The following is a repost from the UK's Met Office Website. It's about three scientific reports that take a closer look at the alleged "pause" in global surface temperatures - it's the story that certain media outlets and "free market think tanks" are relentlessly pushing, despite it's misleading nature.
For those who are curious about the full story behind claims of a pause in global warming this is must reading.
Met Office
http://www.metoffice.gov.uk/research/news/recent-pause-in-warming
(Last Updated: 30 September 2013 )
July 2013 - Global mean surface temperatures rose rapidly from the 1970s, but have been relatively flat over the most recent 15 years to 2013. This has prompted speculation that human induced global warming is no longer happening, or at least will be much smaller than predicted. Others maintain that this is a temporary pause and that temperatures will again rise at rates seen previously.
The Met Office Hadley Centre has written three reports that address the recent pause in global warming and seek to answer the following questions:
- What have been the recent trends in other indicators of climate over this period?
- What are the potential drivers of the current pause?
The first paper shows that a wide range of observed climate indicators continue to show changes that are consistent with a globally warming world, and our understanding of how the climate system works.
- How does the recent pause affect our projections of future climate?
The second suggests that it is not possible to explain the recent lack of surface warming solely by reductions in the total energy received by the planet, i.e. the balance between the total solar energy entering the system and the thermal energy leaving it. Changes in the exchange of heat between the upper and deep ocean appear to have caused at least part of the pause in surface warming, and observations suggest that the Pacific Ocean may play a key role.
The final paper shows that the recent pause in global surface temperature rise does not materially alter the risks of substantial warming of the Earth by the end of this century. Nor does it invalidate the fundamental physics of global warming, the scientific basis of climate models and their estimates of climate sensitivity.
Links to each of the three papers are below.
Paper 1: Observing changes in the climate system (PDF, 2 MB)Contents
Executive summary
Our changing climate
Atmosphere
Atmospheric composition – carbon dioxide
Near surface air temperature
Lower tropospheric temperature
Stratospheric temperature
Atmospheric water vapour
Cryosphere
Arctic sea-ice extent
Glacier mass balance
Northern Hemisphere snow cover
Ocean
Ocean heat content
Sea level rise
Concluding remarks
Acknowledgements
References
Paper 2: Recent pause in global warming (PDF, 1 MB)
Contents
Executive summary
1. Pauses in global warming: Is the current lack of warming unusual?
2. Understanding potential cause of recent pause in global surface temperature rise
2.1 Changes in incoming energy
2.2 Redistribution of energy within the climate system –
Storing the heat below the surface
Storing the heat below the surface
2.3 What do we know about changes in the ocean heat budget?
Concluding remarks
Acknowledgements
References
Paper 3: Implications for projections (PDF, 663 kB)
Contents
Executive summary
Executive summary
Context
Measures of climate sensitivity
Transient Climate Response
Estimates of Transient Climate Response from comprehensive climate models
Estimates of Transient Climate Response from observations
Estimates of Transient Climate Response - studies combining comprehensive climate models and observations
Summary of TCR estimates and the impact on warming to 2100
Equilibrium climate sensitivity (ECS) and stabilisation of climate change
Concluding remarks
Acknowledgements
References
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