TAILIEUCHUNG - IELTS Academic Reading Sample 175 - Rising Sea

Nhằm giúp các bạn có thêm tài liệu tham khảo và ôn thi tiếng Anh, mời các bạn cùng tham khảo nội dung tài liệu IELTS Academic Reading Sample 175 - Rising Sea dưới đây. Hy vọng nội dung tài liệu phục vụ hữu ích nhu cầu học tập và ôn thi. | You should spend about 20 minutes on Questions 15 - 28 which are based on Reading Passage 175 below. RISING SEA Paragraph 1 - INCREASED TEMPERATURES The average air temperature at the surface of the earth has risen this century as has the temperature of ocean surface waters. Because water expands as it heats a warmer ocean means higher sea levels. We cannot say definitely that the temperature rises are due to the greenhouse effect the heating may be part of a natural variability over a long time - scale that we have not yet recognized in our short 100 years of recording. However assuming the build up of greenhouse gases is responsible and that the warming will continue scientists and inhabitants of low-lying coastal areas would like to know the extent of future sea level rises. Paragraph 2 Calculating this is not easy. Models used for the purpose have treated the ocean as passive stationary and one -dimensional. Scientists have assumed that heat simply diffused into the sea from the atmosphere. Using basic physical laws they then predict how much a known volume of water would expand for a given increase in temperature. But the oceans are not one -dime nsional and recent work by oceanographers using a new model which takes into account a number of subtle facets of the sea including vast and complex ocean currents suggests that the rise in sea level may be less than some earlier estimates had predicted. Paragraph 3 An international forum on climate change in 1986 produced figures for likely sea-level rises of 20 cms and m corresponding to atmospheric temperature increases of and respectively. Some scientists estimate that the ocean warming resulting from those temperature increases by the year 2050 would raise the sea level by between 10 cms and 40 cms. This model only takes into account the temperature effect on the oceans it does not consider changes in sea level brought about by the melting of ice sheets and glaciers and changes in groundwater .

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