Seasonal forecasts in the Sahel region: the use of rainfall-based predictive variables

In the Sahel region, seasonal predictions are crucial to alleviate the impacts of climate variability on populations' livelihoods. Agricultural planning (e.g., decisions about sowing date, fertilizer application date, and choice of crop or cultivar) is based on empirical predictive indices whos...

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Veröffentlicht in:Theoretical and applied climatology 2014-08, Vol.117 (3-4), p.485-494
Hauptverfasser: Lodoun, Tiganadaba, Sanon, Moussa, Giannini, Alessandra, Traoré, Pierre Sibiry, Somé, Léopold, Rasolodimby, Jeanne Millogo
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container_title Theoretical and applied climatology
container_volume 117
creator Lodoun, Tiganadaba
Sanon, Moussa
Giannini, Alessandra
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Somé, Léopold
Rasolodimby, Jeanne Millogo
description In the Sahel region, seasonal predictions are crucial to alleviate the impacts of climate variability on populations' livelihoods. Agricultural planning (e.g., decisions about sowing date, fertilizer application date, and choice of crop or cultivar) is based on empirical predictive indices whose accuracy to date has not been scientifically proven. This paper attempts to statistically test whether the pattern of rainfall distribution over the May–July period contributes to predicting the real onset date and the nature (wet or dry) of the rainy season, as farmers believe. To that end, we considered historical records of daily rainfall from 51 stations spanning the period 1920–2008 and the different agro-climatic zones in Burkina Faso. We performed (1) principal component analysis to identify climatic zones, based on the patterns of intra-seasonal rainfall, (2) and linear discriminant analysis to find the best rainfall-based variables to distinguish between real and false onset dates of the rainy season, and between wet and dry seasons in each climatic zone. A total of nine climatic zones were identified in each of which, based on rainfall records from May to July, we derived linear discriminant functions to correctly predict the nature of a potential onset date of the rainy season (real or false) and that of the rainy season (dry or wet) in at least three cases out of five. These functions should contribute to alleviating the negative impacts of climate variability in the different climatic zones of Burkina Faso.
doi_str_mv 10.1007/s00704-013-1002-1
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subjects Agricultural and forest climatology and meteorology. Irrigation. Drainage
Agronomy. Soil science and plant productions
Analysis
application timing
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Biological and medical sciences
Climate change
Climate variability
Climatic zones
Climatology
Climatology. Bioclimatology. Climate change
Cultivars
discriminant analysis
Dry season
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Exact sciences and technology
External geophysics
farmers
Fertilizer application
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Irrigation. Drainage
livelihood
Meteorology
Original Paper
planning
prediction
principal component analysis
Principal components analysis
rain
Rain and rainfall
Rainfall distribution
Rainfall measurement
Rainy season
Sahel
Seasons
sowing date
Waste Water Technology
Water Management
Water Pollution Control
Weather forecasting
wet season
title Seasonal forecasts in the Sahel region: the use of rainfall-based predictive variables
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