Some statistical characteristics of drought area variations in the savanna region of Nigeria

Oladipo, E. O.

doi:10.1007/bf00866113

Cited by 20 publications

(12 citation statements)

References 6 publications

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“…The western and eastern parts of the country have different climate regimes and sometimes observed to have reverse dry and wet periods. This situation is not unique to Iran and has been reported in other parts of the world (Madadgar and Moradkhani 2013;Nkemdirim and Weber 1999;Oladipo 1995;Fowler and Kilsby 2002, among others). Different wet and dry periods in the eastern versus western areas are attributed to complicated circulation patterns that are predominant in regions located in subtropical climatic transition areas, such as Iran.…”

Section: Resultsmentioning

confidence: 73%

Quantifying the reliability of four global datasets for drought monitoring over a semiarid region

Katiraie-Boroujerdy

Nasrollahi

Hsu

et al. 2015

Theor Appl Climatol

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Drought is one of the most relevant natural disasters, especially in arid regions such as Iran. One of the requirements to access reliable drought monitoring is long-term and continuous high-resolution precipitation data. Different climatic and global databases are being developed and made available in real time or near real time by different agencies and centers; however, for this purpose, these databases must be evaluated regionally and in different local climates. In this paper, a near real-time global climate model, a data assimilation system, and two gridded gauge-based datasets over Iran are evaluated. The ground truth data include 50 gauges from the period of 1980 to 2010. Drought analysis was carried out by means of the Standard Precipitation Index (SPI) at 2-, 3-, 6-, and 12-month timescales. Although the results show spatial variations, overall the two gauge-based datasets perform better than the models. In addition, the results are more reliable for the western portion of the Zagros Range and the eastern region of the country. The analysis of the onsets of the 6-month moderate drought with at least 3 months' persistence indicates that all datasets have a better performance over the western portion of the Zagros Range, but display poor performance over the coast of the Caspian Sea. Base on the results of this study, the Modern-Era Retrospective Analysis for Research and Applications (MERRA) dataset is a preferred alternative for drought analysis in the region when gauge-based datasets are not available.

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Section: Resultsmentioning

confidence: 73%

Quantifying the reliability of four global datasets for drought monitoring over a semiarid region

Katiraie-Boroujerdy

Nasrollahi

Hsu

et al. 2015

Theor Appl Climatol

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“…The high dependence of drought on precipitation is the main reason for its varied spatial effects, as has been pointed out for England (Fowler & Kilsby 2002), Nigeria (Oladipo 1995), Turkey (Komuscu 1999) and the Iberian Peninsula (Pita 1987). For this reason, in environments with high spatial and temporal variability in precipitation, it is reasonable to expect the same variability in drought.…”

Section: Introductionmentioning

confidence: 93%

drought patterns in the Mediterranean area: the Valencia region (eastern Spain)

Vicente‐Serrano¹,

González‐Hidalgo²,

Luis³

et al. 2004

Clim. Res.

155

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We studied drought patterns in the Valencia region between 1951 and 2000 using 95 monthly precipitation series and the standardized precipitation index (SPI). The general evolution of drought was obtained by principal component analysis. The spatial patterns of the most significant components did not overlap. We also found differences in the frequency, duration and intensity of drought between areas. Drought increased significantly in the mid to northern area, whereas in the rest of the region the spatial patterns were more complex. Variability seems to be the main characteristic related to local factors. The results of these subregional analyses show that great caution should be exercised when applying global output results at the subregional level when such extreme events are managed.

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“…It is very common for one area to suffer dry conditions, whilst neighbouring areas experience normal or even humid conditions. This pattern has been recorded in countries as diverse as Nigeria (Oladipo, 1995), England (Fowler & Kilsby, 2002), Turkey (Komuscu, 1999) and Canada (Nkemdirim & Weber, 1999). Such variation is often attributable to complex atmospheric circulation patterns, complicated by the fact that droughts cannot be associated with a single type of atmospheric condition.…”

Section: Introductionmentioning

confidence: 97%

Spatial and temporal analysis of droughts in the Iberian Peninsula (1910–2000)

Vicente‐Serrano

2006

Hydrological Sciences Journal

202

116

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The evolution of droughts in the Iberian Peninsula from 1910 to 2000 is analysed. Fifty-one monthly precipitation series, distributed homogeneously over the region were examined. Drought analysis was carried out by means of the standardized precipitation index, at a 12-month temporal scale. The main drought episodes were identified at the scale of the entire Iberian Peninsula, with the most intense droughts recorded in the 1940s, 1950s, 1980s and 1990s. However, the spatial distribution of drought episodes can be very diverse. The Peninsula was divided into four homogeneous areas according to drought history. These areas are well-defined spatially as the north, northeast, southeast and central/western areas. The main drought episodes usually affected wide areas of the Iberian Peninsula, but sometimes a drought episode affects one region, whilst other areas are subject to humid conditions. The possible causes of the spatial differences in temporal drought behaviour are discussed, and the usefulness of drought regionalization in the context of drought management schemes is highlighted.

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Some statistical characteristics of drought area variations in the savanna region of Nigeria

Cited by 20 publications

References 6 publications

Quantifying the reliability of four global datasets for drought monitoring over a semiarid region

Quantifying the reliability of four global datasets for drought monitoring over a semiarid region

drought patterns in the Mediterranean area: the Valencia region (eastern Spain)

Spatial and temporal analysis of droughts in the Iberian Peninsula (1910–2000)

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