Continuous Wetting on the Tibetan Plateau during 1970–2017

Zhang, Huamin; Ding, M. D.; Li, Lanhui; Liu, Linshan

doi:10.3390/w11122605

Cited by 15 publications

(9 citation statements)

References 53 publications

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“…The MK is a non-parametric test that compares the presence of a trend in a time-series to the null hypothesis that there is no trend [102]. The WMO strongly recommends the MK test when examining meteorological and hydrological variables [102,103], and it has been widely used in environmental research for temporal trend analysis [102,104]. The significance of the trends was tested in this study at the α = 0.05 significance level.…”

Section: Trend Analysis Mann-kendall Test and Theil-sen Slope Estimatormentioning

confidence: 99%

Spatiotemporal Characteristics of Meteorological Drought and Wetness Events across the Coastal Savannah Agroecological Zone of Ghana

Ankrah

Monteiro

Madureira

2023

Water

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Drought and wetness events have become common due to global warming, warranting the need for continuous analysis and monitoring of drought and wet events to safeguard people’s livelihoods. In this study, the Standardized Precipitation Evapotranspiration Index (SPEI) was utilized to analyze the spatiotemporal characteristics of drought and wetness events in the coastal Savannah agroecological zone from 1981 to 2021. Climate data from 14 locations across the zone were used to characterize drought and wetness events at the 3 and 12 month timescales. Except for September 1995 and November 2002, when changepoints occurred, the results revealed the homogeneous nature of temperature and rainfall in the zone. More drought events were observed in the dry and minor seasons, while the wet season had more wetness events under both the SPEI-3 and SPEI-12 timescales. The results also showed that, while moderate-to-severe drought events were common for most years, extreme drought events were more typical in the 1980s and 1990s than in the 2000s under both the SPEI-3 and SPEI-12. Furthermore, the 2000s saw more moderate-to-severe wetness events than the 1980s and 1990s, while the greatest number of extreme wetness events occurred in 1987, followed by 1997 and 2021 under the SPEI-3, and a few moderate-to-extreme wetness events occurred in 1987, 1991, 1997–1998, 2012–2013, 2018, and 2020–2021 under the SPEI-12. Under the SPEI-12, only extreme drought events showed a significant positive trend with a small magnitude of change. On the spatial scale, drought and wetness events occurred more frequently in the Central and Volta regions than in the Greater Accra region; however, the intensity and duration of the events were stronger and lasted longer in the Greater Accra and Central regions than in the Volta region. The regular monitoring of drought and wetness events is required to protect the livelihoods of people in the zone.

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Section: Trend Analysis Mann-kendall Test and Theil-sen Slope Estimatormentioning

confidence: 99%

Spatiotemporal Characteristics of Meteorological Drought and Wetness Events across the Coastal Savannah Agroecological Zone of Ghana

Ankrah

Monteiro

Madureira

2023

Water

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“…Wang et al considered that drought is caused by a decrease in precipitation and an increase in temperature [39]. Some scholars have also found that the TP has experienced a continuous wet trend since the 1950s [40][41][42][43][44]. The prolonged rainy season and increased precipitation can effectively alleviate drought in the region [41,43].…”

Section: Introductionmentioning

confidence: 99%

Variation in Reference Evapotranspiration over the Tibetan Plateau during 1961–2017: Spatiotemporal Variations, Future Trends and Links to Other Climatic Factors

Liu

Wang

Yao

et al. 2020

Water

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Reference evapotranspiration (ET0) is a key factor in the hydrological cycle and energy cycle. In the context of rapid climate change, studying the dynamic changes in ET0 in the Tibetan Plateau (TP) is of great significance for water resource management in Asian countries. This study uses the Penman–Monteith formula to calculate the daily ET0 of the TP and subsequently uses the Mann–Kendall (MK) test, cumulative anomaly curve, and sliding t-test to identify abrupt change points. Morlet wavelet analysis and the Hurst index based on rescaled range analysis (R/S) are utilized to predict the future trends of ET0. The Spearman correlation coefficient is used to explore the relationship between ET0 changes and other climate factors. The results show that the ET0 on the TP exhibited an increasing trend from 1961 to 2017, with the most significant increase occurring in winter; an abrupt change to a tendency to decrease occurred in 1988, and another abrupt change to a tendency to increase occurred in 2005. Spatially, the ET0 of the TP shows an increasing trend from east to west. The change trend of the ET0 on the TP will not be sustainable into the future. In addition, the mean temperature has the greatest impact on the ET0 changes in the TP.

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“…Frontiers in Environmental Science frontiersin.org degree of drought trended to ease, and the evolution of drought had noticeable interdecadal differences after 1997 (Liang et al, 2018). During the growth season, though the northeastern and southern parts experienced a significant wetting trend, the eastern fringe of the QTP tended to be dry, and this trend will continue (Zhang et al, 2019). The altitude dependence of drought characteristics was investigated based on SPEI and 4,000 m a. s. l was determined as the dividing line, the higher the altitude, the greater the changing trend (Feng et al, 2020).…”

Section: Figurementioning

confidence: 99%

Spatial gathering characteristics of drought in the Qinghai-Tibet Plateau

Yuan

Liang

et al. 2022

Front. Environ. Sci.

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Due to climate change, drought has caused serious impacts on the eco-environment, hydrology and agriculture, and drought events in the Qinghai-Tibet Plateau (QTP) have become more severer and frequent; therefore, understanding the characteristics and variations of drought is crucial to reduce its eco-environmental and socio-economic impacts. This study used the Standardized Precipitation Evapotranspiration Index (SPEI) to identify drought and assessed its interannual changes from 1980 to 2020. Then, the Hurst exponent and intensity analysis were used to identify future drought trend and the characteristics of drought intensity. Moreover, Empirical Orthogonal Function (EOF) analysis was performed to examine the main spatial gathering characteristics. The results indicate that: 1) the QTP was becoming wetter in general, and drying places were mainly distributed in the southeast and northeast of the QTP, as well as the Qaidam Basin accounting for 27% areas of QTP. 2) The trend of wet and dry in the future in most regions would be the same as the present, only 10% of the regions would have the reverse trend. 3) The rate of wet/drought changes was faster in the 1980s and 2000s. 4) The EOF mode1 revealed a gathering distribution structure with negative values in the southeast and east of the QTP and positive values in the center and west. The west was more sensitive to the variation of dry and wet, and most areas will continue to be wet in the future. EOF mode2 and mode3 mainly indicated opposite gathering patterns of southwest-northeast and south-north. The results provide favorable evidence for policymakers to better understand and prevent drought.

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Continuous Wetting on the Tibetan Plateau during 1970–2017

Cited by 15 publications

References 53 publications

Spatiotemporal Characteristics of Meteorological Drought and Wetness Events across the Coastal Savannah Agroecological Zone of Ghana

Spatiotemporal Characteristics of Meteorological Drought and Wetness Events across the Coastal Savannah Agroecological Zone of Ghana

Variation in Reference Evapotranspiration over the Tibetan Plateau during 1961–2017: Spatiotemporal Variations, Future Trends and Links to Other Climatic Factors

Spatial gathering characteristics of drought in the Qinghai-Tibet Plateau

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