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  1. AU="Genki Katata"
  2. AU="Kseniya Shuturminska"
  3. AU="Herzler, Matthias"
  4. AU=Godfrey W A
  5. AU="Jester, Rebecca"
  6. AU="Olivier Potvin"
  7. AU="Rombos, Antonis"
  8. AU="Kristiansson, Erik"
  9. AU="Tanous, Fadi"
  10. AU="Zeng, Fa-Min"
  11. AU="Kapusta, Andrzej"
  12. AU=Hebron Michaeline
  13. AU="Delfini, Ana Cláudia"
  14. AU="Barham, Lawrence"

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  1. Artikel: Impacts of C-uptake by plants on the spatial distribution of 14C accumulated in vegetation around a nuclear facility—Application of a sophisticated land surface 14C model to the Rokkasho reprocessing plant, Japan

    Ota, Masakazu / Genki Katata / Haruyasu Nagai / Hiroaki Terada

    Journal of environmental radioactivity. 2016 Oct., v. 162-163

    2016  

    Abstract: The impacts of carbon uptake by plants on the spatial distribution of radiocarbon (14C) accumulated in vegetation around a nuclear facility were investigated by numerical simulations using a sophisticated land surface 14C model (SOLVEG-II). In the ... ...

    Abstract The impacts of carbon uptake by plants on the spatial distribution of radiocarbon (14C) accumulated in vegetation around a nuclear facility were investigated by numerical simulations using a sophisticated land surface 14C model (SOLVEG-II). In the simulation, SOLVEG-II was combined with a mesoscale meteorological model and an atmospheric dispersion model. The model combination was applied to simulate the transfer of 14CO2 and to assess the radiological impact of 14C accumulation in rice grains during test operations of the Rokkasho reprocessing plant (RRP), Japan, in 2007. The calculated 14C-specific activities in rice grains agreed with the observed activities in paddy fields around the RRP within a factor of four. The annual effective dose delivered from 14C in the rice grain was estimated to be less than 0.7 μSv, only 0.07% of the annual effective dose limit of 1 mSv for the public. Numerical experiments of hypothetical continuous atmospheric 14CO2 release from the RRP showed that the 14C-specific activities of rice plants at harvest differed from the annual mean activities in the air. The difference was attributed to seasonal variations in the atmospheric 14CO2 concentration and the growth of the rice plant. Accumulation of 14C in the rice plant significantly increased when 14CO2 releases were limited during daytime hours, compared with the results observed during the nighttime. These results indicated that plant growth stages and diurnal photosynthesis should be considered in predictions of the ingestion dose of 14C for long-term chronic releases and short-term diurnal releases of 14CO2, respectively.
    Schlagwörter air ; carbon ; developmental stages ; ingestion ; mathematical models ; paddies ; photosynthesis ; plant growth ; prediction ; radioactivity ; radionuclides ; rice ; seasonal variation ; vegetation ; Japan
    Sprache Englisch
    Erscheinungsverlauf 2016-10
    Umfang p. 189-204.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 1483112-0
    ISSN 1879-1700 ; 0265-931X
    ISSN (online) 1879-1700
    ISSN 0265-931X
    DOI 10.1016/j.jenvrad.2016.05.032
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  2. Artikel: Development of the Eulerian atmospheric transport model GEARN-FDM: Validation against the European tracer experiment

    Kadowaki, Masanao / Genki Katata / Haruyasu Nagai / Hiroaki Terada

    Turkish National Committee for Air Pollution Research and Control Atmospheric Pollution Research. 2016,

    2016  

    Abstract: In this study, we developed an atmospheric dispersion model based on the finite difference method (GEARN-FDM) to simulate long-range radiological dispersion. The model includes a mass conservation and monotonic advection scheme and a horizontal diffusion ...

    Abstract In this study, we developed an atmospheric dispersion model based on the finite difference method (GEARN-FDM) to simulate long-range radiological dispersion. The model includes a mass conservation and monotonic advection scheme and a horizontal diffusion scheme based on the deformation of the resolved horizontal wind. Meteorological fields in calculating dispersion were simulated by the Advanced Research Weather Research and Forecasting (WRF) model. ERA-interim reanalysis was used for the WRF nudging calculation. By using tracer gas concentrations from the European tracer experiment, the GEARN-FDM performance could be tested. The results indicated high performance with factors of 2 and 5 of 37% and 72%, respectively. To investigate the impact of horizontal diffusivity on the concentration distribution, we examined an additional simulation run using GEARN-FDM with a constant value of horizontal diffusivity. In comparison with the additional run, the plume calculated in the original GEARN-FDM run was locally and temporally diluted due to large horizontal diffusivity in a mountainous region. Therefore, geographical heterogeneity of horizontal diffusivity may affect regional-scale atmospheric dispersion simulations.
    Schlagwörter advection ; air pollution ; deformation ; diffusivity ; models ; wind
    Sprache Englisch
    Umfang p. .
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    Anmerkung Pre-press version
    ZDB-ID 2645757-X
    ISSN 1309-1042
    ISSN 1309-1042
    DOI 10.1016/j.apr.2016.10.012
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  3. Artikel: Altitudinal characteristics of atmospheric deposition of aerosols in mountainous regions: Lessons from the Fukushima Daiichi Nuclear Power Station accident

    Sanada, Yukihisa / Genki Katata / Naoki Kaneyasu / Chika Nakanishi / Yoshimi Urabe / Yukiyasu Nishizawa

    Science of the total environment. 2018 Mar. 15, v. 618

    2018  

    Abstract: To understand the formation process of radiologically contaminated areas in eastern Japan caused by the Fukushima Daiichi Nuclear Power Station (FDNPS) accident, the deposition mechanisms over complex topography are the key factors to be investigated. To ...

    Abstract To understand the formation process of radiologically contaminated areas in eastern Japan caused by the Fukushima Daiichi Nuclear Power Station (FDNPS) accident, the deposition mechanisms over complex topography are the key factors to be investigated. To characterize the atmospheric deposition processes of radionuclides over complex mountainous topography, we investigated the altitudinal distributions of the radiocesium deposited during the accident. In five selected areas, altitudinal characteristics of the air dose rates observed using airborne surveys were analyzed. To examine the deposition mechanisms, we supplementarily used vertical profiles of radiocesium deposition in each area calculated in the latest atmospheric dispersion model. In southern Iwate, the vertical profile of the observed air dose rate was uniform regardless of altitude. In western Tochigi, the areas with the highest levels of contamination were characteristically distributed in the middle of the mountains, while in southern Fukushima, the areas with the highest contamination levels were enhanced near the summits of mountains. In central Fukushima, high air dose rates were limited to the bottoms of basin-like valley. In the region northwest of FDNPS, the air dose rate was the highest at the bottom of valley topography and decreased gradually with altitude. The simulation results showed that calculated wet deposition and observed vertical profiles of total deposition were similar in areas of southern Iwate and northwest of FDNPS qualitatively, suggesting that the dominant deposition mechanism was wet deposition. In contrast, the atmospheric dispersion model failed to reproduce either the timing of precipitation events or vertical profiles of radiocesium deposition in three other areas. Although it was difficult to elucidate the deposition mechanisms in these areas due to uncertainties of the present model results, potential mechanisms such as cloud water deposition were still proposed based on circumstantial evidences of limited meteorological data during the early stage of the accident.
    Schlagwörter accidents ; aerosols ; air ; altitude ; meteorological data ; models ; mountains ; nuclear power ; power plants ; radionuclides ; surveys ; uncertainty ; wet deposition ; Japan
    Sprache Englisch
    Erscheinungsverlauf 2018-0315
    Umfang p. 881-890.
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2017.08.246
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    Verfügbar in ZB MED Köln/Königswinter

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  4. Artikel: Long-term observation of fog chemistry and estimation of fog water and nitrogen input via fog water deposition at a mountainous site in Hokkaido, Japan

    Yamaguchi, Takashi / Genki Katata / Hiroshi Furutani / Izumi Noguchi / Mitsuo Uematsu / Shigekatsu Sakai / Yoko Watanabe

    Atmospheric research. 2015 Jan. 01, v. 151

    2015  

    Abstract: To evaluate water and nitrogen input via fog deposition, the fog water chemistry and deposition around a crater lake (Lake Mashu) in northern Japan were investigated in the growing seasons of trees (summer to autumn) in 2006–2012. The fog samples were ... ...

    Abstract To evaluate water and nitrogen input via fog deposition, the fog water chemistry and deposition around a crater lake (Lake Mashu) in northern Japan were investigated in the growing seasons of trees (summer to autumn) in 2006–2012. The fog samples were collected using an active fog collector and droplet size distribution was measured with a droplet size spectrometer (FM-100). The visibility (VIS)–liquid water content of fog (LWC) relationship differed between summer and autumn. Large fog droplets decreased in autumn and the calculated LWC from FM-100 measurements (LWCobs) were lower than those in summer at the same VIS. Two empirical curves between LWCobs and VIS were obtained and used for better estimation of fog deposition. Fog deposition was calculated from LWC empirically derived from past VIS data and deposition velocity (Vd) estimated using wind speed and vegetation parameters. The mean pH of fog water was 4.6 and the percentage of samples of pH4.0 or more was 93%. Compared to previous literature of exposure experiments of acid mist on plants, fog acidity in this study did not seem to injure plant leaves. The water input via fog deposition accumulated for each growing season was estimated at 107–140mm, corresponding to 18–23% of the precipitation in the same period. Nitrogen deposition via fog deposition in a plant growing season was estimated at 26–30meqm−2 (3.6–4.2kg Nha−1). As a long-term trend, NO3− concentration in fog water decreased significantly. However, the long-term trends of fog and nitrogen depositions were not clear.
    Schlagwörter acidity ; autumn ; droplet size ; droplets ; growing season ; hydrochemistry ; lakes ; leaves ; nitrates ; nitrogen ; pH ; spectrometers ; summer ; trees ; vegetation ; water content ; wind speed ; Japan
    Sprache Englisch
    Erscheinungsverlauf 2015-0101
    Umfang p. 82-92.
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ISSN 0169-8095
    DOI 10.1016/j.atmosres.2014.01.023
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  5. Artikel: Immediate and potential long-term effects of consecutive heat waves on the photosynthetic performance and water balance in Douglas-fir

    Duarte, André G / Almut Arneth / Genki Katata / Jürgen Kreuzwieser / Mohitul Hossain / Nadine K. Ruehr / Yasutomo Hoshika

    Journal of plant physiology. 2016 Oct. 20, v. 205

    2016  

    Abstract: The frequency and intensity of climatic extremes, such as heat waves, are predicted to increase globally, with severe implications for terrestrial carbon and water cycling. Temperatures may rise above critical thresholds that allow trees to function ... ...

    Abstract The frequency and intensity of climatic extremes, such as heat waves, are predicted to increase globally, with severe implications for terrestrial carbon and water cycling. Temperatures may rise above critical thresholds that allow trees to function optimally, with unknown long-term consequences for forest ecosystems. In this context, we investigated how photosynthetic traits and the water balance in Douglas-fir are affected by exposure to three heat waves with temperatures about 12°C above ambient. Photosynthetic carboxylation efficiency (Vcmax) was mostly unaffected, but electron transport (Jmax) and photosynthetic rates under saturating light (Asat) were strongly influenced by the heat waves, with lagging limitations on photosynthesis still being observed six weeks after the last heat wave. We also observed lingering heat-induced inhibitions on transpiration, minimum stomatal conductance, and night-time stomatal conductance (gs-night). Results from the stomatal models used to calculate minimum stomatal conductance were similar to gs-night and indicated changes in leaf morphology, e.g. stomatal occlusions and alterations in epicuticular wax. Our results show Douglas-fir’s ability to restrict water loss following heat stress, but at the price of reduced photosynthetic performance. Such limitations indicate potential long-term restrictions that heat waves can impose on tree development and functioning under extreme climatic conditions.
    Schlagwörter carbon ; carboxylation ; climatic factors ; electron transfer ; epicuticular wax ; forest ecosystems ; heat ; heat stress ; leaves ; long term effects ; models ; photosynthesis ; prices ; Pseudotsuga menziesii ; stomatal conductance ; temperature ; trees ; water balance
    Sprache Englisch
    Erscheinungsverlauf 2016-1020
    Umfang p. 57-66.
    Erscheinungsort Elsevier GmbH
    Dokumenttyp Artikel
    ZDB-ID 283647-6
    ISSN 1618-1328 ; 0176-1617
    ISSN (online) 1618-1328
    ISSN 0176-1617
    DOI 10.1016/j.jplph.2016.08.012
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    Verfügbar in ZB MED Bonn

    Z 46/302: Hefte anzeigen

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  6. Artikel ; Online: Aerosol Deposition and Behavior on Leaves in Cool-temperate Deciduous Forests. Part 3

    Genki Katata / Takashi Yamaguchi / Haruna Sato / Yoko Watanabe / Izumi Noguchi / Hiroshi Hara / Haruyasu Nagai

    Asian Journal of Atmospheric Environment, Vol 7, Iss 1, Pp 17-

    Estimation of Fog Deposition onto Cool-temperate Deciduous Forest by the Inferential Method

    2013  Band 24

    Abstract: Fog deposition onto the cool-temperate deciduous forest around Lake Mashu in northern Japan was estimated by the inferential method using the parameterizations of deposition velocity and liquid water content of fog (LWC). Two parameterizations of fog ... ...

    Abstract Fog deposition onto the cool-temperate deciduous forest around Lake Mashu in northern Japan was estimated by the inferential method using the parameterizations of deposition velocity and liquid water content of fog (LWC). Two parameterizations of fog deposition velocity derived from field experiments in Europe and numerical simulations using a detailed multi-layer atmosphere-vegetation-soil model were tested. The empirical function between horizontal visibility (VIS) and LWC was applied to produce hourly LWC as an input data for the inferential method. Weekly mean LWC computed from VIS had a good correlation with LWC sampled by an active string-fog collector. By considering the enhancement of fog deposition due to the edge effect, fog deposition calculated by the inferential method using two parameterizations of deposition velocity agreed with that computed from throughfall data. The results indicated that the inferential method using the current parameterizations of deposition velocity and LWC can provide a rough estimation of water input due to fog deposition onto cool-temperature deciduous forests. Limitations of current parameterizations of deposition velocity related to wind speed, evaporation loss of rain and fog droplets intercepted by tree canopies, and leaf area index were discussed.
    Schlagwörter fog deposition ; inferential method ; parameterization ; visibility ; liquid water content ; deposition velocity ; deciduous forest ; leaf area index ; Environmental technology. Sanitary engineering ; TD1-1066 ; Environmental sciences ; GE1-350
    Thema/Rubrik (Code) 660
    Sprache Englisch
    Erscheinungsdatum 2013-03-01T00:00:00Z
    Verlag Asian Association for Atmospheric Environment
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  7. Artikel ; Online: Aerosol Deposition and Behavior on Leaves in Cool-temperate Deciduous Forests. Part 2

    Takashi Yamaguchi / Izumi Noguchi / Yoko Watanabe / Genki Katata / Haruna Sato / Hiroshi Hara

    Asian Journal of Atmospheric Environment, Vol 7, Iss 1, Pp 8-

    Characteristics of Fog Water Chemistry and Fog Deposition in Northern Japan

    2013  Band 16

    Abstract: The fog water chemistry and deposition in northern Japan were investigated by fog water and throughfall measurements in 2010. Fog water was sampled weekly by an active-string fog sampler at Lake Mashu from May to November. Throughfall measurements were ... ...

    Abstract The fog water chemistry and deposition in northern Japan were investigated by fog water and throughfall measurements in 2010. Fog water was sampled weekly by an active-string fog sampler at Lake Mashu from May to November. Throughfall measurements were conducted using rain gauges under three deciduous trees along the somma of the lake from August to October. The mean fog deposition rate (flux) was calculated using throughfall data to estimate the total fog water deposition amount for the entire sampling period. NH4+ and SO42- were the most abundant cation and anion, respectively, in the fog water samples. A mean pH of 5.08 in the fog water, which is higher than those in rural areas in Japan, was observed. The [NH4+]/[SO42-] equivalent ratio in fog water was larger than 1.0 throughout the study period, indicating that NH3 gas was the primary neutralizing agent for fog water acidity. The mean rate and total amount of fog water deposition were estimated as 0.15 mm h-1 and 164 mm, respectively. The amounts of nitrogen and sulfate deposition via fog water deposition were corresponded to those reported values of the annual deposition amounts via rainfall.
    Schlagwörter aerosol ; fog chemistry ; fog deposition ; throughfall ; nitrogen deposition ; cool-temperate deciduous forest ; Environmental technology. Sanitary engineering ; TD1-1066 ; Environmental sciences ; GE1-350
    Sprache Englisch
    Erscheinungsdatum 2013-03-01T00:00:00Z
    Verlag Asian Association for Atmospheric Environment
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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