Long-term changes in the within-season temporal profile of southwest monsoon over western India

Journal of Earth system science

Rohit Srivastava1²  Vikram Mehta2¹  Satyendra Bhandari1² 

[1] The Centre for Research on the Changing Earth System (CRCES), Catonsville, Maryland, USA.$$;Indian Centre for Climate and Societal Impacts Research (ICCSIR) Mandvi, Kachchh, Gujarat 370 465, India.$$

关键词: Southwest monsoon;    decadal climate variability;    Pacific decadal oscillations;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

This paper presents results of a study of long term trends in the characteristics of the within-season temporal profile of southwest monsoon rainfall over western India during the last five decades in relation to global warming induced regional climate change. In contrast to recent climate change analyses and projections, no significant long-term trends have been observed in this study. Slow decadal scale variations observed are analysed in relation to Pacific Decadal Oscillations (PDO). Daily variations in rainfall anomaly show opposite characteristics during negative and positive phases of PDO. The above-normal rainfall (>25%) is found during the starting phase of monsoon in negative PDO. Over the last decade, i.e., during 2000–2007, the seasonal rainfall amount, as well as seasonal span of southwest monsoon over western India is indicative of a gradual increase.

【 授权许可】

Unknown