https://scholars.lib.ntu.edu.tw/handle/123456789/414297
標題: | Stable isotope ratios of typhoon rains in Fuzhou, Southeast China, during 2013–2017 | 作者: | Tao Xu Xiaoshuang Sun Hui Hong Xiaoyan Wang Mengyue Cui Guoliang Lei Lu Gao Juan Liu Mahjoor Ahmad Lone 隆馬吉 Mahjoor Ahmad Lone |
關鍵字: | Typhoon; Rainfall; Stable Isotope ratios; Southeast China; Rain shield effect | 公開日期: | 2019 | 出版社: | Elsevier {BV} | 卷: | 570 | 起(迄)頁: | 445 | 來源出版物: | Journal of Hydrology | 摘要: | © 2019 Elsevier B.V. Stable isotope ratios (δ 2 H and δ 18 O) in precipitation not only show a certain response to climate change at different time scales, but also have strong linkages to extreme weather events such as tropical cyclones (hurricanes/typhoons). Typhoon activity in the coastal region of Southeast China is quite intense, bringing huge amounts of moisture; thus, contributing to extreme rainfall in this region. The existing isotope data in Southeast China is available on a monthly or daily temporal resolution, which is inadequate to study 1–2-day-long typhoon rainfall events at a particular location. In this study, hourly rainfall δ 2 H and δ 18 O data are collected for eight typhoon events from 2013 to 2017 in Fuzhou, Southeast China. The total correlation between δ 2 H and δ 18 O is obtained as δ 2 H = 7.41 δ 18 O + 0.81 (R 2 = 0.96, N = 220). All the eight typhoon events reveal a similar variability pattern in δ 18 O values which can be divided into three stages. More positive δ 18 O values occur in the first and third stages, while the second stage is dominated by most negative δ 18 O values, exhibiting an inverted U-shaped pattern. The positive δ 18 O values during the first and third stages are governed by re-evaporation. The precipitation during the second stage has distinctly lower δ 18 O values than the weighted average δ 18 O of summer precipitation in Fuzhou. Some of these values are slightly lower than those of the water vapor over the Pacific Ocean's surface. No significant relationship is observed between precipitation δ 18 O and temperature as well as the amount of precipitation during the second stage. We hypothesize that the significant 18 O-depletion is mainly caused by the ‘rain shield effect’ which refers to combination of large-scale convection, high condensation efficiency, and recycling of isotopically depleted vapor in rain shield areas leading to very negative δ 18 O values during typhoon system. These findings suggest the use of stable isotope ratios as important tracers of typhoon water. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/414297 | ISSN: | 0022-1694 | DOI: | 10.1016/j.jhydrol.2019.01.017 https://doi.org/10.1016%2Fj.jhydrol.2019.01.017 52933618 |
SDG/關鍵字: | Climate change; Isotopes; Rain; Storms; Condensation efficiency; Different time scale; Extreme weather events; Hurricanes/typhoons; Southeast China; Stable isotope ratios; Summer precipitation; Variability patterns; Hurricanes; climate change; isotopic ratio; oxygen isotope; precipitation (climatology); rainfall; stable isotope; tropical cyclone; typhoon; United Nations Framework Convention on Climate Change; China; Fujian; Fuzhou; Pacific Ocean |
顯示於: | 地質科學系 |
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