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Effect of enriched early dropped rainwater on mesoscale isotopic distribution in surface water on the Kii Peninsula, Japan
Author(s) -
Ishizuka Masahide,
Sone Yumi,
Ii Hiroyuki,
Hirata Tatemasa
Publication year - 2006
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2004wr003810
Subject(s) - rainwater harvesting , mesoscale meteorology , precipitation , peninsula , hydrology (agriculture) , geology , surface water , water mass , environmental science , atmospheric sciences , climatology , oceanography , meteorology , geography , ecology , geotechnical engineering , archaeology , environmental engineering , biology
Mesoscale spatial distributions and temporal variations of oxygen and hydrogen isotope compositions in surface waters were observed on the Kii Peninsula, Japan, which receives more than 3000 mm of precipitation annually. The enriched isotopic values were distributed along the western, southern, and eastern coasts. To explain this, we proposed a new parameter, early dropped rainwater frequency (ERF), and defined it as the number of times that early dropped rainwater was first observed in a domain. ERF can be considered a characteristic of rainfall, and it is a useful parameter for clarifying mesoscale isotopic distribution. A mass balance simulation suggested the early dropped rainwater determined the specific isotopic value of stream water in a watershed.