41
votes
Accepted
Does this peer-reviewed study (referenced in Forbes) contradict the accepted position that climate change is real?
I want to know if that article has been refuted anywhere
Yes. You can read all about it in the blog post
James Taylor misinterprets study by 180 degrees.
In short, the original paper was designed ...
- 23.1k
17
votes
Accepted
Looking for evidence against some points raised in Ivar Giaever's speech on climate change
Ivar's graph is mischievous in trying to imply that there should be an exact correlation. The global air temperature is not a good parameter to chart against CO2 emissions because the increasing heat ...
- 14.2k
17
votes
Why don't errors accumulate in climate models when the time horizon increases?
Error does accumulate in climate models out into the future -- that's why the forecasts include a range of possible results, that gets wider the further into the future you look.
See, for instance, ...
- 1,400
16
votes
Accepted
"The world will start COOLING DOWN in 2017"?
I gave a longer answer linked to a similar question in the comments above, I'll give a quick one here:
There's a story going around the low-grade news factories that one Dr.
David Evans . . .
...
- 5,847
13
votes
Accepted
Looking for the mathematics so I can run climate change simulations
Full scale climate models
The atmospheric climate simulations that are presented in the IPCC reports are performed by quite large and complex models. Running these models needs a "supercomputer&...
- 2,661
11
votes
What exactly is a model grid?
A model is a simplified representation of a system.
Rather than try to model everything down to the microscopic level, or as vectors, we often aggregate phenomena across geographic areas, to simplify ...
- 4,090
11
votes
Accepted
What caused peak CO2 to rise, starting about 400,000 years ago?
First things first: There's nothing per se wrong in science with answering "We don't know" to a vexing problem. This might well be one of those cases.
The question you are asking was asked by Imbrie ...
- 23.2k
10
votes
Accepted
How to calculate w-wind?
Omega, ω is closely related to w in meteorology.
It can be moved towards w using the chain (this reminder from Watkins at SJSU helped)...
...
- 8,713
10
votes
Accepted
How is global greenhouse gas emission calculated?
Your question is simple enough, but the answer depends on what exactly you're looking for.
Who is emitting where right now?
Real-time global monitoring of greenhouse gas emissions with a high ...
- 11.6k
10
votes
Why don't errors accumulate in climate models when the time horizon increases?
There is a huge confusion between errors in weather forecasting and climate prediction.
While weather predictability is fundamentally limited to a few weeks, in climate modelling we are interested in ...
10
votes
What is technically wrong with Wijngaarden & Happer's paper claiming to show that CO2's contribution to surface warming is saturated?
To answer the original question about CO2 saturation, I'll describe spectral absorption. Each gas in the atmosphere absorbs light at specific wavelengths, and some wavelengths are absorbed more than ...
- 101
9
votes
Accepted
Interpolate Gaussian grids to regular fixed grids using bilinear interpolation?
climate data operators (CDO)
define grid
We define a lat-lon target grid with 1°x1° grid cell size 30x30 grid cells starting at 40°N and -10°E (=10°W):
...
- 2,661
9
votes
Accepted
Would adding sulfur dioxide to the atmosphere have a global cooling effect?
There have been a range of studies on the issue published in Atmospheric Chemistry and Physics and other scientific journals.
The short answer is "yes." The longer answer is "yes, but...."
In ...
- 3,494
9
votes
Accepted
How to run earth system, land surface and climate models?
As alluded to in some of the comments, all of the CMIP5 models will have been run on supercomputers, and it takes a lot of effort to get one of them running on a new platform, even for a team who know ...
- 3,940
9
votes
Why is a future increase in solar luminosity by 10% supposed to have disastrous consequences for life on earth when the last 30% did not?
In this regard you can think that the Earth system is like a house with heating but no Air conditioning. Therefore, it has a powerful mechanism to stay warm when the solar illumination is weak (...
- 17.6k
9
votes
How is global greenhouse gas emission calculated?
I can imagine a satellite observation-based model that calculates
emissions on a spatial basis but I am not sure if our technology is
advanced enough to do that accurately.
It is. The first ...
- 7,729
8
votes
Looking for evidence against some points raised in Ivar Giaever's speech on climate change
Temperature differences y/y are very small compared to natural variation during the year
This is only saying that we have a large seasonal cycle. It says nothing about low-frequency variations. Once ...
- 101
8
votes
Accepted
North Atlantic Oscillation (NAO) future prediction - Academic papers?
A good start is the article by Goodkin et al. (2008) that relates past fluctuations of NAO to climate variability and argues that in the late 20th century NAO changes are much more dramatic as a ...
- 15.4k
8
votes
Accepted
Kalman - Data assimilation with external model
$M$ is the forward model you are using. It is the dynamical model used to solve whatever discrete equation evolves the field ($d?/dt=$).
The best way to start with data assimilation and understand ...
- 15.4k
8
votes
Accepted
Confusion with precipitation values in CORDEX MPI-ESM rcp data
TLDR;
The precipitation values (and possibly some other variables; see below) need to be divided by 24.
Background
The global attributes of the netCDF file in the question provide an URL to a ...
- 2,661
8
votes
Accepted
difference between different meteorological models
In general, the relation between the three datasets is as follows:
The simulation model is initiated with a set of boundary and initial conditions, and will on the long-term provide good mean ...
- 163
8
votes
Accepted
Where can I find detailed description of different VARIANT-IDs in CMIP6 metadata?
The variant_labels are defined in the CMIP6 Data Reference Syntax (DRS) document and are made up of the realization_index, initialization_index, physics_index and forcing_index.
A link to this DRS ...
- 96
7
votes
Looking for evidence against some points raised in Ivar Giaever's speech on climate change
Temperature differences y/y are very small compared to natural
variation during the year, and the trend we see could be statistical
illusion, especially that the scientists who developed the ...
- 1,959
7
votes
Are we now and/or have we been in the RCP8.5 scenario?
In short, I would say that it is too soon to say. But, if I were forced to guess: I would indeed incline to say that we live in a RCP 8.5-ish scenario.
I'm not an expert at all on climate models or ...
- 17.6k
7
votes
How to run earth system, land surface and climate models?
We are moving all of CESM to open source - in particular here is the latest version of the Community Terrestrial Systems Model (CTSM)
https://github.com/ESCOMP/ctsm
Formerly known as CLM, CTSM ...
- 71
7
votes
Are we at the beginning of a Heinrich Event?
Definitely not.
A Heinrich event requires massive ice sheets to grow and then collapse in the Northern hemisphere. The large outflow of icebergs that would result form such collapse would deliver ...
- 17.6k
7
votes
About the actual radiative impact of greenhouse gas emission over time
There is no doubt that the sooner the mitigation effort happens, the greater will be its impact.
In other words, the impact on year 2100 climate of the sequestration of 20 billion tons $\ce{CO2}$-eq ...
- 17.6k
7
votes
Accepted
Why is it that "With higher CO2, the dry gets drier and the wet gets wetter"?
To my best knowledge, the paper by Held & Soden (2006) is the first paper that discussed the concept of the rich get richer. They used the climate change experiments generated for the Fourth ...
- 215
7
votes
Accepted
Geotiff for Elevation Data or NetCDF
'Better' will depend on your planned usage - any global product will have limitations in terms of overall accuracy and precision, and both the Aster photogrammetric data and the widely used radar SRTM ...
- 2,010
6
votes
Accepted
Need different temperature change data sets explained
There are several climate datasets around the world, two in America - NASA's GISTEMP, and NOAA's MLOST, and one in the UK - HadCRUT. These are the main datasets but there are others around the world, ...
- 14.2k
Only top scored, non community-wiki answers of a minimum length are eligible