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| Titel |
Observation and analysis of speciated atmospheric mercury in Shangri-La, Tibetan Plateau, China |
| VerfasserIn |
H. Zhang, X. W. Fu, C.-J. Lin, X. Wang, X. B. Feng |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 2 ; Nr. 15, no. 2 (2015-01-19), S.653-665 |
| Datensatznummer |
250119331
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| Publikation (Nr.) |
 copernicus.org/acp-15-653-2015.pdf |
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| Zusammenfassung |
| This study reports the concentrations and potential sources of speciated
atmospheric mercury at the Shangri-La Atmosphere Watch Regional Station
(SAWRS), a pristine high-altitude site (3580 m a.s.l.) in Tibetan
Plateau, China. Total gaseous mercury (TGM, defined as the sum of gaseous
elemental mercury, GEM, and gaseous oxidized mercury, GOM), GOM and
particulate-bound mercury (PBM) were monitored from November 2009 to
November 2010 to investigate the characteristics and potential influence of
the Indian summer monsoon (ISM) and the Westerlies on atmospheric
transport of mercury. The mean concentrations (± standard deviation)
of TGM, PBM and GOM were 2.55 ± 0.73 ng m−3, 38.82 ± 31.26 pg m−3
and 8.22 ± 7.90 pg m−3, respectively. A notable seasonal
pattern of TGM concentrations was observed with higher concentrations at the
beginning and the end of the ISM season. High TGM concentrations
(> 2.5 ng m−3) were associated with the transport of dry air
that carried regional anthropogenic emissions from both Chinese domestic and
foreign (e.g., Myanmar, Bay of Bengal, and northern India) sources based on analysis
of HYSPLIT4 back trajectories. Somewhat lower PBM and GOM levels during
the ISM period were attributed to the enhanced wet
scavenging. The high GOM and PBM were likely caused by local
photo-chemical transformation under low RH and the domestic biofuel burning
in cold seasons. |
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