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1204 periods (1981, 1984, 1991, 1998 and 2005). Similarly monsoon Hadley index is also evaluated to define the strength of ISO, which also represents the same El Nino and La Nina periods (Fig. 6b). The relationship between MHI and monsoon rainfall is 0.6. In the year 2002, MJO and MHI are 0.31 and -1.2 respectively, while in 1998 they are -0.91 and 0.26. Thus year-to-year variability of Indian summer monsoon activity (rainfall) can be identified using above indices. Canadian Journal of Pure and Applied Sciences Fig. 5. a & b. Composite anomaly OLR and zonal wind fields for (a) La Nina (1998) and (b) El Nino (2002) monsoon years (shaded regions represent negative anomalies; percentage denote all India rainfall). CONCLUSIONS The analysis of datasets of satellite derived OLR and NCEP winds over the study region for 27-years reveals some interesting facts of variability of Indian monsoon. The mean annual cycle of OLR in the tropics is dominated by changes in cloudiness caused by the Indian monsoon. Out of 73 pentads, P-30 to P-55 pentads show marked large scale monsoon convective activity. Mean
annual cycle of wind field supported above monsoon variability. The Interannual variability of ISO is partly linked to ENSO cycle. Strong ISO activity is often observed with La Nina. Indices of MJO and monsoon indicate year-to-year variation of summer monsoon rainfall. ACKNOWLEDGEMENTS The authors are thankful to Ministry of Earth System Sciences, Government of India, New Delhi for financial support through a research project (11/MRDF/1/41/P/08). The authors are also thankful to NCEP/NCAR and NOAA team for providing data. Kumar et al. Fig. 6a. Inter annual variation of MJO Index during 1979-2005. Fig. 6b. Inter annual variation of monsoon Hadley index during 1979-2005. REFERENCES 1205 Annamalai, H., Slingo, JM, Sperber, KR, and Hodges, K. 1999. The mean evolution and variability of the Asian summer monsoon: Comparison of ECMWF and NCEP- NCAR reanalysis. Mon. Wea. Rev. 127:1157-1186. Annamalai, H. and Slingo, JM. 2001. Active/break cycles: Diagnosis of the intraseasonal variability over the Asian summer monsoon. Climate Dynamics. 18: 85-102. Bhanu Kumar, OSRU., Muni Krishna, K. and Ramalingeswara Rao, S. 2008. Simulation of environmental heavy rainfall episodes during June and July 2006 - A case study, Canadian Journal of Pure and Applied Sciences. 2(1):211-220.
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EDITOR MZ Khan, SENRA Academic Publ
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SENRA Academic Publishers, Burnaby,
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Table1. Evolution of glucosamine an
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SENRA Academic Publishers, Burnaby,
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Page 52 and 53: 1178 dimethyl-2H-indazol-6-yl)methy
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