Mass and isotopic concentrations of water-insoluble refractory carbon in total suspended particulates at Mt. Waliguan Observatory (China)--颗粒学报PARTICUOLOGY

Zheng, X., Shen, C., Wan, G., Tang, J., & Liu, K. (2015). Mass and isotopic concentrations of water-insoluble refractory carbon in total suspended particulates at Mt. Waliguan Observatory (China). Particuology, 20, 24–31. https://doi.org/10.1016/j.partic.2014.11.003

Mass and isotopic concentrations of water-insoluble refractory carbon in total suspended particulates at Mt. Waliguan Observatory (China)

Xiangdong Zheng ^a *, Chengde Shen ^b, Guojiang Wan ^c, Jie Tang ^d, Kexin Liu ^e

a Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing 100081, China
b State Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
c State Key Laboratory of Environment Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
d Center of Meteorological Sounding, Chinese Meteorological Administration, Beijing 100081, China
e State Key Laboratory of Nuclear Physics and Technology and Institute of Heavy Ion Physics, Peking University, Beijing 100871, China

10.1016/j.partic.2014.11.003

Volume 20, June 2015, Pages 24-31

Received 25 May 2014, Revised 31 October 2014, Accepted 4 November 2014, Available online 23 January 2015.

E-mail: zhengxd@cams.cma.gov.cn

Highlights

• Weekly variations of WIRC mass concentrations were agreeable with those of aethalometer BC.

• WIRC mass concentrations were higher than those of aethalometer BC.

• WIRC δ¹³C PDB was (−25.3 ± 0.8)‰ (n = 79) with little seasonality.

• WIRC ¹⁴C pMC ((67.2 ± 7.7)%, n = 29) provided signatures of different air mass transport paths.

Abstract

Mass concentration and isotopic values δ¹³C and ¹⁴C are presented for the water-insoluble refractory carbon (WIRC) component of total suspended particulates (TSP), collected weekly during 2003, as well as from October 2005 to May 2006 at the WMO-GAW Mt. Waliguan (WLG) site. The overall average WIRC mass concentration was (1183 ± 120) ng/m³ (n = 79), while seasonal averages were 2081 ± 1707 (spring), 454 ± 205 (summer), 650 ± 411 (autumn), and 1019 ± 703 (winter) ng/m³. Seasonal variations in WIRC mass concentrations were consistent with black carbon measurements from an aethalometer, although WIRC concentrations were typically higher, especially in winter and spring. The δ¹³C PDB value (−25.3 ± 0.8)‰ determined for WIRC suggests that its sources are C₃ biomass or fossil fuel combustion. No seasonal change in δ¹³C PDB was evident. The average percent Modern Carbon (pMC) for ¹⁴C in WIRC for winter and spring was (67.2 ± 7.7)% (n = 29). Lower pMC values were associated with air masses transported from the area east of WLG, while higher pMC values were associated with air masses from the Tibetan Plateau, southwest of WLG. Elevated pMC values with abnormally high mass concentrations of TSP and WIRC were measured during a dust storm event.

Graphical abstract

Keywords

Water-insoluble refractory carbon (WIRC); Mass concentration; δ¹³C; ¹⁴C; Mt. Waliguan (WLG)

文章导读