Open AccessImpact of Madden-Julian oscillations on the Indian summer monsoon sub-divisional rainfalls
Author(s) -
K. Seetharam
Publication year - 2008
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v59i2.1251
Subject(s) - madden–julian oscillation , climatology , monsoon , environmental science , indian ocean , seasonality , southern oscillation , el niño southern oscillation , oscillation (cell signaling) , atmospheric sciences , geology , geography , oceanography , meteorology , convection , mathematics , statistics , biology , genetics
Indian summer monsoon rainfall exhibits inter-seasonal variations in the time scales of 2-7 years which are linked to quasi-biennial oscillations and El nino-Southern Oscillation phenomenon and also intra-seasonal variations in the time-scale of 30-60 days which are linked to activity of MJO which emerged as a dominant mode of intra-seasonal oscillations of Indian summer monsoon rainfall in addition to the other modes of low frequency oscillations. In this scenario, the inter and intra seasonal variability of 29 meteorological sub-divisional rainfalls has been investigated by correlating the MJO indices at 10 different longitudes covering Indian, Pacific and Atlantic Oceans with cumulative sub-divisional summer monsoon rainfall (1979 – 2000). The results were discussed.