Generation of the African easterly jet and its role in determining West African precipitation

Journal of Climate

Volumn 12, Issue 5 I, 1999, Pages 1165-1184

  Cook, Kerry H ^a  

^a Department of Obstetrics Gynecology   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ATMOSPHERIC RADIATION; ATMOSPHERIC TEMPERATURE; CLIMATE CHANGE; CLIMATOLOGY; CLOUDS; COMPUTER SIMULATION; MOISTURE; SOILS; THERMAL GRADIENTS; TROPOSPHERE;

GEOSTROPHIC ZONAL FLOW; MERIDIONAL SOIL MOISTURE GRADIENT; MERIDIONAL TEMPERATURE GRADIENT; SEA SURFACE TEMPERATURE;

PRECIPITATION (METEOROLOGY);

JET; PRECIPITATION (CLIMATOLOGY); SOIL MOISTURE; ZONAL WIND;

AFRICA;

EID: 0032835032     PISSN: 08948755     EISSN: None     Source Type: Journal    
DOI: 10.1175/1520-0442(1999)012<1165:GOTAEJ>2.0.CO;2     Document Type: Article

References (33)

1. Blackburn, M., 1985: Interpretation of ageostrophic winds and implications for jet stream maintenance. J. Atmos. Sci., 42, 2604-2620.
2. Burpee, R. W., 1972: The origin and structure of easterly waves in the lower troposphere of North Africa. J. Atmos. Sci., 29, 77-90.
3. Chang, C. B., 1982: On the influences of solar radiation on the low-level circulation over North Africa. J. Meteor. Soc. Japan, 60, 850-864.
4. Chen, Y.-L., and Y. Ogura, 1982: Modulation of convective activity by large-scale flow patterns observed in GATE. J. Atmos. Sci., 39, 1260-1279.
5. Cook, K. H., 1994: Mechanisms by which surface drying perturbs tropical precipitation fields. J. Climate, 7, 400-413.
6. _, 1995: Understanding perturbations of the intertropical convergence zone over tropical continents. Global Precipitation and Climate Change, M. Desbois and F. Desalmund, Eds., NATO ASI Series I: Global Environmental Change, Vol. 26.
7. _, 1997: Large-scale atmospheric dynamics and Sahelian precipitation. J. Climate, 10, 1137-1152.
8. Cunnington, W. M., and P. R. Rowntree, 1986: Simulations of the Saharan atmosphere - Dependence on moisture and albedo. Quart. J. Roy. Meteor. Soc., 112, 971-999.
9. Druyan, L. M., 1989: Advances in the study of sub-Saharan drought. Int. J. Climatol., 9, 77-90.
10. Folland, C. K., T. N. Palmer, and D. E. Parker, 1986: Sahel rainfall and worldwide sea temperatures. Nature, 320, 602-607.
11. Fontaine, B., and S. Janicott, 1992: Wind-field coherence and its variations over West Africa. J. Climate, 5, 512-524.
12. Frank, N. L., 1970: Atlantic tropical systems of 1969. Mon. Wea. Rev., 98, 307-314.
13. Kalnay, E., and Coauthors, 1996: The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer. Meteor. Soc., 77, 437-471.
14. Karyampudi, V. M., and T. N. Carlson, 1988: Analysis and numerical simulations of the Saharan air layer and its effect on easterly wave disturbances. J. Atmos. Sci., 45, 3103-3136.
15. Koteswaram, P., 1958: The easterly jet stream in the tropics. Tellus, 10, 43-57.
16. Krishnamurti, T. N., H. L. Pan, C.-B. Chang, J. Ploshay, D. Walker, and A. W. Oodally, 1979: Numerical weather prediction for GATE. Quart. J. Roy. Meteor. Soc., 105, 979-1010.
17. Manabe, S., 1969: Climate and ocean circulation: The atmospheric circulation and the hydrology of the earth's surface. Mon. Wea. Rev., 97, 739-744.
18. Mintz, Y., and G. K. Walker, 1993: Global fields of soil moisture and land surface evapotranspiration derived from observed precipitation and surface air temperature. J. Appl. Meteor., 32, 1305-1334.
19. Payne, S. W., and M. M. McGarry, 1977: The relationship of satellite inferred convective activity to easterly waves over west Africa and the adjacent ocean during phase III of GATE. Mon. Wea. Rev., 105, 413-420.
20. Reed, R. J., A. Hollingsworth, W. A. Heckley, and F. Delsol, 1988: An evaluation of the performance of the ECMWF operational system in analyzing and forecasting easterly wave disturbances over Africa and the tropical Atlantic. Mon. Wea. Rev, 116, 824-865.
21. Rennick, M. A., 1976: The generation of African waves. J. Atmos. Sci., 33, 1955-1969.
22. Rowell, D. P., and J. R. Milford, 1993: On the generation of African squall lines. J. Climate, 6, 1181-1193.
23. _, C. K. Folland, K. Maskell, J. A. Owen, and M. N. Ward, 1992: Modelling the influence of global sea surface temperatures on the variability and predictability of seasonal Sahel rainfall. Geophys. Res. Lett., 19, 905-908.
24. _, and M. N. Ward, 1995: Variability of summer rainfall over tropical North Africa (1906-92): Observations and Modelling. Quart. J. Roy. Meteor. Soc., 121, 669-704.
25. Schubert, W. H., P. E. Ciesielski, D. E. Stevens, and H.-C. Kuo, 1991: Potential vorticity modeling of the ITCZ and the Hadley circulation. J. Atmos. Sci., 48, 1493-1509.
26. Shea, D. J., K. E. Trenberth, and R. W. Reynolds, 1990: A global monthly sea surface temperature climatology. NCAR Tech. Note NCAR/TN-345+STR. [Available from NCAR, P.O. Box 3000, Boulder, CO 80307-3000.]
27. Smith, E. A., M. M.-K. Wai, H. J. Cooper, and M. T. Rubes, 1994: Linking boundary-layer circulations and surface processes during FIFE 89. Part I: Observational analysis. J. Atmos. Sci., 51, 1497-1529.
28. Thorncroft, C. D., and B. J. Hoskins, 1994a: An idealized study of African easterly waves. I: A linear view. Quart. J. Roy. Meteor. Soc., 120, 953-982.
29. _, and _, 1994b: An idealized study of African easterly waves. I: A nonlinear view. Quart. J. Roy. Meteor. Soc., 120, 983-1015.
30. Trenberth, K. E., 1992: Global analyses from ECMWF and atlas of 1000 to 10 mb circulation statistics. NCAR Tech. Note NCAR/ TN-373+STR. [Available from NCAR, P.O. Box 3000, Boulder, CO 80307.]
31. Wai, M. M.-K., E. A. Smith, P. Bessemoulin, A. D. Culf, A. J. Dolman, and T. Lebel, 1997: Variability in boundary layer structure during HAPEX-Sahel wet-dry season transition. J. Hydrol., 188, 965-997.
32. Walker, J., and P. R. Rowntree, 1977: The effect of soil moisture on circulation and rainfall in a tropical model. Quart. J. Roy. Meteor. Soc., 103, 29-46.
33. Washington, W. M., and C. L. Parkinson, 1983: Introduction to Three-Dimensional Climate Modeling. University Science Books, 422 pp.