 |
| Titel |
Mixing of Asian mineral dust with anthropogenic pollutants over East Asia: a model case study of a super-duststorm in March 2010 |
| VerfasserIn |
J. Li, Z. Wang, G. Zhuang, G. Luo, Y. Sun, Q. Wang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 16 ; Nr. 12, no. 16 (2012-08-21), S.7591-7607 |
| Datensatznummer |
250011405
|
| Publikation (Nr.) |
 copernicus.org/acp-12-7591-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Mixing of Asian mineral dust with anthropogenic pollutants allows pollutants
(e.g. sulfate and nitrate) to be transported over longer distances (e.g. to
the northern Pacific, even to North America) along with dust particles. This
mixing therefore affects the atmospheric and oceanic environment at local,
regional and even continental scales. In this study, we used a
three-dimensional regional chemical transport model (Nested Air Quality
Predicting Modeling System, NAQPMS) to examine the degree of mixing between
Asian mineral dust and anthropogenic pollutants in a super-duststorm event
during 19–22 March 2010. Influences of the mixing processes on regional
atmospheric environmental and oceanic biogeochemical cycles were also
investigated. A comparison with measurements showed that the model
reproduced well the trajectory of long-range dust transport, the vertical
dust profile, and the chemical evolution of dust particles. We found that
along-path mixing processes during the long-range transport of Asian dust
led to increasingly polluted particles. As a result, ~60%
of the sulfate and 70–95% of the nitrate in the downwind regions was
derived from active mixing processes of minerals with pollutants sourced
from the North China Plain and enhanced by transport over South China. This
mixing had a significant impact on the regional-scale atmospheric
composition and oceanic biogeochemical cycle. Surface HNO3, SO2
and O3 were decreased by up to 90%, 40% and 30%, respectively,
due to the heterogeneous reactions on dust particles. Fe solubility rose
from ~0.5% in the Gobi region to ~3–5%
in the northwestern Pacific, resulting from oxidization of SO2 on dust
particles. Total Fe(II) deposition in the ocean region of East Asia reached
327 tons during the 4-day dust event, and created a calculated primary
productivity of ~520 mgC m−2 d−1 in the Kuril Islands, which can support almost 100% of the observed
mean marine primary productivity in spring in this region (526 mgC m−2 d−1). |
| |
|
| Teil von |
|
|
|
|
|
|
|
|