Analysis of trend and temporal variability in rainfall over Northeast India

Study of rainfall trend is great importance in India where food security and consequently economy primarily dependent on rainfall. Present work carried out to perform the detailed analysis temporal variability North East Temporal variation monthly, seasonal annual over northeast (NEI) studied using monthly data for 150 years (1857-2006). Magnitude time series determined by both parametric non-parametric test i.e linear regression Man-Kendall test. Analysis suggests a significant decrease monsoon increase post Influence global teleconnection like Atlantic Oscillation (NAO) Southern (SO) NEI also address variation. To carry detail analysis, further divided into five normal periods 30 year each: 1857-1886 (P1), 1887-1916 (P2), 1917-1946 (P3), 1947-1976 (P4) 1977-2006 (P5) performed above mentioned periods. Decreasing four classified three obtained 11 running mean calculated as well see changes pattern.