Deciphering key processes controlling rainfall isotopic variability during extreme tropical cyclones
Deciphering key processes controlling rainfall isotopic variability during extreme tropical cyclones
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DOI：
10.1038/s41467-019-12062-3
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发表时间：
2019-09
影响因子：
16.6
通讯作者：
R. Sánchez‐Murillo;A. Durán‐Quesada;G. Esquivel‐Hernández;Daniela Rojas-Cantillano;C. Birkel;K. Welsh;M. Sánchez-Llull;C. Alonso-Hernández;D. Tetzlaff;C. Soulsby;J. Boll;N. Kurita;K. Cobb
中科院分区：
文献类型：
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作者：
R. Sánchez‐Murillo;A. Durán‐Quesada;G. Esquivel‐Hernández;Daniela Rojas-Cantillano;C. Birkel;K. Welsh;M. Sánchez-Llull;C. Alonso-Hernández;D. Tetzlaff;C. Soulsby;J. Boll;N. Kurita;K. Cobb
中美洲和加勒比地区的特点是热带气旋、强烈的厄尔尼诺-南方涛动事件和气候多变性，给社会生态系统带来独特的危害。在这里，我们报告了MAC地区TC（飓风奥托，2016）同位素演变的第一个特征。我们使用来自哥斯达黎加的长期日降雨同位素和飓风Irma和Maria（2017年）的基于事件的采样，以支持TC同位素比率的动态驱动因素。在飓风奥托期间，降雨的同位素范围很大，与年度同位素循环相当。随着飓风奥托组织成3级飓风，快速的同位素耗尽加上ind-excess的减少表明在温暖核心西南约200公里范围内有有效的同位素分馏。我们的研究结果揭示了在大陆和海洋TC轨道的MAC区域降雨同位素比值的关键过程，并应用于整个热带地区的古水文气候的解释。
The Mesoamerican and Caribbean (MAC) region is characterized by tropical cyclones (TCs), strong El Niño-Southern Oscillation events, and climate variability that bring unique hazards to socio-ecological systems. Here we report the first characterization of the isotopic evolution of a TC (Hurricane Otto, 2016) in the MAC region. We use long-term daily rainfall isotopes from Costa Rica and event-based sampling of Hurricanes Irma and Maria (2017), to underpin the dynamical drivers of TC isotope ratios. During Hurricane Otto, rainfall exhibited a large isotopic range, comparable to the annual isotopic cycle. As Hurricane Otto organized into a Category 3, rapid isotopic depletion coupled with a decrease ind-excess indicates efficient isotopic fractionation within ~200 km SW of the warm core. Our results shed light on key processes governing rainfall isotope ratios in the MAC region during continental and maritime TC tracks, with applications to the interpretation of paleo-hydroclimate across the tropics.