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Climate Sensitivity of Peatland Methane Emissions Mediated by Seasonal Hydrologic Dynamics
Author(s) -
Feng Xue,
Deventer M. Julian,
Lonchar Rachel,
Ng G. H. Crystal,
Sebestyen Stephen D.,
Roman D. Tyler,
Griffis Timothy J.,
Millet Dylan B.,
Kolka Randall K.
Publication year - 2020
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 - 10.1029/2020gl088875
Subject(s) - peat , environmental science , water table , climate change , precipitation , methane , greenhouse gas , atmospheric sciences , hydrology (agriculture) , climatology , groundwater , ecology , oceanography , meteorology , geology , geography , biology , geotechnical engineering
Peatlands are among the largest natural sources of atmospheric methane (CH 4 ) worldwide. Peatland emissions are projected to increase under climate change, as rising temperatures and shifting precipitation accelerate microbial metabolic pathways favorable for CH 4 production. However, how these changing environmental factors will impact peatland emissions over the long term remains unknown. Here, we investigate a novel data set spanning an exceptionally long 11 years to analyze the influence of soil temperature and water table elevation on peatland CH 4 emissions. We show that higher water tables dampen the springtime increases in CH 4 emissions as well as their subsequent decreases during late summer to fall. These results imply that any hydroclimatological changes in northern peatlands that shift seasonal water availability from winter to summer will increase annual CH 4 emissions, even if temperature remains unchanged. Therefore, advancing hydrological understanding in peatland watersheds will be crucial for improving predictions of CH 4 emissions.