caa a22 4500 445799455 CHVBK 20180317145136.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00704-010-0299-2 doi (NATIONALLICENCE)springer-10.1007/s00704-010-0299-2 An investigation into observational characteristics of rainfall and temperature in Central Northeast India—a historical perspective 1889-2008 [Elektronische Daten] [N. Subash, A. Sikka, H. Ram Mohan] Mann-Kendall non-parametric test was employed for observational trend detection of monthly, seasonal and annual precipitation of five meteorological subdivisions of Central Northeast India (CNE India) for different 30-year normal periods (NP) viz. 1889-1918 (NP1), 1919-1948 (NP2), 1949-1978 (NP3) and 1979-2008 (NP4). The trends of maximum and minimum temperatures were also investigated. The slopes of the trend lines were determined using the method of least square linear fitting. An application of Morelet wavelet analysis was done with monthly rainfall during June-September, total rainfall during monsoon season and annual rainfall to know the periodicity and to test the significance of periodicity using the power spectrum method. The inferences figure out from the analyses will be helpful to the policy managers, planners and agricultural scientists to work out irrigation and water management options under various possible climatic eventualities for the region. The long-term (1889-2008) mean annual rainfall of CNE India is 1,195.1mm with a standard deviation of 134.1mm and coefficient of variation of 11%. There is a significant decreasing trend of 4.6mm/year for Jharkhand and 3.2mm/day for CNE India. Since rice crop is the important kharif crop (May-October) in this region, the decreasing trend of rainfall during the month of July may delay/affect the transplanting/vegetative phase of the crop, and assured irrigation is very much needed to tackle the drought situation. During the month of December, all the meteorological subdivisions except Jharkhand show a significant decreasing trend of rainfall during recent normal period NP4. The decrease of rainfall during December may hamper sowing of wheat, which is the important rabi crop (November-March) in most parts of this region. Maximum temperature shows significant rising trend of 0.008°C/year (at 0.01 level) during monsoon season and 0.014°C/year (at 0.01 level) during post-monsoon season during the period 1914-2003. The annual maximum temperature also shows significant increasing trend of 0.008°C/year (at 0.01 level) during the same period. Minimum temperature shows significant rising trend of 0.012°C/year (at 0.01 level) during post-monsoon season and significant falling trend of 0.002°C/year (at 0.05 level) during monsoon season. A significant 4-8years peak periodicity band has been noticed during September over Western UP, and 30-34years periodicity has been observed during July over Bihar subdivision. However, as far as CNE India is concerned, no significant periodicity has been noticed in any of the time series. Springer-Verlag, 2010 Subash N. Division of Crop Research, ICAR Parisar, ICAR Research Complex for Eastern Region, Bihar Veterinary College P.O., 800 014,, Patna, Bihar, India aut Sikka A. National Rainfed Area Authority, NASC Complex, Dev Prakash Shastri Marg, Pusa, 110012, New Delhi, India aut Ram Mohan H. Department of Atmospheric Sciences, School of Marine Sciences, Cochin University of Science and Technology, Fine Arts Avenue, 682 016,, Cochin, Kerala, India aut Theoretical and Applied Climatology Springer Vienna 103/3-4(2011-03-01), 305-319 0177-798X 103:3-4<305 2011 103 704 https://doi.org/10.1007/s00704-010-0299-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00704-010-0299-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Subash N. Division of Crop Research, ICAR Parisar, ICAR Research Complex for Eastern Region, Bihar Veterinary College P.O., 800 014,, Patna, Bihar, India aut NATIONALLICENCE 700 1- Sikka A. National Rainfed Area Authority, NASC Complex, Dev Prakash Shastri Marg, Pusa, 110012, New Delhi, India aut NATIONALLICENCE 700 1- Ram Mohan H. Department of Atmospheric Sciences, School of Marine Sciences, Cochin University of Science and Technology, Fine Arts Avenue, 682 016,, Cochin, Kerala, India aut NATIONALLICENCE 773 0- Theoretical and Applied Climatology Springer Vienna 103/3-4(2011-03-01), 305-319 0177-798X 103:3-4<305 2011 103 704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer