Temporal-spatial characteristics of severe drought events and their impact on agriculture on a global scale

Abstract:The Ningxia Hui Autonomous Region of China (Ningxia) is an important food production area in northwest China severely affected by drought. The Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI) were calculated based on monthly meteorological data to explore climate change and variation in drought intensity, duration, frequency, and spatial extent in Ningxia during 1972-2011 show that the SPEI is more applicable than the SPI for exploring climate change and drought variation in Ningxia. The Ningxia climate experienced a significant drying tendency. Annual SPEI decreased about 0.37 decade −1 during 1972-2011. Drought was exacerbated by this drying tendency. Regional average duration, maximum duration, intensity, and frequency of drought identified by the SPEI increased by one month, three months, 0.15%, and 36.1%, respectively, during 1992-2011 compared to the period of 1972-1991. The spatial extent of drought identified by the SPEI increased about 14.4% decade −1 in the spring during 1972-2011. Spatially, drought frequency increased from north to south. Average intensity (maximum duration) of drought calculated by the SPEI increased (decreased) northward and southward from the central arid area.

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“…Drought frequency (Fs) was used to assess the drought liability during a study period [3]. It is calculated by:…”

Section: Drought Frequencymentioning

confidence: 99%

“…Usually, the SPI/SPEI values at the 12-month time scale for December indicate the status of year-round water deficit caused by drought [3]. Additionally, the SPI/SPEI values at a 3-month scale are appropriate indicators of the status of seasonal water deficit caused by drought.…”

Section: Spatial and Temporal Variation In The Spi And Speimentioning

confidence: 99%

Temporal-Spatial Variation of Drought Indicated by SPI and SPEI in Ningxia Hui Autonomous Region, China

2015

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“…6b). PCD/PCP and ONI (a,c,e are for PCD-ONI correlation in 1960-2014, 1960-1989, 1990-2014respectively, b,d,f are for PCP-ONI correlation in 1960-2014, 1960-1989, 1990-2014.…”

Section: Relationships Between Oni and Pcd/pcp 331 Correlation Betmentioning

confidence: 99%

“…The concentration of precipitation in space and time is very sensitive to climate change and would induce the occurrence of more frequent extreme climate events. The uneven distribution of rainfall can lead to more flood or drought, soil erosion and other related disasters, which will affect agriculture ecosystem, grass and forest ecosystem, the safety of property and citizens, and so on (Arnaud et al, 2002;Wang et al, 2014). Therefore, studying the temporal and spatial distribution of the precipitation concentration is of great importance to help us facing the risk of climate change and understanding the regularity and formation mechanism of climate change (Stott et al, 2010;Gu and Andler, 2015).…”

Section: Introductionmentioning

confidence: 99%

Variation of precipitation concentration from 1960 to 2014 in the Middle and Lower reaches of the Yangtze River Basin, China

Zhao¹,

Wang²,

Zhao³

et al. 2016

CIG

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“…Among them, drought is one of the most serious meteorological disasters because of its high frequency, long duration, and wide range of effects [1,2]. In recent years, drought has caused huge losses to agriculture [3]. Moreover, it has prompted intensified desertification and a high frequency of dust storms and falling water levels, which poses a great threat to the ecological environment and social economy [4,5].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Variability Characteristics of Regional Drought during 1964–2013 in Horqin Sandy Land, China

Zhang

Guo

et al. 2016

Water

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Drought has an important influence on the hydrological cycle, ecological system, industrial and agricultural production, and social life. Based on the different time scales of characteristics of drought variability, the standardized precipitation evapotranspiration index (SPEI), a multi-timescale index with consideration of evaporation, was used in this study to estimate the spatial and temporal variability characteristics of drought. Climatic data from 15 meteorological stations across Horqin Sandy Land during 1964-2013 were used to calculate the SPEI of 1, 3, 6, and 12 months. In order to examine the relationship between droughts and other variables, 10 extreme climate indices were calculated based on the daily precipitation and maximum/mean/minimum temperature data of 15 meteorological stations, and linkages between SPEI-12 and atmosphere indices were established using by the cross wavelet transform method. The results indicated that the climate of Horqin Sandy Land had a tendency towards drought conditions, which is particularly apparent from the year 2000 onwards. During the study period, drought events were frequent in the region. Mild drought occurred in a quarter of the month, with that of moderate, severe, and extreme drought accounting for 0.11, 0.05, and 0.02 of the total months. The spatial trend of multi-timescale drought revealed that there was an increase in the severity of drought throughout Horqin Sandy Land, among which the magnitude in southern parts was larger than that of northern parts. The results also showed that the short time scale drought negatively correlated with precipitation extremes and positively correlated with temperature extremes. Furthermore, the long time scale drought (SPEI-12) was associated with atmosphere indices. Significant resonance periods were found between El Nino southern oscillation (ENSO), the East Asian summer monsoon index (EASMI), and SPEI-12.

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Temporal-spatial characteristics of severe drought events and their impact on agriculture on a global scale

Cited by 196 publications

References 70 publications

Temporal-Spatial Variation of Drought Indicated by SPI and SPEI in Ningxia Hui Autonomous Region, China

Temporal-Spatial Variation of Drought Indicated by SPI and SPEI in Ningxia Hui Autonomous Region, China

Variation of precipitation concentration from 1960 to 2014 in the Middle and Lower reaches of the Yangtze River Basin, China

Estimation of Variability Characteristics of Regional Drought during 1964–2013 in Horqin Sandy Land, China

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