Climatic Change

, Volume 104, Issue 2, pp 403–414 | Cite as

Enhanced spring convective barrier for monsoons in a warmer world?

A letter
  • Anji Seth
  • Sara A. Rauscher
  • Maisa Rojas
  • Alessandra Giannini
  • Suzana J. Camargo
Letter

Abstract

Twenty-first century climate model projections show an amplification of the annual cycle in tropical precipitation with increased strength in both wet and dry seasons, but uncertainty is large and few studies have examined transition seasons. Here we analyze coupled climate model projections of global land monsoons and show a redistribution of precipitation from spring to summer in northern (North America, West Africa and Southeast Asia) and southern (South America, Southern Africa) regions. The annual cycle changes are global in scale. Two mechanisms, remote (based on tropospheric stability) and local (based on low level and surface moisture), are evaluated through the annual cycle. Increases in tropospheric stability persist from winter into spring and are reinforced by a reduction in surface moisture conditions, suggesting that in spring both remote and local mechanisms act to inhibit convection. This enhanced spring convective barrier leads to reduced early season rainfall; however, once sufficient increases in moisture (by transport) are achieved, decreases in tropospheric stability result in increased precipitation during the late rainy season. Further examination of this mechanism is needed in observations and models, as the projected changes would have substantial implications for agriculture, water management, and disaster preparedness.

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References

  1. Annamalai H, Hamilton K, Sperber KR (2007) The South Asian summer monsoon and its relationship with ENSO in the IPCC AR4 simulations. J Climate 20(6):1071–1092. doi:10.1175/JCLI4035.1 CrossRefGoogle Scholar
  2. Biasutti M, Sobel AH (2009) Delayed Sahel rainfall and global seasonal cycle in a warmer climate. Geophys Res Lett 36. doi:10.1029/2009GL041303 CrossRefGoogle Scholar
  3. Biasutti M, Sobel AH, Camargo SJ (2009) The role of the Sahara low in summertime Sahel rainfall variability and change in the CMIP3 models. J Climate 22(21):5755–5771CrossRefGoogle Scholar
  4. Chao WC, Chen B (2001) The origin of monsoons. J Atmos Sci 58(22):3497–3507CrossRefGoogle Scholar
  5. Chiang JC, Sobel AH (2002) Tropical tropospheric temperature variations caused by ENSO and their influence on the remote tropical climate. J Climate 15:2616–2631CrossRefGoogle Scholar
  6. Chou C, Neelin JD (2004) Mechanisms of global warming impacts on regional tropical precipitation. J Climate 17:2688–2701CrossRefGoogle Scholar
  7. Chou C, Neelin JD, Su H (2001) Ocean-atmosphere-land feedbacks in an idealized monsoon. Q J R Meteorol Soc 127:1869–1891CrossRefGoogle Scholar
  8. Chou C, Neelin JD, Chen CA, Tu JY (2009) Evaluating the rich-get-richer mechanism in tropical precipitation change under global warming. J Climate 22:1982–2005CrossRefGoogle Scholar
  9. Christensen JH, Hewitson B, Busuioc A, Chen A, Gao X, Held I, Jones R, Kolli RK, Kwon WT, Laprise R, Rueda VM, Mearns L, Menéndez CG, Räisänen J, Rinke A, Sarr A, Whetton P (2007) Regional climate projections. In: Solomon S, Qin D, Manning M, Chen Z, Marquis M, Averyt K, Tignor M, Miller H (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, Chapter 11. Cambridge University Press, New York, pp 235–336Google Scholar
  10. Collini EA, Berbery EH, Barros VR, Pyle ME (2008) How does soil moisture influence the early stages of the South American monsoon? J Climate 21(2):195–213CrossRefGoogle Scholar
  11. Douville H, Royer JF, Polcher J, Cox P, Gedney N, Stephenson DB, Valdes PJ (2000) Impact of CO2 doubling on the Asian summer monsoon: robust versus model-dependent responses. J Meteorol Soc Jpn 78:421–439Google Scholar
  12. Giannini A (2010) Mechanisms of climate change in the semiarid African Sahel: the local view. J Climate 23(3):743–756CrossRefGoogle Scholar
  13. Giannini A, Biasutti M, Held I, Sobel A (2008) A global perspective on African climate. Clim Change 90(4):359–383. doi:10.1007/s10584-008-9396-y CrossRefGoogle Scholar
  14. Grimm AM, Pal JS, Giorgi F (2007) Connection between spring conditions and peak summer monsoon rainfall in South America: role of soil moisture, surface temperature, and topography in eastern Brazil. J Climate 20(24):5929–5945. doi:10.1175/2007JCLI1684.1 CrossRefGoogle Scholar
  15. Held IM (2001) The partitioning of the poleward energy transport between the tropical ocean and atmosphere. J Atmos Sci 58:943–948CrossRefGoogle Scholar
  16. Held IM, Soden BJ (2006) Robust responses of the hydrological cycle to global warming. J Climate 19:5686–5699CrossRefGoogle Scholar
  17. Lau K, Kim M, Kim K (2006) Asian summer monsoon anomalies induced by aerosol direct forcing: the role of the Tibetan Plateau. Clim Dyn 26(7):855–864. doi:10.1007/s00382-006-0114-z CrossRefGoogle Scholar
  18. Li W, Fu R (2004) Transition of the large-scale atmospheric and land surface conditions from the dry to the wet season over Amazonia as diagnosed by the ECMWF re-analysis. J Climate 17(13):2637–2651CrossRefGoogle Scholar
  19. Meehl G, Stocker T, Collins W, Friedlingstein P, Gaye A, Gregory JM, Kitoh A, Knutti R, Murphy JM, Noda A, Raper SCB, Watterson IG, Weaver AJ, Zhao ZC (2007a) Climate change 2007: the physical science basis. Contribution of working group I to the fourth assessment report of the Intergovernmental Panel on Climate Change. Chapter: Global climate projections. Cambridge University Press, CambridgeGoogle Scholar
  20. Meehl GA, Covey C, Delworth T, Mojib L, McAvaney B, Mitchell JFB, Stouffer RJ, Taylor KE (2007b) The WCRP CMIP3 multimodel dataset: a new era in climate change research. Bull Am Meteorol Soc 88:1383–1394CrossRefGoogle Scholar
  21. Meehl GA, Arblaster JM, Collins WD (2008) Effects of black carbon aerosols on the Indian monsoon. J Climate 21(12):2869–2882. doi:10.1175/2007JCLI1777.1 CrossRefGoogle Scholar
  22. Neelin JD, Held IM (1987) Modeling tropical convergence based on the moist static energy budget. Mon Weather Rev 115:3–12CrossRefGoogle Scholar
  23. Neelin JD, Chou C, Su H (2003) Tropical drought regions in global warming and El Niño teleconnections. Geophys Res Lett 30. doi:10.1029/2003GL018625 Google Scholar
  24. Rauscher SA, Giorgi F, Diffenbaugh NS, Seth A (2008) Extension and intesification of the Meso-American mid-summer drought in the twenty-first century. Climate Dynamics 31:551–571. doi:10.1007/s00382-007-0359-1 CrossRefGoogle Scholar
  25. Seager R, Ting M, Held I, Kushnir Y, Lu J, Vecchi G, Huang HP, Harnik N, Leetmaa A, Lau NC, Li C, Velez J, Naik N (2007) Model projections of an imminent transition to a more arid climate in southwestern North America. Science 316(5828):1181–1184CrossRefGoogle Scholar
  26. Seth A, Rojas M, Rauscher SA (2010) CMIP3 projected changes in the annual cycle of the South American monsoon. Clim Change 98:331–357. doi:10.1007/s10584-009-9736-6 CrossRefGoogle Scholar
  27. Sobel AH, Held IM, Bretherton CS (2002) The ENSO signal in tropical tropospheric temperature. J Climate 15(18):2702–2706CrossRefGoogle Scholar
  28. Sutton RT, Dong B, Gregory JM (2007) Land/sea warming ratio in response to climate change: IPCC AR4 model results and comparison with observations. Geophys Res Lett 34(L02701). doi:10.1029/2006GL028164 Google Scholar
  29. Tan PH, Chou C, Tu JY (2008) Mechanisms of global warming impacts on robustness of tropical precipitation asymmetry. J Climate 21:5585–5602CrossRefGoogle Scholar
  30. Tanaka HL, Ishizaki N, Nohara D (2005) Intercomparison of the intensities and trends of Hadley, Walker and monsoon circulations in the global warming projections. SOLA 1:77–80. doi:10.2151/sola.2005021 CrossRefGoogle Scholar
  31. Taylor CM, Harris PP, Parker DJ (2010) Impact of soil moisture on the development of a Sahelian mesoscale convective system: a case-study from the AMMA special observing period. Q J R Meteorol Soc 136(S1):456–470. doi:10.1002/qj.465 CrossRefGoogle Scholar
  32. Vecchi GA, Soden BJ (2007) Global warming and the weakening of the tropical circulation. J Climate 20:4316–4340CrossRefGoogle Scholar
  33. Vera C, Silvestri G, Liebmann B, Gonzalez P (2006) Climate change scenarios for seasonal precipitation in South America from IPCC-AR4 models. Geophys Res Let 33. doi:10.1029/2006GL025759 Google Scholar
  34. Wang B, Ding Q (2006) Changes in global monsoon precipitation over the past 56 years. Geophys Res Lett 33(6). doi:10.1029/2005GL025347 Google Scholar
  35. Webster PJ, Magaña VO, Palmer TN, Shukla J, Thomas RA, Yanai M, Yasunari T (1998) Monsoons: processes, predictability, and the prospects for prediction. J Geophys Res 103:14451–14510. doi:10.1029/97JC02719 CrossRefGoogle Scholar
  36. Xie P, Arkin P (1996) Analysis of global monthly precipitation using gauge observation, satellite estimates and numerical model predictions. J Climate 9:840–858CrossRefGoogle Scholar
  37. Zhou T, Zhang L, Li H (2008) Changes in global land monsoon area and total rainfall accumulation over the last half century. Geophys Res Lett 35(16). doi:10.1029/2008GL034881 CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Anji Seth
    • 1
  • Sara A. Rauscher
    • 2
  • Maisa Rojas
    • 3
  • Alessandra Giannini
    • 4
  • Suzana J. Camargo
    • 5
  1. 1.University of ConnecticutStorrsUSA
  2. 2.Los Alamos National LaboratoryLos AlamosUSA
  3. 3.University of ChileSantiagoChile
  4. 4.International Research Institute for Climate and SocietyPalisadesUSA
  5. 5.Lamont Doherty Earth ObservatoryPalisadesUSA

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