Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with <scp>NAO</scp>

Abatan, Abayomi A.; Abiodun, Babatunde J.; Gutowski, William J.; Rasaq-Balogun, Saidat O.

doi:10.1002/joc.5196

Cited by 23 publications

(17 citation statements)

References 47 publications

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“…The only nationwide study of climate extremes in Nigeria is that recently carried out by Abatan et al (, ). Abatan et al () used daily station temperature data from 1971 to 2012 with focus on percentile‐based temperature extreme indices to show that there is a significant increase in the fraction of hot extremes and a decrease in the fraction of cold extremes at seasonal and annual timescales.…”

Section: Introductionmentioning

confidence: 99%

“…Abatan et al () used daily station temperature data from 1971 to 2012 with focus on percentile‐based temperature extreme indices to show that there is a significant increase in the fraction of hot extremes and a decrease in the fraction of cold extremes at seasonal and annual timescales. On the other hand, Abatan et al () used both an observed and an ERA‐20C gridded temperature data set to study trends in absolute temperature extreme indices from 1971 to 2012. Their analysis showed that the frequency and intensity of extreme temperature events over Nigeria are more pronounced during the dry season months (November–February).…”

Section: Introductionmentioning

confidence: 99%

“…Extreme analyses by Abatan et al (, ) considered 21 stations distributed across all the climatic zones in Nigeria, but these studies are limited to trends in extreme temperature indices. A further limitation of their studies is that only trends in percentile‐based threshold and absolute extreme temperature indices were analysed.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, 12 of the 24 selected stations used in the current study (Table ) were not among stations considered by Abatan et al (, tab. 1; , tab. 1).…”

Section: Introductionmentioning

confidence: 99%

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Observed changes in climate extremes in Nigeria

Gbode

Adeyeri

Menang

et al. 2019

Meteorological Applications

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The study presents observed changes in climate extremes using daily precipitation and temperature data over 24 stations, covering the three climatic zones (Guinea coast, Savannah and Sahel) of Nigeria for the period 1971–2013. The data were homogenized with Expert Team on Climate Change Detection Indices (ETCCDI) RHtests version 4 software. RClimDex version 1.0 software was used to calculate 17 of the ETCCDI recommended precipitation and temperature extreme indices. The spatio‐temporal variation in the observed trends was analysed over each of the climatic zone. Results show a significant increase in the frequencies of warm spell, warm days and nights and decreasing cold spell, cold days and nights over the three climatic zones. A significant increase in annual total precipitation was found in some stations across the Guinea coast and Sahel zones. Changes in consecutive dry days and consecutive wet days are non‐significant in most stations. Also, a significant increase in extremely wet days was observed in a few stations across the three climatic zones. The implication of the observed warming could, however, result in thermal discomfort of lives in areas with significant positive trends. This could also exert pressure on the economy's power sector, as energy demand for cooling will increase. The increase in total annual precipitation will potentially be favourable for hydropower generation and increase the availability of the potable water supply for both industrial and domestic uses in the country. However, the increase in consecutive dry days and the decrease in consecutive wet days are dangerous for agricultural practices and, hence, food security.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In addition, 12 of the 24 selected stations used in the current study (Table ) were not among stations considered by Abatan et al (, tab. 1; , tab. 1).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Observed changes in climate extremes in Nigeria

Gbode

Adeyeri

Menang

et al. 2019

Meteorological Applications

View full text Add to dashboard Cite

show abstract

“…The development of droughts involves numerous interacting climate processes and various land-atmosphere feedbacks [85]. In particular, the vertical velocity (also represented by omega) has usually been used for drought assessment [86,87]. A vertical cross-section of the mean values and anomalies of omega for the peak month of the most severe drought episodes that affected each climate sub-region between 1980 and 2017 is shown in the top and bottom panels of Figure 8, respectively.…”

Section: Characteristics Of the Most Severe Meteorological Drought Epmentioning

confidence: 99%

Trends and Extremes of Drought Episodes in Vietnam Sub-Regions during 1980–2017 at Different Timescales

Stojanović

Liberato

Sorí

et al. 2020

Water

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This study investigated the temporal occurrence of dry conditions in the seven climatic sub-regions of Vietnam during the 1980–2017 period. This assessment was performed using the Standardized Precipitation Evapotranspiration Index (SPEI) and the Standardized Precipitation Index (SPI) at 1 to 24 months timescales. Results show that the main periods of extreme drought occurred simultaneously throughout the country in 1992–1993 and 2003–2004, except for 2015–2016, when it was not identified in the southern region. In addition, a slight temporal lag was identified latitudinally (north–south) at the beginning of dry conditions, revealing the largest difference between the northern and southern regions. A positive trend in the time series of both indices (SPEI and SPI) prevailed in all sub-regions, with the SPEI minus SPI difference always being negative, suggesting the importance of temperature and evapotranspiration for this trend. Further detailed analyses were then performed using SPEI at 1-month and 12-months timescales for all climate sub-regions, as well as the main indicators to characterize duration and severity. Results show that the number of drought episodes did not vary much between regions, but they did vary in duration and severity at the annual scale. Moreover, changes in the soil root zone are largely associated with dry and wet conditions not only from season to season, but also in longer accumulation periods and more strongly in the northern regions of Vietnam. Indeed, a study of the most severe drought episodes also revealed the occurrence of negative anomalies of the root-soil moisture in the subsequent four or more months. Dynamic atmospheric conditions associated with the peak of most severe drought episodes show the crucial role of subsidence of dry air in the middle and high atmosphere, which prevents convection in the lower troposphere. Finally, the linkages between drought conditions in Vietnam and large-scale atmospheric and oceanic teleconnection patterns were revealed to be quite different among northern and southern sub-regions. During the positive phase of El Niño–Southern Oscillation (ENSO), drought episodes at different timescales were identified in the southern climate sub-regions, while the negative phase was associated with drought conditions in the northern regions.

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Trend analysis of cold extremes in South Africa: 1960–2016

Walt

Fitchett

2020

Intl Journal of Climatology

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Extreme cold events (“cold waves”) have disastrous impacts on ecosystem and human health. Evidence shows that these events will still occur under current increasing mean temperatures. Little research has been done on extreme cold events, especially in developing countries such as South Africa. These events pose a significant threat due to the low adaptive capacity, urgent development needs and relatively inadequate infrastructure in South Africa. This study presents annual and seasonal, spatial and temporal trend analyses of extreme cold temperature events for the period 1960–2016. We apply the World Meteorological Organisation Commission for Climatology and Indices Expert Team on Sector‐Specific Climate Indices (ET‐SCI) to South Africa for the first time, with comparison to the World Meteorological Organisation Expert Team on Climate Change Detection (ETCCDI) indices previously used in South Africa. The extreme cold indices are calculated using the RClimDex and ClimPACT, respectively. Trends were calculated using the non‐parametric Mann‐Kendall test, Spearman Rank Correlation Coefficient and Sen's slope estimates. A decreasing trend is found for annual cold spell duration and cold wave frequency, at rates of 0.10 days.day−1 and 0.02 events.day−1, respectively. Seasonally, coldest day temperatures increased in autumn, with increases of 0.02°C.day−1 for the period 1960–2016. Regionally, increasing trends in annual cold spell duration days were evident in stations located in the Western Cape, Eastern Cape, North‐West Province, at a rate of 0.03 days.day−1. Increasing trends in cold waves were observed for stations in Northern Cape, Gauteng, KwaZulu‐Natal and the Eastern Cape Province, at a rate of 0.01 events.day−1. These results contribute to the awareness and recognition of the incidence and duration of cold extreme events in South Africa, seeing that studies suggest that anomalously cold events may persist in a warming world.

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Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with NAO

Cited by 23 publications

References 47 publications

Observed changes in climate extremes in Nigeria

Observed changes in climate extremes in Nigeria

Trends and Extremes of Drought Episodes in Vietnam Sub-Regions during 1980–2017 at Different Timescales

Trend analysis of cold extremes in South Africa: 1960–2016

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