Preprints
https://doi.org/10.5194/hess-2019-626
https://doi.org/10.5194/hess-2019-626

  12 Dec 2019

12 Dec 2019

Review status: this preprint was under review for the journal HESS but the revision was not accepted.

Annual variation characteristics of Eurasian hydrologic elements and their linkage with climate and environment changes during 1951–2015

Jia Qin1, Yongjian Ding2,3, Tianding Han2, Junhao Li1, Shaoping Wang2, and Yaping Chang1 Jia Qin et al.
  • 1Key Laboratory of Eco-hydrology Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China
  • 2State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China
  • 3University of Chinese Academy of Sciences, Beijing, 100049, China

Abstract. In this paper, the variations of the lowest monthly discharge (LD), mean monthly discharge (MD), and highest monthly discharge value (HD) during 1951–2015, as well as spring snowmelt water and winter river ice change, in eleven major rivers, distributed respectively in the high-latitudes (55° N–70° N), middle latitudes (40° N–55° N), and lower latitudes (30° N–40° N) of Eurasia, were analysed. Energy and water budgets in different watersheds were compared to detect the reasons for Eurasian hydrological changes. We found that the annual LD in most Eurasian rivers was increasing since the 1950s, with rates of (5 %–8 %) per decade. But the increase rate slowed down after the late 1990s in the middle latitudes of Eurasia. Both the MD and HD in the lower latitudes of Eurasia had increasing trends during 1951–2015, while they had little changes in the high and middle latitudes. The river ice thickness and volume have been continuously reducing since the 1950s, as well as the maximum snow water equivalent. And ice period of the Eurasian rivers has shortened about 24 days. The LD trend is mostly dominated by temperature via impacting river ice thickness and extent, while the HD is mostly impacted by snowmelt water and rainfall respectively in different latitudes. Annual MD trend is controlled by evapotranspiration, especially after the late 1990s. After the late 1990s, a warm Arctic-large discharge pattern existed in the lower and high latitudes of Eurasia, but a warm Arctic- few discharge pattern in the middle latitudes (except the winter).

Jia Qin et al.

 
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Jia Qin et al.

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Short summary
Based on the spatial-temporal variations of runoff, river ice, snowmelt and water-energy budgets, as well as Arctic index, we found that the lowest, mean, and highest monthly discharge of Eurasian rivers had large zonal differences and different trends during 1951–2015, especially after the late 1990s. River-ice is a dominate factor in winter runoff variation. A warm Arctic-large discharge and a warm Arctic- few discharge pattern exist in different latitudes of Eurasia after the late 1990s.