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首页> 外文期刊>Journal of hydrometeorology >The Isotopic Composition of Rainfall on a Subtropical Mountainous Island
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The Isotopic Composition of Rainfall on a Subtropical Mountainous Island

机译：The Isotopic Composition of Rainfall on a Subtropical Mountainous Island

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Tropical islands are simultaneously some of the most biodiverse and vulnerable places on Earth. Water re-sources help maintain the delicate balance on which the ecosystems and the population of tropical islands rely. Hydrogen and oxygen isotope analyses are a powerful tool in the study of the water cycle on tropical islands, although the scarcity of long-term and high-frequency data makes interpretation challenging. Here, a new dataset is presented based on weekly col-lection of rainfall H and O isotopic composition on the island of O'ahu, Hawai'i, beginning from July 2019 and still ongoing. The data show considerable differences in isotopic ratios produced by different weather systems, with Kona lows and upper-level lows having the lowest 82H and 818O values, and trade-wind showers the highest. The data also show significant spatial variability, with some sites being characterized by higher isotope ratios than others. The amount effect is not observed consis-tently at all sites. Deuterium excess shows a marked seasonal cycle, which is attributed to the different origin and history of the air masses that are responsible for rainfall in the winter and summer months. The local meteoric water line and a compar-ison of this dataset with a long-term historical record illustrate strong interannual variability and the need to establish a long-term precipitation isotope monitoring network for Hawai'i.SIGNIFICANCE STATEMENT: The isotopic composition of water is often used in the study of island water resour-ces, but the scarcity of high-frequency datasets makes the interpretation of data difficult. The purpose of this study is to investigate the isotopic composition of rainfall on a mountainous island in the subtropics. Based on weekly data collec-tion on O'ahu, Hawai'i, the results improve our understanding of the isotopic composition of rainfall due to different weather systems, like trade-wind showers or cold fronts, as well as its spatial and temporal variability. These results could inform the interpretation of data from other mountainous islands in similar climate zones.

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