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231224s2017 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.13520
|2 doi
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|a pubmed24n0882.xml
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|a (DE-627)NLM264877233
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|a (NLM)27689625
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Helbig, Manuel
|e verfasserin
|4 aut
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| 245 |
1 |
4 |
|a The positive net radiative greenhouse gas forcing of increasing methane emissions from a thawing boreal forest-wetland landscape
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|c 2017
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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| 500 |
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|a Date Completed 23.10.2017
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|a Date Revised 02.12.2018
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2016 John Wiley & Sons Ltd.
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|a At the southern margin of permafrost in North America, climate change causes widespread permafrost thaw. In boreal lowlands, thawing forested permafrost peat plateaus ('forest') lead to expansion of permafrost-free wetlands ('wetland'). Expanding wetland area with saturated and warmer organic soils is expected to increase landscape methane (CH4 ) emissions. Here, we quantify the thaw-induced increase in CH4 emissions for a boreal forest-wetland landscape in the southern Taiga Plains, Canada, and evaluate its impact on net radiative forcing relative to potential long-term net carbon dioxide (CO2 ) exchange. Using nested wetland and landscape eddy covariance net CH4 flux measurements in combination with flux footprint modeling, we find that landscape CH4 emissions increase with increasing wetland-to-forest ratio. Landscape CH4 emissions are most sensitive to this ratio during peak emission periods, when wetland soils are up to 10 °C warmer than forest soils. The cumulative growing season (May-October) wetland CH4 emission of ~13 g CH4 m-2 is the dominating contribution to the landscape CH4 emission of ~7 g CH4 m-2 . In contrast, forest contributions to landscape CH4 emissions appear to be negligible. The rapid wetland expansion of 0.26 ± 0.05% yr-1 in this region causes an estimated growing season increase of 0.034 ± 0.007 g CH4 m-2 yr-1 in landscape CH4 emissions. A long-term net CO2 uptake of >200 g CO2 m-2 yr-1 is required to offset the positive radiative forcing of increasing CH4 emissions until the end of the 21st century as indicated by an atmospheric CH4 and CO2 concentration model. However, long-term apparent carbon accumulation rates in similar boreal forest-wetland landscapes and eddy covariance landscape net CO2 flux measurements suggest a long-term net CO2 uptake between 49 and 157 g CO2 m-2 yr-1 . Thus, thaw-induced CH4 emission increases likely exert a positive net radiative greenhouse gas forcing through the 21st century
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4 |
|a Journal Article
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| 650 |
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|a boreal forest
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| 650 |
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4 |
|a carbon dioxide
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| 650 |
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4 |
|a climate change
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| 650 |
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4 |
|a eddy covariance
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| 650 |
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4 |
|a methane
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| 650 |
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4 |
|a radiative forcing
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| 650 |
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4 |
|a wetland
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| 650 |
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7 |
|a Soil
|2 NLM
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| 650 |
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7 |
|a Carbon Dioxide
|2 NLM
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| 650 |
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7 |
|a 142M471B3J
|2 NLM
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| 650 |
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7 |
|a Methane
|2 NLM
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| 650 |
|
7 |
|a OP0UW79H66
|2 NLM
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| 700 |
1 |
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|a Chasmer, Laura E
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kljun, NatasCha
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Quinton, William L
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Treat, Claire C
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Sonnentag, Oliver
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Global change biology
|d 1999
|g 23(2017), 6 vom: 26. Juni, Seite 2413-2427
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
1 |
8 |
|g volume:23
|g year:2017
|g number:6
|g day:26
|g month:06
|g pages:2413-2427
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| 856 |
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0 |
|u http://dx.doi.org/10.1111/gcb.13520
|3 Volltext
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|d 23
|j 2017
|e 6
|b 26
|c 06
|h 2413-2427
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