18O depletion in monsoon rain relates to large scale organized convection rather than the amount of rainfall.

There exists a large spatiotemporal variability in the daily rainfall; whereas the δ 18 O values of rain are significantly coherent at all the stations (linear cross-correlation coefficients of rain in different stations are mostly insignificant, while those of δ 18 O of rain between stations are highly significant, as shown in supplementary Table 1 ).

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