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Growing season methyl bromide and methyl chloride fluxes at a sub‐arctic wetland in Sweden
Author(s) -
Hardacre C. J.,
Blei E.,
Heal M. R.
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2009gl038277
Subject(s) - tundra , arctic , environmental science , sink (geography) , flux (metallurgy) , bromide , atmospheric sciences , chloride , wetland , growing season , the arctic , environmental chemistry , hydrology (agriculture) , climatology , chemistry , geography , oceanography , ecology , geology , cartography , organic chemistry , biology , geotechnical engineering
Methyl bromide and methyl chloride fluxes were measured at several sites in a sub‐arctic wetland near Abisko, Sweden (68°28′N 18°49′E) throughout the 2008 growing season. Averaged over 92 flux measurements the sub‐arctic wetland was found to be a small net sink for CH 3 Br, with mean (±1 sd) uptake of −25 (±20) ng m −2 h −1 , but a small net source of CH 3 Cl with mean emissions of 400 (±1600) ng m −2 h −1 . Seasonal trends were observed in both CH 3 Br and CH 3 Cl net fluxes, but diurnal trends for CH 3 Cl only, with peak emissions observed during the afternoon. CH 3 Cl fluxes differed significantly with hydrological status of measurement locations; however, no other substantial correlations were observed between fluxes and external parameters (air and soil temperature and PAR). This study shows that the single previous estimated sink flux for CH 3 Cl in tundra globally (derived from measurements in Alaska) requires revision, although not that for CH 3 Br.