Spatial distribution of oxygen-18 and deuterium in stream waters across the Japanese archipelago
Spatial distribution of oxygen-18 and deuterium in stream waters across the Japanese archipelago
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DOI：
10.5194/hess-19-1577-2015
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发表时间：
2014-09
影响因子：
6.3
通讯作者：
M. Katsuyama;T. Yoshioka;E. Konohira
中科院分区：
文献类型：
--
作者：
M. Katsuyama;T. Yoshioka;E. Konohira
通过对 2003 年夏季 1278 个森林流域的样本数据进行整理，得到了日本全国溪流氧和氢同位素组成（ 18 O 和 2 H）的空间分布。 18 O 和 2 H 值均与年平均气温和年蒸散量呈正相关，与纬度和海拔呈负相关。日本列岛的溪流水中的氘过剩（d-excess）值在日本海一侧较高，在太平洋一侧较低。日本降水量d-剩余总体上冬季较高，夏季较低。日本海一侧降雪量较大，月降水量季节变化较小。相比之下，太平洋一侧夏季降水较多，冬季降水较少。因此，太平洋一侧溪流中较低的d-excess反映了夏季降水，而日本海一侧较高的值则受到融雪补给延迟的影响。溪流水的等景观不仅意味着降水的空间整合，而且还意味着时间整合的同位素信号，并为解决区域尺度的应用水文、生态或气象研究问题（例如气候变化的影响）提供了框架。
The spatial distribution of oxygen and hydrogen isotopic composition ( 18 O and 2 H) 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 18 O and 2 H values showed positive correla- tions with the mean annual air temperature and annual evap- otranspiration, and negative correlations with latitude and el- evation. Deuterium excess (d-excess) values in stream waters were higher on the Sea of Japan side, and lower on the Pa- cific 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 precipita- tion are rather small. In contrast, the Pacific Ocean side ex- periences 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 in- tegrated but also temporally integrated isotope signals of pre- cipitation and provide a framework for addressing applied hydrological, ecological, or meteorological research ques- tions at regional scales, such as the effects of climate change.