Sentences with phrase «feedback processes»

If the existence of such prospective bidirectional associations can be demonstrated, this represents evidence of potentially important mechanisms for the aggravation of existing problems, in the form of dynamic systems with feedback processes that lead to the emergence and stabilization of pathological patterns.

Basically, if such a bidirectional relationship can be established between two kinds of variables this means that they may enter into a self - generating «vicious cycle» where increases in the one variable lead to increases in the other, and vice versa — a process that can be described in terms of a dynamic system, where internal feedback processes lead to the emergence and stabilization of pathological patterns.

Receiving a Confirmit ACE Award is a distinct honor that demonstrates both rigorous application of customer feedback processes and outstanding performance as measured by those processes.

In the last year, McKay has been working with the senior team at the firm enhancing its client feedback processes through what she calls «a robust» annual client interview process as well as applying ongoing lessons learned.

In accordance with the Integrated Accessibility Standards Regulation with respect to Information and Communications, Torys is committed to making firm information and feedback processes accessible to people with disabilities.

Levermann et al. (9) focus their TE discussion of the relevant monsoon dynamics on nonlinear moisture advection feedback processes.

The direct CO2 radiative forcing is the change in infrared radiative fluxes for a doubling CO2 (typically from 287 to 574 ppm), without any feedback processes (e.g. from changing atmospheric water vapor amount or cloud characteristics.)

This is something I know a fair amount about, since my specialization at school in mechanical engineering was in control theory and feedback processes.

The discovery in ice core records that atmospheric concentrations of two potent greenhouse gases, carbon dioxide and methane, have decreased during past glacial periods and peaked during interglacials indicates important feedback processes in the Earth system.

The direct CO2 radiative forcing is the change in infrared radiative fluxes for a doubling CO2 (typically from 287 to 574 ppm), without any feedback processes

We should be happy there are not more positive feedback processes on our planet.

As I will discuss in the section on feedback processes later, most well - regulated natural systems have feedback mechanisms that tend to keep trends in key variables from «running away.»

Note that the majority of the warming in these models appears to be from these feedback processes.

To this point Dr. Curry stated that there is ignorance about what is known and what is not known about natural climate variability and the feedback processes, IOW whether human - induced global climate change is a real potential problem for humanity and our environment or not.

Though it is hard to pick it out exactly, section 8.6 of the fourth IPCC report seems to imply these positive feedback processes increase temperature 2 degrees for every one degree from CO2.

I will then discuss the econometric forecasts they are founded on, the assumptions about CO2 sensitivity and feedback processes, and finally model tuning and their ability to match history.

Furthermore, by homogenizing the entire ocean into a single metric, they miss important nuances of local and regional scale redox changes that might reflect the activity of climatic feedback processes, such as weathering, ocean circulation change, or temperature change.

How well do we understand and evaluate climate change feedback processes?

Let's reserve the symbol $ \ lambda $ to mean the overall or net climate feedback, and use subscripts to denote specific feedback processes.

It will be valuable for future studies to understand the magnitude, rate, and relative temporal phasing of redox changes as they are expressed in spatially diverse locations, in order to provide constraints on the heterogeneity of climatically important feedback processes operating during the PETM, and other hyperthermals.

Aires, F., and W.B. Rossow, 2003: Inferring instantaneous, multivariate and nonlinear sensitivities for the analysis of feedback processes in a dynamical system: The Lorenz model case study.

Furthermore, this framework embeds more sophisticated explanations than traditional purely radiative models and incorporates effects from feedback processes through dT / dz, response in Z T254K, and the albedo A.

Spencer and Braswell (2010) used middle tropospheric temperature anomalies and although they did not consider any time lag they may have observed some feedback processes with negligible time lag considering that the tropospheric temperature is better correlated to the radiative flux than the surface air 15 temperature.

Does this mean that, under positive feedback processes that release very large quantities of CO2 into the atmosphere, there is a limit to the increase in the average temperature of Earth?

In light of trends showing a likely 3 °C or more global temperature rise by the end of this century (a figure that could become much higher if all feedback processes, such as changes of sea ice and water vapor, are taken into account) that could result in sea level rises ranging from 20 to 59 cm (again a conservative estimation), Hansen believes it is critical for scientists in the field to speak out about the consequences and rebuke the spin offered by pundits who «have denigrated suggestions that business - as - usual greenhouse gas emissions may cause a sea level rise of the order of meters.»

New structural forms are needed for climate models that are capable of simulating the natural internal variability of the coupled ocean - atmosphere system on timescales from days to millennia and that can accurately account for the fast thermodynamic feedback processes associated with clouds and water vapor.»

Although it is reported that there are some relationships between the present states of cloud (e.g. Williams and Webb 2008, Yokohata et al. 2010) or water vapour (Sherwood et al. 2010) and climate feedback processes, it is not straightforward to relate the reliability of the present behavior and the climate sensitivity as discussed in Sect. 2.3.

It should be obvious by now, and is obvious to many in the business that the models have missed some important feedback processes.

Principal positive feedback processes in the model are changes in atmospheric water vapor, clouds and snowlice cover.

We also obtain an empirical estimate of f = 2 - 4 for the fast feedback processes (water vapor, clouds, sea ice) operating on 10 - 100 year time scales by comparing the cooling due to slow or specified changes (land ice, CO2, vegetation) to the total cooling at 18K.

We study climate sensitivity and feedback processes in three independent ways: (1) by using a three dimensional (3 - D) global climate model for experiments in which solar irradiance So is increased 2 percent or CO2 is doubled, (2) by using the CLIMAP climate boundary conditions to analyze the contributions of different physical processes to the cooling of the last ice age (18K years ago), and (3) by using estimated changes in global temperature and the abundance of atmospheric greenhouse gases to deduce an empirical climate sensitivity for the period 1850 - 1980.

In the context of models that include cloud processes, ranging from small - scale models of clouds and atmospheric chemistry to global weather and climate models, the unified theoretical foundations presented here provide the basis for incorporating cloud microphysical processes in these models in a manner that represent the process interactions and feedback processes over the relevant range of environmental and parametric conditions.

To better assess confidence in the different model estimates of climate sensitivity, two kinds of observational tests are available: tests related to the global climate response associated with specified external forcings (discussed in Chapters 6, 9 and 10; Box 10.2) and tests focused on the simulation of key feedback processes.

The unsolved puzzle of how subtle variations driven by Earth - orbit changes can affect the climate suggests a closer look at feedback processes, including other pathways than direct solar radiative forcing.

Among the global - scale tipping points identified by earth scientists are the collapse of large ice sheets in Greenland and Antarctica, changes in ocean circulation, feedback processes by which warming triggers more warming, and the acidification of the ocean.h

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 environments.

Climate model - A numerical representation of the climate system based on the physical, chemical and biological properties of its components, their interactions and feedback processes, and accounting for all or some of its known properties.

These feedback processes are related to things such as clouds, water vapor, ice, changes in ocean chemistry, and changes in vegetation.

Most feedback processes that have been identified and measured are positive or amplifying of increases in temperature.)

(Of note, only a few negative feedback processes have been identified.

Several ocean - air - sea ice feedback processes may be operating (Meredith and King 2005; Hanna 1996), though it has been difficult to pin down their relative roles in the observational studies (King 1994; Jacobs and Comiso 1997).

The primary triggers for ice ages and inter-glacials are well understood to be changes in the astronomical parameters related to the motion of our planet within the solar system and natural feedback processes in the climate system.

Paleoclimate data also provide quantitative information about how nominally slow feedback processes amplify climate sensitivity [51]--[52], [54]--[56], which also is important to our analyses.

The long lifetime of the fossil fuel carbon in the climate system and the persistence of ocean warming for millennia [201] provide sufficient time for the climate system to achieve full response to the fast feedback processes included in the 3 °C climate sensitivity.

Still, the scientists note that a number of uncertainties underpin the path of future warming, including feedback processes like the carbon cycle and clouds.

We don't understand these internal feedback processes very well, largely because we don't understand the details of how different meteorological phenomena conspire to change the amount, phase, and spatial distribution of water in the atmosphere.

Noncondensing greenhouse gases, which account for 25 % of the total terrestrial greenhouse effect, thus serve to provide the stable temperature structure that sustains the current levels of atmospheric water vapor and clouds via feedback processes that account for the remaining 75 % of the greenhouse effect.

But this relationship is complicated by several feedback processes — most importantly the hydrological cycle — that are not well understood5, 6,7.

Noncondensing greenhouse gases, which account for 25 % of the total terrestrial greenhouse effect, thus serve to provide the stable temperaturestructure that sustains the current levels of atmospheric water vapor and clouds via feedback processes that account for the remaining 75 % of the greenhouse effect.

Non-condensing greenhouse gases, which account for 25 % of the total terrestrial greenhouse effect, thus serve to provide the stable temperature structure that sustains the current levels of atmospheric water vapor and clouds via feedback processes that account for the remaining 75 % of the greenhouse effect.