Deuterium excess in precipitation and water vapor origins over Japan: A review
Deuterium excess in precipitation and water vapor origins over Japan: A review
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DOI：
10.4145/jahs.46.101
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发表时间：
2016
影响因子：
1.5
通讯作者：
M. Tanoue;K. Ichiyanagi
中科院分区：
文献类型：
--
作者：
M. Tanoue;K. Ichiyanagi
水汽来源（即蒸发水分的来源）是根据降水中氘过量（=δD-8×δ18O，以下简称d-过量）估算的，主要由相对湿度、海面温度和水汽蒸发时的风速决定，并在大气水分输送过程中守恒。本综述总结了降水 d 过剩的观测研究以及日本上空水汽来源估算的数值研究。此外，本综述讨论了使用降水中的 d 过量作为大气水文循环示踪剂的潜力。结果表明，尽管冬季 d 过剩值高于 20% 或高于夏季，但除日本海一侧外，来自日本海的降水很可能不是该地区的主要降水。另一方面，降水中的高 d-excess 值似乎导致日本海蒸发的水蒸气对冬季降水的贡献较高。这些结果表明，降水中的 d 过剩在估算日本海水汽的贡献率方面具有潜在的应用价值。将这些关键发现与同位素测绘相结合可以为古气候研究和水资源管理提供有用的信息。
Water vapor origins(i.e., the sources of evaporated moisture)were estimated based on the deuterium excess(=δD-8×δ18O, hereafter d-excess)in precipitation, which was primarily determined by relative humidity, sea surface temperature, and wind speed as water vapor evaporates and is conserved during the atmospheric moisture transportation process. This review summarizes observation studies on d-excess in precipitation and numerical studies about estimation of water vapor origin over Japan. Moreover, this review discusses the potential for using d-excess in precipitation as a tracer of atmospheric hydrological cycles. The results revealed that precipitation originating from the Sea of Japan was most likely not predominant in the region, other than on the Sea of Japan side, despite the fact that d-excess values in winter were above 20‰ or higher than in summer. On the other hand, high d-excess values in precipitation appeared to lead to a high contribution of water vapor evaporated from the Sea of Japan to precipitation during winter. These results suggest that the d-excess in precipitation has potential applications in estimating the contribution ratio of water vapor originating from the Sea of Japan. Combining these key findings with isotope mapping can provide useful information for paleoclimate research and water resource management.