| Title | A decline in Arctic Ocean mercury suggested by differences in decadal trends of atmospheric mercury between the Arctic and northern midlatitudes |
| Authors | Chen, Long Zhang, Yanxu Jacob, Daniel J. Soerensen, Anne L. Fisher, Jenny A. Horowitz, Hannah M. Corbitt, Elizabeth S. Wang, Xuejun |
| Affiliation | Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA. Peking Univ, Coll Urban & Environm Sci, Minist Educ, Lab Earth Surface Proc, Beijing 100871, Peoples R China. Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA. Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden. Harvard Univ, TH Chan Sch Publ Hlth, Dept Environm Hlth, Boston, MA USA. Univ Wollongong, Sch Chem, Wollongong, NSW, Australia. |
| Keywords | mercury Arctic trend climatological variables AIR-SEA EXCHANGE METHYLATED MERCURY GASEOUS MERCURY SURFACE WATERS 10-YEAR TRENDS TEMPERATURE DEPOSITION ATLANTIC MODEL ICE |
| Issue Date | 2015 |
| Publisher | GEOPHYSICAL RESEARCH LETTERS |
| Citation | GEOPHYSICAL RESEARCH LETTERS.2015,42,(14),6076-6083. |
| Abstract | Atmospheric mercury (Hg) in the Arctic shows much weaker or insignificant annual declines relative to northern midlatitudes over the past decade (2000-2009) but with strong seasonality in trends. We use a global ocean-atmosphere model of Hg (GEOS-Chem) to simulate these observed trends and determine the driving environmental variables. The atmospheric decline at northern midlatitudes can largely be explained by decreasing North Atlantic oceanic evasion. The midlatitude atmospheric signal propagates to the Arctic but is countered by rapid Arctic warming and declining sea ice, which suppresses deposition and promotes oceanic evasion over the Arctic Ocean. The resulting simulation implies a decline of Hg in the Arctic surface ocean that we estimate to be -0.67%yr(-1) over the study period. Rapid Arctic warming and declining sea ice are projected for future decades and would drive a sustained decline in Arctic Ocean Hg, potentially alleviating the methylmercury exposure risk for northern populations. |
| URI | http://hdl.handle.net/20.500.11897/418071 |
| ISSN | 0094-8276 |
| DOI | 10.1002/2015GL064051 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 城市与环境学院 地表过程分析与模拟教育部重点实验室 |
