CR 49:29-44 (2011)  -  DOI:

Precipitation isotope characteristics and climatic controls at a continental and an island site in ­Northeast Asia

Jianrong Liu1,2, Xianfang Song1,*, Guobin Fu3, Xin Liu1,2, Yinghua Zhang1, Dongmei Han1

1Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Chaoyang District, Beijing, 100101, PR China
2Graduate University of Chinese Academy of Sciences, 19A Yu Quan Road, Beijing, 100049, PR China
3CSIRO Land and Water, Private Bag 5, Wembley, Western Australia 6913, Australia

ABSTRACT: In mid-latitude continental and island regions, the isotope composition of air masses often varies according to both their origin and their interaction with topography along their path of travel. Comparison of stable isotopes in continental and island precipitation events can reveal climatic controls upon isotopic content and yield information about patterns of atmo­spheric circulation. The overall deuterium (D) and oxygen-18 (18O) characteristics of 64 precipitation events observed in continental Beijing, China, and 109 precipitation events observed at Seongsan (Jeju Island, Republic of Korea) were investigated. The established local meteoric water lines, δD = 7.49δ18O + 1.53 (R2 = 0.96, n = 64) and δD = 8.36δ18O + 19.05 (R2 = 0.86, n = 109), indicated periodic drought in Beijing and a kinetic effect in the condensation process in Seongsan. To trace moisture origins and transport paths for all precipitation events, the 96 h backward trajectories of air masses arriving at 3000 m above ground level were calculated and categorized using the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model. The results indicate that during the Asian monsoon period, the air mass categories represented at Seongsan were principally from the southeast, southwest, and continental vicinity (CV). Those observed for Beijing were more varied (northwest, west, north, marine vicinity, south, and CV). Additionally, the meteorological controlling factors of each air mass category were ­identified using non-linear stepwise regression. The precipitation amount was the main predictor for 18O in precipitation in Seongsan, while the controlling factors involved in Beijing were more complicated.

KEY WORDS: δ18O · δD · Event precipitation · Meteorological conditions · Backward trajectory · HYSPLIT

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Cite this article as: Liu J, Song X, Fu G, Liu X, Zhang Y, Han D (2011) Precipitation isotope characteristics and climatic controls at a continental and an island site in ­Northeast Asia. Clim Res 49:29-44.

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