Changes in precipitation seasonality in West Africa predicted by RegCM3 and the impact of dynamic vegetation feedback

Guiling Wang, Clement Alo

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)

Abstract

Using a regional climate model asynchronously coupled to a dynamic vegetation model, this study examines future climate predictions for the West Africa region and how dynamic vegetation feedback may influence such predictions. Without accounting for the impact of vegetation dynamics, the model predicts a future decrease of annual rainfall over Sahel. Dynamic vegetation feedback reverses this trend, leading to a substantial increase of annual rainfall. Regardless of how vegetation is treated, the predicted future trend of precipitation in the Sahel region follows a specific seasonal pattern, with a decrease during the pre- and early-monsoon season (May-June and early July) due to the warming-induced enhancement of spring convective barrier and an increase after the monsoon is fully established (typically in July-August-September) due to enhanced moisture import from a warmer ocean. Dynamic vegetation feedback reduces the magnitude of the predicted rainfall reduction in the early season and increases the magnitude of the predicted rainfall increase later in the rainy season. The future decrease of early-season rainfall has significant agronomic implications.

Original languageEnglish
Article number597205
JournalInternational Journal of Geophysics
Volume2012
DOIs
StatePublished - 19 Sep 2012

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vegetation dynamics
vegetation
seasonality
rainfall
monsoons
monsoon
climate prediction
trends
regional climate
climate models
import
predictions
climate modeling
moisture
warming
climate
West Africa
oceans
ocean
prediction

Cite this

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abstract = "Using a regional climate model asynchronously coupled to a dynamic vegetation model, this study examines future climate predictions for the West Africa region and how dynamic vegetation feedback may influence such predictions. Without accounting for the impact of vegetation dynamics, the model predicts a future decrease of annual rainfall over Sahel. Dynamic vegetation feedback reverses this trend, leading to a substantial increase of annual rainfall. Regardless of how vegetation is treated, the predicted future trend of precipitation in the Sahel region follows a specific seasonal pattern, with a decrease during the pre- and early-monsoon season (May-June and early July) due to the warming-induced enhancement of spring convective barrier and an increase after the monsoon is fully established (typically in July-August-September) due to enhanced moisture import from a warmer ocean. Dynamic vegetation feedback reduces the magnitude of the predicted rainfall reduction in the early season and increases the magnitude of the predicted rainfall increase later in the rainy season. The future decrease of early-season rainfall has significant agronomic implications.",
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Changes in precipitation seasonality in West Africa predicted by RegCM3 and the impact of dynamic vegetation feedback. / Wang, Guiling; Alo, Clement.

In: International Journal of Geophysics, Vol. 2012, 597205, 19.09.2012.

Research output: Contribution to journalArticleResearchpeer-review

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