Перегляд за Автор "Gashe, R."

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  • Ескіз
    Документ
    Ambiemt NOx concentration above bare soil in southern Ukraine.
    (2013-05) Medinets, Sergiy V.; Medinets, Volodymyr I.; Butterbach-Bahl, K.; Gashe, R.; Pitsyk, Vasyl Z.; Skiba, U. M.; Пицык, Василий Зиновьевич; Піцик, Василь Зіновійович
    Determination of NOx level at surface atmosphere is timely and urgent task for agricultural regions worldwide and was our main target during this study.
  • Ескіз
    Документ
    Flux measurements of NOx in arable soil under dripping fertilization condition
    (Budapest: Project ECLAIRE, 2014-10) Medinets, Sergiy V.; Gashe, R.; Skiba, U. M.; Butterbach-Bahl, K.; Medinets, Volodymyr I.; Медінець, Володимир Іванович; Мединец, Владимир Иванович; Медінець, Сергій Володимирович; Мединец, Сергей Владимирович
    The aim of this study is to discuss appropriate design of measurements, characterize magnitude of NOx exchange during the long-term measurements and identify the main controlling factors for agricultural land, located on southern chernozems (black soils) in the South of Ukraine.
  • Ескіз
    Документ
    NO/NO2 fluxes measurement experience in arable land in Dniester catchment.
    (2013-05) Medinets, Sergiy V.; Medinets, Volodymyr I.; Butterbach-Bahl, K.; Gashe, R.; Pitsyk, Vasyl Z.; Skiba, U. M.; Пицык, Василий Зиновьевич; Піцик, Василь Зіновійович
    Flux measurement time episode (19.09-05.10.2012) was presented in this study to demonstrate possibility of system, an importance and complexity of exchange evaluation of NOx fluxes. Measurement period on field site has started from rather high emission rate, following perturbation of surface top layer of soil, with gradual reduction of emission probably due to declining microbial activity.
  • Ескіз
    Документ
    Surface ozone concentration measurement episode above bare soil in the Southern Ukraine.
    (Odesa: Pechatniy dom, 2013, 2013-05) Medinets, Sergiy V.; Medinets, Volodymyr I.; Butterbach-Bahl, K.; Gashe, R.; Pitsyk, Vasyl Z.; Skiba, U. M.
    The main purpose of our investigation is to study ambient O3 concentration levels and determine diurnal and seasonal course in typical agricultural area in the southern Ukraine.
  • Ескіз
    Документ
    The impact of management and climate on soil nitric oxide fluxes from arable land in the Southern Ukraine.
    (Amsterdam, Netherlands: Elsevier, 2016) Medinets, Sergiy V.; Gashe, R.; Skiba, U. M.; Medinets, Volodymyr I.; Butterbach-Bahl, K.
    NO fluxes from soils are a significant source for tropospheric NOx, though global and regional estimates of the soil source strength are constrained by the paucity of measurements. In a continuous 18 month effort (2012e2014) soil NO fluxes from an intensively managed arable site in the black soil region of the Southern Ukraine (Odessa region) were measured using an automated dynamic chamber system. Measurements revealed three periods of peak NO emissions (fertigation, re-wetting of soils, and to a lower extend during winter), with a pulse emission peak during soil re-wetting in summer of 88.4 mg Nm_2 h_1. The mean annual NO flux was 5.1 ± 8.9 mg N m_2 h_1 and total annual NO emissions were 0.44 ± 0.78 kg N ha_1 yr_1. The fertilizer induced emission factor for NO was 0.63% under beetroot. The combined effect of soil temperature, soil moisture and soil DIN (NH4 and NO3) concentrations were identified as drivers of the temporal and spatial variability of soil NO fluxes. This work shows that longterm measurements are needed for estimating annual fluxes and the importance of soils as a source for tropospheric NOx as the contribution of different seasons and crop growing periods to the annual budget differed markedly.