Sentences with phrase «circulation models do»

For example, the existing global circulation models do not adequately describe the water cycle in the Amazon, with the modeled moisture convergence being half the actual amounts estimated from the observed runoff values.

Relevant text from the AR4 Chapter 8: «Atmosphere - Ocean General Circulation Models do not seem to have difficulty in simulating IPO - like variability... [T] here has been little work evaluating the amplitude of Pacific decadal variability in AOGCMs.

So lets see, the global circulation models do not handle thunderstorms, or clouds in general, well, The particulates and aerosols interact with the clouds, but are not handled well either.

Oddly Trenberth 2015 argued we should separate analyses of those most useful dynamics and focus on thermodynamics (temperature) because CO2 forced circulation models do a very poor job of simulating those critical dynamic changes.

On the matter of the role of condensation nuclei, a few general circulation models do have some crude representation of nucleation microphysics in their convection or cloud schemes, but it certainly isn't the key factor in the weak increase of precipitation with temperature, which is seen in all GCM's including those with very basic representations of convection.

General circulation models do simulate clouds, and the clouds they simulate are a big part of the nature of their response to both doubled CO2 and to LGM forcing.

Not exact matches

The models did not show as strong a shift as the observations, Frierson said, suggesting that ocean circulation also played a role in the drought.

I'd love to know what they did take into account in attempting to model that period — must include astronomical location, sun's behavior, best estimates about a lot of different conditions — where the continents were, what the ocean circulation was doing, whether there had been a recent geological period that laid down a lot of methane hydrates available to be tipped by Pliocene warming into bubbling out rapidly.

The climate models aren't really good enough in their representation of present - day circulation to give you much confidence in the specifics of their predictions [so that you could use them to do a cost - benefit analysis for example], but the risk of widespread change is still there.

General circulation models have generally excluded the feedback between climate and the biosphere, using static vegetation distributions and CO2 concentrations from simple carbon - cycle models that do not include climate change6.

Because of the expense of doing the Venus radiative transfer calculation, there hasn't been much modelling of the Venus general circulation.

And a proper discussion of climate change often does call for precise terms like external forcing and general circulation models, and other non-toddler friendly jargon.

For the hydrological modelling of the Thames river catchment done at CEH we showed that the changes in atmospheric circulation and precipitation caused higher peak 30 - day river flow, while flood risk mapping revealed a small increase in flood risk for properties in the Thames catchment.

Simulations with general circulation ocean models do not fully support the gas exchange - sea ice hypothesis.

He said that while it's possible human - driven global warming could have played a role in the region, the study's modeling efforts didn't convincingly replicate certain patterns and that he felt more confident that natural circulation patterns played a more likely role in pushing temperatures up across the region since 1900.

The app operates on a pay - per - circulation model, like Freading, so libraries don't have to deal with purchasing multiple copies to enable simultaneous use.

The report is quite specific that this new model is nothing to do with the iPad 5, it's not a new generation, it's an expansion of the current - generation iPad 4 family and will sit alongside the 16 GB, 32 GB and 64 GB models already in circulation.

General circulation models have generally excluded the feedback between climate and the biosphere, using static vegetation distributions and CO2 concentrations from simple carbon - cycle models that do not include climate change6.

The conference, whose theme was observations, modelling and paleo - climate related to the Thermohaline and Meridional overturning circulation (MOC) in the North Atlantic, could have been expected to attract media attention (particularly in the Europe) and indeed it did.

I can see why you would want to take into account thermal - induced circulation, but couldn't this be easily done by modeling a one - meter strip (at the tropics) extending to the poles?

Virtually the entire post is well - rooted in theory and does not require full blown General Circulation Models to appreciate, and my guess is that the general reader will take more kindly to such simple models which can be understood complModels to appreciate, and my guess is that the general reader will take more kindly to such simple models which can be understood complmodels which can be understood completely.

So even though El Nià ± o may serve as an analogue for some aspects of the influence of the weakening Walker circulation on climate, it does not serve as a dynamical analogue nor is the sensitivity to model details the same.

For example, do climate models predict jumps between states of climatic circulation, either atmospheric or oceanic?

It is uncertain, but models do suggest that the overturning circulation of the Atlantic may be affected by future warming, and this would have the unfortunate and unwanted effect of switching West Africa into a drought mode.

This is computer model crap based on General Circulation Models that fails to predict anything and the climate sensitivity is feeded in the model even though they do nt have a clue what it is.

Other modelling efforts do not indicate a future shutdown of the ocean's thermohaline circulation, and some even strengthen it.

People convinced as to the accuracy of AO - GCM (Atmosphere Ocean General Circulation Model) simulations may believe that these provide acceptable estimates of S, but even the IPCC does not deny the importance of observational evidence.

Although previous studies have offered a general global overview of water circulation between the oceans and land, this traditional two - region model does not take into account the considerable precipitation that occurs over tropical coastal regions, including the Indonesian maritime continent, the Indian subcontinent, and the Bay of Bengal.

The general circulation models are the tools to do that, but they are an imperfect crystal ball, Hurrell admits.

You'll need to be okay with not understanding why CO2 lags temperature, why its predicted effects do not match observed climate measurements, or why the IPCC's general circulation models can not predict short - term, regional, or even past climate changes accurately.

I suspect the GCM's appear to do well on a large scale because they model the broad brush circulation of the atmosphere, eg Hadley cell, coriolis etc quite well.

If I were for a moment to play the Advocatus Diaboli in the discussion, however, I would note in the defense of the climate scientists who might be in good will misled by Global Circulation Models whether or not you consider them «falsifiable» — and your asserting that they are not does not make that so — they are, generally, based on actual physics.

I agree that the application of higher resolution model equipment does not help to reduce the uncertainty range of the sea level in the Amsterdam harbours: assumptions about changes in the heat storage, icecap melting and changes in the gravity field dominate this uncertainty range (although some regiona features related to oceanic circulation and heat redistribution may be better resolved in higher resolution models).

Because radiative forcing, while it does vary somewhat with vertical profile, is relatively immune to changes of the atmosphere due to circulation, so models can do a reasonable job of predicting that the global mean temperatures increase.

I don't doubt climate models are a useful tool in understanding global circulation patterns.

Unfortunately, conductive heat flow versus age data do not confirm the cooling models because much of the heat is advected by hydrothermal circulation near the ridge axes (Hofmeister and Criss, 2005; Pollack et al., 1993).

The fact that Wahl and Ammann (2006) admit that the results of the MBH methodology does not coincide with the results of other methods such as borehole methods and atmospheric - ocean general circulation models and that Wahl and Ammann adjust the MBH methodology to include the PC4 bristlecone / foxtail pine effects are significant reasons we believe that the Wahl and Amman paper does not convincingly demonstrate the validity of the MBH methodology.

Importantly, the changes in cereal yield projected for the 2020s and 2080s are driven by GHG - induced climate change and likely do not fully capture interannual precipitation variability which can result in large yield reductions during dry periods, as the IPCC (Christensen et al., 2007) states: ``... there is less confidence in the ability of the AOGCMs (atmosphere - ocean general circulation models) to generate interannual variability in the SSTs (sea surface temperatures) of the type known to affect African rainfall, as evidenced by the fact that very few AOGCMs produce droughts comparable in magnitude to the Sahel droughts of the 1970s and 1980s.»

Do GCM's «create» cold fronts and the arctic air flows when they run, or are they «static» heat exchange models only (radiation received and radiation released are obviously their «drivers»... But what happens after the air masses have been «driven» for the equal of one or two «years» — do we see flows in the tropics, mid-latitudes, and polar latitudes than resembles earth's circulatioDo GCM's «create» cold fronts and the arctic air flows when they run, or are they «static» heat exchange models only (radiation received and radiation released are obviously their «drivers»... But what happens after the air masses have been «driven» for the equal of one or two «years» — do we see flows in the tropics, mid-latitudes, and polar latitudes than resembles earth's circulatiodo we see flows in the tropics, mid-latitudes, and polar latitudes than resembles earth's circulation?

Allowing the ocean circulation to interact with the atmosphere did not significantly alter the characteristics of the AMO in current - generation climate models.

They did not properly model the critical role of radiative gases in tropospheric convective circulation.

The general circulation models attempt to do the juggling but it is obviously an enormously difficult problem.

Already in an early comment in this thread I speculated that it may be impossible to do those analyses without the use of a full model of circulation.

Judy, If this paper is found to be in line with observations, does this mean that the General Circulation Model need to be revised?

1 — did the circulation - driven fall in Arctic sea ice (which AR4 models don't do a great job of) have anything to do with the recent jump in Arctic temperatures and if so, could we get the «right» global temp trend for the «wrong» reasons.

how did they rerun his model with different atmopsheric circulations?

By the way, we also did a paper on millennial - scale solar geoengineering (Cao et al, 2016) showing that, in at least one climate model, solar geoengineering behaves quite well on the 1000 - year time scale with no substantial long term growth in climate change as ocean circulation and such adjusts to the new conditions.

We have a lot of very good models that seem to do a very good job of modeling ocean circulation.

My main interest is in understanding what, if anything, we can say about climate sensitivity that does not rely on General Circulation Models.

However, the availability of non-radiative means for vertical transport of energy, including small - scale convection and large - scale atmospheric motions, must be accounted for, as is done in our atmospheric general circulation model.