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[B-4.3.3 Water Circulation Study by the ¹⁸O Measurement in Precipitating Water]

[Contact Person]

Gen Inoue
Principal Research Scientist
Atmospheric Division and Global Environment Division,
National Institute for Environmental Studies, Environment Agency Japan
16-2 Onogawa, Tsukuba, Ibaraki 305, JAPAN
Phone +81-298-50-2402, Fax +81-298-50-2468
e-mail inouegen@nies.go.jp

[Total Budget for FY1995-1996]

9,567,000 Yen (FY1995 4,915,000 Yen)

[Abstract]

　The tenestrial water cycle study plays an important role in the climate reteach not only it is the energy transportation process but also the influence to the vegetation. The stable isotope of water, H₂¹⁸O, is one of the key elements to understand the water cycle processes. It is influenced by the evaporation/condensation and the transportation.
　In this program, the precipitation sampling network was formed over European Russia and Siberia, 13 stations, as a two years project from 1996-1997. The samples are being collected but the analysis is not made by this time.
　For the in situ measurement of water vapor, surface or underground water, and the water in trees, a new method was searched; Laser photo-acoustic determination of H₂¹⁸O/H₂¹⁶O ratio was examined.

[Key Words]

Hydrology, Water cycle Greenhouse gases, Siberia