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Water 2017, 9(12), 971; https://doi.org/10.3390/w9120971

Changes in Pan Evaporation and Their Attribution to Climate Factors in the Zoige Alpine Wetland, the Eastern Edge of the Tibetan Plateau (1969–2014)

1
Beijing Key Laboratory of Wetland Services and Restoration, Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
2
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
3
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources & Hydropower, Sichuan University, Chengdu 610065, China
4
China Environmental Impact Assessment, Beijing 100012, China
*
Author to whom correspondence should be addressed.
Received: 20 October 2017 / Revised: 7 December 2017 / Accepted: 8 December 2017 / Published: 14 December 2017
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Abstract

Decreases in pan evaporation (Epan) over the last decades have been reported in many regions of the world. In this study, changes of Epan in the Zoige Plateau alpine wetland (hereinafter referred to as “Zoige wetland”) and its peripheral regions from 1969 to 2014 were investigated using the PenPan model based on the long-term meteorological data. The contribution of climate factors to Epan change were quantified by using partial derivatives of the PenPan model. Results indicated that Epan in Zoige wetland exhibited an obvious decreasing trend before 1989, but rapidly increased after 1990. The increase in Epan in the Zoige wetland is more significant than that in its peripheral regions and the entire Tibetan Plateau, which contributed to the more significant warming in the Zoige wetland. The pan evaporation in Zoige wetland after 1990 could be mostly attributed to changes in the aerodynamic component, and the decreasing radiation and wind speed is the primary contributor to the decline of pan evaporation during 1969–1989, while increasing air temperature and vapor pressure deficit were the major contributors to the increase of pan evaporation after 1990. View Full-Text
Keywords: pan evaporation; contributions; Zoige wetland; trends analysis; impact factors pan evaporation; contributions; Zoige wetland; trends analysis; impact factors
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Zhao, N.; Gou, S.; Zhang, B.; Yu, Y.; Han, S. Changes in Pan Evaporation and Their Attribution to Climate Factors in the Zoige Alpine Wetland, the Eastern Edge of the Tibetan Plateau (1969–2014). Water 2017, 9, 971.

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