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| Titel |
Spatial distribution of oxygen-18 and deuterium in stream waters across the Japanese archipelago |
| VerfasserIn |
M. Katsuyama, T. Yoshioka, E. Konohira |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 3 ; Nr. 19, no. 3 (2015-03-31), S.1577-1588 |
| Datensatznummer |
250120671
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| Publikation (Nr.) |
 copernicus.org/hess-19-1577-2015.pdf |
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| Zusammenfassung |
| The spatial distribution of oxygen and hydrogen isotopic composition
(δ18O and δ2H) of stream waters across Japan was
clarified with a data set by compiling sample data obtained from 1278 forest
catchments during the summer of 2003. Both δ18O and δ2H
values showed positive correlations with the mean annual air
temperature and annual evapotranspiration, and negative correlations with
latitude and elevation. Deuterium excess (d-excess) values in stream waters
were higher on the Sea of Japan side, and lower on the Pacific Ocean side,
of the Japanese archipelago. The d-excess in precipitation was generally
higher in winter and lower in summer in Japan. The Sea of Japan side
experiences a great deal of snowfall, and seasonal changes in monthly
precipitation are rather small. In contrast, the Pacific Ocean side
experiences a large amount of rainfall during summer with low levels of
precipitation during the winter. Therefore, the lower d-excess in stream
waters on the Pacific Ocean side reflects summer precipitation, and the
higher values on the Sea of Japan side are affected by delayed recharge from
snowmelt. The isoscapes of stream water connote not only spatially
integrated but also temporally integrated isotope signals of precipitation
and provide a framework for addressing applied hydrological, ecological, or
meteorological research questions at regional scales, such as the effects of
climate change. |
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