Posted on 07/11/2002 10:29:18 AM PDT by cogitator
Livermore [Scientists] Create Highest Resolution Global Climate Map To Date
Livermore - Jul 11, 2002 Atmospheric scientists from Lawrence Livermore National Laboratory have performed the first global climate simulations with spatial resolutions of roughly 50 km (30 miles). This capability will be used to assess climate change and its societal impacts.
Typical global climate simulations use spatial resolutions of about 300 kilometers (186 miles), which limits their ability to simulate climate and climate change on a regional scale. For example, with these lower resolutions it is difficult to assess climate changes, and the resulting societal impacts, in the climatically varying regions within California.
The high-resolution global climate simulations were run on a number of large computers at LLNL and on two machines at the Department of Energy's National Energy Research Supercomputer Center (NERSC).
The 50 km global model has 32 times more grid cells and requires about 200 times more computer processing time than comparable models at 300-km resolution.
"While higher resolutions have been used in weather prediction simulations before, those typically only cover several days," said Philip Duffy, group leader of LLNL's Climate System Modeling Group in the Atmospheric Science Division and key author of a paper on the subject. "Livermore's climate simulations span years."
A two-part paper describing the results has been submitted to Climate Dynamics. Co-authors include LLNL researchers Bala Govindasamy, Jose Milovich, Karl Taylor, Michael Wehner and Starley Thompson.
The high-resolution global climate simulations have been funded in part by the LLNL Laboratory-Directed Research and Development (LDRD) Program, and in part by the DOE's Climate Change Prediction Program.
The 50-km resolution simulations more closely mirror the present climate than do comparable coarse-resolution simulations, Duffy said. Researchers from Livermore's Program for Climate Model Diagnosis and Intercomparison (PCMDI) compared the high-resolution present climate simulations to observations and to results of simulations at coarse resolution (300 km).
They found significantly more agreement between the model results and observations, indicating that increasing the resolution brings very significant improvements in the model's ability to simulate large-scale features of climate.
To show the effects of greenhouse gases on future climate, Livermore researchers ran models at 300-km and 75-km resolutions. Because they represent a possible future climate, the model results cannot be evaluated by comparing them to observations. The results indicate that globally averaged climate changes are very similar in the 75-km and 300-km models. However predicted climate changes in specific geographical regions can be very different at the finer resolution.
"Our higher resolution global climate simulations can be used to provide information on many of the most important societal impacts of climate changes, such as the impacts on waster resource management, agriculture and human health," Duffy said. "We hope to improve the realism of the models and produce better predictions of future climate on both global and regional scales."
"The 50-km resolution simulations more closely mirror the present climate than do comparable coarse-resolution simulations, Duffy said. Researchers from Livermore's Program for Climate Model Diagnosis and Intercomparison (PCMDI) compared the high-resolution present climate simulations to observations and to results of simulations at coarse resolution (300 km)."
It stands to reason that higher-resolution models will be closer to "reality". Because at the end limit, the highest resolution = reality.
Right?
They think a 50 klick pixel size is "high resolution". Ha. The bottom of the arroyo in back of my house, 50 yards away, has a different climate than my house on the hill. All you have to do is walk down the hill in the morning and feel the drastic humidity and temperature change.
These idiots will never build a reliable simulation of climate. They can't even predict the weather tonight.
It's higher resolution than 300 km, of course.
It must be the latter. And since they are presumably driving both simulations with the same (300-km resolution) data, they can't possibly get any large scale changes unless their previous methodology was critically flawed to begin with.
Not in politics. the highest resolution = political gain.
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