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Classification-Based Spatiotemporal Variations of Pan Evaporation Across the Guangdong Province, South China

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Abstract

Change in pan evaporation (Epan) has evoked general scientific interest because it involves both climatic and hydrological effects. The enhanced greenhouse effect may be the casual factor, although the mechanism still needs to be further confirmed. Based on meteorological data (Pan evaporation, rainfall, air temperature, sunshine duration, relative humidity, wind speed, cloud cover, and water vapor pressure) of 85 sites from 1957 to 2006, classification-based spatiotemporal variations of pan evaporation and possible causes were studied in the Guangdong province, South China (with a coastline of 8,500 km), which is one of China’s most prosperous provinces with the largest population. The Guangdong province was spatially divided into 4 parts, i.e., Southwest part, East part, Central part, and Northwest part, according to Epan and seven other climatic factors based on cluster analysis. Results showed that pan evaporation in this study area declined −3.35 mm year−1 on average in time, and mainly decreased from the seashore area to the inland area in space. Results also showed that all the climatic factors can contribute to change in Epan, but their contributions were different over the space. Sunshine duration (SD) and wind speed (WS) had a positive correlation with Epan, while rainfall (R) and air temperature (Ta) were negatively correlated to Epan. Among all the 7 climatic factors, SD was identified as the dominant driving force of Epan change in the Guangdong province.

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Acknowledgments

The research is financially supported by the National Natural Science Foundation of China (Grant No. 51379223 and 51210013), and the Pearl-River-New-Star of Science and Technology supported by Guangzhou City (Grant No.: 2011J2200051). The authors would like to express their sincere gratitude to two anonymous referees for their constructive comments and useful suggestions that helped us to improve the quality of this manuscript.

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Authors and Affiliations

  1. Department of Water Resources and Environment, Geography and Planning School, Sun Yat-sen University, 135 Xingangxi Road, Guangzhou, 510275, People’s Republic of China

    Yanhu He, Kairong Lin & Xiaohong Chen

  2. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong Higher Education Institutes, Guangzhou, 510275, China

    Yanhu He, Kairong Lin & Xiaohong Chen

  3. College of Environment and plant protection, Hainan University, Haikou, 570228, China

    Changqing Ye

  4. Water for a Healthy Country Flagship, CSIRO Land and Water, Canberra, ACT, Australia

    Lei Cheng

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  1. Yanhu He
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  2. Kairong Lin
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  3. Xiaohong Chen
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  4. Changqing Ye
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  5. Lei Cheng
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Correspondence to Kairong Lin.

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He, Y., Lin, K., Chen, X. et al. Classification-Based Spatiotemporal Variations of Pan Evaporation Across the Guangdong Province, South China. Water Resour Manage 29, 901–912 (2015). https://doi.org/10.1007/s11269-014-0850-5

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  • DOI: https://doi.org/10.1007/s11269-014-0850-5

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