【摘 要】
：
Mass concentration,13C PDB (13δC) of water-insoluble and refractory carbon (WIRC) as the proxy for black carbon (BC) chemically extracted from total suspended particles (TSP) samples collected from De
【机 构】
：
Chinese Academy of Meteorological Sciences,Beijing,100081,P.R.China
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Mass concentration,13C PDB (13δC) of water-insoluble and refractory carbon (WIRC) as the proxy for black carbon (BC) chemically extracted from total suspended particles (TSP) samples collected from December 2002 to January 2004 (50 samples) and from October 2005 to May 2006 (29 samples) at Waliguan (36.287oN 100.898oE,3810 m) are presented.The concentration of WIRC was 1183 ± 120 ng/m3,with the highest values in spring-winter,and its variation was in agreement with the optical BC concentration measured by aethalometer- but WIRC have higher values,especially in winter-spring with factor of 1~2.The seasonal mass concentration difference between WIRC and optical BC perhaps indicates that water soluble / insoluble carbon aerosols dominate the fraction of summer-autumn/winter-spring carbonaceous aerosols at the site.Mean 13δC of -25.3 ± 0.8‰ revealed that C3 plant burning was the major source of the WIRC.14C PMC for the later 29 samples revealed that the overall mean fraction of contemporary-derived carbon (fC) of BC was 67.2 ± 7.7% (n = 29).The fC and BC concentration was strongly associated with air parcel transports.Lower fC accompanying moist air-parcels were transported from eastern Waliguan in autumn and early winter,but the continuous fossil combustion heating in the region decreased fC in late winter and spring.Dust-storm transport through the remote areas of western may have caused high fC even though mass concentrations of TSP and BC were abnormally high.Week-to-week variations of 210Pb activity concentration in TSP and percentage of fossil–derived carbon (ff ) were in agreement,providing some evidence that coal combustion was the dominant fossil source of BC at Waliguan.
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