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Methylmercury (MeHg), commonly produced in peatlands, affects downstream waters; therefore, it is important to understand how temperature transitions affect mercury (Hg) dynamics. We investigated how the freeze\u2013thaw cycle influences belowground peat pore water total Hg (THg), MeHg, and dissolved organic carbon (DOC). Four large, intact peat columns were removed from an ombrotrophic peat bog and experimentally frozen and thawed. Pore water was sampled across seven depths in the peat columns during the freeze\u2013thaw cycle and analyzed for THg, MeHg, and DOC concentrations. Freezing results showed increased concentrations of THg below the ice layers and limited change in MeHg concentrations. During thawing, THg concentrations significantly increased, whereas MeHg concentrations decreased. Limited bromide movement and depth decreases in THg and DOC concentrations were associated with increased bulk density and degree of humification in the peat. The experiment demonstrates the effects of the freeze\u2013thaw cycle on Hg concentrations in northern peatlands. Changes to freeze\u2013thaw cycles with climate change may exacerbate Hg cycling and transport processes in peatland environments.<\/jats:p>","DOI":"10.1002\/jeq2.20046","type":"journal-article","created":{"date-parts":[[2020,3,6]],"date-time":"2020-03-06T05:01:50Z","timestamp":1583470910000},"page":"404-416","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Mercury dynamics in the pore water of peat columns during experimental freezing and thawing"],"prefix":"10.1002","volume":"49","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1287-638X","authenticated-orcid":false,"given":"Jennie I.","family":"Sirota","sequence":"first","affiliation":[{"name":"Dep. of Forest Resources Univ. of Minnesota  1530 Cleveland Ave. N St. Paul MN 55108"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6419-8218","authenticated-orcid":false,"given":"Randall K.","family":"Kolka","sequence":"additional","affiliation":[{"name":"Northern Research Station USDA Forest Service  1831 Hwy 169 East Grand Rapids MN 55744"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6315-0108","authenticated-orcid":false,"given":"Stephen D.","family":"Sebestyen","sequence":"additional","affiliation":[{"name":"Northern Research Station USDA Forest Service  1831 Hwy 169 East Grand Rapids MN 55744"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Edward A.","family":"Nater","sequence":"additional","affiliation":[{"name":"Dep. of Soil, Water, and Climate Univ. of Minnesota  1991 Upper Buford Circle St. Paul MN 55108"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2020,3,6]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/1099-1085(20001015)14:14<2489::AID-HYP110>3.0.CO;2-Q"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1029\/1999GB900033"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2005.09.043"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1098\/rstb.1984.0002"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.atmosenv.2012.09.047"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1029\/JZ067i003p01085"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF01189700"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1021\/es305071v"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/0269-7491(91)90031-Q"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1039\/c2em30267e"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1314641111"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41396-019-0376-1"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-8137.1966.tb06356.x"},{"issue":"4","key":"e_1_2_9_15_1","first-page":"248","article-title":"Freezing\u2010induced vertical solute movement in peat","volume":"7","author":"Kadlec R. 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