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Research Article Open access CC BY 4.0

Analysing Spatial Variability of Monsoon Rainfall over West Africa

Chukwudi S. Ekwezuo, Christopher U. Ezeh, Jean M. Sogbedji, Philip O. Phil-Eze

International Journal of Environment and Climate Change · pp. 77–91 · Published 26 Aug 2024

10.9734/ijecc/2024/v14i94394

Abstract

Climate variability and changes have become a topic of increasing importance in recent decades due to extreme climate events such as floods and droughts, which profoundly impact socioecological systems across West Africa during the monsoon months. This study analyses and updates rainfall variability and spatial trends during these crucial months using monthly gridded rainfall data from 1950 to 2022. We applied the ordinary least square regression test, Buishand's, Standard normal homogeneity and Pettitt's tests for trend and change point detection analyses at a 5% significant level. The spatial variability and trends in rainfall were examined across three time periods: 1950-2022, 1963-1992, and 1993-2022. Change-point detection analysis revealed that there had been significant changes in the monsoon months' rainfall variability within the study period except in August. The detection of both positive and negative trends, representing trends toward wetter and drier conditions respectively, provides valuable insights for understanding and managing the impacts of climate variability and change for the most vulnerable areas.

Trend analysis changepoint analysis spatial pattern rainfall monsoon West Africa

References (36)

  1. 1 A homogeneity test applied to precipitation data [DOI]
  2. 2 Some methods for testing the homogeneity of rainfall records [DOI]
  3. 3 The West African Sahel: A Review of Recent Studies on the Rainfall Regime and Its Interannual Variability [DOI]
  4. 4 A revised picture of the structure of the “monsoon” and land ITCZ over West Africa [DOI]
  5. 5 Rainfall trends in the African Sahel: Characteristics, processes, and causes [DOI]
  6. 6 Spatio‐temporal characteristics of the recent rainfall recovery in West Africa [DOI]
  7. 7 Change-point analysis as a tool to detect abrupt climate variations [DOI]
  8. 8 Interannual and decadal SST‐forced responses of the West African monsoon [DOI]
  9. 9 Rainfall distribution and change detection across climatic zones in Nigeria [DOI]
  10. 10 Trend analysis and change point techniques: a survey [DOI]
  11. 11 Trends in floods in West Africa: analysis based on 11 catchments in the region [DOI]
  12. 12 Change Detection and Trend Analysis of Future Temperature and Rainfall over West Africa [DOI]
  13. 13 Amplification of synoptic to annual variability of West African summer monsoon rainfall under global warming [DOI]
  14. 14 Trends and interannual variability of extreme rainfall indices over Ghana, West Africa [DOI]
  15. 15 A synthetic view of rainfall intensification in the West African Sahel [DOI]
  16. 16 Recent trends in selected extreme precipitation indices in Senegal – A changepoint approach [DOI]
  17. 17 Inconsistent changes in global precipitation seasonality in seven precipitation datasets [DOI]
  18. 18 Spatial distribution and estimation of rainfall trends and erosivity in the Epitácio Pessoa reservoir catchment, Paraíba, Brazil [DOI]
  19. 19 Interannual variability of rainfall in the Guinean Coast region and its links with sea surface temperature changes over the twentieth century for the different seasons [DOI]
  20. 20 Modelling impacts of climate change on coastal West African rainfall [DOI]
  21. 21 Spatiotemporal Characteristics of Meteorological Drought and Wetness Events across the Coastal Savannah Agroecological Zone of Ghana [DOI]
  22. 22 Spatio-temporal estimation of rainfall patterns in north and northwestern states of India between 1901 and 2015: change point detections and trend assessments [DOI]
  23. 23 Spatial and Temporal Variability of Rainfall in Eastern Amazon during the Rainy Season [DOI]
  24. 24 Spatial variability of rainfall trends in Iran [DOI]
  25. 25 Analysis of long‐term dry and wet conditions over Nigeria [DOI]
  26. 26 Spatial and Temporal Variation in Precipitation in Togo [DOI]
  27. 27 Decadal and multi-year predictability of the West African monsoon and the role of dynamical downscaling [DOI]
  28. 28 Trend and Variability Analysis of Rainfall and Extreme Temperatures in Burundi [DOI]
  29. 29 How has aridity changed over West Africa in the past four decades? [DOI]
  30. 30 Differential signal of change among multiple components of West African rainfall [DOI]
  31. 31 Trend Analysis of Rainfall and Detection of Change Point in Terai Zone of West Bengal [DOI]
  32. 32 Temporal/Spatial Distribution of Rainfall and the Associated Circulation Anomalies over West Africa
  33. 33 Trend and change point detection of seasonal rainfall for effective crop planning over southern transition zone of Karnataka, India [DOI]
  34. 34 Changes in Diurnal Temperature Range Over Nigeria from 1960 to 2019 [DOI]
  35. 35 Version 4 of the CRU TS monthly high-resolution gridded multivariate climate dataset [DOI]
  36. 36 Mean Climate and Seasonal Cycle [DOI]

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