Ocean temps, sea level increases 50% higher then previously thought
June 20, 2008
New research suggests that ocean temperature and associated sea level increases between 1961 and 2003 were 50% larger than estimated in the 2007 Intergovernmental Panel on Climate Change report.
The results are reported in the June 19 edition of the journal Nature. An international team of researchers, including Lawrence Livermore National Laboratory climate scientist Peter Gleckler, compared climate models with improved observations that show sea levels rose by 1.5 mm per year in the period from 1961-2003. That equates to an approximately 2½-inch increase in ocean levels in a 42-year span.
The ocean warming and thermal expansion rates are more than 50% larger than previous estimates for the upper 300 m of oceans.
The research corrected for small but systematic biases recently discovered in the global ocean observing system, and uses statistical techniques that “infill” information in data-sparse regions. The results increase scientists’ confidence in ocean observations and further demonstrate that climate models simulate ocean temperature variability more realistically than previously thought.
“This is important for the climate modeling community because it demonstrates that the climate models used for assessing sea-level rise and ocean warming tie in closely with the observed results,” Gleckler said.
Climate model data were analyzed from 13 different modeling groups. All model data were obtained from the WCRP CMIP3 multi-model dataset archived at the LLNL’s Program for Climate Model Diagnosis and Intercomparison (PCMDI).
Although observations and models confirm that recent warming is greatest in the upper ocean, there are widespread observations of warming deeper than 700 m.
Results were compared with recent estimates of other contributions to sea-level rise including glaciers, ice caps, Greenland and Antarctic ice sheets, and thermal expansion changes in the deep ocean. When these independent lines of evidence are examined collectively, the story is more consistent than found in earlier studies.
The oceans store more than 90% of the heat in the Earth’s climate system and act as a temporary buffer against the effects of climate change. The ocean warming and thermal expansion rates are 50% larger than previous estimates for the upper 700 m of oceans, and greater than that for the upper 300 m.
“This is just the tip of the iceberg, so to speak,” Gleckler says. “Our ability to quantify structural uncertainties in observationally based estimates is critically important. This study represents important progress.”
The team involved researchers from the Centre for Australian Weather and Climate Research (CSIRO), the Antarctic Climate and Ecosystems Cooperative Research Centre and LLNL.
Founded in 1952, Lawrence Livermore National Laboratory is a national security laboratory, with a mission to ensure national security and apply science and technology to the important issues of our time. Lawrence Livermore National Laboratory is managed by Lawrence Livermore National Security, LLC for the U.S. Department of Energy's National Nuclear Security Administration.
