The relationship between the Sahelian and previous 2nd Guinean rainy seasons: a monsoon regulation by soil wetness?
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Abstract. The correlation of 0.61 found between observed July–September Sahelian rainfall in year 0 and September–November Guinean rainfall in year - 1, led us to explore the statistical relationships between precipitation, soil moisture and near surface Moist Static Energy (MSE) gradients in West Africa. These analyses were performed over successive 30-year periods and specifically, the most recent period between 1968–1998. It is shown from observations, National Centers for Environmental Predictions and National Center for Atmospheric Research (NCEP/NCAR) reanalyses and from the Global Soil Wetness Project (GSWP) database, that wet Sahelian rainy seasons are preceded by abnormally wet soils over the Sudan-Guinean belt during northern winter. Such moisture anomalies tend to hold during the dry season, then generate increasing MSE gradients just above the continent by March–April. These gradients have been shown to be of prime importance for monsoon dynamics and associated rainfall.Key words. Hydrology (soil moisture) – Meteorology and atmospheric dynamics (climatology)
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A seasonal correlation between autumn Guinean rainfall and the following summer Sahel rainfall has been found and evaluated by other authors, mainly as the result of soil moisture conditions persistence and developed vegetation interactions.
“a seasonal correlation between autumn Guinean rainfall and the following summer Sahel rainfall has been found and evaluated by other authors, mainly as the result of the soil moisture conditions persistence and the developed vegetation interactions (Philippon and Fontaine 2002;Fontaine et al. 2002;Douville et al. 2007).”
From Tropical Atlantic variability modes (1979-2002). Part I: Time-evolving SST modes related to West African rainfall (2008) · cites this paper as Philippon and Fontaine 2002
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Experimental — accuracy not yet measuredThe ocean is not the only factor explaining WA rainfall variability; land surface processes and the role of soil moisture and vegetation are also crucial factors.
“the ocean is not the only factor explaining the WA rainfall variability, and the interaction with land surface processes and the role played by soil moisture and vegetation are also crucial factors (Douville 2002;Philippon and Fontaine 2002).”
From Tropical Atlantic variability modes (1979-2002). Part I: Time-evolving SST modes related to West African rainfall (2008) · cites this paper as Philippon and Fontaine 2002
The Introduction identifies both sea-surface temperatures and land-surface properties as influences on West African rainfall. The Conclusion says rainfall variability could be partly controlled by land–atmosphere feedback involving soil moisture, while the Discussion says vegetation processes can contribute. The paper therefore supports the importance of land processes, but treats vegetation’s role as a possibility rather than establishing it as a crucial factor. (LLM, conf=0.83)
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References 20 · Cited by 41
- Authors
- Philippon, N., & Fontaine, B.
- Affiliations
- Centre National de la Recherche Scientifique (FR)
- ORCID
- Philippon, N.
- Venue
- Annales Geophysicae
- Publisher
- Copernicus GmbH
- Published
- 2002-04-30
- Volume
- 20
- Issue
- 4
- Pages
- 575-582
- ISSN
- 0992-7689 (ISSN-L)
- 1432-0576
- OpenAlex
- W2135383426
- Cited by
- 41
- References
- 20
- Citations by year
- 2020: 1 · 2018: 2 · 2016: 1 · 2015: 5 · 2014: 2 · 2013: 2 · 2012: 1
- FWCI
- 2.09
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Annales Geophysicae (publishedVersion, cc-by)
- HAL (submittedVersion, other-oa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Centre National de la Recherche Scientifique
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Meteorological Phenomena and Simulations
- Physical Sciences › Environmental Science › Global and Planetary Change › Hydrology and Drought Analysis
- Keywords
- soil moisture, precipitation anomalies, West African monsoon, NCEP/NCAR reanalysis
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