Regional Differences of Chemical Composition and Optical Properties of Aerosols in the Tibetan Plateau

Xu, Jianzhong; Hettiyadura, Anusha Priyadarshani Silva; Liu, Yanmei; Zhang, Xinghua; Kang, Shichang; Laskin, Alexander

doi:10.1029/2019JD031226

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Regional Differences of Chemical Composition and Optical Properties of Aerosols in the Tibetan Plateau

2020
By Xu, Jianzhong ; Hettiyadura, Anusha Priyadarshani Silva ; Liu, Yanmei ; ...
Source: JGR Atmospheres 125(1): e2019JD031226

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Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Xu, Jianzhong ; Hettiyadura, Anusha Priyadarshani Silva ; Liu, Yanmei ; Zhang, Xinghua ; Kang, Shichang ; ... More +

Xu, Jianzhong ; Hettiyadura, Anusha Priyadarshani Silva ; Liu, Yanmei ; Zhang, Xinghua ; Kang, Shichang ; Laskin, Alexander Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

In this study, PM2.5 filter samples were collected from two high-elevation sites located in the southern and northern areas of Tibetan Plateau (TP): the Qomolangma Station for Atmospheric Environmental Observation and Research (QOMS) and Waliguan Baseline Observatory (WLG), respectively. Collected samples were analyzed to examine the regional differences in aerosol properties and relate them to potential chemical processes in the TP area. The aerosol mass concentrations inferred from measured chemical components were higher at WLG (11.2 μg m−3) compared to QOMS (6.8 μg m−3). The chemical composition shows higher contribution of organic aerosol at QOMS than that of WLG. The optical properties of water-soluble organic carbon (WSOC) from the QOMS samples show higher light absorption efficient than those collected at WLG. The light absorption of WSOC at QOMS indicates significant pH dependence with enhanced light absorption at higher pH values, while the light absorption of WSOC from WLG samples show very weak pH dependence. The different pH dependence property suggests the different chemical composition between them. The molecular-level chemical composition investigated using high-resolution mass spectrometry (HRMS) assisted with an electrospray ionization (ESI) shows significant differences in WSOC composition representative of two sampling sites. For QOMS samples, CHO and CHON compounds are the major chemical species detected in the negative (−) ESI mode, while CHO and CHOS compounds are the most abundant chemical species detected by the same method in samples collected at WLG. The differences in their molecular composition indicate the different sources and chemical processes in these two regions.
Keywords:

[+]

Aerosols Atmospheric Chemistry
Source:

JGR Atmospheres 125(1): e2019JD031226
DOI:

https://doi.org/10.1029/2019JD031226
Document Type:

Journal Article
Funding:

Grant no. NA16OAR4310101
Place as Subject:

Tibet, Plateau of
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Submitted
Main Document Checksum:

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urn:sha256:cf26627a4874f982fb22b94e5fbf1e8a1553da2a72baf51cebd29f7bf3088c18
Download URL:

https://repository.library.noaa.gov/view/noaa/45518/noaa_45518_DS1.pdf
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