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Climate Dynamics

, Volume 46, Issue 1–2, pp 637–650 | Cite as

Impact of land cover characterization on regional climate modeling over West Africa

  • Mouhamadou Bamba SyllaEmail author
  • Jeremy S. Pal
  • Guiling L. Wang
  • Peter J. Lawrence
Article

Abstract

The impact of high resolution modern vegetation cover on the West African climate is examined using the International Centre for Theoretical Physics Regional Climate Model implementing the NCAR Community Land Model. Two high resolution 25 km long-term simulations driven by the output from a coarser 50-km resolution simulation are performed for the period 1998–2010. One high resolution simulation uses an earlier and coarser-resolution version of plant functional type distribution and leaf area index, while the other uses a more recent, higher-quality, and finer-resolution version of the data. The results indicate that the new land cover distribution substantially alters the distribution of temperature with warming in Central Nigeria, northern Gulf of Guinea and part of the Sahel due to the replacement of C4 grass with corn; and cooling along the coastlines of the Gulf of Guinea and in Central Africa due to the replacement of C4 grass with tropical broadleaf evergreen trees. Changes in latent heat flux appear to be largely responsible for these temperature changes with a net decrease (increase) in regions of warming (cooling). The improved land cover distribution also results in a wetter monsoon season. The presence of corn tends to favor larger precipitation amounts via more intense events, while the presence of tropical broadleaf evergreen trees tends to favor the occurrence of both more intense and more frequent events. The wetter conditions appear to be sustained via (1) an enhanced soil moisture feedback; and (2) elevated moisture transport due to increased low-level convergence in regions south of 10N where the most substantial land cover differences are present. Overall the changes induced by the improved vegetation cover improve, to some extent, the performance of the high resolution regional climate model in simulating the main West African summer monsoon features.

Keywords

Regional climate modeling Land cover distribution Turbulent fluxes West African summer monsoon climate 

Notes

Acknowledgments

This work was supported by funding from the National Science Foundation (AGS-1049017, AGS-1048186). We would like to extend our gratitude to the ICTP Earth System Physics section and RegCNET for the development, testing and maintenance of the regional climate model used in this study.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Mouhamadou Bamba Sylla
    • 1
    • 2
    Email author
  • Jeremy S. Pal
    • 2
  • Guiling L. Wang
    • 3
  • Peter J. Lawrence
    • 4
  1. 1.West African Science Service Center on Climate Change and Adapted Landuse (WASCAL), WASCAL Competence CenterOuagadougouBurkina Faso
  2. 2.Department of Civil Engineering and Environmental ScienceLoyola Marymount UniversityLos AngelesUSA
  3. 3.Department of Civil and Environmental EngineeringUniversity of ConnecticutStorrsUSA
  4. 4.Cooperative Institute for Research in Environmental SciencesUniversity of ColoradoBoulderUSA

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