Abstract
Abstract The paper describes some results of a climatic study of the characteristics and decennial frequencies of droughts at a few selected stations in the three dry climatic zones—arid, semi-arid and dry sub-humid—of India. The classification of the climates was done according to the 1955 water balance scheme of Thornthwaite, after a careful mapping of the moisture indices for all the climatological observatories in India. Four stations in the arid, six from the semi-arid and from the dry sub-humid zones were selected for the analytical study of droughts. The aridity index of Thornthwaite, viz., ratio of annual water deficiency to the total annual water need, expressed as a percentage, was found to be a useful parameter for the purpose. The values of this parameter were computed for each year of a 65-year period of record for all the selected stations, using the well-known book-keeping procedure of Thornthwaite. From the yearly trends of the index it could be ascertained whether a station was becoming d...
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