Publication Abstracts

Dyer et al. 2017

Dyer, E.L.E., D.B.A. Jones, J. Nusbaumer, H. Li, O. Collins, G. Vettoretti, and D. Noone, 2017: Congo Basin precipitation: Assessing seasonality, regional interactions, and sources of moisture. J. Geophys. Res. Atmos., 122, no. 13, 6882-6898, doi:10.1002/2016JD026240.

Precipitation in the Congo Basin was examined using a version of the National Center for Atmospheric Research Community Earth System Model (CESM) with water tagging capability. Using regionally defined water tracers, or tags, the moisture contribution from different source regions to Congo Basin precipitation was investigated. We found that the Indian Ocean and evaporation from the Congo Basin were the dominant moisture sources and that the Atlantic Ocean was a comparatively small source of moisture. In both rainy seasons the southwestern Indian Ocean contributed about 21% of the moisture, while the recycling ratio for moisture from the Congo Basin was about 25%. Near the surface, a great deal of moisture is transported from the Atlantic into the Congo Basin, but much of this moisture is recirculated back over the Atlantic in the lower troposphere. Although the southwestern Indian Ocean is a major source of Indian Ocean moisture, it is not associated with the bulk of the variability in precipitation over the Congo Basin. In wet years, more of the precipitation in the Congo Basin is derived from Indian Ocean moisture, but the spatial distribution of the dominant sources is shifted, reflecting changes in the midtropospheric circulation over the Indian Ocean. During wet years there is increased transport of moisture from the equatorial and eastern Indian Ocean. Our results suggest that reliably capturing the linkages between the large-scale circulation patterns over the Indian Ocean and the local circulation over the Congo Basin is critical for future projections of Congo Basin precipitation.

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BibTeX Citation

  author={Dyer, E. L. E. and Jones, D. B. A. and Nusbaumer, J. and Li, H. and Collins, O. and Vettoretti, G. and Noone, D.},
  title={Congo Basin precipitation: Assessing seasonality, regional interactions, and sources of moisture},
  journal={Journal of Geophysical Research: Atmospheres},

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RIS Citation

ID  - dy07000h
AU  - Dyer, E. L. E.
AU  - Jones, D. B. A.
AU  - Nusbaumer, J.
AU  - Li, H.
AU  - Collins, O.
AU  - Vettoretti, G.
AU  - Noone, D.
PY  - 2017
TI  - Congo Basin precipitation: Assessing seasonality, regional interactions, and sources of moisture
JA  - J. Geophys. Res. Atmos.
JO  - Journal of Geophysical Research: Atmospheres
VL  - 122
IS  - 13
SP  - 6882
EP  - 6898
DO  - 10.1002/2016JD026240
ER  -

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