Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Pan-Arctic land–atmospheric fluxes of methane and carbon dioxide in response to climate change over the 21st century
Future changes of pan-Arctic land–atmospheric methane (CH _4 ) and carbon dioxide (CO _2 ) depend on how terrestrial ecosystems respond to warming climate. Here, we used a coupled hydrology–biogeochemistry model to make our estimates of these carbon exchanges with two contrasting climate change scenarios (no-policy versus policy) over the 21st century, by considering (1) a detailed water table dynamics and (2) a permafrost-thawing effect. Our simulations indicate that, under present climate conditions, pan-Arctic terrestrial ecosystems act as a net greenhouse gas (GHG) sink of −0.2 Pg CO _2 -eq. yr ^−1 , as a result of a CH _4 source (53 Tg CH _4 yr ^−1 ) and a CO _2 sink (−0.4 Pg C yr ^−1 ). In response to warming climate, both CH _4 emissions and CO _2 uptakes are projected to increase over the century, but the increasing rates largely depend on the climate change scenario. Under the non-policy scenario, the CH _4 source and CO _2 sink are projected to increase by 60% and 75% by 2100, respectively, while the GHG sink does not show a significant trend. Thawing permafrost has a small effect on GHG sink under the policy scenario; however, under the no-policy scenario, about two thirds of the accumulated GHG sink over the 21st century has been offset by the carbon losses as CH _4 and CO _2 from thawing permafrost. Over the century, nearly all CO _2 -induced GHG sink through photosynthesis has been undone by CH _4 -induced GHG source. This study indicates that increasing active layer depth significantly affects soil carbon decomposition in response to future climate change. The methane emissions considering more detailed water table dynamics continuously play an important role in affecting regional radiative forcing in the pan-Arctic.
Pan-Arctic land–atmospheric fluxes of methane and carbon dioxide in response to climate change over the 21st century
Future changes of pan-Arctic land–atmospheric methane (CH _4 ) and carbon dioxide (CO _2 ) depend on how terrestrial ecosystems respond to warming climate. Here, we used a coupled hydrology–biogeochemistry model to make our estimates of these carbon exchanges with two contrasting climate change scenarios (no-policy versus policy) over the 21st century, by considering (1) a detailed water table dynamics and (2) a permafrost-thawing effect. Our simulations indicate that, under present climate conditions, pan-Arctic terrestrial ecosystems act as a net greenhouse gas (GHG) sink of −0.2 Pg CO _2 -eq. yr ^−1 , as a result of a CH _4 source (53 Tg CH _4 yr ^−1 ) and a CO _2 sink (−0.4 Pg C yr ^−1 ). In response to warming climate, both CH _4 emissions and CO _2 uptakes are projected to increase over the century, but the increasing rates largely depend on the climate change scenario. Under the non-policy scenario, the CH _4 source and CO _2 sink are projected to increase by 60% and 75% by 2100, respectively, while the GHG sink does not show a significant trend. Thawing permafrost has a small effect on GHG sink under the policy scenario; however, under the no-policy scenario, about two thirds of the accumulated GHG sink over the 21st century has been offset by the carbon losses as CH _4 and CO _2 from thawing permafrost. Over the century, nearly all CO _2 -induced GHG sink through photosynthesis has been undone by CH _4 -induced GHG source. This study indicates that increasing active layer depth significantly affects soil carbon decomposition in response to future climate change. The methane emissions considering more detailed water table dynamics continuously play an important role in affecting regional radiative forcing in the pan-Arctic.
Pan-Arctic land–atmospheric fluxes of methane and carbon dioxide in response to climate change over the 21st century
Xudong Zhu (Autor:in) / Qianlai Zhuang (Autor:in) / Xiang Gao (Autor:in) / Andrei Sokolov (Autor:in) / C Adam Schlosser (Autor:in)
2013
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Metadata by DOAJ is licensed under CC BY-SA 1.0
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