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Climate report links global warming and extreme weather

‘There is no standstill in global warming … The laws of physics are non-negotiable’

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Will this year bring the next spike in global temperatures?

By Summit Voice

 

FRISCO — Some of the weather extremes in 2013 were consistent with the effects of human-caused global warming, according to the annual climate statement from the World Meteorological Organization.

The report confirmed that 2013 tied with 2007 as the sixth warmest on record, continuing the long-term global warming trend. Thirteen of the fourteen warmest years on record have all occurred in the 21st century, and each of the last three decades has been warmer than the previous one, culminating with 2001-2010 as the warmest decade on record.

The average global land and ocean surface temperature in 2013 was 58.1 degrees Fahrenheit, 0.90 degrees Fahrenheit above the 1961–1990 average and 0.05 degrees Fahrenheit higher than the 2001–2010 decadal average. Temperatures in many parts of the southern hemisphere were especially warm, with Australia having its hottest year on record and Argentina its second hottest.

“We saw heavier precipitation, more intense heat, and more damage from storm surges and coastal flooding as a result of sea level rise – as Typhoon Haiyan so tragically demonstrated in the Philippines,” said WMO Secretary-General Michel Jarraud. “There is no standstill in global warming. The warming of our oceans has accelerated, and at lower depths. More than 90 percent of the excess energy trapped by greenhouse gases is stored in the oceans. Levels of these greenhouse gases are at record levels, meaning that our atmosphere and oceans will continue to warm for centuries to come. The laws of physics are non-negotiable,” Jarraud said.

The report includes a peer-reviewed case study into Australia’s record warmth in 2013. The study by scientists at the ARC Centre of Excellence for Climate System Science University of Melbourne, Australia, used nine state-of-the-art global climate models to investigate whether changes in the probability of extreme Australian summer temperatures were due to human influences.

“Comparing climate model simulations with and without human factors shows that the record hot Australian summer of 2012-2013 was about five times as likely as a result of human-induced influence on climate and that the record hot calendar year of 2013 would have been virtually impossible without human contributions of heat-trapping gases, illustrating that some extreme events are becoming much more likely due to climate change,” the study concluded.

WMO’s statement, which is an internationally recognized authoritative source of information, highlights the key climate events of 2013:

  • Typhoon Haiyan (Yolanda), one of the strongest storms to ever make landfall, devastated parts of the central Philippines.
  • Surface air temperatures over land in the Southern Hemisphere were very warm, with widespread heat waves; Australia saw record warmth for the year, and Argentina its second warmest year and New Zealand its third warmest.
  • Frigid polar air plummeted into parts of Europe and the southeast United States.
  • Angola, Botswana and Namibia were gripped by severe drought.
  • Heavy monsoon rains led to severe floods on the India-Nepal border.
  • Heavy rains and floods impacted northeast China and the eastern Russian Federation.
  • Heavy rains and floods affected Sudan and Somalia.
  • Major drought affected southern China.
  • Northeastern Brazil experienced its worst drought in the past 50 years.
  • The widest tornado ever observed struck El Reno, Oklahoma in the United States.
  • Extreme precipitation led to severe floods in Europe’s Alpine region and in Austria, Czech Republic, Germany, Poland, and Switzerland.
  • Israel, Jordan, and Syria were struck by unprecedented snowfall.
  • Greenhouse gas concentrations in the atmosphere reached record highs.
  • The global oceans reached new record high sea levels.
  • The Antarctic sea ice extent reached a record daily maximum.

The global temperature assessment is based on three independent datasets that are maintained by the Met Office Hadley Centre and the Climatic Research Unit of the University of East Anglia (HadCRU), both in the United Kingdom; the National Climatic Data Center of the National Oceanic and Atmospheric Administration (NCDC NOAA), based in the United States; and the Goddard Institute for Space Studies (GISS) operated by the National Aeronautics and Space Administration (NASA), also in the United States.

“Weather forecasting, including of storms and other hazards, has become much more skilful in recent years. As demonstrated in October by Cyclone Phailin, the second strongest tropical cyclone to strike India since modern records began, improved forecasting, combined with government action to build national resilience and provide shelters, greatly reduces the loss of life. We must continue strengthening preparedness and early warning systems and implementing a multi-hazard approach to disaster risk reduction,” he said.

Copies of both the summary report and the full report will be available on the www.wmo.int website

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