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Koutsoyiannis, D., A. Efstratiadis, N. Mamassis, and A. Christofides, On the credibility of climate predictions, Hydrological Sciences Journal, 53 (4), 671–684, 2008.
[doc_id=864]
[English]
Geographically distributed predictions of future climate, obtained through climate models, are widely used in hydrology and many other disciplines, typically without assessing their reliability. Here we compare the output of various models to temperature and precipitation observations from eight stations with long (over 100 years) records from around the globe. The results show that models perform poorly, even at a climatic (30-year) scale. Thus local model projections cannot be credible, whereas a common argument that models can perform better at larger spatial scales is unsupported.
New Study Increases Concerns About Climate Model Reliability
Date:
December 12, 2007
Source:
Wiley-Blackwell
Summary:
A new study comparing the composite output of 22 leading global climate models with actual climate data finds that the models do an unsatisfactory job of mimicking climate change in key portions of the atmosphere. This research raises new concerns about the reliability of models used to forecast global warming.
...
"The usual discussion is whether the climate model forecasts of Earth's climate 100 years or so into the future are realistic," said the lead author, Dr. David H. Douglass from the University of Rochester. "Here we have something more fundamental: Can the models accurately explain the climate from the recent past? "It seems that the answer is no."
Scientists from Rochester, the University of Alabama in Huntsville (UAH) and the University of Virginia compared the climate change "forecasts" from the 22 most widely-cited global circulation models with tropical temperature data collected by surface, satellite and balloon sensors. The models predicted that the lower atmosphere should warm significantly more than it actually did.
...
Global Climate Models and Their Limitations
Anthony Lupo (USA)
William Kininmonth (Australia)
Contributing: J. Scott Armstr
ong (USA), Kesten Green (Australia)
...
This chapter begins with a brief review of the inner workings and limitations of climate models. Climate models are important tools utilized to advance our understanding of current and past climate. They also provide qualitative and quantitative information about potential future climate. But in spite of all their sophistication, they remain merely models. They represent simulations of the real world, constrained by their ability to correctly capture and portray each of the important processes that operate to affect climate. Notwithstanding their complexities, the models remain deficient in many aspects of their portrayal of the climate, which reduces their ability to provide reliable simulations of future climate.
...
Orographic cloud in a GCM: the missing cirrus
Journal Climate Dynamics
Publisher Springer Berlin / Heidelberg
ISSN 0930-7575 (Print) 1432-0894 (Online)
Issue Volume 24, Numbers 7-8 / June, 2005
DOI 10.1007/s00382-005-0020-9
Pages 771-780
Subject Collection Earth and Environmental Science
SpringerLink Date Monday, May 02, 2005
PDF (702.7 KB)HTMLFree Preview
Orographic cloud in a GCM: the missing cirrus
S. M. Dean1 , B. N. Lawrence2, R. G. Grainger1 and D. N. Heuff3
(1) Atmospheric Oceanic and Planetary Physics, Clarendon Laboratory, University of Oxford, Oxford, Oxfordshire, UK
(2) British Atmospheric Data Centre, Rutherford Appleton Laboratory, Chilton, Oxfordshire, UK
(3) Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand
Received: 13 September 2004 Accepted: 25 February 2005 Published online: 27 April 2005
Abstract Observations from the International Satellite Cloud Climatalogy Project (ISCCP) are used to demonstrate that the 19-level HadAM3 version of the United Kingdom Met Office Unified Model does not simulate sufficient high cloud over land. By using low-altitude winds, from the European Centre for Medium Range Weather Forecasting (ECMWF) Re-Analysis from 1979 to 1994 (ERA-15) to predict the areas of maximum likelihood of orographic wave generation, it is shown that much of the deficiency is likely to be due to the lack of a representation of the orographic cirrus generated by sub-grid scale orography. It is probable that this is a problem in most GCMs.
A mysterious phenomenon is causing four major glaciers in the Antarctic to shrink in unison, causing a significant increase in sea levels, scientists have found.
The rise in atmospheric temperatures caused by global warming cannot account for the relatively rapid movement of the glaciers into the sea, but scientists suspect that warmer oceans may be playing a role.
"There is a possibility that heat from the ocean is somehow flowing in underneath these glaciers, but it is not related to global warming," said glaciologist Duncan Wingham of University College London. "Something has changed that is causing these glaciers to shrink.
"At this rate the glaciers will all be afloat in 150 years or so."
...
However, it would take about 200 years for extra heat from the ocean to reach the underside of the glaciers, which makes it difficult to believe that the present shrinkage is due to global warming, Dr Wingham said.
originally posted by: BlueShaman
The problem is that the recorded history of temperatures and ice thickness is just a speck when compared to the planet's age, which is currently estimated to be 4.6 billion years old.
For all we know, 36 degrees hotter than 'usual' may very well be normal.
originally posted by: 191stMIDET
We are in the middle of a polar shift. It happens every 750,000,000 years or so and the last one was 780,000,000 thousand years ago, so we are definetly due for another one. Many people feared a polar shift would be a quick capsizing motion wich would basically destroy everything but as it turns out Polar shifts are more gradual maybe as long as a decade for the change to happen. 780k years ago Antarctica was on the equator. Interesting times we live in.
originally posted by: ThingsThatDontMakeSenseMaybe the 2012 prediction about the end of the world was true.
We just didn't realize 2012 was the beginning of the end.
originally posted by: jrod
a reply to: TKDRL
Are you aware of what the actual scientists, science, the data have to say about this?
Do you truly believe the rise in CO2 we are observing is caused by something else besides human activity?
I dont think so, all you have is an uninformed opinion....an ignorant opinion.
Said poster has a history of flooding climate change threads with pure BS, but it sounds good to an ignorant reader. Take the time to look at past threads and maybe you will understand where I am coming from.
originally posted by: jrod
a reply to: alphabetaone
I have none that matter, however I will link good information from credible information on pertinent threads. This is a dead thread, any relevant information will be drowned away now on page 7 of this thread and will not waste my time here beating a dead horse.
Use the search feature or scroll through the Fragile Earth forum if you actually want to examine this topic on your own.
Skepticalscience.com is a good start....
originally posted by: Kalixi
An inconvenient truth that the Climate patrol don't report on is that the Antarctic ice cap is currently growing.
36 degrees warmer - I'm calling alarmist BS on this one
originally posted by: Kalixi
An inconvenient truth that the Climate patrol don't report on is that the Antarctic ice cap is currently growing.
36 degrees warmer - I'm calling alarmist BS on this one
An inconvenient truth that the Climate patrol don't report on is that the Antarctic ice cap is currently growing.
originally posted by: Phage
a reply to: Kalixi
An inconvenient truth that the Climate patrol don't report on is that the Antarctic ice cap is currently growing.
Perhaps you could be more specific. But no, not really. Last summer's (southern winter) sea ice extent in Antartica set a record. But guess what? It is currently lower than ever recorded.
www.cnn.com...
originally posted by: Kalixi
An inconvenient truth that the Climate patrol don't report on is that the Antarctic ice cap is currently growing.
36 degrees warmer - I'm calling alarmist BS on this one
And the fact that the Antarctic is growing
originally posted by: Phage
a reply to: Riffrafter
And the fact that the Antarctic is growing
Questionable.
I realized I wasn't specific in my original post and changed it to extent sea ice while you were posting this.
Primarily it has to do with the fact that Antarctica is a continental land mass and the Arctic is an ocean. Beyond that, it has to do with the fact that the Arctic Ocean is surrounded by very large land masses and Antarctica is surrounded by a lot of water. They are two very different situations which show different reactions to the overall warming of the atmosphere and oceans.
But speaking of which, what are your thoughts re: differences between North & South.