 |
| Titel |
Distribution and air-sea exchange of mercury (Hg) in the Yellow Sea |
| VerfasserIn |
Z. J. Ci, X. S. Zhang, Z. W. Wang, Z. C. Niu, X. Y. Diao, S. W. Wang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 6 ; Nr. 11, no. 6 (2011-03-28), S.2881-2892 |
| Datensatznummer |
250009527
|
| Publikation (Nr.) |
 copernicus.org/acp-11-2881-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Yellow Sea, surrounded by East China and the Korea Peninsula, is a
potentially important receptor for anthropogenic mercury (Hg) emissions from
East Asia. However, there is little documentation about the distribution and
cycle of Hg in this marine system. During the cruise covering the Yellow Sea
in July 2010, gaseous elemental mercury (GEM or Hg(0)) in the atmosphere,
total Hg (THg), reactive Hg (RHg) and dissolved gaseous mercury (DGM,
largely Hg(0)) in the waters were measured aboard the R/V Kexue III. The mean (±SD)
concentration of GEM over the entire cruise was 2.61 ± 0.50 ng m−3
(range: 1.68 to 4.34 ng m−3), which were generally higher than other
open oceans. The spatial distribution of GEM generally reflected a clear
gradient with high levels near the coast of East China and low levels in
open waters, suggesting the significant atmospheric Hg outflow from East
China. The mean concentration of THg in the surface waters was 1.69 ± 0.35 ng l−1 and the RHg accounted for a considerable fraction of THg
(RHg: 1.08 ± 0.28 ng l−1, %RHg/THg = 63.9%). The mean
concentration of DGM in the surface waters was 63.9 ± 13.7 pg l−1
and always suggested the supersaturation of Hg(0) in the surface waters with
respect to Hg(0) in the atmosphere (the degree of saturation: 7.8 ± 2.3
with a range of 3.6–14.0). The mean Hg(0) flux at the air-sea interface
was estimated to be 18.3 ± 11.8 ng m−2 h−1 based on a
two-layer exchange model. The high wind speed and DGM levels induced the
extremely high Hg(0) emission rates. Measurements at three stations showed
no clear vertical patterns of DGM, RHg and THg in the water column. Overall,
the elevated Hg levels in the Yellow Sea compared with other open oceans
suggested that the human activity has influenced the oceanic Hg cycle
downwind of East Asia. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|