A simple model of coupled synoptic waves in the land surface and atmosphere of the northern Sahel

Quarterly Journal of the Royal Meteorological Society

Volumn 134, Issue 637, 2008, Pages 2173-2184

  Parker, Douglas J ^a  

^a UNIVERSITY OF LEEDS   (United Kingdom)

Author keywords

African easterly wave; Intraseasonal variability; Rossby wave

Indexed keywords

AERODYNAMICS; ATMOSPHERIC THERMODYNAMICS; ATMOSPHERICS; BOUNDARY LAYERS; CLIMATE CHANGE; GEOLOGIC MODELS; GROUNDWATER; HYDRODYNAMICS; LINEAR SYSTEMS; MOISTURE; MOISTURE DETERMINATION; OCEAN CURRENTS; PERMITTIVITY; SOIL MOISTURE; SOILS; SURFACE MEASUREMENT; SURFACE PROPERTIES; TROPOSPHERE; WEATHER FORECASTING;

AFRICAN EASTERLY WAVE; ATMOSPHERIC BOUNDARY LAYERS; ATMOSPHERIC DISTURBANCES; ATMOSPHERIC PATTERNS; CLOUD PROCESSES; EQUILIBRIUM STATES; GEOSTROPHIC DYNAMICS; INTRASEASONAL VARIABILITY; LAND SURFACES; MODAL SOLUTIONS; OPTIMAL EXCITATIONS; ROSSBY WAVE; SIMPLE LINEAR RELATIONSHIPS; SIMPLE MODELS; SOLAR FLUXES; SURFACE TEMPERATURES; UNSTABLE MODES; WAVE NUMBERS; WEATHER PREDICTIONS; WET SURFACES;

ATMOSPHERIC TEMPERATURE;

AIR TEMPERATURE; ATMOSPHERIC DYNAMICS; BOUNDARY LAYER; CONVECTION; EASTERLY WAVE; LAND SURFACE; QUASI-GEOSTROPHIC FLOW; ROSSBY WAVE; SEASONAL VARIATION; SOIL MOISTURE; SOLAR RADIATION; SURFACE TEMPERATURE; SYNOPTIC METEOROLOGY; WEATHER FORECASTING;

AFRICA; SAHEL [SUB-SAHARAN AFRICA]; SUB-SAHARAN AFRICA;

EID: 58049209833     PISSN: 00359009     EISSN: None     Source Type: Journal    
DOI: 10.1002/qj.343     Document Type: Article

References (48)

1. Berry GJ, Thorncroft CD. 2005. Case study of an intense African easterly wave. Mon. Weather Rev. 133: 752-766.
2. Bretherton FP. 1966. Critical layer instability in baroclinic flows. Q. J. R. Meteorol. Soc. 92: 325-334.
3. Burpee RW. 1972. The origin and structure of easterly waves in the lower troposphere of North Africa. J. Atmos. Sci. 29: 77-90.
4. Castelli F, Rodriguez-Iturbe I. 1995. Soil moisture atmosphere interaction in a moist semigeostrophic model of baroclinic instability. J. Atmos. Sci. 52: 2152-2159.
5. Charney JG, Stern ME. 1962. On the stability of internal baroclinic jets in a rotating atmosphere. J. Atmos. Sci. 19: 159-172.
6. Cook KH. 1999. Generation of the African easterly jet and its role in determining West African precipitation. J. Climate. 12: 1165-1184.
7. Craig GC, Cho H-R. 1988. Cumulus heating and CISK in the extratropical atmosphere. Part I: Polar lows and comma clouds. J. Atmos. Sci. 45: 2622-2640.
8. Diongue A, Lafore J-P, Redelsperger J-L, Roca R. 2002. Numerical study of a Sahelian synoptic weather system: Initiation and mature stages of convection and its interactions with the large-scale dynamics. Q. J. R. Meteorol. Soc. 128: 1899-1928.
9. Duvel JP. 1990. Convection over tropical Africa and the Atlantic Ocean during northern summer. 2: Modulation by easterly waves. Mon. Weather Rev. 118: 1855-1868.
10. Farrell BF, Moore AM. 1992. An adjoint method for obtaining the most rapidly growing perturbation to oceanic flows. J. Phys. Oceanogr. 22: 338-349.
11. Gill AE. 1982. Atmosphere-Ocean Dynamics. Academic Press: New York
12. Hamilton RA, Archbold JW. 1945. Meteorology of Nigeria and adjacent territory. Q. J. R. Meteorol. Soc. 71: 231-264.
13. Hoskins BJ, McIntyre ME, Robertson RW. 1985. On the use and significance of isentropic potential vorticity maps. Q. J. R. Meteorol. Soc. 111: 877-946.
14. Janicot S, Sultan B. 2001. Intra-seasonal modulation of convection in the West African monsoon. Geophys. Res. Lett. 28: 523-526.
15. Karyampudi VM, Carlson TN. 1988. Analysis and numerical simulations of the Saharan air layer and its effect on easterly wave disturbances. J. Atmos. Sci. 45: 3102-3136.
16. Karyampudi VM, Palm SP, Reagen JA, Fang H, Grant WB, Hoff RM, Moulin C, Pierce HF, Torres O, Browell EV, Melfi SH. 1999. Validation of the Saharan dust plume conceptual model using lidar, Meteosat and ECMWF data. Bull. Am. Meteorol. Soc. 80: 1045-1075.
17. Kwon HJ. 1989. A re-examination of the genesis of African waves. J. Atmos. Sci. 46: 3621-3631.
18. Landsea CW. 1993. A climatology of intense (or major) Atlantic hurricanes. Mon. Weather Rev. 121: 1703-1713.
19. Mathon V, Diedhiou A, Laurent H. 2002. Relationship between easterly waves and mesoscale convective systems over the Sahel. Geophys. Res. Lett. 29: 1216. DOI: 10.1029/2001GL014371.
20. Parker DJ, Thorpe AJ. 1995. Conditional convective heating in a baroclinic atmosphere: a model of convective frontogenesis. J. Atmos. Sci. 52: 1699-1711.
21. Parker DJ. 2002. The response of CAPE and CIN to tropospheric thermal variations. Q. J. R. Meteorol. Soc. 128: 119-130.
22. Parker DJ, Burton RR. 2002. The two-dimensional response of a tropical jet to propagating lines of convection. J. Atmos. Sci. 59: 1263-1273.
23. Parker DJ, Thorncroft CD, Burton RR, Diongue-Niang A. 2005a. Analysis of the African easterly jet, using aircraft observations from the JET2000 experiment. Q. J. R. Meteorol. Soc. 131: 1461-1482.
24. Parker DJ, Burton RR, Diongue-Niang A, Ellis RJ, Felton M, Taylor CM, Thorncroft CD, Bessemoulin P, Tompkins AM. 2005b. The diurnal cycle of the west African monsoon circulation. Q. J. R. Meteorol. Soc. 131: 2839-2860.
25. Pedlosky J. 1979. Geophysical Fluid Dynamics. Springer-Verlag: Berlin.
26. Peyrillé P, Lafore J-P. 2007. An idealized two-dimensional framework to study the West African monsoon. Part II: Large-scale advection and the diurnal cycle. J. Atmos. Sci. 64: 2783-2803.
27. Pytharoulis I, Thorncroft CD. 1999. The low-level structure of African easterly waves in 1995. Mon. Weather Rev. 127: 2266-2280.
28. Rácz Zs, Smith RK. 1999. The dynamics of heat lows. Q. J. R. Meteorol. Soc. 125: 225-252.
29. Redelsperger J-L, Diongue A, Diedhiou A, Ceron J-P, Diop M, Gueremy J-F, Lafore J-P. 2002. Multi-scale description of a Sahelian synoptic weather system representative of the West African monsoon. Q. J. R. Meteorol. Soc. 128: 1229-1257.
30. Redelsperger J-L, Thorncroft CD, Diedhiou A, Lebel T, Parker DJ, Polcher J. 2006. African Monsoon Multidisciplinary Analysis: An international research project and field campaign. Bull. Am. Meteorol. Soc. 87: 1739-1746.
31. Reed RJ, Norquist DC, Recker EE. 1977. The structure and properties of African wave disturbances as observed during Phase III of GATE. Mon. Weather Rev. 105: 317-333.
32. Rennick MA. 1976. The generation of African waves. J. Atmos. Sci. 33: 1955-1969.
33. Simmons AJ. 1977. A note on the instability of the African Easterly jet. J. Atmos. Sci. 34: 1670-1674.
34. Snyder C. 1991. 'A minimal model of moist baroclinic instability'. Pp. 221-224 in Proc. 8th AMS Conference on Waves and Stability, Denver, 14-18 October. Am. Meteorol. Soc: Boston.
35. Snyder C, Lindzen RS. 1991. Quasi-geostrophic wave-CISK in an unbounded baroclinic shear. J. Atmos. Sci. 48: 78-86.
36. Sultan B, Janicot S. 2003. The West African monsoon dynamics. Part II: The 'Pre-onset' and 'Onset' of the summer monsoon. J. Climate 16: 3407-3427.
37. Tansley CE, James IN. 1999. Feedbacks between sea ice and baroclinic waves using a linear quasi-geostrophic model. Q. J. R. Meteorol. Soc. 125: 2517-2534.
38. Taylor CM. 2008. Intraseasonal land-atmosphere coupling in the West African Monsoon. J. Climate in press.
39. Taylor CM, Clark DB. 2001. The diurnal cycle and African easterly waves: A land surface perspective. Q. J. R. Meteorol. Soc. 127: 845-867.
40. Taylor CM, Parker DJ, Lloyd CR, Thorncroft CD. 2005. Observations of synoptic-scale land surface variability and its coupling with the atmosphere. Q. J. R. Meteorol. Soc. 131: 913-938.
41. Thorncroft CD, Blackburn M. 1999. Maintenance of the African easterly jet. Q. J. R. Meteorol. Soc. 125: 763-786.
42. Thorncroft CD, Haile M. 1995. The mean dynamic and thermodynamic fields for July 1989 over tropical North Africa and their relationship to convective storm activity. Mon. Weather Rev. 123: 3016-3031.
43. Thorncroft CD, Hoskins BJ. 1990. Frontal cyclogenesis. J. Atmos. Sci. 47: 2317-2336.
44. Thorncroft CD, Hoskins BJ. 1994a. An idealized study of African easterly waves. I: A linear view. Q. J. R. Meteorol. Soc. 120: 953-982.
45. Thorncroft CD, Hoskins BJ. 1994b. An idealised study of African easterly waves. II: A nonlinear view. Q. J. R. Meteorol. Soc. 120: 983-1015.
46. Thorncroft CD, Hall NMJ, Kiladis GN. 2008. Three-dimensional structure and dynamics of African easterly waves. Part III: Genesis. J. Atmos. Sci. in press.
47. Wallace JS, Holwill CJ. 1997. Soil evaporation from tiger bush in south west Niger. J. Hydrol. 189: 426-442.
48. Williams E, Renno N. 1993. An analysis of the conditional instability of the tropical atmosphere. Mon. Weather Rev. 121: 21-36.