Sentences with phrase «on radiative forcing»

This may suggest that for a given optical thickness, the influence of particle shape on the radiative forcing caused by a cloud composed of small ice crystals can be negligible.

In response, the Committee on Radiative Forcing Effects on Climate was formed.

By 1994, with work on SAR progressing, the Special Report on Radiative Forcing (IPCC, 1995) reported significant breakthroughs in a set of chapters limited to assessment of the carbon cycle, atmospheric chemistry, aerosols and RF.

Here, we present an explanation for time - invariant land — sea warming ratio that applies if three conditions on radiative forcing are met: first, spatial variations in the climate forcing must be sufficiently small that the lower free troposphere warms evenly over land and ocean; second, the temperature response must not be large enough to change the global circulation to zeroth order; third, the temperature response must not be large enough to modify the boundary layer amplification mechanisms that contribute to making φ exceed unity.

The fact remains that this all has no bearing whatsoever on the radiative forcing of CO2.

ICROA is committed to reaching a consensus on Radiative Forcing Index (RFI), a consensus that accurately reflects scientific opinion on this contentious issue.

Incorporating new findings on the radiative forcing of black carbon (BC) aerosols, the magnitude of the climate sensitivity, and the strength of the climate / carbon cycle feedbacks into a simple upwelling diffusion / energy balance model similar to the one that was used in the TAR, we find that the range of projected warming for the 1990 - 2100 period is reduced to 1.1 - 2.8 °C.

These two studies are important contributions to the debate on radiative forcing, but the approach is subject to most of the limitations associated with the traditional radiative forcing calculation.

These findings are not sensitive to a wide range of assumptions, including the time series used to measure temperature, the omission of black carbon and stratospheric water vapor, and uncertainty about anthropogenic sulfur emissions and its effect on radiative forcing (SI Appendix: Sections 2.4 — 7).

The 1998 - 2008 hiatus is not the first period in the instrumental temperature record when the effects of anthropogenic changes in greenhouse gases and sulfur emissions on radiative forcing largely cancel.

This empirically - based approach is the one Hansen and Sato pursue in this paper, while noting of course that their approach can not be wholly independent of climate modeling, for example relying on radiative forcing computations from climate models, which is the most accurate way to estimate the magnitude of various forcings.

But including aerosol indirect effects on radiative forcing has made it easier to generate a greater variety of 20th century simulations without affecting other aspects of the climate simulation as strongly.

Most of the moisture is found below about 10,000 feet, so that is where the effect of changes in lapse rate will be felt, and the effect of an increase in moisture is to decrease the near - surface lapse rate, potentially resulting in an important negative feedback on radiative forcing.

Intergovernmental Panel on Climate Change (IPCC) science deliberately kept public focus on warmer temperatures and blamed it all on radiative forcing due to CO2.

Using your definition of what «empirical» means, where is the empirical data that proves that the climate sensitivity for a doubling of CO2, caused by a change on radiative forcing of abouit 3.7 Wm - 2, is any particular number you like to claim?

The structural uncertainties above are not expressed in trivial intermodel variability, but lie at the core of IPCC climate modeling, including its reliance on the radiative forcing paradigm.

What are the Current and Future Impacts of Subsonic Aviation on Radiative Forcing and UV Radiation?

What are the Current and Future Impacts of Supersonic Aviation on Radiative Forcing and UV Radiation?

I'm just not interested in hearing about another variation on the radiative forcing conjecture that I know is false physics.

The effect on radiative forcing of assuming different values for indirect aerosol forcing.

Data - based evidence on radiative forcing and constraints on climate sensitivity, Quaternary Science Reviews 2010.

If you look at IPCC there is an entire chapter on Radiative forcing, but only that convection equals a fixed number.

Long term climate based on radiative forcing is predicable on long time scales depending on the confluence parameters.

To be sure, some of these effects (such as the impact of irrigation on surface water vapour, or land use changes on evapotranspiration) are not easily dealt with in terms of the tropospheric radiative forcing — a point that was well made in the National Academies report on radiative forcing (on which Dr. Pielke was an author).

Also your inability to see that natural variability occurs on climate path based on the radiative forcing illustrates your basic misunderstanding of these realities.

with regards to Dan's question, is there any estimate of the short - term effect of ENSO on radiative forcing?

Oops sorry — the one you should start with is Reto Knutti, Thomas Stocker, Fortunat Joos & Gian - Kasper Plattner, Constraints on radiative forcing and future climate change from observations and climate model ensmbles, Nature 416, 18 April 2002.

Here we apply a «state of the art» atmospheric chemistry transport model to show that large emissions of CH4 would likely have an unexpectedly large impact on the chemical compositioof the atmosphere and on radiative forcing (RF).

Knutti, R., T.F. Stocker, F. Joos, and G.K. Plattner, 2002: Constraints on radiative forcing and future climate change from observations and climate model ensembles.

on your radiative forcings, I thought methane was 24 times more powerful greenhouse gas than CO2

To address these issues, the U.S. Climate Change Science Program (CCSP) asked the National Academies to undertake a study to evaluate the current state of knowledge on radiative forcings and to identify relevant

Not exact matches

Climate scientists use a concept called radiative forcing to quantify the effect of these increased concentrations on climate.

The role of microbes in snowmelt and radiative forcing on an Alaskan icefield.

The new findings of successful multi-year drought / fire predictions are based on a series of computer modeling experiments, using the state - of - the - art earth system model, the most detailed data on current ocean temperature and salinity conditions, and the climate responses to natural and human - linked radiative forcing.

Pierre, could you comment on what, exactly, is new in the recent Philipona paper, compared with the two similar papers they published last year («Greenhouse forcing outweighs decreasing solar radiation driving rapid temperature rise over land», «Radiative forcing — measured at Earth's surface — corroborate the increasing greenhouse effect»)?

For this new idea to have merit, it had better have heat fluxes at least on par with the radiative forcing from CO2.

Respective roles of direct GHG radiative forcing and induced Arctic sea ice loss on the Northern Hemisphere atmospheric circulation.

, there is a lot of interesting stuff going on in Antarctica: the complexities of different forcings (ozone in particular), the importance of dynamical as well as radiative processes, and the difficulties of dealing with very inhomogeneous and insufficiently long data series.

First, it probably needs to be made clearer that generally speaking radiative forcing and climate sensitivity are useful constructs that apply to a subsystem of the climate and are valid only for restricted timescales — the atmosphere and upper ocean on multi-decadal periods.

[Response: A similar conclusion to the one cited by Gavin above was reached independently by a panel of scientists (of which I was a member) convened to report on these issues by the National Academy of Sciences last year, resulting in the NAS report «Radiative Forcing of Climate Change: Expanding the Concept and Addressing Uncertainties (2005)».

Changes in TSI can be converted into a radiative forcing, which tells us the energy imbalance it causes on Earth.

James A. Edmonds • Member, IPCC Steering Committee on «New Integrated Scenarios» (2006 - present) • Lead Author, Working Group III, «Framing Issues,» IPCC Fourth Assessment Report (2007) • Lead Author, Working Group III, «Global, Regional, and National Costs and Ancillary Benefits of Mitigation,» IPCC Third Assessment Report (2001) • Lead Author, Working Group III, «Decision - Making Frameworks,» IPCC Third Assessment Report (2001) • Lead Author, Working Group III, Summary for Policy Makers, IPCC Third Assessment Report (2001) • Lead Author, Working Group II, «Energy Supply Mitigation Options,» IPCC Second Assessment Report (1996) • Lead Author, Working Group II, «Mitigation: Cross-Sectoral and Other Issues,» IPCC Second Assessment Report (1996) • Lead Author, Working Group III, «Estimating the Costs of Mitigating Greenhouse Gases,» IPCC Second Assessment Report (1996) • Lead Author, Working Group III, «A Review of Mitigation Cost Studies,» IPCC Second Assessment Report (1996) • Lead Author, Working Group III, «Integrated Assessment of Climate Change: An Overview and Comparison of Approaches and Results,» IPCC Second Assessment Report (1996) • Lead Author, IPCC Special Report, Climate Change 1994: Radiative Forcing of Climate Change and An Evaluation of the IPCC IS92 Emission Scenarios (1994) • Lead Author, IPCC Special Report, Climate Change 1992: The Supplementary Report to the IPCC Scientific Assessment (1992) • Major contributor, IPCC First Assessment Report, Working Group III, Response Strategies Working Group (1991).

In addition, researchers calculated the changes in the shortwave and longwave and net radiation between the pre-industrial simulation and the present - day simulations to estimate the radiative forcing resulting from the aerosol effects on cirrus clouds.

Radiative forcing is not a zero - sum game in the sense you laid it out, but it is fairly standard practice to use the observed temperature record to put some constraints on both climate sensitivity and the magnitude of unknown forcing.

The top priorities should be reducing uncertainties in climate sensitivity, getting a better understanding of the effect of climate change on atmospheric circulation (critical for understanding of regional climate change, changes in extremes) and reducing uncertainties in radiative forcing — particularly those associated with aerosols.

Geological studies, on the other hand, can provide estimates that integrate long - and short - term climate feedbacks to radiative forcing.

The regional climate feedbacks formulation reveals fundamental biases in a widely - used method for diagnosing climate sensitivity, feedbacks and radiative forcing — the regression of the global top - of - atmosphere radiation flux on global surface temperature.

Let's set the stage by noting that, as a significant competitor to anthropogenic greenhouse forcing of recent climate change, the direct radiative forcing by solar irradiance variations is dead on arrival.

Jo's scientific interests include radiative transfer in the atmosphere, climate modelling, radiative forcing of climate change and the influence of solar irradiance variability on climate.

Ice sheet albedo forcing is estimated to have caused a global mean forcing of about — 3.2 W m — 2 (based on a range of several LGM simulations) and radiative forcing from increased atmospheric aerosols (primarily dust and vegetation) is estimated to have been about — 1 W m — 2 each.