A058
Diagnosing the Components of Radiative Forcing and Addressing its Sources of Inter-Model Spread

Session ID#: 79640

Session Description:
Radiative forcing is a key measure of how anthropogenic and natural activity perturbs radiative fluxes, which triggers all subsequent climate change.  Effective radiative forcing, the sum of instantaneous radiative forcing and rapid adjustments, is a robust predictor of equilibrium global temperature change, and a substantial source of inter-model spread. Recently, novel approaches have been introduced to decompose effective radiative forcing into its individual components, some of which have been largely undiagnosed in previous model inter-comparison experiments. This, along with new modeling benchmark calculations and observational constraints, may provide a path forward for identifying and reducing spread in radiative forcing estimates and thus climate sensitivity overall. In this session, we aim to highlight these efforts and welcome all studies focused on diagnosing radiative forcing in models and observations, assessing errors in radiative transfer parameterization and model base climatology relevant to radiative forcing, and studies addressing our theoretical understanding of radiative forcing.
Index Terms:

0321 Cloud/radiation interaction [ATMOSPHERIC COMPOSITION AND STRUCTURE]
3305 Climate change and variability [ATMOSPHERIC PROCESSES]
3311 Clouds and aerosols [ATMOSPHERIC PROCESSES]
3359 Radiative processes [ATMOSPHERIC PROCESSES]

Primary Convener:  Ryan J. Kramer, NASA Goddard Space Flight Center, Greenbelt, MD, United States
Conveners:  Christopher James Smith, University of Leeds, Leeds, LS2, United Kingdom, Laura Wilcox, University of Reading, National Centre for Atmospheric Science, Reading, United Kingdom and Robert Pincus, University of Colorado at Boulder, Boulder, CO, United States
Primary Liaison:  Ryan J. Kramer, NASA Goddard Space Flight Center, Greenbelt, MD, United States
 
Why Should Water Vapor Near-UV Absorption Be Included as a Component of Radiative Forcing? (490175)
Lei Zhu1, Linsen Pei2, Qilong Min3, Yuyi Du3, Zhechen Wang2, Bangsheng Yin3, Kai Yang4, Patrick Disterhoft5 and Thomas Pongetti6, (1)Wadsworth Center, New York State Department of Health, Department of Environmental Health Sciences, University at Albany, SUNY, Albany, NY, United States, (2)Wadsworth Center, New York State Department of Health, Albany, NY, United States, (3)University at Albany, State University of New York, Albany, NY, United States, (4)University of Maryland, College Park, MD, United States, (5)NOAA, Boulder, CO, United States, (6)NASA Jet Propulsion Laboratory, Pasadena, CA, United States
 
Bounding aerosol radiative forcing of climate change (Invited) (493069)
Nicolas Bellouin1, Johannes Quaas2, Edward Gryspeerdt3, Stefan Kinne4, Philip Stier5, Duncan Watson-Parris6, Olivier Boucher7, Ken S Carslaw8, Matthew Christensen6, Anne-Laure Daniau9, Jean-Louis Dufresne10, Graham Feingold11, Stephanie Fiedler12, Piers Forster13, Andrew Gettelman14, James Matthew Haywood15, Florent Malavelle16, Ulrike Lohmann17, Thorsten Mauritsen18, Daniel T McCoy13, Gunnar Myhre19, Johannes Mulmenstadt2, David Neubauer20, Anna Possner21, Maria Rugenstein22, Yousuke Sato23, Michael Schulz24, Stephen E Schwartz25, Odran Sourdeval3, Trude Storelvmo26, Velle Toll27, David M Winker28 and Bjorn B Stevens12, (1)University of Reading, Department of Meteorology, Reading, United Kingdom, (2)University of Leipzig, Leipzig Institute for Meteorology, Leipzig, Germany, (3)University of Leipzig, Leipzig, Germany, (4)Organization Not Listed, Washington, DC, United States, (5)University of Oxford, Department of Physics, Oxford, United Kingdom, (6)University of Oxford, Oxford, United Kingdom, (7)LMD, Paris Cedex 05, France, (8)University of Leeds, Leeds, LS2, United Kingdom, (9)CNRS, Environnnments et Paléoenvironnements Océaniques et Continentaux, Bordeaux, France, (10)Laboratoire de Météorologie Dynamique Palaiseau, Palaiseau Cedex, France, (11)NOAA CSD, Boulder, CO, United States, (12)Max Planck Institute for Meteorology, Hamburg, Germany, (13)University of Leeds, Leeds, United Kingdom, (14)NCAR, Boulder, CO, United States, (15)University of Exeter, Exeter, EX4, United Kingdom, (16)University of Exeter, Exeter, United Kingdom, (17)ETH Zurich, Zurich, Switzerland, (18)Stockholm University, Department of Meteorology, Stockholm, Sweden, (19)Center for International Climate and Environmental Research Oslo, Oslo, Norway, (20)ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland, (21)Carnegie Institution for Science Stanford, Department of Global Ecology, Stanford, CA, United States, (22)IMAU University Utrecht, Utrecht, Netherlands, (23)RIKEN, Advanced Institute for Computational Science, Kobe, Japan, (24)Norwegian Meteorological Institute, Climate and Air Pollution Section, Oslo, Norway, (25)Brookhaven National Laboratory, Upton, NY, United States, (26)University of Oslo, Oslo, Norway, (27)University of Reading, Reading, United Kingdom, (28)NASA Langley Research Center, Hampton, VA, United States
 
Assessment of the pre-industrial to present-day anthropogenic forcing, including apportionment of the methane and halocarbon forcings: First results from UKESM1 (Invited) (501565)
Fiona M O'connor1, N. Luke Abraham2, Alexander T Archibald3, William Collins4, M Dalvi5, Gerd Folberth6, Paul T Griffiths7, Catherine Hardacre5, Ben Thomas Johnson5, Colin Johnson8, James M Keeble3, Olaf Morgenstern9, Jane Patricia Mulcahy10, Eddy Robertson8, Steven Rumbold11, Alistair Sellar1, Sungbo Shim12, Joao Teixeira13, Steven Turnock14, Jonny Williams9, Andy Wiltshire14, Guang Zeng15 and Colin Jones14, (1)Met Office Hadley Centre for Climate Science and Services, Exeter, United Kingdom, (2)University of Cambridge, Chemistry, Cambridge, United Kingdom, (3)University of Cambridge, Cambridge, United Kingdom, (4)University of Reading, Reading, RG6, United Kingdom, (5)Met Office, Exeter, United Kingdom, (6)Met Office Hadley center for Climate Change, ESMS, Exeter, United Kingdom, (7)Chemistry Dept, Cambridge, United Kingdom, (8)Met Office Hadley center for Climate Change, Exeter, United Kingdom, (9)National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand, (10)Met Office Hadley Centre for Climate Change, Exeter, United Kingdom, (11)National Centre for Atmospheric Science, University of Reading, Reading, United Kingdom, (12)National Institute of Meteorological Sciences, Climate Research Division, Seogwipo-si, South Korea, (13)UK Met Office, Exeter, United Kingdom, (14)Met Office Hadley Centre, Exeter, United Kingdom, (15)National Institute of Water and Atmospheric Research, Wellington, New Zealand
 
On the Causal Relationship between Moist Diabatic Circulation and Cloud Rapid Adjustment to Increasing CO2 (504322)
Tra Dinh, University of Auckland, Auckland, New Zealand and Stephan Fueglistaler, Princeton University, Department of Geosciences, Princeton, NJ, United States
 
On the Meridional Gradient in Clear-Sky CO2 Forcing (516979)
Nadir Jeevanjee, Princeton University, Princeton, NJ, United States, Jacob Seeley, Harvard University, Center for the Environment, Cambridge, MA, United States, David Paynter, NOAA GFDL, Princeton, NJ, United States and Stephan Fueglistaler, Princeton University, Department of Geosciences, Princeton, NJ, United States
 
Comparing Radiative Forcings from an updated GFDL radiation algorithm with line-by-line results (548329)
M Daniel Schwarzkopf1, David Paynter1 and Raymond Menzel2, (1)NOAA GFDL, Princeton, NJ, United States, (2)Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
 
The role of surface shortwave flux correction in reducing climatological temperature biases (557201)
Ehsan Erfani, George Mason University, Fairfax, VA, United States and Natalie Burls, George Mason University, Atmospheric, Oceanic and Earth Sciences, Fairfax, VA, United States
 
Implications of generalized Lorenz-­Mie theory for shortwave cloud radiative effects in an absorbing atmosphere (565147)
William Drew Collins1, Daniel Feldman2 and Chaincy Kuo1, (1)Lawrence Berkeley National Laboratory, Climate and Ecosystem Sciences Division, Berkeley, CA, United States, (2)Lawrence Berkeley National Laboratory, Berkeley, CA, United States
 
Does vertical resolution matter when using a 1-D radiative transfer model to solve for cirrus cloud forcing? (596873)
Erica K Dolinar, American Society of Engineering Education c/o Naval Research Laboratory, Monterey, CA, United States, James R Campbell, Naval Research Laboratory, Monterey, CA, United States, Yu Gu, UCLA 405 Hilgard Ave, Los Angeles, CA, United States, Jared Wayne Marquis, University of North Dakota, Department of Atmospheric Sciences, Grand Forks, ND, United States and Theodore McHardy, University of Arizona, Department of Hydrology and Atmoshperic Sciences, Tucson, AZ, United States
 
Effective Radiative Forcing and Rapid Adjustments in CMIP6 (611887)
Christopher James Smith, University of Leeds, Leeds, LS2, United Kingdom, Ryan J. Kramer, University of Miami, Miami, FL, United States, Robert Pincus, University of Colorado at Boulder, Boulder, CO, United States and Piers Forster, University of Leeds, Leeds, United Kingdom
 
How Much Do Physical Uncertainties in Radiative Transfer Impact Our Estimates Of Radiative Forcing? (620250)
Raymond Menzel, UCAR, Princeton, NJ, United States and David Paynter, NOAA GFDL, Princeton, NJ, United States
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