エアロゾル研究
Online ISSN : 1881-543X
Print ISSN : 0912-2834
ISSN-L : 0912-2834
最新号
選択された号の論文の10件中1~10を表示しています
特集「森林-大気系におけるエアロゾルの挙動」
研究論文
  • 竹谷 文一, 相田 真希, 関谷 高志, 山地 一代, 池田 恒平, 松本 和彦, 本多 牧生, 金谷 有剛
    2021 年 36 巻 1 号 p. 46-54
    発行日: 2021/03/20
    公開日: 2021/03/25
    ジャーナル フリー
    電子付録

    The sensitivity of ocean phytoplankton (chlorophyll-a concentration) to deposition of atmospheric inorganic nitrogen compounds over Japan Sea was investigated using a 3-D lower trophic-marine ecosystem model (COCO-NEMURO) combined with an atmospheric regional chemical transport model (WRF-CMAQ). The monthly mean values for the wet and dry deposition of inorganic nitrogen compounds including gases (HNO3 and NH3) and aerosol particles (NO3 and NH4) over the Japan Sea were determined using the WRF-CMAQ. The results indicated that the total flux of inorganic nitrogen compounds was in the range of 82–302 μmol/m2/day and wet deposition was dominant in all season. These values were input into the ocean surface in NEMURO as a new nitrogen nutrient source from atmosphere. The annual average of surface chlorophyll-a concentration over Japan Sea was increased from 0.26 to 0.35 mg/m3. The chlorophyll-a concentration in summer season was ~2.1, while that in winter season was ~1.1, times higher than that without atmospheric inorganic nitrogen compounds deposition, indicating that the atmospheric deposition of inorganic nitrogen compounds significantly influence surface chlorophyll-a concentration in summer season.

  • ―平成27年9月関東・東北豪雨を対象として―
    高橋 麗, 梶野 瑞王, 津口 裕茂, 林 修吾, 橋本 明弘
    2021 年 36 巻 1 号 p. 55-64
    発行日: 2021/03/20
    公開日: 2021/03/25
    ジャーナル フリー

    Aerosols can alter cloud microphysical and dynamical properties through complex aerosol-cloud-precipitation interaction processes. As aerosols increase, precipitation is suppressed and lifetime of cloud is extended (lifetime effect), whereas largely developed clouds are expected to develop more (invigoration). This aerosol to precipitation feedback process has been extensively studied, whereas not many have been done for heavy rainfall cases in Japan. The objective of the study is to evaluate the impacts of cloud condensation nuclei (CCN) changes on precipitation during the Kanto-Tohoku heavy rainfall by using numerical simulations and idealized sensitivity tests. Three CCN spectra (relationship between supersaturation and number of aerosols activated to form cloud droplets) were prepared for the tests, reflecting two orders of magnitude variations in CCN number concentrations. Both lifetime and invigoration effects were inferred for the light and heavy precipitation areas, respectively. Due to the invigoration, the one and two orders of magnitude increase in CCN numbers resulted in enhancement of heavy precipitations (both areas and amounts) by approximately 60–80% and 80–100%, respectively.

解説記事
feedback
Top