Belfast Telegraph

Friday 29 August 2014

Global temperature rises 'slowing'

The Met Office said temperatures are likely to be between 0.28C and 0.59C above the 1971-2000 average in 2013-2017

Global temperatures are likely to rise slightly less than predicted over the next few years, according to new modelling from the Met Office.

Temperatures are likely to be between 0.28C and 0.59C above the 1971-2000 average in 2013-2017, and are most likely to be around 0.43C above the long-term average, the latest analysis suggests.

Updated figures are slightly lower than the 0.54C above average that was predicted for 2012-16, with the changes being a result of improved modelling, the Met Office said.

The fact that the new model predicts less warming globally over the next five years than previously forecast does not necessarily say anything about long-term predictions of climate change this century, the Met Office said.

Forecasts of continued global warming are driven largely by increasing levels of greenhouse gases.

Experts warn that without efforts to reduce greenhouse gases, the world is on course for temperature rises of 3C to 5C this century alone.

Scientists at the Met Office are researching potential causes of the recent slowdown in global warming, including natural variability in temperatures, fluctuations in solar activity and the short-term influence of sulphate aerosol emissions.

Over the last 140 years global surface temperatures have risen by about 0.8C but there have been periods of a decade or more when temperatures have risen only slowly, or even cooled.

The current slowdown in warming is not unprecedented, the Met Office pointed out.

Although the hottest year in Met Office records was 1998, at 0.4C above the 1971-2000 average, each recent decade has been warmer overall than the previous, so that the 2000s were hotter than the 1990s which were warmer than the 1980s. The record temperatures in 1998 were due to the strong El Nino weather phenomenon in the Pacific Ocean that year, which raises global temperatures.

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