Details

Autor(en) / Beteiligte

• Naidu, C.V.
• Dharma Raju, A.
• Vinay Kumar, P.
• Satyanarayana, G.Ch

Titel

Perceptible changes in Indian summer monsoon rainfall in relation to Indian Monsoon Index

Ist Teil von

• Global and planetary change, 2017-10, Vol.157, p.83-92

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The changes in the summer monsoon rainfall over 30 meteorological subdivisions of India with respect to changes in circulation and the Indian Monsoon Index (IMI) have been studied for the period 1953–2012. The relationship between the IMIs in different months and whole season and the corresponding summer monsoon rainfall is studied and tested. The positive and negative extremes are evaluated basing on the normalized values of the deviations from the mean of the IMI. Composite rainfall distributions over India and the zonal wind distributions in the lower and upper troposphere of IMI's both positive and negative extremes are evaluated separately and discussed. In the recent three decades of global warming, the negative values of IMI in July and August lead to weakening of the monsoon system over India. It is observed that the rainfall variations in the Northeast India are different from the rest of India except Tamil Nadu in general. •In the recent three decades, the negative values of IMI in July and August lead to weakening of Indian monsoon system.•The positive relationship between IMI and the monsoon rainfall over major part of India is highly significant.•The rainfall variations in the Northeast India and Tamil Nadu are different from the rest of India.•More intensified easterly jet stream over India is a feature of the positive extreme of IMI.•Strong easterlies over North Bay of Bengal facilitate the active monsoon conditions over India.