Panferov, Oleg I.

[["dc.bibliographiccitation.firstpage","746"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Agricultural and Forest Meteorology"],["dc.bibliographiccitation.lastpage","754"],["dc.bibliographiccitation.volume","151"],["dc.contributor.author","Sogachev, A."],["dc.contributor.author","Panferov, Oleg"],["dc.contributor.author","Ahrends, Bernd"],["dc.contributor.author","Doering, C."],["dc.contributor.author","Jorgensen, H. E."],["dc.date.accessioned","2018-11-07T08:55:06Z"],["dc.date.available","2018-11-07T08:55:06Z"],["dc.date.issued","2011"],["dc.description.abstract","There are many natural and anthropogenic reasons why a gap can occur inside the forest. When a gap appears within a studied stand (e.g. near a flux tower which operated for some time, providing information about the ecosystem-atmosphere exchange), an assessment of new measurement conditions should be carried out. Using a three-dimensional approach for footprint estimation based on numerical solution of Reynolds-Averaged Navier-Stokes (RANS) equations, we investigated possible changes in air flow and CO2 flux footprints resulting from two suggested forest management activities - clear-cut and stripe-cut - around the flux tower located in 130-year-old spruce forest in the Soiling highland, Germany. The model results show that degree of changes in flux footprints depends on the chosen management strategy. The clear-cut strategy produces the largest changes and the stripe-cut leads to weaker changes of investigated characteristics. The role of remote canopy sources increases, while the contribution of remote soil sources decreases with increased share of removed trees. In general, the investigated characteristics change differently for summer and winter due to the combined effects of phenology and upwind topography. (C) 2010 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.agrformet.2010.10.010"],["dc.identifier.isi","000290193500009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22827"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","International Conference on Atmospheric Transport and Chemistry in Forest Ecosystems"],["dc.relation.eventlocation","Bayreuth, GERMANY"],["dc.relation.issn","0168-1923"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.title","Numerical assessment of the effect of forest structure changes on CO2 flux footprints for the flux tower in Soiling, Germany"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","169"],["dc.bibliographiccitation.issue","2-4"],["dc.bibliographiccitation.journal","Theoretical and Applied Climatology"],["dc.bibliographiccitation.lastpage","185"],["dc.bibliographiccitation.volume","80"],["dc.contributor.author","Sogachev, A."],["dc.contributor.author","Panferov, Oleg"],["dc.contributor.author","Gravenhorst, Gode"],["dc.contributor.author","Vesala, Timo"],["dc.date.accessioned","2018-11-07T11:14:18Z"],["dc.date.available","2018-11-07T11:14:18Z"],["dc.date.issued","2005"],["dc.description.abstract","A model for the canopy - planetary boundary layer flow and scalar transport based on E-is an element of closure was applied to estimate footprint for CO2 fluxes over different inhomogeneous landscapes. Hypothetical heterogeneous vegetation patterns - forest with clear-cuts as well as hypothetical heterogeneous relief - a bell-shaped valley and a ridge covered by forest were considered. The distortions of airflow caused by these heterogeneities are shown - the upwind deceleration of the flow at the ridge foot and above valley, acceleration at the crest and the flow separation with the reversed flow pattern at lee slopes of ridge and valley. The disturbances induce changes in scalar flux fields within the atmospheric surface layer comparing to fluxes for homogeneous conditions: at a fixed height the fluxes vary as a function of distance to disturbance. Correspondingly, the flux footprint estimated from model data depends oil the location of the point of interest (flux measurement point) and may significantly deviate from that for a flat terrain. It is shown that proposed method could be used for the choice of optimal sensor position for flux measurements over complex terrain as well as for the interpretation of data for existing measurement sites. To illustrate the latter the method was applied for experimental site in Selling, Germany, taking into account the complex topography and vegetation heterogeneities. Results show that in certain situations (summer, neutral stratification, south or north wind) and for a certain sensor location the assumptions of idealized air flow structure could be used for measurement interpretation at this site, though in general, extreme caution should be applied when analytical footprint models are used in the interpretation of flux measurements over complex sites."],["dc.identifier.doi","10.1007/s00704-004-0098-8"],["dc.identifier.isi","000229478000008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54093"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Vienna"],["dc.relation.conference","Joint Meeting of the European-Geophysical-Society/American-Geophysical-Union and European-Union-of-Geoscience"],["dc.relation.eventlocation","Nice, FRANCE"],["dc.relation.issn","0177-798X"],["dc.title","Numerical analysis of flux footprints for different landscapes"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3046"],["dc.bibliographiccitation.issue","21"],["dc.bibliographiccitation.journal","Ecological Modelling"],["dc.bibliographiccitation.lastpage","3056"],["dc.bibliographiccitation.volume","220"],["dc.contributor.author","Olchev, A."],["dc.contributor.author","Radler, K."],["dc.contributor.author","Sogachev, A."],["dc.contributor.author","Panferov, Oleg"],["dc.contributor.author","Gravenhorst, Gode"],["dc.date.accessioned","2018-11-07T11:22:09Z"],["dc.date.available","2018-11-07T11:22:09Z"],["dc.date.issued","2009"],["dc.description.abstract","A three-dimensional model Mixfor-3D of soil-vegetation-atmosphere transfer (SVAT) was developed and applied to estimate possible effects of tree clear-cutting on radiation and soil temperature regimes of a forest ecosystem. The Mixfor-31D model consists of several closely coupled 3D sub-models describing: forest stand structure; radiative transfer in a forest canopy; turbulent transfer of sensible heat, H(2)O and CO(2) between ground surface and the atmospheric surface layer; evapotranspiration of ground surface vegetation and soil; heat and moisture transfer in soil. The model operates with the horizontal grid resolution, 2 m x 2 m; vertical resolution, 1 m and primary time step, 1 h. The model was tested against meteorological data obtained at a small clear-cutting area in Otterbach in central Germany during summer 2005. The meteorological data including air temperature and humidity, precipitation, solar radiation, wind speed and direction, soil temperatures at 10 and 20 cm depth were measured by five automatic stations within the clear-cut area. One reference station was placed about 100 m from the clear-cut inside the forest stand. Comparisons of modelled and measured solar radiation fluxes and soil temperature profiles showed that the model adequately describes the spatial heterogeneity and dynamics of these variables under different weather conditions. The model can be used to explore solar radiation and soil temperature patterns within heterogeneous forest plots, with applications to various silvicultural tasks. (C) 2009 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.ecolmodel.2009.02.004"],["dc.identifier.isi","000272332900021"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55933"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","6th European Conference on Ecological Modelling, Challenges for Ecological Modelling in a Changing World"],["dc.relation.eventlocation","Trieste, ITALY"],["dc.relation.issn","0304-3800"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.title","Application of a three-dimensional model for assessing effects of small clear-cuttings on radiation and soil temperature"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]