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Sea levels rising faster than IPCC projections

Date:
November 28, 2012
Source:
Institute of Physics
Summary:
Sea levels are rising 60 per cent faster than the Intergovernmental Panel on Climate Change's central projections, new research suggests. While temperature rises appear to be consistent with the projections made in the IPCC's fourth assessment report (AR4), satellite measurements show that sea levels are actually rising at a rate of 3.2 mm a year compared to the best estimate of 2 mm a year in the report.

Sea-levels are rising 60 per cent faster than the Intergovernmental Panel on Climate Change's (IPCC) central projections, new research suggests.
Credit: © byheaven / Fotolia

Sea levels are rising 60 per cent faster than the Intergovernmental Panel on Climate Change's (IPCC) central projections, new research suggests.

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While temperature rises appear to be consistent with the projections made in the IPCC's fourth assessment report (AR4), satellite measurements show that sea levels are actually rising at a rate of 3.2 mm a year compared to the best estimate of 2 mm a year in the report.

The researchers, from the Potsdam Institute for Climate Impact Research, Tempo Analytics and Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, believe that findings such as these are important for keeping track of how well past projections match the accumulating observational data, especially as projections made by the IPCC are increasingly being used in decision making.

The study, which has been published November 28, in IOP Publishing's journal Environmental Research Letters, involved an analysis of global temperatures and sea-level data over the past two decades, comparing them both to projections made in the IPCC's third and fourth assessment reports.

Results were obtained by taking averages from the five available global land and ocean temperature series.

After removing the three known phenomena that cause short-term variability in global temperatures -- solar variations, volcanic aerosols and El Nino/Southern Oscillation -- the researchers found that the overall warming trend at the moment is 0.16°C per decade, which closely follows the IPCC's projections.

Satellite measurements of sea levels showed a different picture, however, with current rates of increase being 60 per cent faster than the IPCC's AR4 projections.

Satellites measure sea-level rise by bouncing radar waves back off the sea surface and are much more accurate than tide gauges as they have near-global coverage; tide gauges only sample along the coast. Tide gauges also include variability that has nothing to do with changes in global sea level, but rather with how the water moves around in the oceans, such as under the influence of wind.

The study also shows that it is very unlikely that the increased rate is down to internal variability in our climate system and also shows that non-climatic components of sea-level rise, such as water storage in reservoirs and groundwater extraction, do not have an effect on the comparisons made.

Lead author of the study, Stefan Rahmstorf, said: "This study shows once again that the IPCC is far from alarmist, but in fact has under-estimated the problem of climate change. That applies not just for sea-level rise, but also to extreme events and the Arctic sea-ice loss."


Story Source:

The above story is based on materials provided by Institute of Physics. Note: Materials may be edited for content and length.


Journal Reference:

  1. Stefan Rahmstorf, Grant Foster, Anny Cazenave. Comparing climate projections to observations up to 2011. Environmental Research Letters, 2012; 7 (4): 044035 DOI: 10.1088/1748-9326/7/4/044035

Cite This Page:

Institute of Physics. "Sea levels rising faster than IPCC projections." ScienceDaily. ScienceDaily, 28 November 2012. <www.sciencedaily.com/releases/2012/11/121128093911.htm>.
Institute of Physics. (2012, November 28). Sea levels rising faster than IPCC projections. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2012/11/121128093911.htm
Institute of Physics. "Sea levels rising faster than IPCC projections." ScienceDaily. www.sciencedaily.com/releases/2012/11/121128093911.htm (accessed October 31, 2014).

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