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Hydroclimatic controls on the isotopic (δ18O, δ2H, d-excess) traits of pan-Arctic summer rainfall events.
Frontiers in Earth Science ( IF 2.9 ) Pub Date : 2021-04-27 , DOI: 10.3389/feart.2021.651731
Moein Mellat , Hannah Bailey , Kaisa-Riikka Mustonen , Hannu Marttila , Eric S. Klein , Konstantin Gribanov , M. Syndonia Bret-Harte , Artem V. Chupakov , Dmitry V. Divine , Brent Else , Ilya Filippov , Valtteri Hyöky , Samantha Jones , Sergey N. Kirpotin , Aart Kroon , Helge Tore Markussen , Martin Nielsen , Maia Olsen , Riku Paavola , Oleg S. Pokrovsky , Anatoly Prokushkin , Morten Rasch , Katrine Raundrup , Otso Suominen , Ilkka Syvänperä , Sölvi Rúnar Vignisson , Evgeny Zarov , Jeffrey M. Welker

Arctic sea-ice loss is emblematic of an amplified Arctic water cycle and has critical feedback implications for global climate. Stable isotopes (δ18O, δ2H, d-excess) are valuable tracers for constraining water cycle and climate processes through space and time. Yet, the paucity of well-resolved Arctic isotope data preclude an empirically derived understanding of the hydrologic changes occurring today, in the deep (geologic) past, and in the future. To address this knowledge gap, the Pan-Arctic Precipitation Isotope Network (PAPIN) was established in 2018 to coordinate precipitation sampling at 19 stations across key tundra, subarctic, maritime, and continental climate zones. Here, we present a first assessment of rainfall samples collected in summer 2018 (n=281) and combine new isotope and meteorological data with sea ice observations, reanalysis data, and model simulations. Data collectively establish a summer Arctic Meteoric Water Line where δ2H = 7.6∙δ18O–1.8 (r2=0.96, p0.75 ‰/°C) were observed at continental sites, while statistically significant temperature relations were generally absent at coastal stations. Model outputs indicate that 68% of the summer precipitating air masses were transported into the Arctic from mid-latitudes and were characterized by relatively high δ18O values. Yet 32% of precipitation events, characterized by lower δ18O and high d-excess values, derived from northerly air masses transported from the Arctic Ocean and/or its marginal seas, highlighting key emergent oceanic moisture sources as sea ice cover declines. Resolving these processes across broader spatial-temporal scales is an ongoing research priority, and will be key to quantifying the past, present, and future feedbacks of an amplified Arctic water cycle on the global climate system.

中文翻译:

北极夏季降雨事件的同位素(δ18O,δ2H,d-过量)特征的水文气候控制。

北极海冰的丧失是北极水循环放大的象征,对全球气候具有至关重要的反馈意义。稳定的同位素(δ18O,δ2H,d-过量)是宝贵的示踪剂,可用于通过空间和时间限制水循环和气候过程。但是,由于缺乏良好解析的北极同位素数据,因此无法凭经验得出对当前,过去(地质)过去和未来发生的水文变化的理解。为了解决这一知识鸿沟,于2018年建立了泛北极降水同位素网络(PAPIN),以协调跨主要苔原,亚北极,海洋和大陆性气候区的19个站点的降水采样。在这里,我们将对2018年夏季(n = 281)收集的降雨样本进行首次评估,并将新的同位素和气象数据与海冰观测资料相结合,重新分析数据和模型仿真。数据共同建立了夏季北极气象水线,在大陆站点观测到δ2H= 7.6∙δ18O–1.8(r2 = 0.96,p0.75‰/°C),而沿海站点通常没有统计上显着的温度关系。模型输出表明,有68%的夏季降水气团是从中纬度输送到北极的,其特征是较高的δ18O值。然而,来自北冰洋和/或其边缘海的北气团产生的降水事件中,δ18O较低,d过量值较高,占32%,这突显了随着海冰覆盖率下降,主要的新兴海洋水分来源。在更广泛的时空尺度上解决这些过程是一项持续的研究重点,并且对于量化过去是至关重要的,
更新日期:2021-04-28
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