Climate Dynamics

, Volume 37, Issue 1–2, pp 83–101 | Cite as

Effects of increased CO2 levels on monsoons

  • Annalisa Cherchi
  • Andrea Alessandri
  • Simona Masina
  • Antonio Navarra
Article

Abstract

Increased atmospheric carbon dioxide concentration provided warmer atmospheric temperature and higher atmospheric water vapor content, but not necessarily more precipitation. A set of experiments performed with a state-of-the-art coupled general circulation model forced with increased atmospheric CO2 concentration (2, 4 and 16 times the present-day mean value) were analyzed and compared with a control experiment to evaluate the effect of increased CO2 levels on monsoons. Generally, the monsoon precipitation responses to CO2 forcing are largest if extreme concentrations of carbon dioxide are used, but they are not necessarly proportional to the forcing applied. In fact, despite a common response in terms of an atmospheric water vapor increase to the atmospheric warming, two out of the six monsoons studied simulate less or equal summer mean precipitation in the 16×CO2 experiment compared to the intermediate sensitivity experiments. The precipitation differences between CO2 sensitivity experiments and CTRL have been investigated specifying the contribution of thermodynamic and purely dynamic processes. As a general rule, the differences depending on the atmospheric moisture content changes (thermodynamic component) are large and positive, and they tend to be damped by the dynamic component associated with the changes in the vertical velocity. However, differences are observed among monsoons in terms of the role played by other terms (like moisture advection and evaporation) in shaping the precipitation changes in warmer climates. The precipitation increase, even if weak, occurs despite a weakening of the mean circulation in the monsoon regions (“precipitation-wind paradox”). In particular, the tropical east-west Walker circulation is reduced, as found from velocity potential analysis. The meridional component of the monsoon circulation is changed as well, with larger (smaller) meridional (vertical) scales.

Keywords

Carbon dioxide forcing Monsoon precipitation Coupled model experiments 

References

  1. Adams DK, Comrie AC (1997) The North American monsoon. Bull Am Meteor Soc 78:2197–2213CrossRefGoogle Scholar
  2. Allen MR, Ingram WJ (2002) Constraints on future changes in climate and the hydrologic cycle. Nature 419:224–232CrossRefGoogle Scholar
  3. Annamalai H, Hamilton K, Sperber KR (2007) The South Asian summer monsoon and its relationship with ENSO in the IPCC AR4 simulations. J Clim 20:1071–1092CrossRefGoogle Scholar
  4. Ashfaq M, Shi Y, Tung WW, Trapp RJ, Gao XJ, Pal JS, Diffenbaugh NS (2009) Suppression of south Asian summer monsoon precipitation in the 21st century. Geophys Res Lett 36:L01704. doi:10.1029/2008GL036500 CrossRefGoogle Scholar
  5. Bellucci A, Gualdi S, Navarra A (2010) The double-ITCZ syndrome in coupled general circulation models: the role of large-scale vertical circulation regimes. J Clim 23:1127–1145CrossRefGoogle Scholar
  6. Boer GJ (1993) Climate change and the regulation of the surface moisture and energy budgets. Clim Dyn 8:225–239CrossRefGoogle Scholar
  7. Bolton D (1980) The computation of equivalent potential temperature. Mon Weather Rev 108:1046–1053CrossRefGoogle Scholar
  8. Camberlin P (1997) Rainfall anomalies in the source region of the Nile and their connection with the Indian summer monsoon. J Clim 10:1380–1392CrossRefGoogle Scholar
  9. Cherchi A, Navarra A (2007) Sensitivity of the Asian summer monsoon to the horizontal resolution: differences between AMIP-type and coupled model experiments. Clim Dyn 28:273–290CrossRefGoogle Scholar
  10. Cherchi A, Masina S, Navarra A (2008) Impact of extreme CO2 levels on tropical climate: A CGCM study. Clim Dyn 31:743–758CrossRefGoogle Scholar
  11. Chou C, Neelin JD (2004) Mechanisms of global warming impacts on regional tropical precipitation. J Clim 17:2688–2701CrossRefGoogle Scholar
  12. Chou C, Neelin JD, Chen C-A, Tu J-Y (2009) Evaluating the “rich-get-richer” mechanism in tropical precipitation change under global warming. J Clim 22:1982–2005CrossRefGoogle Scholar
  13. Dai A (2006) Recent climatology, variability and trends in global surface humidity. J Clim 19:3589–3606CrossRefGoogle Scholar
  14. de Szoeke SP, Xie SP (2008) The tropical eastern Pacific seasonal cycle: assessment of errors and mechanisms in IPCC AR4 coupled ocean-atmosphere general circulation models. J Clim 21:2573–2590CrossRefGoogle Scholar
  15. Emori S, Brown SJ (2005) Dynamic and thermodynamic changes in mean and extreme precipitation under changed climate. Geophys Res Lett 32. doi:10.129/2005GL023272
  16. Forster P, Ramaswamy V, Artaxo P, Berntsen T, Betts R, Fahey DW, Haywood J, Lean J, Lowe DC, Myhre G, Nganga J, Prinn R, Raga G, Schulz M, Van Dorland R (2007) Changes in atmospheric constituents and in radiative forcing. In: Solomon S, Qin D, Manning M, Chen Z, Marquis M, Averyt KB, Tignor M, Miller HL (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, CambridgeGoogle Scholar
  17. Gill AF (1980) Some simple solutions for heat induced tropical circulations. Q J R Meteorol Soc 106:447–462CrossRefGoogle Scholar
  18. Gualdi S, Scoccimarro E, Navarra A (2008) Changes in tropical cyclone activity due to global warming: results from a high-resolution coupled general circulation model. J Clim 21:5204–5228CrossRefGoogle Scholar
  19. Gualdi S, Navarra A, Guilyardi E, Delecluse P (2003) Assessment of the tropical Indo-Pacific climate in the SINTEX CGCM. Ann Geophys 46:1–26CrossRefGoogle Scholar
  20. Held IM, Soden BJ (2006) Robust responses of the hydrological cycle to global warming. J Clim 19:5686–5699CrossRefGoogle Scholar
  21. Kalnay E, Kanamitsu M, Kistler R et al (1996) The NCEP/NCAR 40-Year Reanalysis Project. Bull Am Meteorol Soc 77:437–471Google Scholar
  22. Lau KM, Kim K-M, Lee M-I (2007) Characteristics of diurnal and seasonal cycles in global monsoon systems. J Meteorol Soc Jpn 85A:403–416CrossRefGoogle Scholar
  23. Lin JL (2007) The double-ITCZ problem in IPCC AR4 coupled GCMs: Ocean-atmosphere feedback analysis. J Clim 20:4497–4925CrossRefGoogle Scholar
  24. Liu X, Yanai M (2001) Relationship between the Indian monsoon rainfall and the tropospheric temperature over the Eurasian continent. Q J R Meteorol Soc 127:909–937CrossRefGoogle Scholar
  25. Lu J, Vecchi GA, Reichler T (2007) Expansion of the Hadley cell under global warming. Geophys Res Lett 34:L06085. doi:10.1029/2006GL028443 Google Scholar
  26. Madec G, Delecluse P, Imbard M, Levy C (1998) OPA version 8.1 Ocean General Circulation Model reference manual. Tech Rep LODYC/IPSL Note 11Google Scholar
  27. May W (2004) Potential future changes in the Indian summer monsoon due to greenhouse warming: analysis of mechanisms in a global time-slice experiment. Clim Dyn 22:389–414CrossRefGoogle Scholar
  28. Meehl GA (1992) Effect of tropical topography on global climate. Annu Rev Earth Planet Sci 20:85–112CrossRefGoogle Scholar
  29. Meehl GA, Washington WM (1993) South Asian summer monsoon variability in a model with doubled atmospheric carbon dioxide concentration. Science 260:1101–1104CrossRefGoogle Scholar
  30. Morcrette JJ (1984) Sur la paramétrisation du rayonnement dans le modèles de la circulation générale atmosphérique. Thèse de Doctorat d’Etat, Université de Sciences et Techniques de Lille 630Google Scholar
  31. Morcrette JJ, Fouquart Y (1985) On systematic errors in parameterized calculations of longwave radiation transfer. Q J R Meteorol Soc 111:691–708CrossRefGoogle Scholar
  32. Murakami T, Matsumoto J (1994) Summer monsoon over the Asian continent and Western North Pacific. J Meteorol Soc Jpn 72:719–745Google Scholar
  33. Peixoto JP, Oort AH (1992) Physics of climate. Am Inst of Physics 520Google Scholar
  34. Richter I, Xie S-P (2008) Muted precipitation increase in global warming simulations: A surface evaporation perspective. J Geophys Res 113:D24118. doi:10.1029/2008JD010561 CrossRefGoogle Scholar
  35. Roeckner E, Arpe K, Bengtsson L, Christoph M, Claussen M, Dümenil L, Esch M, Giorgetta M, Schlese U, Schulzweida U (1996) The Atmospheric general circulation Model ECHAM4: Model description and simulation of present-day climate. Max-Planck Institut für Meteorologie, Report no. 218, Hamburg, p 86Google Scholar
  36. Seidel DJ, Fu Q, Randel WJ, Reichler TJ (2008) Widening of the tropical belt in a changing climate. Nat Geosci 1:21–24Google Scholar
  37. Sun Y, Solomon S, Dai A, Portmann RW (2007) How often will it rain? J Clim 20:4801–4818CrossRefGoogle Scholar
  38. Thorncroft C, Lamb P (2005) The West African monsoon. WMO/TD no. 1266Google Scholar
  39. Ueda H, Iwai A, Kuwako K, Hori ME (2006) Impact of anthropogenic forcing on the Asian summer monsoon as simulated by eight GCMs. Geophys Res Lett 33:L06703. doi:10.1029/2005GL025336 CrossRefGoogle Scholar
  40. Vecchi GA, Soden BJ (2007) Global warming and the weakening of the tropical circulation. J Clim 20:4316–4340CrossRefGoogle Scholar
  41. Vecchi GA, Soden BJ, Wittenberg AT, Held IM, Leetma A, Harrison MJ (2006) Weakening of tropical Pacific atmospheric circulation due to anthropogenic forcing. Nature 441:73–76CrossRefGoogle Scholar
  42. Wang B, Ding Q (2008) Global monsoon: dominant mode of annual variation in the tropics. Dyn Atm Oc 44:165–183CrossRefGoogle Scholar
  43. Wang B, Li T, Ding Y, Zhang R, Wang H (2005) East Asian–Western North Pacific Monsoon: a distinctive component of the Asian–Australian monsoon system. In: The global monsoon system: research and forecast WMO/TD No.1266Google Scholar
  44. Webster PJ (1972) Response of the tropical atmosphere to local steady forcing. Mon Weather Rev 100:518–541CrossRefGoogle Scholar
  45. Webster PJ (1987) The elementary monsoon. In: Fein JS, Stephens PL (eds) Monsoons. Wiley-Interscience, New YorkGoogle Scholar
  46. Webster PJ, Yang S (1992) Monsoon and ENSO: Selectively interactive systems. Q J R Meteor Soc 118:877–926CrossRefGoogle Scholar
  47. Webster PJ, Magana V, Palmer TN, Shukla J and co-authors (1998) Monsoons: processes, predictability and the prospects for prediction. J Geophys Res 103:14451–14510Google Scholar
  48. Wu R (2008) Possible role of the Indian ocean in the in-phase transition of the Indian-to-Australian summer monsoon. J Clim 21:5727–5741CrossRefGoogle Scholar
  49. Xie P, Arkin P (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
  50. Zhou J, Lau KM (2001) Principal modes of interannual and decadal variability of summer rainfall over South America. Int J Climatol 21:1623–1644CrossRefGoogle Scholar
  51. Zhou TJ, Yu RC, Li HM, Wang B (2008) Ocean forcing to changes in global monsoon precipitation over the recent half century. J Clim 21:3833–3852CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Annalisa Cherchi
    • 1
  • Andrea Alessandri
    • 2
  • Simona Masina
    • 1
  • Antonio Navarra
    • 1
  1. 1.Centro Euro-Mediterraneo per i Cambiamenti Climatici and Istituto Nazionale di Geofisica e VulcanologiaBolognaItaly
  2. 2.Centro Euro-Mediterraneo per i Cambiamenti ClimaticiBolognaItaly

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