Bimodal representation of the tropical intraseasonal oscillation

Abstract

The tropical intraseasonal oscillation (ISO) shows distinct variability centers and propagation patterns between boreal winter and summer. To accurately represent the state of the ISO at any particular time of a year, a bimodal ISO index was developed. It consists of Madden-Julian Oscillation (MJO) mode with predominant eastward propagation along the equator and Boreal Summer ISO (BSISO) mode with prominent northward propagation and large variability in off-equatorial monsoon trough regions. The spatial–temporal patterns of the MJO and BSISO modes are identified with the extended empirical orthogonal function analysis of 31 years (1979–2009) OLR data for the December–February and June–August period, respectively. The dominant mode of the ISO at any given time can be judged by the proportions of the OLR anomalies projected onto the two modes. The bimodal ISO index provides objective and quantitative measures on the annual and interannual variations of the predominant ISO modes. It is shown that from December to April the MJO mode dominates while from June to October the BSISO mode dominates. May and November are transitional months when the predominant mode changes from one to the other. It is also shown that the fractional variance reconstructed based on the bimodal index is significantly higher than the counterpart reconstructed based on the Wheeler and Hendon’s index. The bimodal ISO index provides a reliable real time monitoring skill, too. The method and results provide critical information in assessing models’ performance to reproduce the ISO and developing further research on predictability of the ISO and are also useful for a variety of scientific and practical purposes.

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Notes

  1. 1.

    Historical and real time bimodal ISO index is available from the author at URL: http://www.iprc.soest.hawaii.edu/~kazuyosh.

References

  1. Annamalai H, Sperber KR (2005) Regional heat sources and the active and break phases of boreal summer intraseasonal (30–50 day) variability. J Atmos Sci 62:2726–2748

    Article  Google Scholar 

  2. Arguez A, Yu P, O’Brien JJ (2008) A new method for time series filtering near endpoints. J Atmos Ocean Technol 25:534–546

    Article  Google Scholar 

  3. Bosilovich MG, Schubert SD, Rienecker M, Todling R, Suarez M, Bacmeister J, Gelaro R, Kim G-K, Stajner I, Chen J (2006) NASA’s modern era retrospective-analysis for research and applications. US CLIVAR Var 4:5–8

    Google Scholar 

  4. Chen SS, Houze RA Jr (1997) Diurnal variation and life-cycle of deep convective systems over the tropical pacific warm pool. Quart J Roy Met Soc 123:357–388

    Article  Google Scholar 

  5. Duchon CE (1979) Lanczos filtering in one and two dimensions. J Appl Meteorol 18:1016–1022

    Article  Google Scholar 

  6. Hendon HH, Liebmann B (1990) A composite study of onset of the Australian summer monsoon. J Atmos Sci 47:2227–2240

    Article  Google Scholar 

  7. Hendon HH, Salby ML (1994) The life cycle of the Madden-Julian oscillation. J Atmos Sci 51:2225–2237

    Article  Google Scholar 

  8. Higgins RW, Shi W (2001) Intercomparison of the principal modes of interannual and intraseasonal variability of the North American monsoon system. J Clim 14:403–417

    Article  Google Scholar 

  9. Hsu HH (1996) Global view of the intraseasonal oscillation during northern winter. J Clim 9:2386–2406

    Article  Google Scholar 

  10. Ichikawa H, Yasunari T (2008) Intraseasonal variability in diurnal rainfall over New Guinea and the surrounding oceans during austral summer. J Clim 21:2852–2868

    Article  Google Scholar 

  11. Jones C, Carvalho LMV, Higgins RW, Waliser DE, Schemm JKE (2004) Climatology of tropical intraseasonal convective anomalies: 1979–2002. J Clim 17:523–539

    Article  Google Scholar 

  12. Julian PR, Madden R (1981) Comments on a paper by T. Yasunari, a quasi-stationary appearance of 30–40-day period in the cloudiness fluctuations during the summer monsoon over India. J Meteor Soc Jpn 59:435–437

    Google Scholar 

  13. Kajikawa Y, Yasunari T (2005) Interannual variability of the 10–25- and 30–60-day variation over the South China Sea during boreal summer. Geophys Res Lett 32:L04710. doi: 10.1029/2004GL021836

  14. Kayano MT, Kousky VE (1999) Intraseasonal (30–60 day) variability in the global tropics: principal modes and their evolution. Tellus 51:373–386

    Article  Google Scholar 

  15. Kemball-Cook S, Wang B (2001) Equatorial waves and air-sea interaction in the boreal summer intraseasonal oscillation. J Clim 14:2923–2942

    Article  Google Scholar 

  16. Kessler WS, McPhaden MJ, Weickmann KM (1995) Forcing of intraseasonal Kelvin waves in the equatorial Pacific. J Geophys Res 100:10613–10631

    Article  Google Scholar 

  17. Kikuchi K, Takayabu YN (2003) Equatorial circumnavigation of moisture signal associated with the Madden-Julian oscillation (MJO) during boreal winter. J Meteor Soc Jpn 81:851–869

    Article  Google Scholar 

  18. Kikuchi K, Wang B (2010) Formation of tropical cyclones in the northern Indian Ocean associated with two types of tropical intraseasonal oscillation modes. J Meteor Soc Jpn 88:475–496

    Article  Google Scholar 

  19. Knutson TR, Weickmann KM (1987) 30–60 day atmospheric oscillations: composite life-cycles of convection and circulation anomalies. Mon Wea Rev 115:1407–1436

    Article  Google Scholar 

  20. Lau KM, Chan PH (1985) Aspects of the 40–50 day oscillation during the northern winter as inferred from outgoing long wave radiation. Mon Wea Rev 113:1889–1909

    Article  Google Scholar 

  21. Lau KM, Chan PH (1986) Aspects of the 40–50 day oscillation during the northern summer as inferred from outgoing long wave radiation. Mon Wea Rev 114:1354–1367

    Article  Google Scholar 

  22. Lau KM, Chan PH (1988) Intraseasonal and interannual variations of tropical convection: a possible link between the 40–50 day oscillation and ENSO? J Atmos Sci 45:506–521

    Article  Google Scholar 

  23. Lau KMW, Waliser DE (eds) (2005) Intraseasonal variability in the atmosphere-ocean climate system. Springer, Berlin, p 436

    Google Scholar 

  24. Liebmann B, Smith CA (1996) Description of a complete (interpolated) outgoing longwave radiation dataset. Bull Am Meteor Soc 77:1275–1277

    Google Scholar 

  25. Lorenz DJ, Hartmann DL (2006) The effect of the MJO on the North American monsoon. J Clim 19:333–343

    Article  Google Scholar 

  26. Madden RA (1986) Seasonal-variations of the 40–50 day oscillation in the tropics. J Atmos Sci 43:3138–3158

    Article  Google Scholar 

  27. Madden RA, Julian PR (1971) Detection of a 40–50 day oscillation in the zonal wind in the tropical Pacific. J Atmos Sci 28:702–708

    Article  Google Scholar 

  28. Madden RA, Julian PR (1972) Description of global-scale circulation cells in tropics with a 40–50 day period. J Atmos Sci 29:1109–1123

    Article  Google Scholar 

  29. Madden RA, Julian PR (1994) Observations of the 40–50-day tropical oscillation: a review. Mon Wea Rev 122:814–837

    Article  Google Scholar 

  30. Maloney ED, Hartmann DL (1998) Frictional moisture convergence in a composite life cycle of the Madden-Julian oscillation. J Clim 11:2387–2403

    Article  Google Scholar 

  31. Maloney ED, Hartmann DL (2000a) Modulation of eastern north Pacific hurricanes by the Madden-Julian oscillation. J Clim 13:1451–1460

    Article  Google Scholar 

  32. Maloney ED, Hartmann DL (2000b) Modulation of hurricane activity in the Gulf of Mexico by the Madden-Julian oscillation. Science 287:2002–2004

    Article  Google Scholar 

  33. McBride JL, Davidson NE, Puri K, Tyrell GC (1995) The flow during TOGA COARE as diagnosed by the BMRC tropical analysis and prediction system. Mon Wea Rev 123:717–736

    Article  Google Scholar 

  34. Miller AJ, Zhou S, Yang SK (2003) Relationship of the Arctic and Antarctic oscillations to the outgoing longwave radiation. J Clim 16:1583–1592

    Article  Google Scholar 

  35. Molinari J, Vollaro D (2000) Planetary- and synoptic-scale influences on eastern Pacific tropical cyclogenesis. Mon Wea Rev 128:3296–3307

    Article  Google Scholar 

  36. Moon J-Y, Wang B, Ha K-J (2010) ENSO regulation of MJO teleconnection. Clim Dyn, (in press)

  37. Rui H, Wang B (1990) Development characteristics and dynamic structure of tropical intraseasonal convection anomalies. J Atmos Sci 47:357–379

    Article  Google Scholar 

  38. Salby ML, Hendon HH (1994) Intraseasonal behavior of clouds, temperature, and motion in the tropics. J Atmos Sci 51:2207–2224

    Article  Google Scholar 

  39. Slingo JM, Rowell DP, Sperber KR, Nortley E (1999) On the predictability of the interannual behaviour of the Madden-Julian oscillation and its relationship with El Nino. Quart J Roy Met Soc 125:583–609

    Google Scholar 

  40. Takayabu YN, Iguchi T, Kachi M, Shibata A, Kanzawa H (1999) Abrupt termination of the 1997–1998 El Nino in response to a Madden-Julian oscillation. Nature 402:279–282

    Article  Google Scholar 

  41. von Storch H, Xu J (1990) Principal oscillation pattern analysis of the 30–60-day oscillation in the tropical troposphere. Clim Dyn 4:175–190

    Article  Google Scholar 

  42. Waliser DE, Murtugudde R, Lucas LE (2003a) Indo-Pacific Ocean response to atmospheric intraseasonal variability: 1. Austral summer and the Madden-Julian oscillation. J Geophys Res 108(C5):3160. doi: 10.1029/2002JC001620

    Google Scholar 

  43. Waliser DE, Lau KM, Stern W, Jones C (2003b) Potential predictability of the Madden-Julian oscillation. Bull Am Meteor Soc 84:33–50

    Article  Google Scholar 

  44. Waliser DE, Murtugudde R, Lucas LE (2004) Indo-Pacific Ocean response to atmospheric intraseasonal variability: 2. Boreal summer and the intraseasonal oscillation. J Geophys Res 109:C03030. doi: 10.1029/2003JC002002

  45. Waliser D, Sperber K, Hendon H, Kim D, Wheeler M, Weickmann K, Zhang C, Donner L, Gottschalck J, Higgins W, Kang IS, Legler D, Moncrieff M, Vitart F, Wang B, Wang W, Woolnough S, Maloney E, Schubert S, Stern W (2009) MJO simulation diagnostics. J Clim 22:3006–3030

    Article  Google Scholar 

  46. Wang B, Rui H (1990) Synoptic climatology of transient tropical intraseasonal convection anomalies: 1975–1985. Meteor Atmos Phys 44:43–61

    Article  Google Scholar 

  47. Wang B, Webster P, Kikuchi K, Yasunari T, Qi YJ (2006) Boreal summer quasi-monthly oscillation in the global tropics. Clim Dyn 27:661–675

    Article  Google Scholar 

  48. Weare BC, Nasstrom JS (1982) Examples of extended empirical orthogonal function analyses. Mon Wea Rev 110:481–485

    Article  Google Scholar 

  49. Webster PJ, Magana VO, Palmer TN, Shukla J, Tomas RA, Yanai M, Yasunari T (1998) Monsoons: processes, predictability, and the prospects for prediction. J Geophys Res 103:14451–14510

    Article  Google Scholar 

  50. Wheeler MC, Hendon HH (2004) An all-season real-time multivariate MJO index: development of an index for monitoring and prediction. Mon Wea Rev 132:1917–1932

    Article  Google Scholar 

  51. Yasunari T (1979) Cloudiness fluctuations associated with the northern hemisphere summer monsoon. J Meteor Soc Jpn 57:227–242

    Google Scholar 

  52. Zhang CD (2005) Madden-Julian oscillation. Rev Geophys 43:RG2003. doi:10.1029/2004RG000158

    Article  Google Scholar 

  53. Zhang CD, Dong M (2004) Seasonality in the Madden-Julian oscillation. J Clim 17:3169–3180

    Article  Google Scholar 

  54. Zhang CD, Hendon HH (1997) Propagating and standing components of the intraseasonal oscillation in tropical convection. J Atmos Sci 54:741–752

    Article  Google Scholar 

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Acknowledgments

This research was supported by NSF Grant AGS-1005599 and NOAA Grant NA10OAR4310247. Additional support was provided by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC), by NASA through grant NNX07AG53G, and by NOAA through grant NA17RJ1230 through their sponsorship of research activities at the IPRC. The interpolated OLR data are provided by the NOAA/OAR/ESRL PSD. The MERRA data are provided by the Global Modeling and Assimilation Office (GMAO) and the GES DISC. We also thank two anonymous reviewers for their constructive comments. Thanks also go to Dr. Nat Johnson for his editorial assistance and members of MJO working group, especially Dr. Matthew Wheeler, for invaluable feedback on the part of real time monitoring.

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Correspondence to Kazuyoshi Kikuchi.

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School of Ocean and Earth Science and Technology Contribution Number 8213 and International Pacific Research Center Contribution Number 798.

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Kikuchi, K., Wang, B. & Kajikawa, Y. Bimodal representation of the tropical intraseasonal oscillation. Clim Dyn 38, 1989–2000 (2012). https://doi.org/10.1007/s00382-011-1159-1

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Keywords

  • Tropical intraseasonal oscillation
  • MJO
  • Index