Impact Of Indian Ocean Climate Indicates On Monsoonal Rainfall In India

Abstract

The present study investigates the influence of the Pacific Decadal Oscillation (PDO) on the Indian monsoon using a linked climate model. The PDO is characterized by temperature fluctuations in the tropical Pacific Ocean, exhibiting shifts between cool (negative phase) and warm (positive phase) conditions, which can significantly impact global weather systems. In the Asia-Pacific region, the PDO primarily affects sea surface temperatures and oceanic circulation patterns, with secondary effects on regional climate, precipitation, and atmospheric dynamics. This study aims to examine the relationship between the PDO and monsoonal rainfall at five meteorological stations across India. The findings reveal both positive and negative correlations between PDO phases and monsoonal precipitation at the selected locations. Overall, the results suggest that a strong PDO signal is often associated with a weaker Indian monsoon. A better understanding of the interplay between large-scale ocean-atmosphere indices and land-surface hydrological processes could enhance the accuracy of monsoon forecasting in India.