Assessing rangeland drought in South Africa

Pisani, L.G. du; Fouché, H.J.; Venter, J. C.

doi:10.1016/s0308-521x(98)00024-9

Cited by 36 publications

(20 citation statements)

References 7 publications

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“…Large-scale die-offs of cattle population should be treated as an emergency warranting immediate actions. The effect of cattle mortality in the absence of replacement results in slow herd recovery (Illius et al, 1998;du Pisani et al, 1998). The principal aim of drought management policies is, therefore, to understand the extent to which mortality influences cattle demography and if necessary to intervene to increase offtake or help the pastoralists replace breeding females during recovery.…”

Section: Implications For Drought Management Policymentioning

confidence: 99%

The effect of multiple droughts on cattle in Obbu, Northern Kenya

Oba

2001

Journal of Arid Environments

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Section: Implications For Drought Management Policymentioning

confidence: 99%

The effect of multiple droughts on cattle in Obbu, Northern Kenya

Oba

2001

Journal of Arid Environments

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“…A number of indices were developed during the 20th century for drought quantification, monitoring and analysis (Du Pisani et al, 1998;Heim, 2002;Keyantash and Dracup, 2002).…”

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confidence: 99%

A Multiscalar Drought Index Sensitive to Global Warming: The Standardized Precipitation Evapotranspiration Index

2010

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Abstract. We propose a new climatic drought index: the Standardized PrecipitationEvapotranspiration Index (SPEI). The SPEI is based on precipitation and temperature data, and has the advantage of combining a multi-scalar character with the capacity to include the effects of temperature variability on drought assessment. The procedure to calculate the index is detailed, and involves a climatic water balance, the accumulation of deficit/surplus at different time scales, and adjustment to a Log-logistic probability distribution.Mathematically, the SPEI is similar to the Standardized Precipitation Index (SPI), but includes the role of temperature. As the SPEI is based on a water balance, it can be compared to the self-calibrated Palmer Drought Severity Index (sc-PDSI). We compared time series of the three indices for a set of observatories with different climate characteristics, located in different parts of the world. Under global warming conditions only the sc-PDSI and SPEI identified an increase in drought severity associated with higher water demand due to evapotranspiration. Relative to the sc-PDSI, the SPEI has the advantage of being multi-scalar, which is crucial for drought analysis and monitoring.

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“…가뭄을 대응하고 관리하기 위하여 전 세계적으로 다양한 가뭄지수가 개발되어 가뭄의 심도(severity)를 정량화하려 는 연구가 있었고, 관심분야에 따라 각기 다른 변수들을 이용한 가뭄지수로 가뭄의 심도와 기간을 분석하고 있다 (Du Pisani et al, 1998;Heim, 2002;Keyantash and Dracup, 2002). 대표적인 가뭄지수는 PDSI (Palmer Drought Severity Index, Palmer, 1965), SMI(Soil Moisture Index), SPI (Standardized Precipitation Index;McKee, 1993), SWSI(Surface Water Supply Index; Shafer and Dezman, 1982) 가뭄은 특정 지역에서 어느 정도 긴 기간 동안의 강수와 증발산 사이의 물수지(water budget)에 대한 평균 조건, 즉 정상상태와 비교하여 고려되어야 한다 (김병식 등, 2011).…”

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Assessment of Drought Severity over South Korea using Standardized Precipitation Evapo-transpiration Index (SPEI)

김병식¹,

성장현²,

강현석³

et al. 2012

Journal of Korea Water Resources Association

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Drought is a non-negligible disaster of nature and it is mainly caused by rainfall shortage for a long time though there are many definitions of drought. 'Standard Precipitation Index' (SPI) that is widely used to express the level of meteorological drought intensity has a limit of not being able to consider the hydrological changes such as rainfall and evapotranspiration caused by climate change, because it does not consider the temperature-related variables other than the precipitation. Recently, however, 'Standardized Precipitation Evapotranspiration Index' (SPEI), a drought index of new concept which is similar to SPI but can reflect the effect of temperature variability as well as the rainfall change caused by climate variation, was developed. In this study, the changes of drought occurrence in South Korea were analyzed by applying SPEI for meteorological data (1973～2011) of 60 climate observatories under Korea Meteorological Administration (KMA). As the result of application, both of SPI and SPEI showed the trend of deepening drought in spring and winter and mitigating drought in summer for the entire nation, with SPI showing greater drought intensity than SPI. Also, SPI and SPEI with 12 months of duration showed that severe droughts with low frequency of around 6 years are generally being repeated.

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Assessing rangeland drought in South Africa

Cited by 36 publications

References 7 publications

The effect of multiple droughts on cattle in Obbu, Northern Kenya

The effect of multiple droughts on cattle in Obbu, Northern Kenya

A Multiscalar Drought Index Sensitive to Global Warming: The Standardized Precipitation Evapotranspiration Index

Assessment of Drought Severity over South Korea using Standardized Precipitation Evapo-transpiration Index (SPEI)

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