{"id":4715,"date":"2026-07-24T09:13:13","date_gmt":"2026-07-24T09:13:13","guid":{"rendered":"https:\/\/koshalsambada.in\/?p=4715"},"modified":"2026-07-24T09:13:13","modified_gmt":"2026-07-24T09:13:13","slug":"what-is-the-pacific-decadal-oscillation-pdo-that-is-being-linked-to-gujarats-heavy-rains-heres-what-students-should-know","status":"publish","type":"post","link":"https:\/\/koshalsambada.in\/?p=4715","title":{"rendered":"What is the Pacific Decadal Oscillation (PDO) that is being linked to Gujarat’s heavy rains? Here’s what students should know"},"content":{"rendered":"


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The Pacific Decadal Oscillation (PDO), a long-term climate pattern in the North Pacific, has come into the spotlight following Gujarat’s heavy rainfall. This explainer breaks down how the PDO works, how it differs from El Ni\u00f1o, and why scientists monitor it to better understand shifts in monsoon behaviour and other large-scale weather patterns.<\/span><\/div>\n<\/section>\n<\/div><\/div>\n<\/div>\n

Days after Gujarat witnessed unusually intense rainfall, scientists have pointed to a large-scale climate phenomenon known as the Pacific Decadal Oscillation (PDO) as one of the factors that may have amplified the weather system. While no single event can be blamed solely on the PDO, experts say its interaction with the ongoing monsoon<\/a> and other ocean-atmosphere patterns can influence rainfall distribution across several parts of the world, including India.The PDO is often compared with the better-known El Ni\u00f1o and La Ni\u00f1a because all three involve changes in Pacific Ocean temperatures. However, the PDO operates on a much longer timescale and influences climate over decades rather than months or a few years.Here are five important things you need to know about the Pacific Decadal Oscillation.<\/p>\n

1. What exactly is the Pacific Decadal Oscillation?<\/h2>\n<\/p>\n

The Pacific Decadal Oscillation (PDO) is a long-term climate pattern characterised by changes in sea surface temperatures in the North Pacific Ocean, particularly north of 20\u00b0N latitude.Unlike El Ni\u00f1o and La Ni\u00f1a, which typically last between nine months and two years, the PDO shifts between warm and cool phases over periods ranging from 10 to 30 years or even longer. Scientists first identified the pattern while studying changes in salmon populations in the North Pacific during the 1990s.In simple terms, the PDO represents large-scale changes in how warm or cold the surface waters of the North Pacific become over extended periods.<\/p>\n

2. How does the PDO work?<\/h2>\n<\/p>\n

The PDO has two phases:<\/p>\n

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