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Article

Spatiotemporal Variation in Relative Humidity in Guangdong, China, from 1959 to 2017

by 1, 1,2,* and 1
1
Research Center for Ecological Civilization Construction and Sustainable Development in Xijiang & Beijiang River Basin of Guangdong Province, Foshan University, Foshan 528000, China
2
Department of Geography and Environment Science, University of Reading, Reading RG6 6AB, UK
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3576; https://doi.org/10.3390/w12123576
Received: 16 September 2020 / Revised: 15 December 2020 / Accepted: 15 December 2020 / Published: 20 December 2020
Despite the marked influence of relative humidity (RH) on ecosystems and human society, the spatiotemporal pattern of RH is far from clearly understood. This study analyzed the spatiotemporal variation in RH in Guangdong Province, South China, in the period of 1959–2017. The RH data were collected from 74 national standard meteorological stations. The spatiotemporal variation in RH was evaluated using rotate empirical orthogonal function (REOF) zoning, Mann–Kendall test, and wavelet transform methods. Based on the REOF decomposition situation of monthly RH field, Guangdong was divided into six subareas. The annual mean of RH in the whole province was 78.90%. In terms of spatial variation, overall annual mean RH decreased from southwest to northeast in the province. Temporally, annual mean RH showed a declining trend in the last six decades. Particularly, the RH in the Pearl River Delta area declined at the rate of 1.349%/10a. Mann–Kendall tests showed that mutation points of annual mean RH mostly appeared in the 1990s, especially in the early 1990s. Continuous wavelet transforms of annual mean RH displayed that inland subareas have similar cycle characteristics, and the east coast and Pearl River Delta have no significant period in most time domains. The results provide new understanding of RH variation in the last six decades in South China, which is valuable for detecting climate change, monitoring hazardous weather, and predicting future environmental change. View Full-Text
Keywords: relative humidity; climate change; spatiotemporal variation; REOF decomposition method; Guangdong, China relative humidity; climate change; spatiotemporal variation; REOF decomposition method; Guangdong, China
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MDPI and ACS Style

Liu, Z.; Yang, H.; Wei, X. Spatiotemporal Variation in Relative Humidity in Guangdong, China, from 1959 to 2017. Water 2020, 12, 3576. https://doi.org/10.3390/w12123576

AMA Style

Liu Z, Yang H, Wei X. Spatiotemporal Variation in Relative Humidity in Guangdong, China, from 1959 to 2017. Water. 2020; 12(12):3576. https://doi.org/10.3390/w12123576

Chicago/Turabian Style

Liu, Zhanming, Hong Yang, and Xinghu Wei. 2020. "Spatiotemporal Variation in Relative Humidity in Guangdong, China, from 1959 to 2017" Water 12, no. 12: 3576. https://doi.org/10.3390/w12123576

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