Permafrost Stores a Globally Significant Amount of Mercury

Schuster, Paul F.; Schaefer, Kevin M.; Aiken, George R.; Antweiler, Ronald C.; Dewild, John F.; Gryziec, Joshua D.; Gusmeroli, Alessio; Hugelius, Gustaf; Jafarov, Elchin; Krabbenhoft, David P.; Liu, Lin; Herman‐Mercer, Nicole; Mu, Cuicui; Roth, David A.; Schaefer, Tim; Striegl, Robert G.; Wickland, Kimberly P.; Zhang, Tingjun

doi:10.1002/2017GL075571

Permafrost Stores a Globally Significant Amount of Mercury

Journal Article · Mon Feb 05 00:00:00 EST 2018 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2017GL075571· OSTI ID:1512739

^[1]; ^[2]; ^[1]; ^[1]; ^[3]; Gryziec, Joshua D. ^[4]; ^[5]; ^[6]; ^[7]; ^[3]; ^[8]; ^[1]; ^[9]; ^[1]; Schaefer, Tim ^[10]; ^[1]; ^[1]; ^[9]

U.S. Geological Survey, Boulder, CO (United States)
Univ. of Colorado, Boulder, CO (United States)
Mercury Research Lab., Middleton, WI (United States)
Environmental Service Lab., Broomfield, CO (United States)
Univ. of Alaska, Fairbanks, AK (United States)
Stockholm Univ. (Sweden)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Chinese Univ. of Hong Kong (CUHK), Shatin (Hong Kong)
Lanzhou Univ. (China)
Galmont Consulting, Chicago, IL (United States)

Changing climate in northern regions is causing permafrost to thaw with major implications for the global mercury (Hg) cycle. We estimated Hg in permafrost regions based on in situ measurements of sediment total mercury (STHg), soil organic carbon (SOC), and the Hg to carbon ratio (R_HgC) combined with maps of soil carbon. We measured a median STHg of 43 ± 30 ng Hg g soil^-1 and a median R_HgC of 1.6 ± 0.9 μg Hg g C^-1, consistent with published results of STHg for tundra soils and 11,000 measurements from 4,926 temperate, nonpermafrost sites in North America and Eurasia. We estimate that the Northern Hemisphere permafrost regions contain 1,656 ± 962 Gg Hg, of which 793 ± 461 Gg Hg is frozen in permafrost. Permafrost soils store nearly twice as much Hg as all other soils, the ocean, and the atmosphere combined, and this Hg is vulnerable to release as permafrost thaws over the next century. Existing estimates greatly underestimate Hg in permafrost soils, indicating a need to reevaluate the role of the Arctic regions in the global Hg cycle.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Science Foundation; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1512739

Report Number(s):: LA-UR--17-23053

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 3 Vol. 45; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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