Sentences with phrase «firn during recent decades»
We can not eliminate the possibility that slow evolution of environmental conditions (e.g., surface temperature and irradiation) and snow composition (e.g., sea salts levels) induced slight evolution in chemical processes involving GEM in the shallow firn during recent decades.
http://www.pnas.org/ Not exact matches
Hence, atmospheric GEM concentrations inferred from Greenland firn air and global anthropogenic Hg emissions have exhibited consistently similar trends during the most recent decades (Fig. 2), suggesting that the atmospheric reservoir of mercury at mid - and high - northern latitudes has been driven mainly by anthropogenic emissions during the last decades.
Thus, firn air collected at Summit becomes a powerful archive to infer the impact of human emissions on the atmospheric reservoir during recent decades.