Difference between revisions of "Direct forcing"

From Earth Science Information Partners (ESIP)
Line 13: Line 13:
 
To complement individual estimates of the direct aerosol radiative effects by multi-model / satellite-retrieval intercomparison studies.
 
To complement individual estimates of the direct aerosol radiative effects by multi-model / satellite-retrieval intercomparison studies.
  
===Processes and possible Diagnostics===
+
===Status and Progress===
 +
 
 +
A number of new assessments of the direct aerosol radiative effects have been published since the 2006 AeroCom meeting, most notably the fourth IPCC assessment report (FAR). In Chapter 2 of FAR, Foster et al. estimate the annual-mean anthropogenic direct aerosol radiative forcing at the top-of atmosphere as
 +
-0.50±0.40 Wm-2, partly based on results of the AeroCom Forcing experiment (Schulz et al., 2006). As evident from the large error bar, the uncertainty in current aerosol radiative forcing estimates remains large and demands for future research.
 +
 
 +
Individual studies on the global direct aerosol radiative effects since AeroCom 2006 include work by Charlson et al. (2007) “On the climate forcing consequences of the albedo continuum between cloudy and clear air”, Chen et al. (2007) on “Future climate impacts of direct radiative forcing of anthropogenic aerosols, tropospheric ozone, and long-lived greenhouse gases”, Stier et al. (2007) on “Aerosol absorption and radiative forcing”, Mishchenko et al. (2007) on “Accurate monitoring of terrestrial aerosols and total solar irradiance - Introducing the glory mission”, Liu et al. (2007) on “Uncertainties in global aerosol simulations: Assessment using three meteorological data sets”, Jones and Christopher (2007) on “Statistical variability of top of atmosphere cloud-free shortwave aerosol radiative effect”, Bauer et al. (2007) on “Do sulfate and nitrate coatings on mineral dust have important effects on radiative properties and climate modeling?”, Koch et al. (2007) on “Linking future aerosol radiative forcing to shifts in source activities”, Naik et al. (2007) “On the sensitivity of radiative forcing from biomass burning aerosols and ozone to emission location”, Koch et al. (2007) on “Global impacts of aerosols from particular source regions and sectors”,  Feng and Penner (2007) on “Global modeling of nitrate and ammonium: Interaction of aerosols and tropospheric chemistry”, Balkanski et al. (2007) on “Reevaluation of Mineral aerosol radiative forcings suggests a better agreement with satellite and AERONET data”, Schulz et al. (2006) on “Radiative forcing by aerosols as derived from the AeroCom present-day and pre-industrial simulations”, Bond et al. (2007) on “Limitations in the enhancement of visible light absorption due to mixing state”, Myhre et al. (2007) on “Modelling of nitrate and ammonium-containing aerosols in presence of sea salt”, Takemura et al. (2006) “Time evolutions of various radiative forcings for the past 150 years estimated by a general circulation model”, Stier et al. (2007) on the “Impact of nonabsorbing anthropogenic aerosols on clear-sky atmospheric absorption”, Ghan and Easter (2006)  on the “Impact of cloud-borne aerosol representation on aerosol direct and indirect effects”.
  
 
===Short-term actions/experiments===
 
===Short-term actions/experiments===

Revision as of 13:48, October 20, 2007

Go back to AeroCom/Working group structure

See also summary of AeroCom/Recommendations

AeroCom working group Direct forcing[edit | edit source]

Participants for analysis[edit | edit source]

Participants for experiments[edit | edit source]

Goals[edit | edit source]

To complement individual estimates of the direct aerosol radiative effects by multi-model / satellite-retrieval intercomparison studies.

Status and Progress[edit | edit source]

A number of new assessments of the direct aerosol radiative effects have been published since the 2006 AeroCom meeting, most notably the fourth IPCC assessment report (FAR). In Chapter 2 of FAR, Foster et al. estimate the annual-mean anthropogenic direct aerosol radiative forcing at the top-of atmosphere as -0.50±0.40 Wm-2, partly based on results of the AeroCom Forcing experiment (Schulz et al., 2006). As evident from the large error bar, the uncertainty in current aerosol radiative forcing estimates remains large and demands for future research.

Individual studies on the global direct aerosol radiative effects since AeroCom 2006 include work by Charlson et al. (2007) “On the climate forcing consequences of the albedo continuum between cloudy and clear air”, Chen et al. (2007) on “Future climate impacts of direct radiative forcing of anthropogenic aerosols, tropospheric ozone, and long-lived greenhouse gases”, Stier et al. (2007) on “Aerosol absorption and radiative forcing”, Mishchenko et al. (2007) on “Accurate monitoring of terrestrial aerosols and total solar irradiance - Introducing the glory mission”, Liu et al. (2007) on “Uncertainties in global aerosol simulations: Assessment using three meteorological data sets”, Jones and Christopher (2007) on “Statistical variability of top of atmosphere cloud-free shortwave aerosol radiative effect”, Bauer et al. (2007) on “Do sulfate and nitrate coatings on mineral dust have important effects on radiative properties and climate modeling?”, Koch et al. (2007) on “Linking future aerosol radiative forcing to shifts in source activities”, Naik et al. (2007) “On the sensitivity of radiative forcing from biomass burning aerosols and ozone to emission location”, Koch et al. (2007) on “Global impacts of aerosols from particular source regions and sectors”, Feng and Penner (2007) on “Global modeling of nitrate and ammonium: Interaction of aerosols and tropospheric chemistry”, Balkanski et al. (2007) on “Reevaluation of Mineral aerosol radiative forcings suggests a better agreement with satellite and AERONET data”, Schulz et al. (2006) on “Radiative forcing by aerosols as derived from the AeroCom present-day and pre-industrial simulations”, Bond et al. (2007) on “Limitations in the enhancement of visible light absorption due to mixing state”, Myhre et al. (2007) on “Modelling of nitrate and ammonium-containing aerosols in presence of sea salt”, Takemura et al. (2006) “Time evolutions of various radiative forcings for the past 150 years estimated by a general circulation model”, Stier et al. (2007) on the “Impact of nonabsorbing anthropogenic aerosols on clear-sky atmospheric absorption”, Ghan and Easter (2006) on the “Impact of cloud-borne aerosol representation on aerosol direct and indirect effects”.

Short-term actions/experiments[edit | edit source]

  • Proposed AeroCom Prescribed Experiment
    The simulated AeroCom forcings show significant diversity that can partly be attributed to processes in the host models. To isolate the host model contribution we propose a simple AeroCom experiment with prescribed aerosol fields derived from the median of the AeroCom models. Please contribute to the discussion on the AeroCom Prescribed page. (PhilipStier)

Data to look at[edit | edit source]