How reliable are modeled precipitation isoscapes over a high-relief mountainous region?

  • Yamanaka Tsutomu
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • Makino Yuki
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • Wakiyama Yoshifumi
    Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba
  • Kishi Kazuhiro
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • Maruyama Kosuke
    Yamanashi Prefectural Office
  • Kano Masaya
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • Ma Wenchao
    Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba
  • Suzuki Keisuke
    Faculty of Science, Shinshu University

抄録

Precipitation isotope maps over mountains are critical for water resource assessment, yet isoscape modeling has been minimally investigated for complex terrain with high relief. Here we show that multiannual (2011–2015) mean precipitation isoscapes across the Japanese Alps region can be represented by simple multiple-regression models with strong goodness of fit (R2 = 0.928 for δ2H and 0.944 for δ18O). Reliability of the models was further confirmed by agreement with previously reported independent data throughout a wider range of elevation (7–3,730 m asl). Modeled precipitation isoscapes were consistent with observations of soil water (20 sites) and river water (50 sites) when considering evaporative enrichment and unclosed water balance. Uncertainties of modeled δ values for precipitation were greater in lowlands near the coast than over the mountains. Unexpectedly, spatially uniform isotopic lapse rates (–11.66‰ km–1 for δ2H and –1.724‰ km–1 for δ18O), which are divorced from continental effects, gave substantially good approximation on a regional (e.g., a few hundred kilometers) scale. This allows for convenient and reliable modeling of precipitation isoscapes over mountainous regions for hydrological/ecological/interdisciplinary applications.

収録刊行物

  • Hydrological Research Letters

    Hydrological Research Letters 9 (4), 118-124, 2015

    水文・水資源学会/日本地下水学会/日本水文科学会/陸水物理研究会

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