The Experts below are selected from a list of 295026 Experts worldwide ranked by ideXlab platform

Fabiana T Moreira - One of the best experts on this subject based on the ideXlab platform.

  • three Dimensional Distribution of plastic pellets in sandy beaches shifting paradigms
    Scientific Reports, 2015
    Co-Authors: Alexander Turra, Aruana B Manzano, Rodolfo Jasao Soares Dias, Michel Michaelovitch De Mahiques, Lucas Barbosa, Danilo Balthazarsilva, Fabiana T Moreira
    Abstract:

    Plastic pellets are worldwide contaminants that accumulate in the ocean, especially in sandy beaches, where their historic standing-stock quantification relies on surface sediment samples. We demonstrated these particles present a three-Dimensional instead of a simple along-across shore Distribution, being found as deep as 2.0 m, with surface layers accounting for <10% of the total abundance in the sediment column. This gradient seemed to be more related to oceanographic rather than anthropic processes, suggesting a general pattern whose applicability to microplastics and sedimentary environments as a whole should be investigated. This poses criticism in the exactness of standing-stock records and demands urgent discussion of sampling protocols.

Wilfried Haeberli - One of the best experts on this subject based on the ideXlab platform.

  • three Dimensional Distribution and evolution of permafrost temperatures in idealized high mountain topography
    Journal of Geophysical Research, 2007
    Co-Authors: Jeannette Noetzli, Stephan Gruber, Thomas Kohl, Nadine Salzmann, Wilfried Haeberli
    Abstract:

    [1] Permafrost degradation is regarded as a crucial factor influencing the stability of steep rockwalls in alpine areas. Discernment of zones of fast temperature changes requires knowledge about the temperature Distribution and evolution at and below the surface of steep rock. In complex high-mountain topography, strong lateral heat fluxes result from topography and variable surface temperatures and profoundly influence the subsurface thermal field. To investigate such three-Dimensional effects, numerical experimentation was conducted using typical idealized geometries of high-mountain topography, such as ridges, peaks, or spurs. The approach combines a surface energy balance model with a three-Dimensional ground heat conduction scheme to investigate belowground temperature Distribution and permafrost occurrence in high-mountain topography. Time-dependent simulations are based on scenario data gained from regional climate models. Results indicate complex three-Dimensional patterns of temperature Distribution and heat flow density below mountainous topography for equilibrium conditions, which are additionally perturbed by transient effects. Permafrost occurs at many locations where temperatures at the surface do not indicate it, e.g., on the south face of ridges or below the edges of a peak. The modeling tools applied have potential for a number of studies in high mountains addressing questions related to permafrost Distribution and evolution at depth in real topographies, for instance, the reanalysis of temperature-related instabilities.

Alexander Turra - One of the best experts on this subject based on the ideXlab platform.

  • three Dimensional Distribution of plastic pellets in sandy beaches shifting paradigms
    Scientific Reports, 2015
    Co-Authors: Alexander Turra, Aruana B Manzano, Rodolfo Jasao Soares Dias, Michel Michaelovitch De Mahiques, Lucas Barbosa, Danilo Balthazarsilva, Fabiana T Moreira
    Abstract:

    Plastic pellets are worldwide contaminants that accumulate in the ocean, especially in sandy beaches, where their historic standing-stock quantification relies on surface sediment samples. We demonstrated these particles present a three-Dimensional instead of a simple along-across shore Distribution, being found as deep as 2.0 m, with surface layers accounting for <10% of the total abundance in the sediment column. This gradient seemed to be more related to oceanographic rather than anthropic processes, suggesting a general pattern whose applicability to microplastics and sedimentary environments as a whole should be investigated. This poses criticism in the exactness of standing-stock records and demands urgent discussion of sampling protocols.

Stephan Gruber - One of the best experts on this subject based on the ideXlab platform.

  • three Dimensional Distribution and evolution of permafrost temperatures in idealized high mountain topography
    Journal of Geophysical Research, 2007
    Co-Authors: Jeannette Noetzli, Stephan Gruber, Thomas Kohl, Nadine Salzmann, Wilfried Haeberli
    Abstract:

    [1] Permafrost degradation is regarded as a crucial factor influencing the stability of steep rockwalls in alpine areas. Discernment of zones of fast temperature changes requires knowledge about the temperature Distribution and evolution at and below the surface of steep rock. In complex high-mountain topography, strong lateral heat fluxes result from topography and variable surface temperatures and profoundly influence the subsurface thermal field. To investigate such three-Dimensional effects, numerical experimentation was conducted using typical idealized geometries of high-mountain topography, such as ridges, peaks, or spurs. The approach combines a surface energy balance model with a three-Dimensional ground heat conduction scheme to investigate belowground temperature Distribution and permafrost occurrence in high-mountain topography. Time-dependent simulations are based on scenario data gained from regional climate models. Results indicate complex three-Dimensional patterns of temperature Distribution and heat flow density below mountainous topography for equilibrium conditions, which are additionally perturbed by transient effects. Permafrost occurs at many locations where temperatures at the surface do not indicate it, e.g., on the south face of ridges or below the edges of a peak. The modeling tools applied have potential for a number of studies in high mountains addressing questions related to permafrost Distribution and evolution at depth in real topographies, for instance, the reanalysis of temperature-related instabilities.

Rodolfo Jasao Soares Dias - One of the best experts on this subject based on the ideXlab platform.

  • three Dimensional Distribution of plastic pellets in sandy beaches shifting paradigms
    Scientific Reports, 2015
    Co-Authors: Alexander Turra, Aruana B Manzano, Rodolfo Jasao Soares Dias, Michel Michaelovitch De Mahiques, Lucas Barbosa, Danilo Balthazarsilva, Fabiana T Moreira
    Abstract:

    Plastic pellets are worldwide contaminants that accumulate in the ocean, especially in sandy beaches, where their historic standing-stock quantification relies on surface sediment samples. We demonstrated these particles present a three-Dimensional instead of a simple along-across shore Distribution, being found as deep as 2.0 m, with surface layers accounting for <10% of the total abundance in the sediment column. This gradient seemed to be more related to oceanographic rather than anthropic processes, suggesting a general pattern whose applicability to microplastics and sedimentary environments as a whole should be investigated. This poses criticism in the exactness of standing-stock records and demands urgent discussion of sampling protocols.