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OpinionLetters

Letters to the Editor, May 15, 2014

I fully agree that we should raise public awareness on climatic disasters caused by extreme weather events based on state-of-the-art knowledge. However, the link between climate change and natural and technological disasters is still a subject of research and debate.

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No zones yet for busy Lockhart Road. Photo: SCMP
Letters

I refer to the letter by T. C. Lee, of the Hong Kong Observatory ("Raise extreme weather awareness", April 25).

I fully agree that we should raise public awareness on climatic disasters caused by extreme weather events based on state-of-the-art knowledge. However, the link between climate change and natural and technological disasters is still a subject of research and debate.

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A recently discovered natural trigger for extreme weather events in the North Atlantic basin during 2012, including floods, droughts and storms, was the abnormal warming of the North Atlantic through a submarine volcanic eruption. This has provided the best explanation for the record low sea ice in the Arctic Ocean during the summer as well as the dramatic melting of the Greenland ice sheet in July.

In Hong Kong, the contribution of the urban heat island [effect] to the severity of the thunderstorms associated with large hailstones during the evening of March 30 cannot be ruled out completely.

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The event should instead be classified as a natural/technological disaster.

In a study last year by Leong Wai-siu and Melissa A. Hart ("Quantifying urban heat island intensity in Hong Kong SAR, China"), the most representative urban and non-urban station was found to be the Observatory's headquarters station and the Pak Tam Chung station respectively. If global warming is indeed taking place to generate more climatic disasters, why should annual mean temperatures between the two stations differ by as much as 3.8 degrees Celsius?

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