Temporal trend studies of the atmospheric Hg deposition with ice-core/snow in Canadian High Arctic and Greenland

Multiple glacier sites in the High Arctic (Canadian Ice caps and North Greenland) were sampled for studies of total mercury (THg) and/or monomethyl mercury (MeHg), including an 80-meter, over 200-yr long firn core from northeast Greenland (NEEM site). Results from cores drilled from Mt. Oxford icefield and Agassiz ice cap (Ellesmere Island) reveal a period of enhanced atmospheric THg deposition from the mid 1990s up until ~2005. Data from a core obtained on southern Baffin Island (Penny ice cap) suggest that this interval of enhanced THg deposition was felt all over the Canadian Arctic. Ongoing analyses from the NEEM core should soon help to determine if this is a local pattern or broader, regional phenomenon. Net deposition rates of THg calculated from ice cores suggest that mercury fluxed on Canadian High Arctic ice caps are at levels in the order of 0.1 µg m-2 yr-1 or less, which is much lower than THg accumulation rates inferred from lake sediments, peat bogs and alpine (mid-latitude) ice cores.

Identifier
Source https://www.polardata.ca/pdcsearch/PDCSearchDOI.jsp?doi_id=11050
Metadata Access http://www.polardata.ca/oai/provider?verb=GetRecord&metadataPrefix=fgdc&identifier=11050_fgdc
Provenance
Creator jiancheng zheng
Publisher Canadian Cryospheric Information Network
Contributor GSC North Canada
Publication Year 2014
Rights Public
Contact jzheng@nrcan.gc.ca
Representation
Language English
Coverage
Discipline Environmental Research
Spatial Coverage (75N-82N,100W-50W)
Temporal Coverage Begin 2008-01-01T11:59:59Z
Temporal Coverage End 2010-12-31T11:59:59Z