Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/7008
Title: Asian dust storm observed at a rural mountain site in southern China : chemical evolution and heterogeneous photochemistry
Authors: Nie, W
Wang, T 
Xue, L
Ding, AJ
Wang, X
Gao, X
Xu, Z
Yu, YC
Yuan, C
Zhou, ZS
Gao, R
Liu, XH
Wang, Y
Fan, SJ
Poon, S
Zhang, Q
Wang, W
Keywords: Aerosol
Atmospheric transport
Chemical composition
Dust storm
Heterogeneous medium
Mountain region
Nitrite
Photochemistry
Radiation balance
Trace gas
Issue Date: 17-Dec-2012
Publisher: Copernicus GmbH
Source: Atmospheric chemistry and physics, 17 Dec. 2012, v. 12, no. 24, p. 11985-11995 How to cite?
Journal: Atmospheric chemistry and physics 
Abstract: Heterogeneous processes on dust particles are important for understanding the chemistry and radiative balance of the atmosphere. This paper investigates an intense Asian dust storm episode observed at Mount Heng (1269 m a.s.l.) in southern China on 24–26 April 2009. A set of aerosol and trace gas data collected during the study was analyzed to investigate their chemical evolution and heterogeneous photochemistry as the dust traveled to southern China. Results show that the mineral dust arriving at Mt. Heng experienced significant modifications during transport, with large enrichments in secondary species (sulfate, nitrate, and ammonium) compared with the dust composition collected at an upwind mountain top site (Mount Hua). A photochemical age "clock" (−Log ₁₀(NO[sub x]/NO[sub y])) was employed to quantify the atmospheric processing time. The result indicates an obvious increase in the abundance of secondary water-soluble ions in dust particles with the air mass atmospheric processing time. Based on the observations, a 4-stage evolution process is proposed for carbonate-containing Asian dust, starting from fresh dust to particles coated with hydrophilic and acidic materials. Daytime-enhanced nitrite formation on the dust particles was also observed, which indicates the recent laboratory result of the TiO ₂ photocatalysis of NO ₂ as a potential source of nitrite and nitrous acid. (See Article file for details of the abstract.)
URI: http://hdl.handle.net/10397/7008
ISSN: 1680-7316
EISSN: 1680-7324
DOI: 10.5194/acp-12-11985-2012
Rights: © Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License.
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Nie_asian_dust_storm.pdf3.09 MBAdobe PDFView/Open
Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

20
Last Week
0
Last month
2
Citations as of Sep 25, 2017

WEB OF SCIENCETM
Citations

20
Last Week
0
Last month
0
Citations as of Sep 21, 2017

Page view(s)

213
Last Week
19
Last month
Checked on Sep 24, 2017

Download(s)

82
Checked on Sep 24, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.