Stable isotopic characteristics of precipitation related to the environmental controlling factors in Ningbo, East China
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RESEARCH ARTICLE
Stable isotopic characteristics of precipitation related to the environmental controlling factors in Ningbo, East China Yasheng Shi 1 & Zanfang Jin 1
&
Aijing Wu 1 & Guangyao Li 1 & Feili Li 1
Received: 6 August 2020 / Accepted: 20 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Hydrogen and oxygen stable isotopes (δ2H and δ18O) in precipitation were analysed from June 2018 to May 2020 in Ningbo and were influenced by the subtropical monsoon climate in East China. The δ2H and δ18O values of precipitation in Ningbo varied from −90.0 to 6.0‰ and from −13.5 to −1.6‰, respectively. The local meteoric water line (LMWL) in Ningbo was obtained as δ2H = 9.27 δ18O + 35.95 and had a larger slope and intercept compared to the global meteoric water line (GMWL) because its water vapour sources were oceans. The more negative δ18O values and lower deuterium excess (D-excess) of precipitation in summer were due to water vapour sources from the East China Sea, the South Sea and the Western Pacific, which are controlled by the southeasterly monsoon. In contrast, the less negative δ18O and higher D-excess of precipitation in winter were influenced by water vapour sources from the North Asian continent and North China transported by the northwesterly monsoon. The precipitation amount effect was significant in Ningbo, especially in summer. The inverse temperature effect was appeared in Ningbo, except winter. These two effects may be caused mainly by the monsoon climate rather than by the secondary evaporation effect. Keywords Hydrogen isotopes . Oxygen isotopes . HYSPLIT model . Precipitation amount effect . Temperature effect
Introduction Precipitation is a vital step in the natural water cycle. The composition of atmospheric precipitation is useful for understanding the numerous hydrogeological, climatological and Highlights • The LMWL in Ningbo has a larger slope and intercept than that in GMWL. • The HYSPLIT model was used to simulate water vapour sources. • Seasonal variations of D-excess provide a large amount of details for changes in water vapour sources. • The precipitation amount effect and inverse temperature effect were observed. Responsible Editor: Marcus Schulz Supplementary Information The online version contains supplementary material available at https://doi.org/10.1007/s11356-02011332-8. * Zanfang Jin [email protected] 1
College of Environment, Zhejiang University of Technology, Hangzhou 310032, China
ecological processes, ranging from global to local scales (Chen et al. 2017; Dublyansky et al. 2018; Li et al. 2016; Wang et al. 2016). In particular, hydrogen and oxygen stable isotopes (δ2H and δ18O) can be used as tracers of precipitation and can provide information about water vapour sources, transport pathways, atmospheric air masses and groundwater recharge mechanisms; they can also help to study the global and local water cycle (Bagher et al. 2019; Bu et al. 2018; Heydarizad et al. 2019; Kostrova et al. 2020; Mohammadzadeh et al. 2020; Rao et al. 201
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