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Controls on daily to interannual variations of summer precipitation isotopic signatures from Qinghai Lake watershed, northeastern Tibetan Plateau by Jing Li; Lihui Tian; Xiong Xiao; Cicheng Zhang is a Environmental Science article available to read on EtoBox.

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Numerous crucial paleoclimate records in monsoon regions depend on past precipitation isotopes as proxies for hydroclimate; however, the relationship between climatic variability and precipitation isotopes remains poorly understood. In this study, we investigated key climatic drivers from local to regional scales using 7-year-long daily summer precipitation isotopes in the Qinghai Lake watershed of the northeast Tibetan Plateau, located in the margin of summer monsoon extent. Results showed that daily precipitation δ 18 O and δ 2 H exhibited intra-seasonal fluctuation from 2012 to 2018 characterized by low isotopic values in July (e.g., δ 18 O = − 10‰) and high values in June (e.g., δ 18 O = − 6.7‰). Moisture source analysis via Hybrid Sing-Particle Lagrangian Trajectory indicated that the primary moisture of Qinghai Lake was mainly derived from northwestern inland regions, North China, and South China across seasons with high specific humidity and trajectory frequency, having a great influence on the isotopic patterns in precipitation across seasons. Moreover, convective activities in the primary moisture source regions, shown by outgoing longwave radiation and specific humidity a

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Author

Jing Li; Lihui Tian; Xiong Xiao; Cicheng Zhang

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)