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Water 2018, 10(1), 35; https://doi.org/10.3390/w10010035

Spatiotemporal Characteristics of Extreme Precipitation Regimes in the Eastern Inland River Basin of Inner Mongolian Plateau, China

1
College of Water Conservancy and Civil Engineering/Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Inner Mongolia Agricultural University, Hohhot 010018, China
2
Institute for Applied Systems Technologies, Fraunhofer IOSB-AST, 98693 Ilmenau, Germany
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 22 November 2017 / Revised: 27 December 2017 / Accepted: 1 January 2018 / Published: 3 January 2018
(This article belongs to the Special Issue Impact of Climate on Hydrological Extremes)
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Abstract

In this work, we use the gridded precipitation dataset (with a resolution of 0.5° × 0.5°) of the eastern part of inland river basin of Inner Mongolian Plateau from 1961–2015 as the basis and adopt the methods of climatic diagnosis (e.g., the Modified Mann-Kendall method, principal component analysis, and correlation analysis) to analyze the spatial and temporal variations of six extreme precipitation indices. Furthermore, we analyzed the relationship between El Niño–Southern Oscillation (ENSO) events and the observed extreme precipitation. The results indicated that the gridded dataset can be used to describe the precipitation distribution in our study area. In recent 55 years, the inter-annual variation trends of extreme precipitation indices are generally dominated by declination except for the maximum precipitation over five days (RX5DAY) and the heavy precipitation (R95P), in particular, the decreasing regions of consecutive dry days (CDD) accounts for 91% of the entire basin, 17.28% of which is showing the significant downward trend. Contrary to CDD, the spatial distribution of the other five indices is gradually decreasing from northeast to southwest, and the precipitation intensity (SDII) ranges from 3.8–5.3 mm·d−1, with relatively small spatial differences. To some extent, CDD and R95P can used to characterize the extreme precipitation regimes. Moreover, the number of days with heavy precipitation (RR10), SDII, and R95P are more susceptible to the ENSO events. In addition, the moderate El Niño event may increase the probability of CDD, while the La Niña events may increase the risk of the heavy rainfall regime in the study area. View Full-Text
Keywords: inland river basin; extreme precipitation; spatiotemporal variation; Modified Mann-Kendall; ENSO events inland river basin; extreme precipitation; spatiotemporal variation; Modified Mann-Kendall; ENSO events
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, W.; Duan, L.; Luo, Y.; Liu, T.; Scharaw, B. Spatiotemporal Characteristics of Extreme Precipitation Regimes in the Eastern Inland River Basin of Inner Mongolian Plateau, China. Water 2018, 10, 35.

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