Changes in net flow of ocean heat correlate with past climate anomalies
August 14, 2009
Topographic/bathymetric map of the Indian Ocean region. Image: Wikimedia Commons
Physicists at the University of Rochester have combed through data from satellites and ocean buoys and found evidence that in the last 50 years, the net flow of heat into and out of the oceans has changed direction three times.
These shifts in the balance of heat absorbed from the sun and radiated from the oceans correlate well with past anomalies that have been associated with abrupt shifts in the earth's climate, say the researchers. These anomalies include changes in normal storm intensities, unusual land temperatures, and a large drop in salmon populations along the western United States.
The physicists also say these changes in ocean heat-flow direction should be taken into account when predicting global climate because the oceans represent 90 percent of the total heat in the earth's climate system.
The study, which will appear in an upcoming issue of Physics Letters A, differs from most previous studies in two ways, the researchers say. First, the physicists look at the overall heat content of the Earth's climate system, measuring the net balance of radiation from both the sun and Earth. And second, it analyzes more completely the data sets the researchers believe are of the highest quality, and not those that are less robust.
"These shifts happened relatively abruptly," says David Douglass, professor of physics at the University of Rochester, and co-author of the paper. "One, for example, happened between 1976 and 1977, right when a number of other climate-related phenomenona were happening, such as significant changes in U. S. precipitation."
Douglass says the last oceanic shift occurred about 10 years ago, and that the oceans are currently emitting slightly more radiation than they are receiving.
The members of the team, which includes Robert Knox, emeritus professor of physics at the University, believe these heat-flux shifts had previously gone unnoticed because no one had analyzed the data as thoroughly as the Rochester team has.
The team believes that the oceans may change how much they absorb and radiate depending on factors such as shifts in ocean currents that might change how the deep water and surface waters exchange heat. In addition to the correlation with strange global effects that some scientists suspect were caused by climate shifts, the team says their data shows the oceans are not continuously warming—a conclusion not consistent with the idea that the oceans may be harboring "warming in the pipeline." Douglass further notes that the team found no correlation between the shifts and atmospheric carbon dioxide concentration.
"An interesting aspect of this research is that no reference to the surface temperature itself is needed," says Knox. "The heat content data we used, gathered by oceanographers, was gleaned from temperature measurements at various ocean depths up to 750 meters." The team also found that the radiative imbalance was sufficiently small that it was necessary to consider the effect of geothermal heating. Knox believes this is the first time this additional source of heat has been accounted for in such a model.
The team notes that it's impossible to predict when another shift might occur, but they suspect future shifts might be similar to the three observed. Both Douglass and Knox are continuing to analyze various climate-related data to find any new information or correlations that may have so far gone unnoticed.
5 hours ago
the only information on how much aggregate heat is coming from the ocean floor to the bottom of the actual ocean is EXTREMELY LIMITED.
this seems like such an obvious fact to the layperson that , one wonders how scientists can draw any seeming conclusions when the certainty about the lack of information we yet possess is so high.
it remains a great challenge to collect all this data as well. as far as i know, sattelites cannot gather this information. the only way to know is to sample the bottom of the ocean by going there, many times and in many locations.
also, statistically, hot spots tend to occur in clusters, so it could be that 90% of the occean heat comes from the bottom of the ocean, and 90% of this heat comes from 10 relatively small hot-regions around the world ( some of which would presumably be aligned around the pacific ring of fire.....
, so we cannot really make good conclusions until we really have heat mapped 95 to 99%all of the bottom of the oceans.
Care to Guess?
Multiple planetary conjunctions.
I kid you not. This created a tidal effect few could fathom within the liquid core of all of us, including the star. Ask why the star is so quiet now?
It is simple physics where we will eventually find the key to understanding global climate. We will find the sun, moon and our neighbors have far more to do with the temperature then anything Gore and his brethren at the UN could ever conceive. As soon as scientist stop drinking the tap water in Washington we will all be better off...
If your car has a complicated problem with it, you don't just take it to the mechanic and let him diagnose it without running tests, taking data, and using past experience to evaluate the solution. If he makes you repair every single part one by one, until he gets to the actual part needing repair, he is selling an inefficient solution based on incomplete sets of inexperience and likely guesstimation.
Give me your real time sensor data, your educated intuition, your analyzed core samples; anything that is a fortified and redundant compilation of the evidence to the problem, and the world can work diligently to develop an appropriate solution.
Counting up carbon credits, ppm, global averages and predicting long term weather patterns are inconclusive, misunderstood, and highly unprofessional.
If we yell wolf too many times, we won't get the real-time support one needs to politically/scientifically tackle a problem.
Don't lay your idle, inexperienced, and nervous hand on my delicate engine, we need professionals working on it. Do it right the first time.
Anomalies assumes that we know how the earth works....