 |
| Titel |
Temporal variations of black carbon in Guangzhou, China, in summer 2006 |
| VerfasserIn |
R. L. Verma, L. K. Sahu, Y. Kondo, N. Takegawa, S. Han, J. S. Jung, Y. J. Kim, S. Fan, N. Sugimoto, M. H. Shammaa, Y. H. Zhang, Y. Zhao |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 14 ; Nr. 10, no. 14 (2010-07-16), S.6471-6485 |
| Datensatznummer |
250008629
|
| Publikation (Nr.) |
 copernicus.org/acp-10-6471-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| In situ measurements of the mass concentration of black carbon (BC) and
mixing ratios of carbon monoxide (CO) and carbon dioxide (CO2) were
made at Guangzhou, an urban measurement site in the Pearl River Delta (PRD),
China, in July 2006. The average ± standard deviation (SD)
concentrations of BC, CO, and CO2 were 4.7± 2.3 μgC m−3,
798± 459 ppbv, and 400± 13 ppmv, respectively. The trends of these
species were mainly controlled by synoptic-scale changes in meteorology
during the campaign. Based on back trajectories, data are analyzed
separately for two different air mass types representing northerly and
southerly flows. The northerly air masses, which constituted ~25%
of the campaign, originated mostly in the PRD and hence represent
observations on regional scales. On the other hand, during southerly flow
(~75%), the measurements were influenced by dilution due to cleaner
marine air. The diurnal patterns of BC, CO, and CO2 exhibited peak
concentrations during the morning and evening hours coinciding with
rush-hour traffic. The ratios of OC/BC were lower during the morning hour
peaks in the concentrations of primary pollutants due to their fresh
emissions mainly from vehicular traffic in Guangzhou. The diurnal variations
of BC observed in southerly air masses tended to follow the traffic patterns
of heavy-duty vehicles (HDV) in Guangzhou, while the roles of other sources
need to be investigated. The slopes of ΔBC/ΔCO, ΔBC/ΔCO2,
and ΔCO/ΔCO2 observed during
northerly flows were 0.0045 μgC m−3/ppbv, 0.13 μgC m−3/ppmv, and 49.4 ppbv/ppmv, respectively, agreeing reasonably with
their respective emission ratios derived from regional emission inventories. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|