Simulation of the annual and diurnal cycles of rainfall over South Africa by a regional climate model

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• 作者：Benjamin Pohl ; Mathieu Rouault ; Shouraseni Sen Roy
• 关键词：Regional climate modeling ; Rainfall ; Diurnal cycle ; Annual cycle ; Atmospheric convection ; South Africa
• 刊名：Climate Dynamics
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：43
• 期：7-8
• 页码：2207-2226
• 全文大小：6,603 KB
• 参考文献：1. Betts AK (1986) A new convective adjustment scheme. Part I: observational and theoretical basis. Q J R Meteorol Soc 112:677-91
  2. Betts AK, Jakob C (2002) Evaluation of the diurnal cycle of precipitation, surface thermodynamics, and surface fluxes in the ECMWF model using LBA data. J Geophys Res 107(D20):8045. doi:10.1029/2001JD000427 CrossRef
  3. Betts AK, Miller MJ (1986) A new convective adjustment scheme. Part II: single column tests using GATE wave, BOMEX, ATEX and arctic air-mass data sets. Q J R Meteorol Soc 112:693-09
  4. Blamey RC, Reason CJC (2013) The role of mesoscale convective complexes in Southern Africa summer rainfall. J Clim 26:1654-668. doi:10.1175/JCLI-D-12-00239.1 CrossRef
  5. Boulard D, Pohl B, Crétat J, Vigaud N (2013) Downscaling large-scale climate variability using a regional climate model: the case of ENSO over Southern Africa. Clim Dyn 40:1141-168. doi:10.1007/s00382-012-1400-6 CrossRef
  6. Chen F, Dudhia J (2001a) Coupling an advanced land-surface/hydrology model with the Penn State/NCAR MM5 modeling system. Part I: model description and implementation. Mon Weather Rev 129:569-85 CrossRef
  7. Chen F, Dudhia J (2001b) Coupling an advanced land-surface/hydrology model with the Penn State/NCAR MM5 modeling system. Part II: model validation. Mon Weather Rev 129:587-04 CrossRef
  8. Cook KH (2000) The South Indian convergence zone and interannual rainfall variability over Southern Africa. J Clim 13:3789-804 CrossRef
  9. Crétat J, Pohl B (2012) How physical parameterizations can modulate internal variability in a regional climate model. J Atmos Sci 69:714-24. doi:10.1175/JAS-D-11-0109.1 CrossRef
  10. Crétat J, Macron C, Pohl B, Richard Y (2011) Quantifying internal variability in a regional climate model: a case study for Southern Africa. Clim Dyn 37:1335-356. doi:10.1007/s00382-011-1021-5 CrossRef
  11. Crétat J, Pohl B, Richard Y, Drobinski P (2012) Uncertainties in simulating regional climate of Southern Africa: sensitivity to physical parameterizations using WRF. Clim Dyn 38:613-34. doi:10.1007/s00382-011-1055-8 CrossRef
  12. D’Abreton PC, Tyson PD (1995) Divergent and non-divergent water vapour transport over southern Africa during wet and dry conditions. Meteor Atmos Phys 55:47-9 CrossRef
  13. D’Abreton PC, Lindesay JA (1993) Water vapour transport over southern Africa during wet and dry early and late summer months. Int J Climatol 13:151-70 CrossRef
  14. Dai A, Trenberth KE (2004) The diurnal cycle and its depiction in the community climate system model. J Clim 17:930-51 CrossRef
  15. Dai A, Giorgi F, Trenberth KE (1999) Observed and model-simulated diurnal cycles of precipitation over the contiguous United States. J Geophys Res 104(D6):6377-402 CrossRef
  16. Dee DP, Uppala SM, Simmons AJ, Berrisford P, Poli P, Kobayashi S, Andrae U, Balmaseda MA, Balsamo G, Bauer P, Bechtold P, Beljaars ACM, van de Berg L, Bidlot J, Bormann N, Delsol C, Dragani R, Fuentes M, Geer AJ, Haimberger L, Healy SB, Hersbach H, Holm EV, Isaksen L, Kallberg P, Kohler M, Matricardi M, McNally AP, Monge-Sanz BM, Morcrette J-J, Park B-K, Peubey C, de Rosnay P, Tavolato C, Thepaut J-N, Vitart F (2011) The ERA-Interim reanalysis: configuration and performance of the data assimilation system. Q J R Meteorol Soc 137:553-97. doi:10.1002/qj.828 CrossRef
  17. Dudhia J (1989) Numerical study of convection observed during the winter experiment using a mesoscale two-dimensional model. J Atmos Sci 46:3077-107 CrossRef
  18. Engelbrecht FA, de Rautenbach CJW, McGregor JL, Katzfey JJ (2002) January and July climate simulations over the SADC region using the limited area model DARLAM. Water SA 28:361-73 CrossRef
  19. Evans JP, Westra S (2012) Investigating the mechanisms of diurnal rainfall variability using a regional climate model. J Clim 25:7232-247. doi:10.1175/JCLI-D-11-00616.1 CrossRef
  20. Grell GA (1993) Prognostic evaluation of assumptions used by cumulus parameterizations. Mon Weather Rev 121:764-87 CrossRef
  21. Grell GA, Dévényi D (2002) A generalized approach to parameterizing convection combining ensemble and data assimilation techniques. Geophys Res Lett. doi:10.1029/2002GL015311
  22. Hernandez-Diaz L, Laprise R, Sushama L, Martynov A, Winger K, Digas B (2013) Climate simulation over CORDEX Africa domain using the fifth-generation Canadian regional climate model (CRCM5). Climate Dyn 40:1415-433. doi:10.1007/s00382-012-1387-z CrossRef
  23. Hong SY, Lim J-OJ (2006) The WRF single-moment 6-Class microphysics scheme (WSM6). J Kor Meteorol Soc 42:129-51
  24. Hong SY, Noh Y, Dudhia J (2006) A new vertical diffusion package with an explicit treatment of entrainment processes. Mon Weather Rev 134:2318-341 CrossRef
  25. Huffman GJ, Adler RF, Morrissey M, Bolvin DT, Curtis S, Joyce R, McGavock B, Susskind J (2001) Global precipitation at one-degree daily resolution from multi-satellite observations. J Hydrometeor 2:36-0 CrossRef
  26. Janjic ZI (1994) The step-mountain eta coordinate model: further developments of the convection, viscous sublayer, and turbulence closure schemes. Mon Weather Rev 122:927-45 CrossRef
  27. Joubert AM, Katzfey JJ, McGregor JL, Ngunyen KC (1999) Simulating midsummer climate over southern Africa using a nested regional climate model. J Geophys Res 104:19015-9025 CrossRef
  28. Kain JS (2004) The Kain–Fritsch convective parameterization: an update. J Appl Meteor 43:170-81 CrossRef
  29. Kgatuke MM, Landman WA, Beraki A, Mbedzi MP (2008) The internal variability of the RegCM3 over South Africa. Int J Climatol 28:505-20 CrossRef
  30. Leduc M, Laprise R (2009) Regional climate model sensitivity to domain size. Clim Dyn 32:833-54. doi:10.1007/s00382-008-0400-z CrossRef
  31. Ma LM, Tan ZM (2009) Improving the behavior of the cumulus parameterization for tropical cyclone prediction: convection trigger. Atmos Res 92:190-11. doi:10.1016/j.atmosres.2008.09.022 CrossRef
  32. Marsham JH, Dixon N, Garcia-Carreras L, Lister GMS, Parker DJ, Knippertz P, Birch C (2013) The role of moist convection in the West African monsoon system: Insights from continental-scale convection-permitting simulations. Geophys Res Lett 40. doi:10.1002/grl.50347
  33. Mason SJ, Jury MR (1997) Climatic variability and change over southern Africa: a reflection on underlying processes. Prog Phys Geogr 21:23-0 CrossRef
  34. Mlawer E, Taubman S, Brown P, Iacono M, Clough S (1997) Radiative transfer for inhomogeneous atmosphere: RRTM, a validated correlated-k model for the long-wave. J Geophys Res 102:16663-6682 CrossRef
  35. Nikulin G, Jones C, Giorgi F, Asrar G, Büchner M, Cerezo-Mota R, Christensen BO, Déqué M, Fernandez J, H?nsler A, Van Meijgaard E, Samuelsson P, Bamba Sylla M, Sushama L (2012) Precipitation climatology in an ensemble of CORDEX-Africa regional climate simulations. J Clim 25:6057-078. doi:10.1175/JCLI-D-11-00375.1 CrossRef
  36. Philippon N, Rouault M, Richard Y, Favre A (2012) The influence of ENSO on winter rainfall in South Africa. Int J Climatol 32:2333-347. doi:10.1002/joc.3403 CrossRef
  37. Pohl B, Crétat J, Camberlin P (2011) Testing WRF capability in simulating the atmospheric water cycle over Equatorial East Africa. Clim Dyn 37:1357-379. doi:10.1007/s00382-011-1024-2
  38. Ratna SB, Ratnam JV, Behera SK, Rautenbach CJ, Ndarana T, Takahashi K, Yamagata T (2013) Performance assessment of three convective parameterization schemes in WRF for downscaling summer rainfall over South Africa. Clim Dyn (on line). doi:10.1007/s00382-013-1918-2
  39. Ratnam JV, Behera SK, Masumoto Y, Takahashi K, Yamagata T (2012) A simple regional coupled model experiment for summer-time climate simulation over southern Africa. Clim Dyn 39:2207-217. doi:10.1007/s00382-011-1190-2 CrossRef
  40. Reason CJC, Jagadheesha D (2005) A model investigation of recent ENSO impacts over southern Africa. Meteorol Atm Phys 89:181-05 CrossRef
  41. Rouault M, Richard Y (2003) Intensity and spatial extension of drought in South Africa at different time scales. Water SA 29:489-00
  42. Rouault M, White SA, Reason CJC, Lutjeharms JRE, Jobbard I (2002) Ocean-atmosphere interaction in the Agulhas Current region and a South African extreme weather event. Weather Forecast 17:655-69. doi:10.1175/1520-0434(2002)017<0655:OAIITA>2.0.CO;2 CrossRef
  43. Rouault M, Reason CJC, Lutjeharms JRE (2003) Underestimation of latent and sensible heat fluxes above the Agulhas Current in NCEP and ECMWF analyses. J Clim 16:776-82. doi:10.1175/1520-0442(2003)016<0776:UOLASH>2.0.CO;2 CrossRef
  44. Rouault M, Sen Roy S, Balling RC Jr (2013) The diurnal cycle of rainfall in South Africa in the austral summer. Int J Climatol 33:770-77. doi:10.1002/joc.3451 CrossRef
  45. Simmons A, Uppala S, Dee D, Kobayashi S (2007) ERA-interim: new ECMWF reanalysis products from 1989 onwards. ECMWF Newslett 110:25-5
  46. Skamarock WC, Klemp JB, Dudhia J, Gill DO, Barker DM, Duda M, Huang XY, Wang W, Powers JG (2008) A description of the advanced research WRF version 3. NCAR technical note, NCAR/TN\u2013475?STR, 123?pp
  47. Tadross M, Gutowski W Jr, Hewitson B, Jack C, New M (2006) MM5 simulations of interannual change and the diurnal cycle of Southern African regional climate. Theor Appl Climatol 86:63-0 CrossRef
  48. Tyson PD, Preston-White RA (2000) The weather and climate of Southern Africa. Oxford University Press, Southern Africa, ISBN:9780195718065, 396?pp
  49. Vigaud N, Pohl B, Crétat J (2012) Tropical-temperate interactions over southern Africa simulated by a regional climate model. Clim Dyn 39:2895-916. doi:10.1007/s00382-012-1314-3 CrossRef
  50. Williams C, Kniveton D, Layberry R (2010) Assessment of a climate model to reproduce rainfall variability and extremes over Southern Africa. Theor Appl Climatol 99:9-7 CrossRef
  
• 作者单位：Benjamin Pohl (1)
  Mathieu Rouault (2) (3)
  Shouraseni Sen Roy (4)
  
  1. Centre de Recherches de Climatologie, UMR6282 Biogéosciences, CNRS/University of Burgundy, 6 Boulevard Gabriel, 21000, Dijon, France
  2. Department of Oceanography, Mare Institute, University of Cape Town, Cape Town, South Africa
  3. Nansen-Tutu Center for Marine Environmental Research, University of Cape Town, Cape Town, South Africa
  4. Department of Geography and Regional Studies, University of Miami, Coral Gables, FL, 33124, USA
  
• ISSN：1432-0894

文摘

The capability of a current state-of-the-art regional climate model for simulating the diurnal and annual cycles of rainfall over a complex subtropical region is documented here. Hourly rainfall is simulated over Southern Africa for 1998-006 by the non-hydrostatic model weather research and forecasting (WRF), and compared to a network of 103 stations covering South Africa. We used five simulations, four of which consist of different parameterizations for atmospheric convection at a 0.5?×?0.5° resolution, performed to test the physic-dependency of the results. The fifth experiment uses explicit convection over tropical South Africa at a 1/30° resolution. WRF simulates realistic mean rainfall fields, albeit wet biases over tropical Africa. The model mean biases are strongly modulated by the convective scheme used for the simulations. The annual cycle of rainfall is well simulated over South Africa, mostly influenced by tropical summer rainfall except in the Western Cape region experiencing winter rainfall. The diurnal cycle shows a timing bias, with atmospheric convection occurring too early in the afternoon, and causing too abundant rainfall. This result, particularly true in summer over the northeastern part of the country, is weakly physic-dependent. Cloud-resolving simulations do not clearly reduce the diurnal cycle biases. In the end, the rainfall overestimations appear to be mostly imputable to the afternoon hours of the austral summer rainy season, i.e., the periods during which convective activity is intense over the region.