The seasonal evolution of the atmospheric circulation over West Africa and equatorial Africa

Journal of Climate

Volumn 16, Issue 7, 2003, Pages 1013-1030

  Nicholson, Sharon E ^a   Grist, Jeremy P ^a  

^a FLORIDA STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ATMOSPHERIC CHEMISTRY; RAIN;

ATMOSPHERIC CIRCULATION;

CLIMATOLOGY;

ATMOSPHERIC CIRCULATION; JET STREAM; RAINFALL; SEASONAL VARIATION; ZONAL WIND;

AFRICA;

EID: 0141593897     PISSN: 08948755     EISSN: None     Source Type: Journal    
DOI: 10.1175/1520-0442(2003)016<1013:TSEOTA>2.0.CO;2     Document Type: Article

References (68)

1. Albignat, J. P., and R. J. Reed, 1980: The origin of African wave disturbances during Phase III of GATE. Mon. Wea. Rev., 108, 1827-1839.
2. Ba, M. B., R. Frouin, and S. E. Nicholson. 1995: Satellite-derived interannual variability of West African rainfall during 1983-88. J. Appl. Meteor., 34, 411-431.
3. Bolton, D., 1981: Generation and propagation of African squall lines. Ph.D. Thesis, Imperial College, London, 265 pp.
4. Bolton, D., 1984: Generation and propagation of African squall lines. Quart. J. Roy. Meteor. Soc., 110, 695-721.
5. Bond, H. G., 1953: Easterly jet streams over Darwin. Weather, 8, 252-253.
6. Bounoua, L., 1980: Relation entre champ de vent, genese et progations des lignes de grains ouest Africaines. Ph.D. thesis, Institute Hydrometeorologique de Formation et de Recherches. 108 pp. [Available from IHFR BP 7019, Seddikia. Oran. Algeria.]
7. Burpee, R. W., 1972: The origin and structure of easterly waves in the lower troposphere. J. Atmos. Sci., 29, 77-90.
8. Burpee, R. W., 1972: Characteristics of North Africa easterly waves during the summers of 1968 and 1969. J. Atmos. Sci., 31, 1556-1570.
9. Chen, Y., and Y. Ogura, 1982: Modulation of convective activity by large-scale flow patterns observed in GATE. J. Atmos. Sci., 39, 1260-1279.
10. Citeau, J., L. Finaud, J. P. Cammas, and H. Demarcq. 1989: Questions relative to ITCZ migrations over tropical Atlantic ocean, sea surface temperature and Senegal river runoff. Meteor. Atmos. Phys., 41, 181-190.
11. CLIVAR, 2000: CLIVAR Africa Implementation Plan. WCRP Informal Report 5/2000, ICPO Publ. Ser. 35, Int. CLIVAR Project Office, Southampton Oceanography Centre, Southampton, United Kingdom, 33 pp.
12. Davies, D. A., and H. W. Sansom, 1952: Easterly jets over East Africa. Weather, 8, 343-345.
13. Druyan, L. M., 1998: The role of synoptic systems in the interannual variability of Sahel Rainfall. Meteor. Atmos. Phys., 65, 55-75.
14. Druyan, L. M., and T. M. Hall, 1996: The sensivity of African wave disturbances to remote forcing. J. Appl. Meteor., 35, 1100-1110.
15. Duvel, J. P., 1990: Convection over tropical Africa and the Atlantic Ocean during northern summer. Part II: Modulation by easterly waves. Mon. Wea. Rev., 118, 1855-1868.
16. Fontaine, B., S. Janicot, and V. Moron, 1995: Rainfall anomaly patterns and wind field signals over West Africa in August (1958-1989). J. Climate, 8, 1503-5101.
17. Grist, J. P., 2002: Easterly waves over Africa. Part I: The seasonal cycle and contrasts between wet and dry years. Mon. Wea. Rev., 130, 197-211.
18. Grist, J. P., and S. E. Nicholson, 2001: A study of the dynamic factors influencing the variability of rainfall in the West African Sahel. J. Climate. 14, 1337-1359.
19. Hastenrath, S., 1988: Climate and Circulation in the Tropics. D. Reidel. 455 pp.
20. Horel, J. D., A. N. Hahmann, and J. E. Geisler, 1989: An investigation of the annual cycle of convective activity over the tropical Americas. J. Climate, 2, 1388-1403.
21. Houze, R. A., Jr., and A. K. Betts, 1981: Convection in GATE. Rev. Geophys. Space Phys., 19, 541-576.
22. Illesanmi, O. O., 1971: An empirical formulation of an ITD rainfall model for the tropics: A case study in Nigeria. J. Appl. Meteor., 10, 882-891.
23. Kalnay, E., and Coauthors, 1996: The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer. Meteor. Soc., 77, 437-471.
24. Kanamitsu, M., and T. N. Krishnamuri, 1978: Northern summer tropical circulations during drought and normal rainfall months. Mon. Wea. Rev., 106, 331-347.
25. Koteswaram, P., 1958: The easterly jet stream in the tropics. Tellus, 10, 43-57.
26. Kraus, E. B., 1977a: Subtropical droughts and cross-equatorial energy transport. Mon. Wea. Rev., 105, 1009-1018.
27. Kraus, E. B., 1977b: The seasonal excursion of the intertropical convergence zone. Mon. Wea. Rev., 105, 1052-1055.
28. Krishnamurti, T. N., and R. J. Pasch, 1982: Large-scale mean state. The GARP Atlantic Tropical Experiment (GATE) Monographs, GARP Publ. Ser. 25, World Meteorological Organization, 183-218.
29. Kumar, S., 1978: Interaction of Upper Westerly Waves with Intertropical Convergence Zone and Their effect on the Weather over Zambia During the Rainy Season. Government Printers, 36 pp.
30. Kwon, H. J., 1989: A reexamination of the genesis of African waves. J. Atmos. Sci., 46, 3621-3631.
31. Laing, A., and J. M. Fritsch, 1993: Mesoscale convective complexes in Africa. Mon. Wea. Rev., 121, 2254-2263.
32. Lamb, P. J., 1978: Large-scale tropical Atlantic surface circulation patterns associated with subsaharan weather anomalies. Tellus, 30, 240-251.
33. Lau, N.-C., 1984: Circulation statistics based upon FGGE level III-B analyses produced by GFDL. NOAA Data Rep. ERL GFDL-5, 427 pp.
34. Lindzen, R. S., and A. Y. Hou, 1988: Hadley circulations for zonally averaged heating centered off the equator. J. Atmos. Sci., 45, 2416-2427.
35. Mansfield, D. A., 1977: Squall lines observed in GATE. Quart. J. Roy. Meteor. Soc., 103, 569-574.
36. Mass, C., 1979: A linear primitive equation model of African wave disturbances. J. Atmos. Sci., 36, 2075-2092.
37. McCollum, J. R., A. Gruber, and M. B. Ba, 2000: Discrepancy between gauges and satellite estimates of rainfall in equatorial Africa. J. Appl. Meteor., 39, 666-679.
38. Miles, M. K., and C. F. Folland, 1974: Changes in the latitude of the climatic zones of the Northern Hemisphere. Nature, 252, 616.
39. Miller, R. L., and R. Lindzen, 1992: Organization of rainfall by an unstable jet with an application to African waves. J. Atmos. Sci., 49, 1523-1540.
40. Mohr, K. I., and E. J. Zipser, 1996: Mesoscale convective systems defined by their 85-GHz ice scattering signature: Size and intensity comparison over tropical oceans and continents. Mon. Wea. Rev., 124, 2417-2437.
41. Moran, V., and M. N. Ward, 1998: ENSO teleconnections with climate variability in the European and African sectors. Weather, 53, 287-295.
42. Newell, R. E., and J. W. Kidson, 1984: African mean wind changes between Sahelian wet and dry periods. J. Climatol., 4, 1-7.
43. Nicholson, S. E., 1980: The nature of rainfall fluctuations in sub-tropical West Africa. Mon. Wea. Rev., 108, 473-487.
44. Nicholson, S. E., 1981: Rainfall and atmospheric circulation during drought periods and wetter years in West Africa. Mon. Wea. Rev., 109, 2191-2208.
45. Nicholson, S. E., 1986: The spatial coherance of African rainfall anomalies: Interhemisphere teleconnections. J. Climate Appl. Meteor., 25, 1365-1381.
46. Nicholson, S. E., 2000: Validation of TRMM and other satellite estimates of rainfall over selected regions of Africa. Preprints, 15th Conf. on Hydrology. Long Beach, CA, Amer. Meteor. Soc., 363-366.
47. Nicholson, S. E., and D. Entekhabi, 1986: The quasi-periodic behavior of rainfall variability in Africa and its relationship to the Southern Oscillation. Arch. Meteor. Geophys. Biochim., 34A, 311-348.
48. Nicholson, S. E., and D. Entekhabi, 1987: Rainfall variability in equatorial and Southern Africa: Relationships with sea-surface temperatures along the southwestern coast of Africa. J. Climate Appl. Meteor., 26, 561-578.
49. Nicholson, S. E., B. Some, and B. Kone, 2000: An analysis on recent rainfall conditions in West Africa, including the rainy season of the 1997 ENSO year. J. Climate, 13, 2628-2640.
50. Norquist, D. C., E. E. Recker, and R. J. Reed, 1977: The energetics of African waves disturbances as observed during phase III of GATE. Mon. Wea. Rev., 105, 334-342.
51. Oort, A., 1983: Global atmospheric circulation characteristics: 1958-73. NOAA Prof. Pap. 14, 180 pp (+47 microfiches).
52. Payne, S., and M. McGarry, 1977: The relationship of satellite inferred convective activity to easterly waves over West Africa and the adjacent ocean during the phase II of GATE. Mon. Wea. Rev., 105, 413-420.
53. Reed, R., D. Norquist, and E. Recker, 1977: The structure and properties of African wave disturbances as observed during phase III of GATE. Mon. Wea. Rev., 105, 413-420.
54. Reeves, R., C. Ropelewski, and M. Hudlow, 1979: Relationships between large-scale motion and convective precipitation during GATE. Mon. Wea. Rev., 107, 1154-1168.
55. Reiter, E., 1969: Tropospheric circulation and jet streams. Climate of the Free Atmosphere, Vol. 4, D. F. Rex, Ed., World Survey of Climatology, Elsevier, 85-203.
56. Rennick, M. A., 1976: The generation of African waves. J. Atmos. Sci., 33, 1955-1969.
57. Rennick, M. A., 1981: Some sensitivity experiments with an African wave model. J. Atmos. Sci., 38, 106-113.
58. Rosenfeld, D., 1999: TRMM observed first direct evidence of smoke from forest fires inhibiting rainfall. Geophys. Res. Lett., 26, 3105-3108.
59. Rowell, D. P., and J. R. Milford, 1993: On the generation of African squall lines, J. Climate, 6, 1181-1193.
60. Rowell, D. P., C. K. Folland, K. Maskell, and M. N. Ward, 1995: Variability of summer rainfall over tropical North Africa (1906-1992): observations and modelling. Quart. J. Roy. Meteor. Soc., 121, 669-704.
61. Semazzi, F. H. M., V. Mehta, and Y.-C. Sud, 1988: An investigation of the relationship between sub-Saharan rainfall and global sea surface temperatures. Atmos.-Oceans, 26, 118-138.
62. Simmons, A. J., 1977: A note on the instability of the African easterly jet. J. Atmos. Sci., 34, 1670-1674.
63. Tanaka, M., B. C. Weare, A. R. Navato, and R. E. Newell, 1975: Recent rainfall patterns. Nature, 255, 201-203.
64. Thompson, R. M., Jr., S. W. Payne, E. E. Recker, and R. J. Reed, 1979: Structure and properties of synoptic-scale wave disturbances in the intertropical convergence zone of the eastern Atlantic. J. Atmos. Sci., 36, 53-72.
65. Thorncroft, C. D., and M. Blackburn, 1999: Maintenance of the African easterly jet. Quart. J. Roy. Meteor. Soc., 125, 763-786.
66. Tourre, Y. M., 1981: The squall line over West Africa and tropical eastern Atlantic ocean during GATE. Ph.D. dissertation, University of Virginia 147 pp. (ISBN 82-08502).
67. Ward, M. N., 1994: Tropical North African rainfall and worldwide monthly to multidecadal climate variations. Ph.D. thesis, University of Reading, United Kingdom, 313 pp.
68. Webster, P. J., 1983: Mechanisms of monsoon low-frequency variability: Surface hydrological effects. J. Atmos. Sci., 40, 2110-2124.