Latnjajaure fältstation - ITEX CH4 data och miljödata för åren 2017-2018
Citation and access
Citation and access
Data access level:
Creator/Principal investigator(s):
- Mario Rudner - University of Gothenburg - Department of Earth Sciences
- Argus Pesqueda - Universitat Autònoma de Barcelona - Center for Ecological Research and Forestry Applications
Research principal:
Data contains personal data:
No
Citation:
License:
Language:
Method and outcome
Method and outcome
Time period(s) investigated:
Variables:
7
Data format/data structure:
Data collection - Observation
Data collection - Observation
Mode of collection:
Observation
Description of the mode of collection:
Fluxes of methane were measured on a bi-weekly basis during the growing season of 2017 and 2018 (June – August). A transparent chamber (Ø = 20 cm, h = 20 cm) equipped with a pressure vent was fitted to pre-installed soil collars (inserted 5-10 cm into the soil) and an airtight seal was obtained by folding down a rubber tape from the chamber over the collar. The corresponding change in methane concentration in the chamber was measured using an Ultraportable Greenhouse Gas Analyzer (operating at 1 Hz, UGGA, Los Gatos Research, San Jose, U.S.). In connection to all flux measurements, soil temperatures at - 5 cm (Tsoil) and soil water content at 0 – 6 cm (SWC) were recorded at four locations around the chamber (using a hand-held thermometer and an ML3 ThetaProbe, Delta-T Devices, Cambridge, U.K., respectively), Additional soil data were also collected, including pH and soil organic matter (SOM), from 5 cm deep soil cores (Ø = 2.5 cm) collected in July 2019. General canopy heights were investigated in 2020 by laying out two lines, from corner to corner in plots, forming a cross with nine marked investigation points where height from ground to the top of the canopy was recorded.
Time period(s) for data collection:
2017-06-01 - 2020-09-01
Data collector:
- University of Gothenburg
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Source of the data:
- Research data
Temporal resolution:
0.5 month
Geographic coverage
Geographic coverage
Geographic location:
Geographic description:
Latnjajaure Field Station, 15km west of Abisko, Sweden
Administrative information
Administrative information
Responsible department/unit:
Department of Biology and Environmental Sciences
Funding
Funding
Funding agency:
Award number:
2016-01187_Formas
Award title:
Thawing permafrost soils – long-term impacts on ecosystems carbon and nitrogen dynamics
Funding information:
Permafrost soils contain approximately 1700 Petagram carbon (C), twice the amount of the current atmosphere, and constitute 50% of the world’s belowground C pool. Along with the current change in climate these high latitudinal soils experience increased temperatures, with permafrost degradation as a result. This thaw releases organic matter and where the following microbial degradation will release the ancient C and nitrogen (N) to the atmosphere as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), further influencing the climate systems. Thus, a changed climate leads to sever alterations of the C and N balance in Arctic and high altitude ecosystems.The proposed project aims for understanding the future that lies ahead, following thaw and the establishment of new non-permafrost ecosystems, and how the predicted climate variability will influence these soils on a long-term timescale. By using a natural occurring permafrost degradation gradient, the project investigates: the change in C and N dynamics following thaw, the decomposability of ancient carbon, and the microbial response following degradation and during the transit to new ecosystem types. Furthermore, by using laboratory incubation of soils from the gradient, the project provides insights in how the C and N cycles (at the different stages of permafrost degradation) will respond to the changing climate, giving a decadal perspective on permafrost thaw.
Funding agency:
- Swedish Research Council
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Award number:
2021-04011_VR
Award title:
Disentangling the hidden methane consumption in a warmer Arctic
Funding information:
The Arctic terrestrial methane debate is strongly biased by results from carbon-rich wetlands, which are methane-emission hotspots. Less attention has been given to the carbon-poor mineral soils, cover almost 87% of the Arctic. The terrestrial methane budget is determined by two contrasting processes, production and consumption, both occurring within the soil. In previous work we have shown a consistent increase (23-27%) in methane consumption when ecosystems have adapted to a future climate (year 2050-2080). In this proposal, we will challenge the emissions-dominated view of the Arctic, and test if our results can be generalized to a circumpolar context.With global warming, Arctic plant communities respond rapidly, leading to taller plants, increased biomass, and changed composition. These changes will lead to increased oxygen availability in surface soils (e.g. increased evapotranspiration), a process critical for the methane budget. Methane is produced during anoxic conditions in water-saturated soils, while the aerated surface soil is occupied by methane-consuming bacteria, strongly reducing emissions or even absorbing atmospheric methane, processes often hidden in measurements.We hypothesize that changes in plant communities and climate conditions will significantly increase the methane consumption rates, increasing the Arctic sink strength. This represents an important negative climate feedback, potentially giving us the time needed to reach a climate neutral lifestyle.
Funding agency:
Award number:
2022-00786_Formas
Award title:
Will increased precipitation reduce methane consumption in a future Arctic?
Funding information:
Our knowledge of the Arctic methane (CH4) budget is strongly influenced by measurements from carbon-rich wetlands, which emit large amounts of CH4. Less attention has been paid to the significant and strongly regulating CH4 consumption. The flow of CH4 to and from the soil depends on two processes: uptake (drier soils, good oxygen supply) and production (water-saturated, anoxic environments). In previous projects, we have shown increased CH4 uptake in plant communities adapted to a warmer climate. So far, there is very little knowledge about how the increased precipitation will influence this.With a changing climate, the Arctic plant communities react quickly, increasing height and biomass. This increases evapotranspiration, resulting in drier soil and increased oxygen availability. In addition, the plant communities change, leading to increased drainage and drier surface layers. However, with rising temperatures, precipitation also increases. We are now heading towards a rain over snow dominance, which potentially leads to wetter soils, reduced oxygen availability and reduced CH4 consumption.We hypothesize that increased precipitation will counteract the positive temperature response seen in Arctic CH4 consumption. The response will look different in wetlands, where increased precipitation favours CH4 emissions, as compared to drier environments, where increased precipitation may benefit CH4 consumption. This balance is the key to understand climate feedback from the Arctic.
Funding agency:
- the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie
Award number:
657627
Award title:
Permafrost thaw – decadal responses to climate change
