Advertisement

Climate Dynamics

, Volume 40, Issue 7–8, pp 1707–1720 | Cite as

Structures and mechanisms of the first-branch northward-propagating intraseasonal oscillation over the tropical Indian Ocean

  • Kuiping Li
  • Weidong Yu
  • Tim Li
  • V. S. N. Murty
  • Somkiat Khokiattiwong
  • T. R. Adi
  • S. Budi
Article

Abstract

The first-branch northward-propagating intraseasonal oscillation (FNISO) over the tropical Indian Ocean (IO) often triggers the onset of the Asian summer monsoon. In this study we investigate the structures and mechanisms associated with FNISO through the diagnosis of ERA-Interim reanalysis data for the period of 1990–2009. A composite analysis is conducted to reveal the structure and evolution characteristics of the FNISO and associated background circulation changes. It is found that the FNISO convection originates from the southwestern IO and propagates eastward. After reaching the eastern IO, the major convective branch moves northward toward the northern Bay of Bengal (BoB). Two possible mechanisms may contribute to the northward propagation of the FNISO. One is the meridional asymmetry of the background convective instability. A greater background convective instability over the northern BoB may destabilize Rossby waves and cause convection to shift northward. The other is the meridional phase leading of perturbation humidity in the planetary boundary layer (PBL). Maximum PBL moisture appears to the north of the convection center, which promotes a convectively unstable stratification ahead of the convection and leads to the northward propagation of the FNISO. A PBL moisture budget analysis reveals that anomalous zonal advection is a dominant process in contributing to the moisture asymmetry.

Keywords

Intraseasonal oscillation Northward propagation Monsoon onset 

Notes

Acknowledgments

This work was supported by Chinese MoST grants 2009DFA21000, 2010CB950303, NSFC grant 41005032, SOA grant 2011246 and FIO grant 2008T02. This research is part of the Southeast Asian Global Ocean Observation System (SEAGOOS) pilot project entitled Monsoon Onset Monitoring and its Social and Ecosystem Impacts (MOMSEI) under the Sub-Commission for Western Pacific of the Intergovernmental Oceanographic Commission (IOC-WESTPAC). Tim Li was supported by NSF AGS-1106536 and by the International Pacific Research Center that is sponsored by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC), NASA (NNX07AG53G) and NOAA (NA17RJ1230). This research is also part of the collaboration program between the National Institute of Oceanography/Council of Scientific and Industrial Research (NIO/CSIR) and the National Science Foundation of China (NSFC). This is SOEST contribution number 8725, IPRC contribution number 905 and NIO contribution number 5220.

References

  1. Bellon G, Sobel AH (2008) Instability of the axisymmetric monsoon flow and intraseasonal oscillation. J Geophys Res 113:D07108. doi: 10.1029/2007JD009291 CrossRefGoogle Scholar
  2. Chou C, Hsueh YC (2010) Mechanisms of northward-propagating intraseasonal oscillation—a comparison between the Indian Ocean and the Western North Pacific. J Clim 23:6624–6640CrossRefGoogle Scholar
  3. Dee DP et al (2011) The ERA-interim reanalysis: configuration and performance of the data assimilation system. Q J R Meteorol Soc 137:553–597CrossRefGoogle Scholar
  4. Ding Y, He C (2006) The summer monsoon onset over the tropical eastern Indian Ocean: the earliest onset process of the Asian summer monsoon. Adv Atmos Sci 23(6):940–950CrossRefGoogle Scholar
  5. Dixit V, Srinivasan J (2011) The role of vertical shear of the meridional winds in the northward propagation of ITCZ. Geophys Res Lett 38:L08812. doi: 10.1029/2010GL046601 CrossRefGoogle Scholar
  6. Drbohlav HKL, Wang B (2005) Mechanism of the northward-propagating intraseasonal oscillation: insights from a zonally symmetric model. J Clim 18:952–972CrossRefGoogle Scholar
  7. Fu X, Wang B, Li T, McCreary J (2003) Coupling between northward-propagating, intraseasonal oscillations and sea surface temperature in the Indian Ocean. J Atmos Sci 60(15):1733–1753CrossRefGoogle Scholar
  8. Goswami BN (2005) South Asian monsoon. In: Lau WKM, Waliser DE (eds) Intraseasonal variability in the atmosphere–ocean climate system. Springer, Berlin, pp 19–61CrossRefGoogle Scholar
  9. Hsu PC, Li T (2012) Role of the boundary layer moisture asymmetry in causing the eastward propagation of the Madden–Julian oscillation. J Clim 25:4914–4931CrossRefGoogle Scholar
  10. Jiang X, Li T (2005) Re-initiation of the boreal summer intraseasonal oscillation in the tropical Indian Ocean. J Clim 18:3777–3795CrossRefGoogle Scholar
  11. Jiang X, Li T, Wang B (2004) Structures and mechanisms of the northward propagating boreal summer intraseasonal oscillation. J Clim 17:1022–1039CrossRefGoogle Scholar
  12. Kang IS, Kim D, Kug JS (2010) Mechanism for northward propagation of boreal summer intraseasonal oscillation: convective momentum transport. Geophys Res Lett 37:L24804. doi: 10.1029/2010GL045072 CrossRefGoogle Scholar
  13. Kemball-Cook S, Wang B (2001) Equatorial waves and air-sea interaction in the boreal summer intraseasonal oscillation. J Clim 14:2923–2942CrossRefGoogle Scholar
  14. Lawrence DM, Webster PJ (2002) The boreal summer intraseasonal oscillation: relationship between northward and eastward movement of convection. J Atmos Sci 59:1593–1606CrossRefGoogle Scholar
  15. Li T (2010) Monsoon climate variabilities. In: Sun DZ, Frank B (eds) Climate dynamics: why does climate vary? Geophys. Monogr. Ser. doi: 10.1029/2008GM000782
  16. Li T, Wang B (1994) The influence of sea surface temperature on tropical intraseasonal oscillation: a numerical study. Mon Weather Rev 122:2349–2362CrossRefGoogle Scholar
  17. Li T, Wang B (2005) A review on the western North Pacific monsoon: synoptic-to-interannual variabilities. Terr Atmos Ocean Sci 16:285–314Google Scholar
  18. Li T, Zhou C (2009) Planetary scale selection of the Madden–Julian oscillation. J Atmos Sci 66:2429–2443CrossRefGoogle Scholar
  19. Li Z, Yu W, Li T, Murty VSN, Tangang F (2012) Bimodal character of cyclone climatology in Bay of Bengal modulated by monsoon seasonal cycle. J Clim (in revision)Google Scholar
  20. Liebmann B, Smith CA (1996) Description of a complete (interpolated) outgoing longwave radiation dataset. Bull Am Meteorol Soc 77:1275–1277Google Scholar
  21. Madden RA (1986) Seasonal variations of the 40–50 day oscillation in the tropics. J Atmos Sci 43:3138–3158CrossRefGoogle Scholar
  22. Madden RA, Julian PR (1971) Detection of a 40–50 day oscillation in the zonal wind in the tropical Pacific. J Atmos Sci 28:702–708CrossRefGoogle Scholar
  23. Madden RA, Julian PR (1972) Description of global-scale circulation cells in the tropics with a 40–50 day period. J Atmos Sci 29:3138–3158Google Scholar
  24. Murakami T (1980) Empirical orthogonal function analysis of satellite-observed outgoing longwave radiation during summer. Mon Weather Rev 108:205–222CrossRefGoogle Scholar
  25. Salby ML, Hendon HH (1994) Intraseasonal behavior of clouds, temperature, and motion in the tropics. J Atmos Sci 51:2207–2224CrossRefGoogle Scholar
  26. Wang B (2006) The Asian monsoon. Springer, Praxis, pp 61–62Google Scholar
  27. Wang B, Li T (1994) Convective interaction with boundary-layer dynamics in the development of a tropical intraseasonal system. J Atmos Sci 51:1386–1400CrossRefGoogle Scholar
  28. Wang B, Rui H (1990) Synoptic climatology of transient tropical intraseasonal convection anomalies: 1975–1985. Meteorol Atmos Phys 44:43–61CrossRefGoogle Scholar
  29. Wang B, Webster P, Kikuchi K, Yasunari T, Qi Y (2006) Boreal summer quasi-monthly oscillation in the global tropics. Clim Dyn 27:661–675. doi: 10.1007/s00382-006-0163-3 CrossRefGoogle Scholar
  30. Wu MLC, Schubert SD, Suarez MJ, Pegion PJ, Waliser DE (2006) Seasonality and meridional propagation of the MJO. J Clim 19:1901–1921CrossRefGoogle Scholar
  31. Yanai M, Esbensen S, Chu JH (1973) Determination of bulk properties of tropical cloud clusters from large-scale heat and moisture budgets. J Atmos Sci 30:611–627CrossRefGoogle Scholar
  32. Yasunari T (1979) Cloudiness fluctuations associated with the northern hemisphere summer monsoon. J Meteorol Soc Japan 57:227–242Google Scholar
  33. Zhang C, Dong M (2004) Seasonality in the Madden–Julian oscillation. J Clim 17:3169–3180CrossRefGoogle Scholar
  34. Zhang Z, Chan JCL, Ding Y (2004) Characteristics, evolution and mechanisms of the summer monsoon onset over Southeast Asia. Int J Climatol 24:1461–1482. doi: 10.1002/joc.1082 CrossRefGoogle Scholar
  35. Zhu W, Li T, Fu X, Luo JJ (2010) Influence of the maritime continent on the boreal summer intraseasonal oscillation. J Meteorol Soc Japan 88:395–407CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Kuiping Li
    • 1
  • Weidong Yu
    • 1
  • Tim Li
    • 2
  • V. S. N. Murty
    • 3
  • Somkiat Khokiattiwong
    • 4
  • T. R. Adi
    • 5
  • S. Budi
    • 5
  1. 1.Center for Ocean and Climate ResearchFirst Institute of Oceanography, SOAQingdaoChina
  2. 2.IPRC and Department of MeteorologyUniversity of HawaiiHonoluluUSA
  3. 3.National Institute of Oceanography Regional CentreVisakhapatnamIndia
  4. 4.Phuket Marine Biology CenterPhuketThailand
  5. 5.Agency for Marine and Fishery Research and DevelopmentCenter for Marine and Coastal Resources Research and DevelopmentJakartaIndonesia

Personalised recommendations