Can summer monsoon moisture invade the Jade Pass in Northwestern China?
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Can summer monsoon moisture invade the Jade Pass in Northwestern China? Wentao Du1 · Shichang Kang1,2,3 · Xiang Qin1 · Zhenming Ji4,5 · Weijun Sun6 · Jizu Chen1 · Junhua Yang1 · Deliang Chen7 Received: 8 November 2019 / Accepted: 18 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Heavy precipitation events are increasingly concerned because their significant contribution to annual precipitation in the Northwestern China, which might be related to invasion of summer monsoon moisture. It is interest whether or not the same is Jade Pass as being outside the control of the Asian summer monsoon. In this work, six heavy precipitation events were selected based on the 95 percentiles of the daily precipitation at the 12 weather stations around the Jade Pass from 1970–2000, with consideration of the influences of elevation. The event on June 19th, 2013 was chosen for a detailed examination due to the fact that the day has a large-scale precipitation as revealed by a gridded precipitation dataset over a large region. Using a Weather Research and Forecasting Model (WRF) simulation with high spatiotemporal resolution and in situ isotopic tracing (δ18O, δD), under a large-scale heavy precipitation event, this study provides ambitious view at the synoptic scale. A dramatic decrease in the δ18O, δD and deuterium (d)-excess of precipitation, very high relative humidity (98%), and reduced air temperature indicate that the precipitation was a result of long-distance-transported monsoon vapor. In addition, the slope of the local water meteoric line (LWML) of the precipitation for this event was very close to that of the global meteoric water line (GWML), indicating the source of moisture was from the ocean. Meanwhile, the WRF simulation confirms that the precipitation at the Jade Pass was not caused by local convection, but by summer monsoon. Both WRF simulation and isotopic tracing support the view that the monsoon moisture could invade Jade Pass at the synoptic scale and impact on precipitation, which need be further investigated. Keywords Extreme precipitation · Isotopic tracing (δ18O, δD) · WRF simulation · Monsoon moisture · Jade pass
1 Introduction Increasing extreme precipitation at the climate and synoptic scales has been demonstrated globally, especially in terms of frequency (the number of precipitation events in
a year) and intensity (the amount of precipitation at each event) (IPCC 2013; Ji et al. 2015; Trenberth et al. 2015). The dominant role of extreme precipitation at the synoptic scale has become increasingly significant to the annual precipitation amount, which not only induces disasters but also has 4
School of Atmospheric Sciences, Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275, China
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Qilian Shan Station of Glaciology and Eco‑Environment, State Key Laboratory of Cryospheric Science, Northwest Institute of Eco‑Environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou 730000, Ch
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