258 research outputs found
Fluxnet Archive Product from Rosinedal-3
No full textArchive Product for Ecosystem Measurements. Fluxes, Meteo and ancillary measurements processed with the International standard FLUXNET procedure (ONEFlux suite) with different time aggregations.
Financial support from the Knut and Alice Wallenberg Foundation (Grant #2015.0047) and from the Swedish Infrastructure for Ecosystem Science (SITES) is acknowledged
See also:
https://doi.org/10.1016/j.agrformet.2016.08.002
Peichl, M., Nilsson, M.B., Pilegaard, K., de Simon, G., ICOS Ecosystem Thematic Centre, 2022. Warm winter 2020 ecosystem eddy covariance flux product from Rosinedal-3. https://doi.org/10.18160/RJ1S-CC2
Fluxnet Product from Rosinedal-3
No full textSubset of half-hourly Fluxes and Meteo measurements processed with the international standard FLUXNET procedure (ONEFlux suite) for fast plotting purposes. Full data available in the Archive product.
Financial support from the Knut and Alice Wallenberg Foundation (Grant #2015.0047) and from the Swedish Infrastructure for Ecosystem Science (SITES) is acknowledged
See also:
https://doi.org/10.1016/j.agrformet.2016.08.002
Ecosystem Thematic Centre, De Simon, G., Nilsson, M., Peichl, M., Pilegaard, K. (2021). Fluxnet Product from Rosinedal-3, 2013-12-31–2020-12-31, FLUXNET, https://hdl.handle.net/11676/eB7VoOGljshGM3SRVDt-hSZ
Determinants of terrestrial ecosystem carbon balance inferred from European eddy covariance flux sites
No full textpeer reviewedPioneering work in the last century has resulted in a widely accepted paradigm that primary production is strongly positively related to temperature and water availability such that the northern hemispheric forest carbon sink may increase under conditions of global warming. However, the terrestrial carbon sink at the ecosystem level (i.e. net ecosystem productivity, NEP) depends on the net balance between gross primary productivity (GPP) and ecosystem respiration ( TER). Through an analysis of European eddy covariance flux data sets, we find that the common climate relationships for primary production do not hold for NEP. This is explained by the fact that decreases in GPP are largely compensated by parallel decreases in TER when climatic factors become more limiting. Moreover, we found overall that water availability was a significant modulator of NEP, while the multivariate effect of mean annual temperature is small and not significant. These results indicate that climate- and particularly temperature-based projections of net carbon balance may be misleading. Future research should focus on interactions between the water and carbon cycles and the effects of disturbances on the carbon balance of terrestrial ecosystems
Biological monitoring of airborne deposition within and around the Ilimaussaq intrusion, Southwest Greenland
No full textThe lichen Cetraria nivalis and the moss Hylocomium splendens were sampled within and around the alkaline Ilimaussaq intrusion in Southwest Greenland as monitors of the deposition of airborne metals and other elements. The intrusion is rich in U, Th, rare earth elements and heavy metals. The samples were analysed by instrumental neutron activation analysis (Na, K, Sc, Cr, Fe, Co, Zn, As, Se, Br, Rb, Sr, Ag, Sb, Cs, La, Ce, Nd, Sm, Eu, Yb, Tb, Lu, Hf, Ta, W, Au, Hg, Th and U) and by atomic absorption spectrophotometry (Cd and Pb).
Many elements characteristic of the rock-intrusion were found in significantly higher concentrations in plant samples from the intrusion than elsewhere. A factor analysis for Cetraria (including 28 elements determined in >70% of all samples) shows that 5 factors account for 79% of the total variation. The first factor (accounting for 52% of the total variation) included the elements characteristic of the intrusion (prominent members: Sc, Fe, Rb, Cs, La, Ce, Nd, Sm, Eu, Tb, Yb, Lu, Hf, Ta, Pb, and Th). For Hylocomium (26 elements) 4 factors account for 87% of the total variation. The first factor explained 49% of the total variance and included: Fe, Zn, Rb, Cd, Cs, La, Ce, Sm, Eu, Tb, Yb, Hf, Ta, Pb, and Th.
The source of elements found in the monitor organisms is the rocks of the intrusion, which weather into fine-grained particles subject to wind transport. Preoperational monitoring (i.e. monitoring before mining activities) is essential in areas where exposed mineralizations can act as natural sources of pollution
Biological Monitoring of Airborne Deposition around Exposed Mineralizations in Greenland
No full textProcesses regulating nitric oxide emissions from soils
No full textNitric oxide (NO) is a reactive gas that plays an important role in atmospheric chemistry by influencing the production and destruction of ozone and thereby the oxidizing capacity of the atmosphere. NO also contributes by its oxidation products to the formation of acid rain. The major sources of NO in the atmosphere are anthropogenic emissions (from combustion of fossil fuels) and biogenic emission from soils. NO is both produced and consumed in soils as a result of biotic and abiotic processes. The main processes involved are microbial nitrification and denitrification, and chemodenitrification. Thus, the net result is complex and dependent on several factors such as nitrogen availability, organic matter content, oxygen status, soil moisture, pH and temperature. This paper reviews recent knowledge on processes forming NO in soils and the factors controlling its emission to the atmosphere. Schemes for simulating these processes are described, and the results are discussed with the purpose of scaling up to global emission
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