Measurement report: Size-resolved mass concentration of equivalent black carbon-containing particles larger than 700 nm and their role in radiation

Abstract > 700 > 700 µ m was measured at high time resolution of 1 h for the first time by an aerodynamic aerosol classifier in tandem with an aethalometer in two field campaigns over eastern China, namely Changzhou located in the Yangtze River Delta and Beijing located in the North China Plain. The results revealed that the pattern of eBCMSD in Changzhou (Beijing) was mostly bimodal (unimodal) peaking at 240 and 1249 nm (427 nm). The peak diameter of eBCMSD in Changzhou did not shift significantly with increasing pollution (240 to 289 nm). In contrast, the peak diameter of eBCMSD in Beijing shifted towards larger sizes, from 347 to 527 nm, with increasing pollution, indicating that the aging process at the urban site was different from that at the regional background site. eBCMSD in both Changzhou and Beijing had a significant diurnal cycle with a smaller (larger) value of eBCMSD during daytime (nighttime). Equivalent BC> 700 > 700 > 700 m eBC, bulk), bulk absorption coefficient (σ ab, bulk) and estimated direct radiative forcing of eBC (DRFeBC) in Changzhou and Beijing were 27.8 % (20.9 %–36.5 %) and 24.1 % (17.5 %–34.2 %), 19.6 % (15.8 %–24.6 %) and 25.9 % (19.6 %–33.7 %) and 20.5 % (18.4 %–22.2 %) and 21.0 % (16.3 %–26.1 %), respectively. m eBC, bulk, σ ab, bulk and DRFeBC of eBC> 700 µ g m - 3, by a factor of 3.2 (5.5) from 0.54 (0.63) to 1.75 (3.45) Mm- 1 - 2 > 700 m eBC, bulk and σ ab, bulk had a significant diurnal cycle with a higher (lower) fraction during daytime (nighttime) in both Changzhou and Beijing. A case study indicated that the contribution of eBC> 700 m eBC, bulk, σ ab, bulk and DRFeBC could reach up to 50 %, 50 % and 40 %, respectively. It was highly recommended to consider the whole size range of BC-containing particles in model estimation of the BC radiative effect.

Angaben zum Objekt

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Measurement report: Size-resolved mass concentration of equivalent black carbon-containing particles larger than 700 nm and their role in radiation ; volume:23 ; number:23 ; year:2023 ; pages:14889-14902 ; extent:14 ; Atmospheric chemistry and physics ; 23, Heft 23 (2023), 14889-14902 (gesamt 14)

Beteiligte, Orts- und Zeitangaben

• Urheber: Zhao, Weilun ; Li, Ying ; Zhao, Gang ; Guo, Song ; Ma, Nan ; Hu, Shuya ; Zhao, Chunsheng

Weitere Informationen

• DOI: 10.5194/acp-23-14889-2023
• URN: urn:nbn:de:101:1-2023120703413839884936
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Letzte Aktualisierung: 15.08.2025, 07:27 MESZ