Climate Dynamics

, Volume 38, Issue 9–10, pp 1849–1865 | Cite as

Examining evapotranspiration trends in Africa

  • Michael Marshall
  • Christopher Funk
  • Joel Michaelsen
Article

Abstract

Surface temperatures are projected to increase 3–4°C over much of Africa by the end of the 21st century. Precipitation projections are less certain, but the most plausible scenario given by the Intergovernmental Panel on Climate Change (IPCC) is that the Sahel and East Africa will experience modest increases (~5%) in precipitation by the end of the 21st century. Evapotranspiration (Ea) is an important component of the water, energy, and biogeochemical cycles that impact several climate properties, processes, and feedbacks. The interaction of Ea with climate change drivers remains relatively unexplored in Africa. In this paper, we examine the trends in Ea, precipitation (P), daily maximum temperature (Tmax), and daily minimum temperature (Tmin) on a seasonal basis using a 31 year time series of variable infiltration capacity (VIC) land surface model (LSM) Ea. The VIC model captured the magnitude, variability, and structure of observed runoff better than other LSMs and a hybrid model included in the analysis. In addition, we examine the inter-correlations of Ea, P, Tmax, and Tmin to determine relationships and potential feedbacks. Unlike many IPCC climate change simulations, the historical analysis reveals substantial drying over much of the Sahel and East Africa during the primary growing season. In the western Sahel, large increases in daily maximum temperature appear linked to Ea declines, despite modest rainfall recovery. The decline in Ea and latent heating in this region could lead to increased sensible heating and surface temperature, thus establishing a possible positive feedback between Ea and surface temperature.

Keywords

Evapotranspiration Climate change Land surface models VIC Africa 

References

  1. Allen CD et al (2010) A global overview of drought and heat-induced tree mortality reveals emerging climate change risks for forests. For Ecol Manag 259:660–684CrossRefGoogle Scholar
  2. Anyamba A, Eastman JR (1996) Interannual variability of NDVI over Africa and its relation to El Nino/Southern Oscillation. Int J Remote Sens 17:2533–2548CrossRefGoogle Scholar
  3. Berg AA et al (2003) Impact of bias correction to reanalysis products on simulations of North American soil moisture and hydrological fluxes. J Geophys Res 108:4490CrossRefGoogle Scholar
  4. Betts AK et al (1997) Assessment of the land surface and boundary layer models in two operational versions of the NCEP Eta model using FIFE data. Mon Weather Rev 125:2896–2916CrossRefGoogle Scholar
  5. Biasutti M et al (2008) SST forcings and Sahel rainfall variability in simulations of the twentieth and twenty-first centuries. J Clim 21:3471–3486CrossRefGoogle Scholar
  6. Bonan GB (1996) A land surface model (LSM version 1.0) for ecological, hydrological, and atmospheric studies: technical description and user’s guide. NCAR, Boulder, COGoogle Scholar
  7. Bonan GB (1998) The land surface climatology of the NCAR land surface model coupled to the NCAR community climate model. J Clim 11:1307–1326CrossRefGoogle Scholar
  8. Bontemps S et al (2010) GlobCover 2009: products description and validation report. Université catholique de Louvain, Louvain-la-Neuve, BelgiumGoogle Scholar
  9. Boone A (2011) Land cover influences on temperature, precipitation, and evapotranspiration in the Sahel. In: Marshall M (ed) (personal communication), Santa Barbara, CAGoogle Scholar
  10. Brown ME, de Beurs KM (2008) Evaluation of multi-sensor semi-arid crop season parameters based on NDVI and rainfall. Remote Sens Environ 112:2261–2271CrossRefGoogle Scholar
  11. Brown ME, Funk C (2008) Food security under climate change. Science 319:580–581CrossRefGoogle Scholar
  12. Buckley TN (2005) The control of stomata by water balance. New Phytol 168:275–292Google Scholar
  13. Camberlin P et al (2007) Determinants of the interannual relationships between remote sensed photosynthetic activity and rainfall in tropical Africa. Remote Sens Environ 106:199–216CrossRefGoogle Scholar
  14. Chen F et al (1996) Modeling of land surface evaporation by four schemes and comparison with FIFE observations. J Geophys Res 101:2896–2916Google Scholar
  15. Chen F et al (1997) Impact of atmospheric surface-layer parameterizations in the new land-surface scheme of the NCEP mesoscale Eta model. Boundary Layer Meteorol 85:391–421CrossRefGoogle Scholar
  16. Cherkauer KA et al (2003) Variable infiltration capacity cold land process model updates. Global Planet Change 38:151–159CrossRefGoogle Scholar
  17. Chiang JCH, Vimont DJ (2004) Analogous Pacific and Atlantic Meridional Modes of tropical atmosphere-ocean variability. J Clim 17:4143–4158CrossRefGoogle Scholar
  18. Christensen JH et al (2007) Regional climate projections. In: Solomon S et al (eds) Climate change 2007: the physical science basis/contribution of working group I to the fourth assessment report of the intergovernmental panel on climate change. Cambridge University Press, Cambridge, New York, NY, pp 847–940Google Scholar
  19. Cook BI et al (2006) Soil moisture feedbacks to precipitation in Southern Africa. J Clim 19:4198–4206CrossRefGoogle Scholar
  20. Dai A (2010) Drought under global warming: a review. Wiley Interdiscip Rev Clim Change. doi:10.1002/wcc.1081
  21. Dai Y, Zeng Q (1997) A land surface model (IAP94) for climate studies part I: formulation and validation in off-line experiments. Adv Atmos Sci 14:433–460CrossRefGoogle Scholar
  22. Dai Y et al (2003) The common land model. Bull Am Meteorol Soc 84:1013–1023CrossRefGoogle Scholar
  23. De Bie S et al (1998) Woody plant phenology in the West Africa savanna. J Biogeogr 25:883–900CrossRefGoogle Scholar
  24. DehghaniSanij H et al (2004) Assessment of evapotranspiration estimation models for use in semi-arid environments. Agric Water Manage 64:91–106CrossRefGoogle Scholar
  25. Derber JC et al (1991) The new global operational analysis system at the national meteorological center. Weather Forecast 6:538–547CrossRefGoogle Scholar
  26. Dickenson RE et al (1986) Biosphere-atmosphere transfer scheme (BATS) for the NCAR community climate model. National Center for Atmospheric Research, BoulderGoogle Scholar
  27. Dickinson RE et al (2006) The community land model and its climate statistics as a component of the community climate system model. J Clim 19:2302–2324CrossRefGoogle Scholar
  28. Douville H (2002) Influence of soil moisture on the Asian and African monsoons. Part II: interannual variability. J Clim 15:701–720CrossRefGoogle Scholar
  29. Ducoudre NI et al (1993) SECHIBA, a new set of parameterizations of the hydrologic exchanges at the land-atmosphere interface within the LMD atmospheric general circulation model. J Clim 6:248–273CrossRefGoogle Scholar
  30. Ek MB et al (2003) Implementation of Noah land surface model advances in the National Centers for Environmental Prediction operational mesoscale Eta model. J Geophys Res 108:8851CrossRefGoogle Scholar
  31. FAO (2010) Global forest resources assessment 2010: main report. Rome, ItalyGoogle Scholar
  32. Fischer EM et al (2007) Soil moisture-atmosphere interactions during the 2003 European summer heat wave. J Clim 20:5081–5099CrossRefGoogle Scholar
  33. Fisher JB et al (2008) Global estimates of the land-atmosphere water flux based on monthly AVHRR and ISLSCP-II data, validated at 16 FLUXNET sites. Remote Sens Environ 112:901–919CrossRefGoogle Scholar
  34. Fisher JB et al (2009) The land-atmosphere water flux in the tropics. Glob Change Biol 15:2694–2714CrossRefGoogle Scholar
  35. Funk C, Michaelsen J, Marshall M (2011) Mapping recent decadal climate variations in Eastern Africa and the Sahel. In: Anderson M, Verdin J (eds) Remote sensing of drought: innovative monitoring approaches. Taylor and Francis, London, p 270Google Scholar
  36. Giannini A et al (2003) Oceanic forcing of sahel rainfall on interannual to interdecadal time scales. Science 302:1027–1030CrossRefGoogle Scholar
  37. Giannini A et al (2008) A climate model-based review of drought in the Sahel: desertification, the re-greening and climate change. Global Planet Change 64:119–128CrossRefGoogle Scholar
  38. Hagos SM, Cook KH (2008) Ocean warming and late-twentieth-century sahel drought and recovery. J Clim 21:3797–3814CrossRefGoogle Scholar
  39. Herrmann SM et al (2005) Recent trends in vegetation dynamics in the African Sahel and their relationship to climate. Glob Environ Change Part A 15:394–404CrossRefGoogle Scholar
  40. Heumann BW et al (2007) AVHRR derived phenological change in the Sahel and Soudan, Africa, 1982–2005. Remote Sens Environ 108:385–392CrossRefGoogle Scholar
  41. Hoerling M et al (2009) Regional precipitation trends: distinguishing natural variability from anthropogenic forcing. J Clim 23:2131–2145CrossRefGoogle Scholar
  42. Hogue TS et al (2005) Evaluation and transferability of the Noah land surface model in semiarid environments. J Hydrometeorol 6:68–84CrossRefGoogle Scholar
  43. Huntington TG (2006) Evidence for intensification of the global water cycle: review and synthesis. J Hydrol 319:83–95CrossRefGoogle Scholar
  44. Huth R, Pokorná L (2004) Parametric versus non-parametric estimates of climatic trends. Theor Appl Climatol 77:107–112CrossRefGoogle Scholar
  45. Idso SB (1981) A set of equations for full spectrum and 8- to 14 micrometer and 10.5- to 12.5 micrometer thermal radiation from cloudless skies. Water Resour Res 17:295–304CrossRefGoogle Scholar
  46. Jacquemin B, Noilhan J (1990) Sensitivity study and validation of a land surface parameterization using the HAPEX-MOBILHY data set. Boundary Layer Meteorol 52:93–134CrossRefGoogle Scholar
  47. Jarvis PG (1976) The interpretation of the variations in leaf water potential and stomatal conductance found in canopies in the field. Philos Trans R Soc B-Biol Sci 273:593–610CrossRefGoogle Scholar
  48. Jung M et al (2010) Recent decline in the global land evapotranspiration trend due to limited moisture supply. Nature 467:951–954Google Scholar
  49. Koren V et al (1999) A parameterization of snowpack and frozen ground intended for NCEP weather and climate models. J Geophys Res 104:19569–19585CrossRefGoogle Scholar
  50. Koster RD et al (2004) Regions of strong coupling between soil moisture and precipitation. Science 305:1138–1140CrossRefGoogle Scholar
  51. Koster RD et al (2006) GLACE: the global land-atmosphere coupling experiment. Part I: overview. J Hydrometeorol 7:590–610CrossRefGoogle Scholar
  52. Law BE et al (2002) Environmental controls over carbon dioxide and water vapor exchange of terrestrial vegetation. Agric For Meteorol 113:97–120CrossRefGoogle Scholar
  53. Lebel T, Ali A (2009) Recent trends in the Central and Western Sahel rainfall regime (1990–2007). J Hydrol 375(1–2):52–64CrossRefGoogle Scholar
  54. Lee J, Pielke RA (1992) Estimating the soil surface specific humidity. J Appl Meteorol 31:480–484CrossRefGoogle Scholar
  55. Liang X, Xie Z (2001) A new surface runoff parameterization with subgrid-scale soil heterogeneity for land surface models. Adv Water Resour 24:1173–1193CrossRefGoogle Scholar
  56. Liang X et al (1994) A simple hydrologically based model of land surface water and energy fluxes for general circulation models. J Geophys Res 99:14415–14428CrossRefGoogle Scholar
  57. Liang X et al (1996a) One-dimensional statistical dynamic representation of subgrid spatial variability of precipitation in the two-layer variable infiltration capacity model. J Geophys Res 101:21403–21422CrossRefGoogle Scholar
  58. Liang X et al (1996b) Surface soil moisture parameterization of the VIC-2L model: evaluation and modification. Global Planet Change 13:195–206CrossRefGoogle Scholar
  59. Liang X et al (1999) Modeling ground heat flux in land surface parameterization schemes. J Geophys Res 104:9581–9600CrossRefGoogle Scholar
  60. Llovel W, Becker M, Cazenave A, Cretaux JF, Ramillien G (2010) Global land water storage change from GRACE over 2002–2009; Inference on sea level. C R Geosci 342:179–188CrossRefGoogle Scholar
  61. Lobell DB, Burke MB (2010) On the use of statistical models to predict crop yield responses to climate change. Agric For Meteorol 150:1443–1452CrossRefGoogle Scholar
  62. Mahfouf JF, Noilhan J (1991) Comparative study of various formulations of evaporations from bare soil using in situ data. J Appl Meteorol 30:1354–1365CrossRefGoogle Scholar
  63. Marshall M et al (2011) Combining surface reanalysis and remote sensing data for monitoring evapotranspiration in sub-Saharan Africa. Hydrol and Earth Syst Sci (in review)Google Scholar
  64. Milly PCD, Cazenave A, Gennero MC (2003) Contribution of climate-driven change in continental water storage to recent sea-level rise. Proc Natl Acad Sci 100:13158–13161CrossRefGoogle Scholar
  65. Minobe S (2005) Year-to-year variability in the Hadley and Walker circulations from NCEP/NCAR reanalysis data. Kluwer Academic Publishers, Amsterdam, NetherlandsGoogle Scholar
  66. Morton FI (1983) Operational estimates of areal evapotranspiration and their significance to the science and practice of hydrology. J Hydrol 66:1–76CrossRefGoogle Scholar
  67. Nagol JR et al (2009) Effects of atmospheric variation on AVHRR NDVI data. Remote Sens Environ 113:392–397CrossRefGoogle Scholar
  68. Nicholson SE et al (1990) A comparison of the vegetation response to rainfall in the Sahel and East Africa, using normalized difference vegetation index from NOAA AVHRR. Clim Change 17:209–241CrossRefGoogle Scholar
  69. Nijssen B et al (2001a) Predicting the discharge of global rivers. J Clim 14:3307–3323CrossRefGoogle Scholar
  70. Nijssen B et al (2001b) Global retrospective estimation of soil moisture using the variable infiltration capacity land surface model, 1980–93. J Clim 14:1790–1808CrossRefGoogle Scholar
  71. Pedelty J et al (2007) Generating a long-term land data record from the AVHRR and MODIS instruments. Paper presented at IGARSS. IEEE international in geoscience and remote sensing symposium Google Scholar
  72. Philip JR (1957) The theory of infiltration: 4. Sorptivity and algebraic infiltration equations. Soil Sci 84:257–264Google Scholar
  73. Philippon N et al (2007) Characterization of the interannual and intraseasonal variability of West African vegetation between 1982 and 2002 by means of NOAA AVHRR NDVI data. J Clim 20:1202–1218CrossRefGoogle Scholar
  74. Qian T et al (2006) Simulation of global land surface conditions from 1948 to 2004. Part I: forcing data and evaluations. J Hydrometeorol 7:953–975CrossRefGoogle Scholar
  75. Rodell M et al (2004) The global land data assimilation system. Bull Am Meteorol Soc 85:381–394CrossRefGoogle Scholar
  76. Rosero E et al (2009) Evaluating enhanced hydrological representations in NOAH LSM over transition zones: implications for model development. J Hydrometeorol 10:600–622CrossRefGoogle Scholar
  77. Sellers PJ et al (1996a) A revised land surface parameterization (SiB2) for atmospheric GCMS. Part II: the generation of global fields of terrestrial biophysical parameters from satellite data. J Clim 9:706–737CrossRefGoogle Scholar
  78. Sellers PJ et al (1996b) A revised land surface parameterization (SiB2) for atmospheric GCMS. Part I: model formulation. J Clim 9:676–705CrossRefGoogle Scholar
  79. Shapiro R (1987) A simple model for the calculation of the flux of direct and diffuse solar radiation through the atmosphere. Air Force Geophysics Lab, Hanscom AFB, MAGoogle Scholar
  80. Taylor KE (2001) Summarizing multiple aspects of model performance in a single diagram. J Geophys Res 106:7183–7192CrossRefGoogle Scholar
  81. Tucker C et al (2005) An extended AVHRR 8 km NDVI dataset compatible with MODIS and SPOT vegetation NDVI data. Int J Remote Sens 26:4485–4498CrossRefGoogle Scholar
  82. Verdin KL, Verdin JP (1999) A topological system for delineation and codification of the Earth’s river basins. J Hydrol 218:1–12CrossRefGoogle Scholar
  83. Vrieling A et al (2011) Variability of African farming systems from phenological analysis of NDVI time series. Clim Change. doi:10.1007/s10584-011-0049-1
  84. Wang G, Eltahir EAB (2000) Ecosystem dynamics and the Sahel Drought. Geophys Res Lett 27:795–798CrossRefGoogle Scholar
  85. Wang A et al (2008) Integration of the variable infiltration capacity model soil hydrology scheme into the community land model. J Geophys Res 113:D09111CrossRefGoogle Scholar
  86. Wilks DS (1995) Statistical methods in the atmospheric sciences—an introduction. Academic Press, Inc., San Diego, CAGoogle Scholar
  87. Williams A, Funk C (2010) A westward extension of the warm pool leads to a westward extension of the Walker circulation, drying eastern Africa. Clim Dyn 37:2417–2435Google Scholar
  88. Xie P, Arkin PA (1997) Global precipitation: A 17-year monthly analysis based on gauge observations, satellite estimates, and numerical model outputs. Bull Am Meteorol Soc 78:2539–2558CrossRefGoogle Scholar
  89. Xue Y et al (2010) Intercomparison and analyses of the climatology of the West African Monsoon in the West African Monsoon modeling and evaluation project (WAMME) first model intercomparison experiment. Clim Dyn 35:3–27CrossRefGoogle Scholar
  90. Zeng N (2003) Drought in the Sahel. Science 302:999–1000CrossRefGoogle Scholar
  91. Zeng N, Neelin JD (2000) The role of vegetation-climate interaction and interannual variability in shaping the African Savanna. J Clim 13:2665–2670CrossRefGoogle Scholar
  92. Zeng N et al (1999) Enhancement of interdecadal climate variability in the Sahel by vegetation interaction. Science 286:1537–1540CrossRefGoogle Scholar
  93. Zhao M, Running SW (2010) Drought-induced reduction in global terrestrial net primary production from 2000 through 2009. Science 329:940–943CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Michael Marshall
    • 1
  • Christopher Funk
    • 2
  • Joel Michaelsen
    • 1
  1. 1.Department of Geography, Climate Hazards GroupUniversity of California Santa BarbaraSanta BarbaraUSA
  2. 2.US Geological Survey Earth Resources Observation and Science (EROS) Center, Department of GeographyUniversity of California Santa BarbaraSanta BarbaraUSA

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