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Worse cyclones will hit East Asia

January 16, 2014
Reading time: 3 minutes
Primary Author: Kieran Cooke

 

FOR IMMEDIATE RELEASE Hundreds of thousands of people in the Philippines are trying to piece together their lives after the devastation caused late last year by tropical cyclone Haiyan. New research shows that while such cyclones are growing in strength they are increasingly tracking northwards to hit the coasts of China, Korea and Japan. LONDON, 16 January – It will be of little comfort to people in the southern and central Philippines repeatedly hit by tropical cyclones over the years, but a new study indicates that storm patterns might be shifting northwards. The study, by a team of scientists at Seoul National University and other South Korean scientific institutions, looks at tropical cyclone activity across the north-west Pacific between 1977 and 2010. Researchers found that increasing sea surface temperatures likely due to climate change, together with changes in atmospheric circulation patterns, have led to a significant increase in the intensity of tropical cyclones hitting the east Asia region over the 30-year period. “Noticeable increases of greenhouse gases over the globe could influence rising sea surface temperature and change large-scale atmospheric circulation in the western North Pacific, which could enhance the intensity of tropical cyclones hitting land over east Asia”, says Professor Chang-Hoi Ho, one of the study’s authors.

Intensity changes

The study, which appears in the journal Environmental Research Letters, analyses five separate sets of data relating to the growth and behaviour of tropical cyclones across the north-west Pacific. It found that the area of maximum storm intensity had shifted both westward and northward: while the intensity of tropical cyclones had lessened somewhat in areas of south-east Asia it had increased significantly in east Asia – particularly in coastal regions of central China and of Japan and around the Korean peninsula. The study found that cyclones were tending to build up around the northern Philippines and track along coastal areas from Vietnam northwards, gaining energy along the way. The researchers say a significant factor behind the alteration in the intensity and direction of tropical cyclones is a change in what’s called the Walker circulation – an ocean-based atmospheric circulation system over the Pacific.

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Sea temperature difference

The Walker circulation strengthens as the difference between sea temperatures in the warmer western Pacific and the colder central-eastern Pacific grows more marked: the result is that wind flows associated with the Walker circulation drive tropical cyclones towards the north-eastern coast of Asia, where they reach maximum intensity. “This change in large-scale climatic fields suggests that the principal region in which many tropical cyclones attain peak intensity during their lifetime might have been translocated”, says the study. Cyclone Haiyan ravaged a large part of the central coastline of the eastern Philippines. However, the study found that over the 30-year period analysed, tropical cyclone activity in seas off the east Philippines coast had decreased while “the maximum intensity has shifted toward east Asia and intensified landfall intensity.” That’s bad news for millions of coastal dwellers in central and northern China, Japan and on the Korean peninsula. More catastrophic tropical cyclones will strike east Asia in future than ever before, says the study. – Climate News Network



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