Theoretical and Applied Climatology

, Volume 95, Issue 1–2, pp 69–82 | Cite as

An investigation into the conditions leading to monsoon onset over Kerala

Article

Summary

Monsoon onset over the Kerala (MOK) coast has been studied using the recently released high resolution Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite data (HOAPS 3). Columnar water vapour content, sea surface temperature and evaporation have been utilised to examine the conditions leading to MOK from −7 pentads. The role of monsoon hadley cell (MHC) has also been assessed using the NCEP/NCAR Reanalysis dataset. In addition the role of the cross-equatorial flow and low level jet at 850 hPa has also been explored, as has the importance of the Madden Julian Oscillation in initiating the MOK, the latter using outgoing longwave radiation data. An analysis of sea surface temperature over the Arabian Sea (AS) and Bay of Bengal for contrasting MOKs, showed that the AS warm pool plays a crucial role in MOK. Contrary to the popular notion that moisture builds up only 2–3 weeks in advance of MOK, our study has shown that the integrated columnar water peaks around 35–40 days (almost around the same time as that of the pre-monsoon rainfall peak) prior to MOK and can be a potential predictor of MOK. The 850 hPa winds strengthen over the extreme southern peninsula and Sri Lanka about 3 pentads prior to MOK, and the evaporation rates over the southern Arabian Sea show a dramatic increase with onset of MOK. The MHC can be a useful predictor for extreme monsoon onsets (early or delayed).

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References

  1. Ananthakrishnan, R, Soman, MK 1988The Onset of the southwest monsoon over Kerala 1901–1980J Climatol8283296CrossRefGoogle Scholar
  2. Ananthakrishnan, R, Soman, MK 1991The Onset of the southwest monsoon in 1990Curr Sci61447453Google Scholar
  3. Ananthakrishnan R, Acharya UR, Ramakrishnan AR (1967) On the criteria for declaring the onset of southwest monsoon over Kerala. IMD Forecasting Manual No. IV-18.1. India Meteorological Department, Pune, India, 52 ppGoogle Scholar
  4. Andersson A, Bakan S, Fennig K, Grassl H, Klepp C-P, Schulz J (2007) Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data – HOAPS-3-5-days mean. (doi: 10.1594/WDCC/HOAPS3_PENTAD)Google Scholar
  5. Fairall, CW, Bradley, EF, Rogers, DP, Edson, JB, Young, GS 1996Bulk parameterization of air-sea fluxes for Tropical Ocean-Global Atmosphere Coupled-Ocean Atmosphere Response ExperimentJ Geophys Res10137473764CrossRefGoogle Scholar
  6. Fasullo, J, Webster, PJ 2003A Hydrological definition of the Indian Monsoon onset and withdrawalJ Climate1632003211CrossRefGoogle Scholar
  7. Flatau, MK, Flatau, PJ, Rudnick, D 2001The dynamics of the double monsoon onsetsJ Climate1441304146CrossRefGoogle Scholar
  8. Gruber, A, Krueger, AF 1984The status of the NOAA outgoing longwave radiation datasetBull Amer Meteor Soc65958962CrossRefGoogle Scholar
  9. Joseph, PV 1990Monsoon variability in relation to equatorial trough activity over Indian and Western Pacific OceansMausam41291296Google Scholar
  10. Joseph, PV, Sijikumar, S 2004Intraseasonal variability of the low level Jet stream of the Asian Summer MonsoonJ Climate1714491458CrossRefGoogle Scholar
  11. Joseph, PV, Eishcheid, JK, Pyle, RJ 1994Inter-annual variability of the onset of the Indian summer monsoon and its association with atmospheric features, El Nino, and sea surface temperature anomaliesJ Climate781105CrossRefGoogle Scholar
  12. Joseph, PV, Sooraj, KP, Rajan, CK 2003Conditions leading to monsoon over Kerala and associated Hadley cellMausam54155164Google Scholar
  13. Joseph, PV, Sooraj, KP, Rajan, CK 2006The Summer Monsoon Onset Process over south Asia and an objective method for the date of monsoon onset over KeralaInt J Climatol2618711893CrossRefGoogle Scholar
  14. Kalnay, EM, Kanamitsu, M, Kistler, R, Collins, W, Deaven, D, Gandin, L, Iredell, M, Saha, S, White, G, Woollen, J, Zhu, Y, Leetma, A, Reynolds, R, Chelliah, M, Ebisuzaki, , Higgins, W, Janowiak, J, Mo, KC, Ropelewski, C, Wang, J, Jenne, R, Joseph, D 1996The NCEP/NCAR 40 year Reanalysis ProjectBull Amer Meteor Soc77437471CrossRefGoogle Scholar
  15. Krishnamurti, TN, Ardanuy, P, Ramanathan, Y, Pasch, R 1981On the onset vortex of summer monsoonMon Weather Rev109344363CrossRefGoogle Scholar
  16. Pearce, RP, Mohanty, UC 1984Onsets of the summer Monsoon 1979–1982J Atmos Sci4116201639CrossRefGoogle Scholar
  17. Ramesh Kumar, MR 2004Forecasting of Onset of southwest monsoon over Kerala coast using satellite dataIEEE Geosci Remote Sensing Lett1265267CrossRefGoogle Scholar
  18. Ramesh Kumar, MR, Schluessel, P 1998Air sea interaction over the Indian Ocean during the two contrasting monsoon years 1987 and 1988 studied with satellite dataTheor Appl Climatol60219231CrossRefGoogle Scholar
  19. Sadler JC, Lander MA, Hori AM, Oda LK (1987) Tropical Marine Climatic Atlas., Vol. 1. Atlantic and Indian Oceans, Vol. 2. Pacific Ocean. Department of Meteorology, University of Hawaii, USAGoogle Scholar
  20. Schleussel, P 1996

    Satellite remote sensing of evaporation over sea

    Raschke, E eds. Radiation and water in the climate system: remote measurementsSpringerHeidelberg431461
    Google Scholar
  21. Schulz, J, Meywerk, J, Ewald, S, Schleussel, P 1997Evaluation of satellite-derived latent heat fluxesJ Climate1027822795CrossRefGoogle Scholar
  22. Seetharamayya, P, Master, A 1984Observed air-sea interface conditions and a monsoon depression during MONEX-79Arch Meteor Geophys BioklA336167CrossRefGoogle Scholar
  23. Simon, B, Joshi, PC 1994Determination of moisture changes prior to the onset of monsoon over Kerala using NOAA/TOVS satellite dataMeteorol Atmos Phys53223231CrossRefGoogle Scholar
  24. Simon, B, Rahman, SH, Joshi, PC 2006Conditions leading to the onset of the Indian monsoon: a satellite perspectiveMeteorol Atmos Phys93201210doi: 10.1007/s00703-005-0155-6CrossRefGoogle Scholar
  25. Soman, MK, Krishnakumar, K 1993Space time evolution of meteorological features associated with the onset Indian Summer monsoonMon Rev12111771194CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Physical Oceanography DivisionNational Institute of OceanographyDona PaulaIndia
  2. 2.Oceanography DepartmentUniversity of Cape TownCape TownSouth Africa

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