How reliable are modeled precipitation isoscapes over a high-relief mountainous region?
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- Yamanaka Tsutomu
- Faculty of Life and Environmental Sciences, University of Tsukuba
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- Makino Yuki
- Graduate School of Life and Environmental Sciences, University of Tsukuba
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- Wakiyama Yoshifumi
- Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba
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- Kishi Kazuhiro
- Faculty of Life and Environmental Sciences, University of Tsukuba
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- Maruyama Kosuke
- Yamanashi Prefectural Office
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- Kano Masaya
- Graduate School of Life and Environmental Sciences, University of Tsukuba
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- Ma Wenchao
- Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba
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- 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
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- Hydrological Research Letters
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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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詳細情報
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- CRID
- 1390001205289890944
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- NII論文ID
- 130005130496
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- ISSN
- 18823416
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可