A44D:
Quantifying and Reducing the Uncertainties in the Global and Regional Aerosol Forcing of Climate II


Submit an Abstract to this Session


Session ID#: 60799

Session Description:
Uncertainties in aerosol radiative forcing constitute a principal barrier in our quantitative understanding of the global and regional climate system. Large uncertainty in the radiative forcing of anthropogenic aerosols persists despite significant developments in model complexity, increases in global observations and advances in our knowledge of aerosol-related physical, chemical, and dynamical processes. The scope of the session includes: aerosol-related causes of uncertainty, methodologies to reduce the uncertainty in forcings, process-based evaluations, constraints on model simulations using observations of aerosols, clouds and radiation, insights into microphysics-chemistry-optics-radiation linkages, and improved understanding of the forcing influences on atmospheric circulation including effects on the hydrological cycle. Novel ways of model analysis, synthesis of model and observation data to quantify and narrow the uncertainties, and advances in the significance of the global-to-regional-to-smaller scale forcing and phenomena with implications for the reduction of uncertainties, would be instructive.
Primary Convener:  Ken S Carslaw, University of Leeds, Leeds, United Kingdom
Conveners:  J F Lamarque, National Center for Atmospheric Research, Boulder, CO, United States, V Ramaswamy, NOAA/OAR/ GFDL, Princeton, United States and Massimo A Bollasina, University of Edinburgh, Edinburgh, United Kingdom
Primary Liaison:  Ken S Carslaw, University of Leeds, Leeds, United Kingdom
Chairs:  V Ramaswamy, NOAA/OAR/ GFDL, Princeton, United States and J F Lamarque, National Center for Atmospheric Research, Boulder, CO, United States
OSPA Liaison:  V Ramaswamy, NOAA/OAR/ GFDL, Princeton, United States
Co-Organized with:
Atmospheric Sciences, and Global Environmental Change

Proposed Co-Organized Session with:
  • GC - Global Environmental Change
Index Terms:

0305 Aerosols and particles [ATMOSPHERIC COMPOSITION AND STRUCTURE]
3311 Clouds and aerosols [ATMOSPHERIC PROCESSES]
3337 Global climate models [ATMOSPHERIC PROCESSES]
3359 Radiative processes [ATMOSPHERIC PROCESSES]

Abstracts Submitted to this Session:

Competing roles of the fast and slow response in the total coupled West African precipitation response to anthropogenic aerosol forcing (393086)
Haruki Hirasawa1, Thomas Oudar1, Paul J Kushner2, Michael Sigmond3, John C Fyfe4 and Clara Deser5, (1)University of Toronto, Toronto, ON, Canada, (2)University of Toronto, Physics, Toronto, ON, Canada, (3)Canadian Centre for Climate Modelling and Analysis, Victoria, BC, Canada, (4)Environment Canada, Canadian Centre for Climate Modeling and Analysis, Victoria, BC, Canada, (5)National Center for Atmospheric Research, Climate and Global Dynamics Division, Boulder, CO, United States
Understanding Global Impacts Of Regional Aerosol Emissions Using Idealized Experiments (Invited) (357311)
Brian Medeiros, National Center for Atmospheric Research, Climate and Global Dynamics Laboratory, Boulder, United States
The Dependence of Local vs. Remote Precipitation Impacts of Aerosols on Emitting Region (444025)
Geeta Persad, Carnegie Institution for Science Stanford, Stanford, CA, United States, Flor Vanessa Maciel, UC Santa Cruz, Santa Cruz, CA, United States and Ken Caldeira, Gates Ventures, Kirkland, United States
Using Volcanic Eruptions to Characterize and Reduce Uncertainties in Aerosol Radiative Forcing of Climate (400331)
Andrew Gettelman, National Center for Atmospheric Research, Boulder, CO, United States, Jennifer D. Small Griswold, University of Hawaii at Manoa, Atmospheric Sciences, Honolulu, HI, United States, James M. Haywood, Met Office, Exeter, United Kingdom and Florent Malavelle, University of Exeter, Exeter, United Kingdom
Observations and Parameterizations of Autoconversion in Marine Stratocumulus:Giant Cloud Condensation Nuclei (GCCN) and the Case for a Major Shift in Aerosol-Cloud Interaction in Climate Prediction. (468889)
Jorgen B Jensen, University Corporation for Atmospheric Research, Boulder, CO, United States; National Center for Atmospheric Research, Boulder, CO, United States and Mikael Witte, University of California Los Angeles, JIFRESSE, Los Angeles, CA, United States
Revisiting how well 20th century temperature trends constrain aerosol radiative forcing (414900)
Anna Lea Albright1,2, Peter J Huybers2 and Cristian Proistosescu3, (1)Laboratoire de Météorologie Dynamique, Paris, France, (2)Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA, United States, (3)University of Illinois at Urbana Champaign, Department of Climate, Meteorology & Atmospheric Sciences, Urbana, United States
Errors and Uncertainty in Absorbed Solar Radiation and the Hydrological Cycle (416021)
Alexandra L Jones, Princeton University, Princeton, NJ, United States, Stuart Freidenreich, Geophysical Fluid Dynamics Laboratory, Princeton, United States, David Paynter, NOAA/ Geophysical Fluid Dynamics Laboratory, Princeton, United States, Daniel Feldman, Lawrence Berkeley National Laboratory, Berkeley, CA, United States, V Ramaswamy, NOAA/OAR/ GFDL, Princeton, United States, William Drew Collins, Berkeley Lab and UC Berkeley, Berkeley, United States and Robert Pincus, Lamont-Doherty Earth Observatory, Palisades, NY, United States

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