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[1]ZHANG Jiaqi,REN Zhiyuan.Analysis on Surface Humidity Index and Climatic Impacting Factors in Qaidam Basin[J].Research of Soil and Water Conservation,2015,22(01):133-139.

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Analysis on Surface Humidity Index and Climatic Impacting Factors in Qaidam Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 01 Page number: 133-139 Column: Public date: 2015-02-28

Title:: Analysis on Surface Humidity Index and Climatic Impacting Factors in Qaidam Basin

Author(s):: ZHANG Jiaqi, REN Zhiyuan; College of Tourism and Environmental Sciences, Shaanxi Normal University, Xi’an 710119, China

Keywords:: humidity index; EOF; partial correlation; Qaidam Basin

CLC:: P468

DOI:: -

Abstract:: In this paper, potential evaporation was calculated by using Penman-Monteith model, which generates the surface humidity index for the Qaidam Basin of each station.The characteristics of spatiotemporal variations of the humidity index were analyzed by using the Sen’s method, the Mann-Kendall test, Empirical Orthogonal Function (EOF) in Qaidam Basin during 34 years.Based on these, the climatic factors impacting the level of surface humidity were investigated by partial correlation methods.The results showed as follows: During the period of 34 years, the humidity index in Qaidam Basin presented an increasing trend with an interannual decrease rate of 0.000 97 a^-1, and the abrupt change happened in 1987.The spatial distribution showed a decreasing trend from east to west.The abnormal spatial pattern resides in two aspects: the difference of spatial in the east to the west, and the opposite changes in the south and the north, and the tendency of these two kinds of distribution presented an increasing trend.The humidity index had positive partial correlations with precipitation, relative humidity and sunshine duration, but negative partial correlations with average temperature and average wind speed.Precipitation and relative humidity were the main factors affecting the humidity index.

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