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Interactions between climate change and the Cryosphere: Research article 11 Dec yogos Climate of the Past. Geoscientific Instrumentation, Methods and Data Systems.
Hydrology and Earth System Sciences. Natural Hazards and Earth System Sciences. Nonlinear Processes in Geophysics. Author Title Abstract Full text. Journal metrics Journal metrics IF 3. Volume 10, issue Article Peer review Metrics Related articles. Volume 10, issue 12 Biogeosciences, 10,https: This work is distributed under the Creative Commons Attribution 3.
Biogeosciences, 10,https: Show only first author papers Show all papers. yunnar
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Biogeosciences, 12,https: Short summary We tested the hypothesis that diffuse radiation from cloudy and overcast skies penetrates the canopy more effectively than direct radiation from clear skies. We compared the flux density and spectral properties of direct and diffuse radiation above, within and below a forest stand under sunny, cloudy and overcast conditions in a thinned Sitka spruce forest.
We recorded vertical 1m resolution and horizontal 2. Kerby, and Isla H. Short summary Using drones, satellite images and historic photos we surveyed a permafrost coastline on Qikiqtaruk—Herschel Island.
We aimed to assess coastal change over small timesteps, relate short-term changes to longer-term changes, and assess drones as tools for surveying Arctic coastlines. Inwe observed coastal retreat of Episodic changes are poorly understood in permafrost coastlines. Bodelier, and Susanne Liebner.
Biogeosciences, 15,https: Short summary Rewetting drained peatlands may lead to prolonged emission of the greenhouse gas methane, gunnar the underlying factors are not well described. In this study, we found two rewetted fens with known high methane fluxes had a high ratio of microbial methane producers to methane consumers and a low abundance of methane consumers compared to pristine wetlands.
We therefore suggest abundances of methane-cycling microbes as potential indicators for prolonged high methane emissions in rewetted peatlands. Short summary We explored the timing of the peak of the short annual growing season in tundra ecosystems as indicated by an extensive suite of satellite indicators of vegetation productivity. Delayed peak greenness compared to peak photosynthesis is consistently found across years and land-cover classes. Plants also experience growth after optimal conditions for assimilation regarding light and temperature have passed.
Our results have implications for the modelling of the circumpolar carbon balance. Short summary In natural coastal wetlands, high supplies of marine sulfate suppress methanogenesis. We found these natural methane suppression mechanisms to be suspended by humane interference in a brackish wetland. Here, dyking and freshwater rewetting had caused a distinct freshening and an efficient depletion of the sulfate reservoir which opened up favorable conditions for a prospering methanogenic community.
Our results demonstrate how disturbance can turn coastal wetlands to distinct methane sources. Grigoriev, and Lars Kutzbach.
Short summary We present a multiannual time series of land—atmosphere carbon dioxide fluxes measured in situ with the eddy covariance technique in the Siberian Arctic. In arctic permafrost regions, climate—carbon feedbacks are amplified. Therefore, increased efforts to better represent these regions in global climate models have been made in recent years. Up to now, the available data base of in situ measurements from the Arctic was biased towards Alaska, records from the Eurasian Arctic were scarce.
Short summary We present new in-flight calibration procedures for airborne turbulence measurements that exploit suitable regular flight legs without the need for dedicated calibration patterns. Furthermore we estimate the accuracy of the airborne wind measurement and of the turbulent fluxes of the traces gases methane and carbon dioxide. Short summary In order to support the evaluation of coupled atmospheric—land-surface models we investigated spatial patterns of energy fluxes in relation to land-surface properties and upscaled airborne flux measurements to high resolution flux maps.
A machine learning technique allows us to estimate environmental response functions between spatially and temporally resolved flux observations and corresponding biophysical and meteorological drivers.
Short summary Drainage often turns peatlands into C sources. We measured C dynamics of a drained forested boreal peatland over 4 years, including one with a drought during growing season. The drained peatland ecosystem was a strong sink of C in all studied years.
Also, the peat soil sequestered C.
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A drought period in one summer significantly decreased C sequestration through decreased gross primary production, but since the drought also decreased ecosystem respiration, the site remained a C sink.
Short summary To support C exchange measurements, we examined plant and soil attributes in Siberian Arctic tundra. Our results illustrate a typical gogso ecosystem with great spatial variation. Mosses dominate plant biomass and control many soil attributes such as temperature, but variation in moss biomass is difficult to capture by remote sensing.
This indicates challenges in spatial extrapolation of some of those plant and soil attributes that geedeon relevant for regional ecosystem and global climate models. Short summary We compared two different fast-response humidity sensors simultaneously on different airborne platforms.
One is a particular, well-establed Lyman-alpha hygrometer that has gynnar used for decades as the standard for fast airborne humidity measurements. However, it is not available any more.
For an environment of low vibrations, the LI-COR sensor is suitable for fast airborne water vapour measurements. Short summary We analyzed ecosystem-scale measurements of methane exchange between Arctic tundra and the atmosphere, taking into account the large variations in vegetation and soil properties. The measurements are spatial averages, but using meteorological and statistical modelling techniques we could estimate methane emissions for different land cover types and quantify how gedeom the measurements correspond to the spatial variability.
This provides a more accurate estimate of the regional methane emission. Short summary Our work systematically quantifies extreme heat and drought event impacts on gross primary productivity GPP and ecosystem respiration globally across a wide range of ecosystems. We show that heat extremes typically increased mainly respiration whereas drought decreased both fluxes.
Combined heat and drought extremes had opposing effects offsetting each other for respiration, but there were also strong reductions in GPP and hence the strongest reductions in the ecosystems carbon sink capacity. Euskirchen, Krzysztof Fortuniak, Lawrence B. Short summary Northern peatlands store large amount of soil carbon and are vulnerable to climate change. The model was evaluated against EC measurements from 30 northern peatland sites.
Water table depth was not well predicted but had only small influence on simulated Ugnnar. Data, 10,https: Short summary Monitoring ecosystems using low-cost time lapse cameras has gained wide interest among researchers worldwide.
Quantitative information stored in image pixels can be analysed automatically to track time-dependent phenomena, e. As such, cameras can provide valuable ground references to earth observation. Here we document the ecosystem camera network we established to Finland and publish time series of images recorded between — Yonghong Yi, John S.
Chen, Mahta Moghaddam, Rolf H.
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The Cryosphere, 12,https: Short summary An important feature of the Arctic geveon large spatial heterogeneity in active layer conditions. We developed a modeling framework integrating airborne longwave radar and satellite data to investigate active layer thickness ALT sensitivity to landscape heterogeneity in Alaska.
We find uncertainty in spatial and vertical distribution of soil organic carbon is the largest factor affecting ALT accuracy. Advances in remote sensing of soil conditions will enable more accurate ALT predictions. Short summary Wetlands are one of the most significant natural sources of the strong greenhouse gas methane. We developed gwdeon model that can be used within a larger wetland carbon model to simulate the methane emissions. Gogo this study, we present the model and results of its testing.
We found that the model works well with different settings and that the results depend primarily on the rate of input anoxic soil respiration and also on factors that affect the simulated oxygen concentrations in the wetland soil. Biogeosciences, 14,https: Short summary The quantitative importance of northern lakes in terrestrial carbon budgets is uncertain, as year-round observations of carbon fluxes are rare.
We measured CH 4 and CO 2 fluxes from a subarctic lake and nearby fen during 2. We identified drivers of seasonal variability in gunmar fluxes and show the importance of winter and spring for annual carbon exchange in both ecosystems.
The lake as a source of atmospheric carbon partially compensates the fen carbon sink. Short summary Earth system models ESMs are our main tools for understanding future climate. The Arctic is important for the future carbon cycle, particularly due to the vunnar carbon stocks in permafrost. We evaluated the performance of the land component of three major ESMs at Arctic tundra sites, focusing on the fluxes and stocks of carbon.
We show that the next steps for model improvement are to geseon represent vegetation dynamics, to include mosses and to improve below-ground carbon cycle processes. Tubiello, Simona Castaldi, Gdeon B. Jackson, Mihai Alexe, Vivek K. Beerling, Peter Bergamaschi, Donald R.
The changes in emissions are discussed both in terms of trends and quasi-decadal changes. The ensemble gathered here allows us to synthesise the robust changes in terms of regional and sectorial contributions to the increasing methane emissions.