uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
A dual-inlet, single detector relaxed eddy accumulation system for long-term measurement of mercury flux
Univ Basel, Dept Environm Sci, Basel, Switzerland..
Univ Basel, Dept Environm Sci, Basel, Switzerland..
Univ Basel, Dept Environm Sci, Basel, Switzerland..
Univ Basel, Dept Environm Sci, Basel, Switzerland..
Show others and affiliations
2016 (English)In: Atmospheric Measurement Techniques, ISSN 1867-1381, E-ISSN 1867-8548, Vol. 9, no 2, 509-524 p.Article in journal (Refereed) PublishedText
Abstract [en]

The fate of anthropogenic emissions of mercury (Hg) to the atmosphere is influenced by the exchange of elemental Hg with the earth surface. This exchange holds the key to a better understanding of Hg cycling from local to global scales, which has been difficult to quantify. To advance research about land-atmosphere Hg interactions, we developed a dual-inlet, single detector relaxed eddy accumulation (REA) system. REA is an established technique for measuring turbulent fluxes of trace gases and aerosol particles in the atmospheric surface layer. Accurate determination of gaseous elemental mercury (GEM) fluxes has proven difficult due to technical challenges presented by extremely small concentration differences (typically < 0.5 ngm(-3)) between updrafts and downdrafts. We present an advanced REA design that uses two inlets and two pairs of gold cartridges for continuous monitoring of GEM fluxes. This setup reduces the major uncertainty created by the sequential sampling in many previous designs. Additionally, the instrument is equipped with a GEM reference gas generator that monitors drift and recovery rates. These innovations facilitate continuous, autonomous measurement of GEM flux. To demonstrate the system performance, we present results from field campaigns in two contrasting environments: an urban setting with a heterogeneous fetch and a boreal peatland during snowmelt. The observed average emission rates were 15 and 3 n gm(-2) h(-1), respectively. We believe that this dual-inlet, single detector approach is a significant improvement of the REA system for ultra-trace gases and can help to advance our understanding of long-term land-atmosphere GEM exchange.

Place, publisher, year, edition, pages
2016. Vol. 9, no 2, 509-524 p.
National Category
Meteorology and Atmospheric Sciences
URN: urn:nbn:se:uu:diva-297556DOI: 10.5194/amt-9-509-2016ISI: 000375612000012OAI: oai:DiVA.org:uu-297556DiVA: diva2:942801
Swedish Research Council, 2009-15586-68819-37
Available from: 2016-06-27 Created: 2016-06-23 Last updated: 2016-06-27Bibliographically approved

Open Access in DiVA

fulltext(4085 kB)34 downloads
File information
File name FULLTEXT01.pdfFile size 4085 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Bishop, Kevin
By organisation
LUVALUppsala Centre for Sustainable Development, CSD Uppsala
In the same journal
Atmospheric Measurement Techniques
Meteorology and Atmospheric Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 34 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 88 hits
ReferencesLink to record
Permanent link

Direct link