Description: Das Projekt "Evasion of mercury from boreal mires" wird vom Umweltbundesamt gefördert und von Universität Basel, Umweltgeowissenschaften durchgeführt. Human activities, such as mining and burning of fossil fuels, have increased the mobilization of mercury (Hg) into the environment and raised the amounts in the atmosphere, soils, fresh waters, and oceans by a factor of three to five. International efforts to alleviate the problem of Hg in the environment are focused on reducing Hg deposition. However, it seems doubtful that these efforts will have a considerable effect, especially in northern countries, since so much Hg has already accumulated in the superficial organic soils of mires. Knowing the land-atmosphere exchange of Hg in mires is crucial to predict how effective efforts to reduce anthropogenic Hg emissions will be in reducing the pool of Hg in these mires and ultimately the loading of the extremely toxic methylmercury (MeHg) from mires to surface waters. We have developed the first long term application of the Relaxed Eddy Accumulation (REA) technique, a micrometeorological method, which has only been used in a few short-term studies on Hg fluxes from contaminated sites up to now. Since our instrument has been tested successfully, we are able to quantify the first seasonal land-atmosphere exchange of gaseous elemental mercury (Hg0) over a boreal mire. The proposed study site Degerö Stormyr is situated close to the host university in Umea, Sweden and provides a very well developed research infrastructure. We hypothesize that emission of Hg0 from the peat surface, especially during snowmelt and summer time, is an important pathway of Hg removal from boreal mires that greatly exceeds export by runoff and leaching. In the frame of my Ph.D. program I want to test this hypothesis using our accurate REA system and determine the most important factors and processes (geochemistry and climate) that promote Hg2+ reduction and subsequent Hg0 evasion. The final goal is to use these results to define whether boreal mires are sinks or sources of mercury and if Hg0 emissions to the atmosphere significantly reduce the large pool of Hg in the superficial peat, now that atmospheric deposition in northern Europe has been reduced by 40 Prozent compared to the early 1990s. The 'Doc.Mobility' fellowship would give me the unique chance to enhance my knowledge in applied micrometeorology and to learn more about the biogeochemistry of Hg in mires in an excellent research environment that is highly regarded internationally in the field of my Ph.D. work.
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Quecksilbergehalt ? Fossiler Brennstoff ? Methylquecksilber ? Meteorologischer Parameter ? Biogeochemie ? Schweden ? Altlast ? Geochemie ? Moor ? Quecksilber ? Schwefel ? Quecksilberemission ? Minamata-Konvention ? Emissionsquelle ? Messprogramm ? Moorboden ? Schadstoffdeposition ? Schadstoffemission ? Schadstoffimmission ? Verbrennung ? Gelöste Stoffe ? Kaltgemäßigte Klimazone ? Quantitative Analyse ? Redoxpotential ? Schwermetallakkumulation ? Stoffbilanz ? Studie ? Vertikalprofil ? Wasserinhaltsstoff ? Wirkungsanalyse ? Deposition ? Langzeituntersuchung ? Meeresgewässer ? Luftschadstoff ? Schadstoffsenke ? Bodenschadstoff ? Forschungsinfrastruktur ? Anwendungstechnik ? Oberflächengewässer ? Atmosphäre ? Klimawandel ? Schadstoffquelle ? Schadstoffverhalten ? Stoffstrom ? Klimawirkung ? Carry-over ? Austauschprozess ? Reduktion [chemisch] ? Schadstoffverbleib ? evasion ? micrometeorology ? mire ? relaxed eddy accumulation (REA) ? Fluss [Bewegung] ?
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2012-04-01 - 2016-05-31
Webseite zum Förderprojekt
https://umweltgeo.unibas.ch/en/research/abgeschlossene-projekte/evasion-of-mercury-from-boreal-mires/#c40330 (Webseite)Accessed 1 times.