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Advances in Meteorology Volume 2018 ,2018-11-22
Climate Changes and Associated Multiscale Impacts on Watershed Discharge over the Upper Reach of Yarlung Zangbo River Basin, China
Research Article
Jinping Liu 1 , 2 Wanchang Zhang 1
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DOI:10.1155/2018/4851645
Received 2018-08-22, accepted for publication 2018-10-15, Published 2018-10-15
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摘要

Watershed discharge (WD) in the alpine regions, such as the upper reach of Yarlung Zangbo River Basin (YZRB), China, could have changed severely in response to climate changes. Yet, how hydrometeorological variables varied at different time scales and how WD varied in response to hydrometeorological variables in the alpine regions remained questions to be answered. The ensemble empirical mode decomposition (EEMD) method was employed in this study to investigate the nonlinear climate change trends (averaged and extreme states) and the associated multiscale impacts on WD variations over the upper reach of the YZRB during 1961–2009. All investigated hydroclimatic variables, i.e., precipitation, temperature, and WD, were found to be varied nonlinearly with clear multiscale oscillations characterizing great differences in the oscillation periods, corresponding significance levels, and variance contribution rates, among which precipitation posed a weak impact on WD variations, while temperature played a significant role in WD fluctuations. Furthermore, among all temperature extremes, the dominant index affecting WD variations was TXm (annual mean of the daily maximum temperature) but not TXx (annual maximum of the daily maximum temperature) at both interannual and interdecadal scales, which might be caused by that TXx increased evapotranspiration and reduced WD. A significant correlation between temperature (both averaged and partial extreme states) and annual WD at both interannual and interdecadal scales indicated that a synchronous change existed between them. The present study provided first insight into how hydrometeorological variables varied at different time scales and how WD fluctuated in response to hydrometeorological variables over the upper reach of the YZRB, China.

授权许可

Copyright © 2018 Jinping Liu and Wanchang Zhang. 2018
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.

图表

Topography of the study area and geographical location of the national hydrological station of Lazi.

Pavg (a) and Tavg (b) anomaly series with their 5-year moving average during 1961–2009 over the upper reach of the YZRB.

Pavg (a) and Tavg (b) anomaly series with their 5-year moving average during 1961–2009 over the upper reach of the YZRB.

Significance test for the IMFs of Pavg (a) and Tavg (b) anomaly during 1961–2009 over the upper reach of the YZRB.

Significance test for the IMFs of Pavg (a) and Tavg (b) anomaly during 1961–2009 over the upper reach of the YZRB.

Interannual and interdecadal fluctuations as well as nonlinear change trends of Pavg anomaly series (a) and Tavg anomaly series (b) during 1961–2009 over the upper reach of the YZRB.

Interannual and interdecadal fluctuations as well as nonlinear change trends of Pavg anomaly series (a) and Tavg anomaly series (b) during 1961–2009 over the upper reach of the YZRB.

A significance test for the IMFs (IMF1–IMF4) of WD anomaly during the period 1961–2009 in the upper reach of the YZRB.

Interannual and interdecadal fluctuations as well as a nonlinear change trend of WD anomaly series during the period 1961–2009 over the upper reach of the YZRB.

通讯作者

Wanchang Zhang.Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China, cas.cn.zhangwc@radi.ac.cn

推荐引用方式

Jinping Liu,Wanchang Zhang. Climate Changes and Associated Multiscale Impacts on Watershed Discharge over the Upper Reach of Yarlung Zangbo River Basin, China. Advances in Meteorology ,Vol.2018(2018)

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