Identification of trends in long term time series of hydro-meteorological variables is an important topic for better understanding the effects of climate change and human activity on hydrological processes. In this study, data from five meteorological variables at eight stations in the upper and middle reaches of Heihe River Basin were analysed and the non-parametric Mann-Kendall test was employed to investigate their trends over the past years. It was found that on the annual scale, time series of average temperature, daily maximum and daily minimum temperatures at all selected stations presented remarkable increasing trends at the significance level of 0.01 (or 0.05, 0.001). Only annual precipitation time series at Tuole station showed a remarkable increasing trend at the 0.1 significance level and only sunshine hour time series at Shandan station showed a decreasing trend at the 0.05 significance level. All these trends were correlated with factors such as global especially regional climatic change, weather systems at different spatial scales, local environment and human activities.
LI Zhan-ling, WANG Xiao-juan
. Shift trend analysis of meteorological time series in the upper and middle reaches of Heihe River Basin[J]. GEOGRAPHICAL RESEARCH, 2011
, 30(11)
: 2059
-2066
.
DOI: 10.11821/yj2011110012
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