Abstract:
Stable isotopes (δ18O and δD) of ground level atmospheric vapour (GLV) are used to identify long range
spatial correlation in moisture variability between two geo-graphically and geo-climatically different places Roorkee
in the foot hills of Siwaliks in the north western part of the Gangetic plains and Hyderabad in the Deccan Plateau of
peninsular India. A very good isotopic correlation in atmospheric moisture and absolute humidity was observed
during 2008-10 in southern and northern part of India due to common (Arabian Sea and Bay of Bengal) dominant
moisture source to both the regions but their magnitude in the total moisture and time of onset and duration is
different in both the regions. These components and their timings are also changing in the recent years. In southern
India, these are appearing early while are getting delayed in northern India. The results on long range correlation in
GLV help understanding monsoon dynamics and climate change.
