 3284 ± 713 ng/m3) than in Milan (e.g., a wintertime average of 1154 ± 103 ng/m3). Diurnal variation plots indicated that both in Milan and Bareggio, BCff peaked during the morning and, to a lesser extent, afternoon traffic rush hours, while BCbb peaked during nighttime when residential wood burning for heating purposes is prominent. Our results also highlight the significant impact of residential wood burning on ambient BC concentrations in the Milan metropolitan area.",
keywords = "Biomass burning, Black carbon, Fossil fuel, Milan, Po valley, Source apportionment",
author = "Amirhosein Mousavi and Sowlat, {Mohammad H.} and Christopher Lovett and Martin Rauber and Soenke Szidat and Roberto Boffi and Alessandro Borgini and {De Marco}, Cinzia and Ruprecht, {Ario A.} and Constantinos Sioutas",
year = "2019",
month = "4",
day = "15",
doi = "10.1016/j.atmosenv.2019.02.009",
language = "English",
volume = "203",
pages = "252--261",
journal = "Atmospheric Environment",
issn = "1352-2310",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Source apportionment of black carbon (BC) from fossil fuel and biomass burning in metropolitan Milan, Italy

AU - Mousavi, Amirhosein

AU - Sowlat, Mohammad H.

AU - Lovett, Christopher

AU - Rauber, Martin

AU - Szidat, Soenke

AU - Boffi, Roberto

AU - Borgini, Alessandro

AU - De Marco, Cinzia

AU - Ruprecht, Ario A.

AU - Sioutas, Constantinos

PY - 2019/4/15

Y1 - 2019/4/15

N2 - In this study, the temporal variations of sources of black carbon (BC) concentrations were evaluated in the metropolitan area of Milan, Italy, during three distinct seasons over 2017–2018. We measured BC concentrations using Aethalometers at two sampling sites, one in the city center of Milan, and one in the less densely populated suburb of Bareggio, approximately 14 km to the west of Milan's urban center. PM samples were also collected for elemental carbon (EC) and 14C analyses. The Aethalometer model was used to apportion BC concentrations to the fossil fuel combustion (BCff) and biomass burning (BCbb) originated BC. Additionally, radiocarbon 14C analysis was performed on the PM samples, allowing us to refine our estimates of the contributions of both BCff and BCbb to total BC concentrations and assess the dependence of the mass absorption cross section (MAC) of BC on its source. Overall, our results indicated that the annually averaged BC concentrations were higher at the Bareggio site (2763 ± 1050 ng m−3) than at the Milan site (1921 ± 876 ng m−3). The Aethalometer model results demonstrated that in all of the sampling seasons, fossil-fuel-originated BC (BCff) concentrations were slightly higher in Milan (e.g., a summertime average of 1045 ± 150 ng/m3) than in Bareggio (e.g., a summertime average of 940 ± 89 ng/m3); however, black carbon (BCbb) concentrations from biomass burning were considerably higher at Bareggio (e.g., a wintertime average of 3284 ± 713 ng/m3) than in Milan (e.g., a wintertime average of 1154 ± 103 ng/m3). Diurnal variation plots indicated that both in Milan and Bareggio, BCff peaked during the morning and, to a lesser extent, afternoon traffic rush hours, while BCbb peaked during nighttime when residential wood burning for heating purposes is prominent. Our results also highlight the significant impact of residential wood burning on ambient BC concentrations in the Milan metropolitan area.

AB - In this study, the temporal variations of sources of black carbon (BC) concentrations were evaluated in the metropolitan area of Milan, Italy, during three distinct seasons over 2017–2018. We measured BC concentrations using Aethalometers at two sampling sites, one in the city center of Milan, and one in the less densely populated suburb of Bareggio, approximately 14 km to the west of Milan's urban center. PM samples were also collected for elemental carbon (EC) and 14C analyses. The Aethalometer model was used to apportion BC concentrations to the fossil fuel combustion (BCff) and biomass burning (BCbb) originated BC. Additionally, radiocarbon 14C analysis was performed on the PM samples, allowing us to refine our estimates of the contributions of both BCff and BCbb to total BC concentrations and assess the dependence of the mass absorption cross section (MAC) of BC on its source. Overall, our results indicated that the annually averaged BC concentrations were higher at the Bareggio site (2763 ± 1050 ng m−3) than at the Milan site (1921 ± 876 ng m−3). The Aethalometer model results demonstrated that in all of the sampling seasons, fossil-fuel-originated BC (BCff) concentrations were slightly higher in Milan (e.g., a summertime average of 1045 ± 150 ng/m3) than in Bareggio (e.g., a summertime average of 940 ± 89 ng/m3); however, black carbon (BCbb) concentrations from biomass burning were considerably higher at Bareggio (e.g., a wintertime average of 3284 ± 713 ng/m3) than in Milan (e.g., a wintertime average of 1154 ± 103 ng/m3). Diurnal variation plots indicated that both in Milan and Bareggio, BCff peaked during the morning and, to a lesser extent, afternoon traffic rush hours, while BCbb peaked during nighttime when residential wood burning for heating purposes is prominent. Our results also highlight the significant impact of residential wood burning on ambient BC concentrations in the Milan metropolitan area.

KW - Biomass burning

KW - Black carbon

KW - Fossil fuel

KW - Milan

KW - Po valley

KW - Source apportionment

UR - http://www.scopus.com/inward/record.url?scp=85061804555&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85061804555&partnerID=8YFLogxK

U2 - 10.1016/j.atmosenv.2019.02.009

DO - 10.1016/j.atmosenv.2019.02.009

M3 - Article

AN - SCOPUS:85061804555

VL - 203

SP - 252

EP - 261

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

ER -