Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/9173
Title: Identification of trends in rainfall, rainy days and 24h maximum rainfall over subtropical Assam in Northeast India
Authors: Jhajharia D.
Yadav, Brijesh K.
Maske S.
Chattopadhyay S.
Kar A.K.
Published in: Comptes Rendus - Geoscience
Abstract: Trends in rainfall, rainy days and 24. h maximum rainfall are investigated using the Mann-Kendall non-parametric test at twenty-four sites of subtropical Assam located in the northeastern region of India. The trends are statistically confirmed by both the parametric and non-parametric methods and the magnitudes of significant trends are obtained through the linear regression test. In Assam, the average monsoon rainfall (rainy days) during the monsoon months of June to September is about 1606. mm (70), which accounts for about 70% (64%) of the annual rainfall (rainy days). On monthly time scales, sixteen and seventeen sites (twenty-one sites each) witnessed decreasing trends in the total rainfall (rainy days), out of which one and three trends (seven trends each) were found to be statistically significant in June and July, respectively. On the other hand, seventeen sites witnessed increasing trends in rainfall in the month of September, but none were statistically significant. In December (February), eighteen (twenty-two) sites witnessed decreasing (increasing) trends in total rainfall, out of which five (three) trends were statistically significant. For the rainy days during the months of November to January, twenty-two or more sites witnessed decreasing trends in Assam, but for nine (November), twelve (January) and eighteen (December) sites, these trends were statistically significant. These observed changes in rainfall, although most time series are not convincing as they show predominantly no significance, along with the well-reported climatic warming in monsoon and post-monsoon seasons may have implications for human health and water resources management over bio-diversity rich Northeast India. © 2012.
Citation: Comptes Rendus - Geoscience (2012), 344(1): 1-13
URI: https://doi.org/10.1016/j.crte.2011.11.002
http://repository.iitr.ac.in/handle/123456789/9173
Issue Date: 2012
Keywords: 24hours maximum rainfall
Assam
Mann-Kendall non-parametric test
Northeast india
Rainfall
Rainy days
Trend
ISSN: 16310713
Author Scopus IDs: 25923446300
57209494362
54934636700
35475366000
57197671444
Author Affiliations: Jhajharia, D., Department of Agricultural Engineering, North Eastern Regional Institute of Science and Technology (Deemed University), Nirjuli, Itanagar-791109, Arunachal Pradesh, India
Yadav, B.K., Department of Land, Air and Water Resources, University of California, Davis, CA 95616-8628, United States
Maske, S., Department of Hydrology, Indian Institute of Technology, Roorkee, Roorkee-247667, Uttarakhand, India
Chattopadhyay, S., Department of Computer Application, Pailan College of Management and Technology, West Bengal University of Technology, Kolkata 700104, West Bengal, India
Kar, A.K., Department of Hydrology, Indian Institute of Technology, Roorkee, Roorkee-247667, Uttarakhand, India
Corresponding Author: Chattopadhyay, S.; Department of Computer Application, Pailan College of Management and Technology, West Bengal University of Technology, Kolkata 700104, West Bengal, India; email: surajit_2008@yahoo.co.in
Appears in Collections:Journal Publications [HY]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.