ONSET AND WITHDRAWAL DATES OF NORTHEAST MONSOON FOR WESTERN ZONE OF TAMIL NADU

S. FRANKLIN¹, S. KOKILAVANI²*, S. PANNEERSELVAM³, Ga DHEEBAKARAN⁴, S.P. RAMANATHAN^5
1Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
²Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
³Director, Water Technology Centre, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India
⁴Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
⁵Professor and Head, Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
* Corresponding Author : kokilavani.s@tnau.ac.in

Received : 03-02-2020     Accepted : 26-02-2020     Published : 28-02-2020
Volume : 12     Issue : 4       Pages : 9556 - 9558
Int J Agr Sci 12.4 (2020):9556-9558

Keywords : North East Monsoon, Western Agro Climatic Zone, Onset and Withdrawal
Academic Editor : Dr R. S. Umakanth, Monpara B A, Basu Shrabani
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India.
Author Contribution : All authors equally contributed

South peninsular India experiences a large portion of the annual rainfall during the North East Monsoon (NEM) season from October to December. An analytical study was carried out to identify the onset and withdrawal of NEM rainfall for Western Agro Climatic Zone (ACZ) of Tamil Nadu at block level. Block level daily rainfall data from 1981-2010 has been obtained from Agro Climatic Research Centre and Aphrodite’s gridded set data was utilized for missing places. To determine the onset and withdrawal of NEM, the procedure given by India Meteorological Department (1943) was adopted. In this method, the date of onset and withdrawal of monsoon rainfall were arrived on the basis of mean of five days total rainfall. Initial probability analysis was taken up to find out the onset and withdrawal date of NEM at 50 percent probability level. The normal onset date for Coimbatore and Erode ranged from 3rd October to 18th October, while for Tiruppur date ranged from 3rd October to 22nd October. Cessation date for Coimbatore ranged from 6th December to 3rd January, for Erode 17th December to 1st January and for Thiruppur 6th December to 27th December and duration of the monsoon period rained from 54 to 85 days for all places.

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