1) Connection to
global warming The model simulates an increase in Northern England precipitation in winter, but the trend is not as large as the observed one.
Not exact matches
They found no significant trends, but when they put the data into computer
models and
simulated a rise in temperature — as predicted through
global warming — the results were striking.
Although computer
models used to project climate changes from increasing greenhouse gas concentrations consistently
simulate an increasing upward airflow in the tropics with
global warming, this flow can not be directly observed.
The explanation for this could be that the
global warming is not yet strong enough to trigger the changes in precipitation patterns that climate
models simulate,» reports Charpentier Ljungqvist.
The authors compared the Paris Agreement 1.5 C
warming scenario to the currently pledged 3.5 C by using computer
models to
simulate changes in
global fisheries and quantify losses or gains.
Testing
models against the existing instrumental record suggested CO2 must cause
global warming, because the
models could not
simulate what had already happened unless the extra CO2 was added to the
model.
Yoshizaki, M., et al., 2005: Changes of Baui (Mei - yu) frontal activity in the
global warming climate
simulated by a non-hydrostatic regional
model.
The diagnostics, which are used to compare
model -
simulated and observed changes, are often simple temperature indices such as the
global mean surface temperature and ocean mean
warming (Knutti et al., 2002, 2003) or the differential
warming between the SH and NH (together with the
global mean; Andronova and Schlesinger, 2001).
Figure 3 is a similar graphic to that presented in Meehl et al. (2004), comparing the average
global surface
warming simulated by the
model using natural forcings only (blue), anthropogenic forcings only (red), and the combination of the two (gray).
... it is sometimes argued that the severity of
model - projected
global warming can be taken less seriously on the grounds that
models fail to
simulate the current climate sufficiently accurately.
On the contrary, our results add to a broadening collection of research indicating that
models that
simulate today's climate best tend to be the
models that project the most
global warming over the remainder of the twenty - first century.
We recently published a study in Scientific Reports titled Comparing the
model -
simulated global warming signal to observations using empirical estimates of unforced noise.
Yadvinder Malhi, an ecologist at Oxford specializing in the Amazon, said that nearly all climate
models simulating the impacts of
global warming show the area staying wet even as other parts of the vast basin get drier.
Kosaka and Xie made
global climate simulations in which they inserted specified observed Pacific Ocean temperatures; they found that the
model simulated well the observed
global warming slowdown or «hiatus,» although this experiment does not identify the cause of Pacific Ocean temperature trends.
Models simulate that
global mean precipitation increases with
global warming.
The uncertainty in the range of future
warming is mostly due to differences in how
models simulate changes in clouds with
global warming.
For the mid-Holocene, coupled climate
models are able to
simulate mid-latitude
warming and enhanced monsoons, with little change in
global mean temperature (< 0.4 °C), consistent with our understanding of orbital forcing.
When increasing CO2 is added, their
models can
simulate average
global warming since the 1970s.
A paper published in Nature Climate Change, Frame and Stone (2012), sought to evaluate the FAR temperature projection accuracy by using a simple climate
model to
simulate the
warming from 1990 through 2010 based on observed GHG and other
global heat imbalance changes.
So, they didn't actually
simulate sea level changes, but instead estimated how much sea level rise they would expect from man - made
global warming, and then used computer
model predictions of temperature changes, to predict that sea levels will have risen by 0.8 - 2 metres by 2100.
A number of the man - made
global warming computer
models have tried to
simulate how much «sea level rise» to expect from man - made
global warming, e.g., Meehl et al., 20015 (Abstract; Google Scholar access); Jevrejeva et al., 2010 (Abstract; Google Scholar access); Jevrejeva et al., 2012 (Abstract; Google Scholar access).
As a result of the significant scientific effort to date, aided by public concern,
models simulating climate change have gained considerable skill... There will be many scientific and technical challenges along the way, but the hope is that simulations of the
global environment will be able to maximise the number of people around the world who can adapt to, and be protected from the worst impacts of,
global warming.
However, climate
models have
simulated global surface
warming quite accurately on the whole.
Rather than questioning the primary role of the atmospheric CO2, our
modelling results allow us to put forward that the atmospheric CO2 is not the whole story and that, owing to the overwhelming effect and interplay between the paleogeography, the water cycle and the seasonal response, the climate system may undergo subtle climatic changes (as the 4 °C
global warming simulated here between the Aptian and the Maastrichtian runs).
David Keller and colleagues from the Helmholtz Centre for Ocean Research in Kiel, Germany and colleagues report in Nature Communications that they used an earth system
model to
simulate five very different strategies to reduce the rate of
global warming and keep the climate from dramatic change.
It's obvious that
global sea surfaces
simulated by the GISS climate
model were
warmer than observed and that the GISS
model warming rate is too high over the past 3 decades.
And fourth, in another new study, scientists confirmed that climate
models way overestimated
global warming for the last 20 years because... wait for it... the
models are likely unable to
simulate natural climate variation correctly.
So, one way in which the climate
models can
simulate «
global warming» is by increasing CO2 concentrations.
Testing
models against the existing instrumental record suggested CO2 must cause
global warming, because the
models could not
simulate what had already happened unless the extra CO2 was added to the
model.
Hezel and colleagues (2012), who developed a
model to project April snow depths into the 21st century to see how ringed seals might be affected by global warming, used simulated data generated by other models developed by the Climate Model Intercomparison Project (CMIP5; explained in Taylor et al. 2012); Hudson Bay, Foxe Basin and Davis Strait regions were not included in this anal
model to project April snow depths into the 21st century to see how ringed seals might be affected by
global warming, used
simulated data generated by other
models developed by the Climate
Model Intercomparison Project (CMIP5; explained in Taylor et al. 2012); Hudson Bay, Foxe Basin and Davis Strait regions were not included in this anal
Model Intercomparison Project (CMIP5; explained in Taylor et al. 2012); Hudson Bay, Foxe Basin and Davis Strait regions were not included in this analysis.
The method is somewhat circular, since forcing for each
model is calculated each year as the product of its estimated climate feedback parameter and its
simulated global warming, adjusted by the change in its radiative imbalance (heat uptake).
Dr. Jana Sillmann et al — IopScience — 18 June 2014 Observed and
simulated temperature extremes during the recent
warming hiatus «This regional inconsistency between
models and observations might be a key to understanding the recent hiatus in
global mean temperature
warming.»
17
Modeling Global Warming Computer modeling is complicated by the Earth's feedback processes that sometimes make it necessary to use different equations under changing simulated envir
Modeling Global Warming Computer
modeling is complicated by the Earth's feedback processes that sometimes make it necessary to use different equations under changing simulated envir
modeling is complicated by the Earth's feedback processes that sometimes make it necessary to use different equations under changing
simulated environments.
The researchers used data on earlier
warm periods in Earth's history to estimate climate impacts as a function of
global temperature, climate
models to
simulate global warming, and satellite data to verify ongoing changes.
Modeled regional and
global climate responses to
simulated (107, 110, 111) and reconstructed historical land cover changes over the past century (112) and millennium (113) generally agree that anthropogenic deforestation drives biogeophysical cooling at higher latitudes and
warming in low latitudes and suggest that biogeochemical impacts tend to exceed biogeophysical effects (113).
At the same time a newer
model study by Wyant et al. using superparameterization to better
simulate the behavior of clouds, also shows a
global net negative cloud feedback with
warming.
C / decade and the
simulated ensemble mean over the
models, calculated from the grid boxes of the
models where observations exist (which is flawed in my opinion, since excluding of mostly the high latitudes from the
model data may emphasize a
warm bias in lower latitudes in the
models making them appear
warmer than they are, but a possible cold bias of the
global observations data set is not excluded in this way) had a trend of 0.3 deg.
My quote referred to the assertion that there was an increasing discrepancy between observed
global temperatures and
model simulated global temperature used for the
global warming predictions presented in the IPCC report.
In paper published in 2006 in the Journal of the Meteorological Society of Japan titled, «Tropical Cyclone Climatology in a
Global -
Warming Climate as
simulated in a 20 km - Mesh
Global Atmospheric
Model: Frequency and Wind Intensity Analyses», Oouchi et al. used a high resolution GCM with 20 km grid resolution to look at the frequency of tropical cyclones late this century.
may give cause for some to question the wider role of climate change and not solely
global warming, that are induced by anthropogenic emissions, changes in land use, water quality etc for which there is direct empirical data in the form of images, and not in mathematical treatments of theory and
simulated models.
Models generally aren't very good at
simulating changes in rainfall patterns to increasing GHG and resulting
global warming.
The study of climate - induced changes in key ecosystem processes (Scholze et al., 2005) considers the distribution of outcomes within three sets of
model runs grouped according to the amount of
global warming they
simulate: < 2 °C, 2 - 3 °C and > 3 °C.
The study, using complex climate
modeling software to
simulate changes in forest cover and then measuring the impact on
global climate, found that northern forests tend to
warm the Earth because they absorb a lot of sunlight without losing much moisture.
It turns out,
models have
simulated over four times as much
warming compared to reality since 1998, according to a recent study in the journal Nature Climate Change, entitled: «Overestimated
global warming over the past 20 years.»