From: ScienceDaily
Published June 12, 2012 07:11 AM

Global Warming over last 50 yrs caused primarily by human activity

The oceans have warmed in the past 50 years, but not by natural events alone.

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New research by a team of Lawrence Livermore National Laboratory scientists and international collaborators shows that the observed ocean warming over the last 50 years is consistent with climate models only if the models include the impacts of observed increases in greenhouse gas during the 20th century.
Though the new research is not the first study to identify a human influence on observed ocean warming, it is the first to provide an in-depth examination of how observational and modeling uncertainties impact the conclusion that humans are primarily responsible.

"We have taken a closer look at factors that influence these results," said Peter Gleckler, an LLNL climate scientist and lead author of the new study that appears in the June 10 edition of the journal, Nature Climate Change. "The bottom line is that this study substantially strengthens the conclusion that most of the observed global ocean warming over the past 50 years is attributable to human activities."

The group looked at the average temperature (or heat content) in the upper layers of the ocean. The observed global average ocean warming (from the surface to 700 meters) is approximately 0.025 degrees Celsius per decade, or slightly more than 1/10th of a degree Celsius over 50 years. The sub-surface ocean warming is noticeably less than the observed Earth surface warming, primarily because of the relatively slow transfer of ocean surface warming to lower depths. Nevertheless, because of the ocean's enormous heat capacity, the oceans likely account for more than 90 percent of the heat accumulated over the past 50 years as Earth has warmed.

Graphic shows Pacific and Atlantic Ocean zonal average cross sections (surface to 700 meters) of temperature changes for 1955 to 2011. Each globe represents a decadal average. The foreground is the most recent decade and preceding decades are in the background. Red represents warming ocean, white no change, and blue for cooling with respect to a 1957-1990 average. Data was provided from the National Oceanographic Data Centre (NODC) World Ocean Database (WOD). Graphic by Timo Bremer/LLNL.

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