Verification of the isotopic composition of precipitation simulated by a regional isotope circulation model over Japan

The isotopic composition (δ 18 O and δ 2 H) of precipitation simulated by a regional isotope circulation model with a horizontal resolution of 10, 30 and 50 km was compared with observations at 56 sites over Japan in 2013. All simulations produced reasonable spatio-temporal variations in δ 18 O in p...

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Bibliographic Details
Published in:Isotopes in environmental and health studies 2016-07, Vol.52 (4-5), p.329-342
Main Authors: Tanoue, Masahiro, Ichiyanagi, Kimpei, Yoshimura, Kei
Format: Article
Language:English
Subjects:
Deuterium - analysis
Environmental Monitoring
Isotope circulation model
isotope hydrology
Japan
Models, Theoretical
Oxygen Isotopes - analysis
oxygen-18
precipitation
Rain - chemistry
Reproducibility of Results
Seasons
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Summary:The isotopic composition (δ 18 O and δ 2 H) of precipitation simulated by a regional isotope circulation model with a horizontal resolution of 10, 30 and 50 km was compared with observations at 56 sites over Japan in 2013. All simulations produced reasonable spatio-temporal variations in δ 18 O in precipitation over Japan, except in January. In January, simulated δ 18 O values in precipitation were higher than observed values on the Pacific side of Japan, especially during an explosively developing extratropical cyclone event. This caused a parameterisation of precipitation formulation about the large fraction of precipitated water to liquid detrained water in the lower troposphere. As a result, most water vapour that transported from the Sea of Japan precipitated on the Sea of Japan side. The isotopic composition of precipitation was a useful verification tool for the parameterisation of precipitation formulation as well as large-scale moisture transport processes in the regional isotope circulation model.
ISSN:1025-6016
1477-2639
DOI:10.1080/10256016.2016.1148695