A070
Marine Cloud Brightening: exploring inadvertent and deliberate perturbations to understand aerosol-cloud interactions.
Session ID#: 159933
Session Description:
Marine Cloud Brightening (MCB) occurs when increases in natural or anthropogenic aerosols increase the sunlight reflected by marine low clouds. MCB has also been proposed as a climate intervention approach to offset greenhouse gas radiative forcing and cool Earth. But the processes that create MCB make it hard to quantify current and potential future brightening. Natural and anthropogenic aerosol perturbations from known sources provide “opportunistic experiments” (also known as natural experiments) to quantify aerosol-cloud interactions in many marine low cloud systems. Although opportunistic experiments allow causality to be confidently inferred, significant progress on the process-scales of the aerosols and clouds needs to be made to utilize natural laboratories for quantitative evaluation of the efficacy of MCB as a potential climate intervention approach. This session welcomes studies examining aerosol perturbations covering a wide range of locations and spatiotemporal scales, including point sources such as volcanic eruptions or industrial sources, plumes from biomass burning or forest fires, tracks from individual ships or shipping corridors as well as intentional aerosol injection experiments aimed at brightening marine low clouds. Observational and multiscale modeling studies are of interest. The goal of this session is to place these opportunistic experiments on a common footing, facilitating new insights and a clearer understanding of key uncertainties related to MCB from the cloud-scale to the globe.
Index Terms:
0305 Aerosols and particles [ATMOSPHERIC COMPOSITION AND STRUCTURE]
0320 Cloud physics and chemistry [ATMOSPHERIC COMPOSITION AND STRUCTURE]
0321 Cloud/radiation interaction [ATMOSPHERIC COMPOSITION AND STRUCTURE]
3311 Clouds and aerosols [ATMOSPHERIC PROCESSES]
Primary Convener: Robert Wood, University of Washington, Department of Atmospheric Sciences, Seattle, United States
Conveners: Franziska Glassmeier, Delft University of Technology, Delft, Netherlands, Matthew Christensen, Pacific Northwest National Laboratory, Richland, WA, United States and Andrew Gettelman, National Center for Atmospheric Research, Boulder, CO, United States
On the Conditionality of Marine Low Cloud Albedo Susceptibility: from Meteorological Conditions to Spatiotemporal Scales (Invited) (1062661)
Jianhao Zhang, NOAA, Chemical Sciences Laboratory, Boulder, United States; University of Colorado, Cooperative Institute for Research in Environmental Sciences (CIRES), Boulder, CO, United States, Takanobu Yamaguchi, NOAA ESRL Chemical Sciences Laboratory / CIRES University of Colorado Boulder, Boulder, CO, United States and Graham Feingold, NOAA CSL, Boulder, CO, United States
Observational Evidence of Strong Forcing from Aerosol Effect on Low Cloud Coverage With Large-scale Ship-track Samples (1089747)
Tianle Yuan1, Hua Song2, Robert Wood3, Lazaros Oreopoulos4, Steven E Platnick1, Chenxi Wang5, Hongbin Yu6, Kerry Meyer1 and Eric M Wilcox7, (1)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (2)University of Maryland Baltimore County, Baltimore, MD, United States, (3)University of Washington, Department of Atmospheric Sciences, Seattle, United States, (4)NASA GSFC, Greenbelt, United States, (5)University of Maryland College Park, College Park, United States, (6)NASA Goddard Space Flight Center, Greenbelt, United States, (7)Desert Research Institute, Division of Atmospheric Sciences, Reno, NV, United States
The impact of aerosol injections and adjustments in large-scale subsidence on stratocumulus-to-cumulus transition. (1090994)
Je-yun Chun1,2, Robert Wood1, Peter N Blossey3 and Sarah J Doherty3, (1)University of Washington, Department of Atmospheric Sciences, Seattle, United States, (2)Korea Institute of Ocean Science & Technology, Marine Disaster Research Center, Busan, South Korea, (3)University of Washington, Seattle, United States
Mixed-Layer Budget Analyses of Conditionally Sampled Ship Tracks in LES (1124564)
Lucas McMichael1, Robert Wood2, Peter N Blossey3 and Je-yun Chun2, (1)University of Washington, Atmospheric Sciences, Seattle, United States, (2)University of Washington, Department of Atmospheric Sciences, Seattle, United States, (3)University of Washington, Seattle, United States
Generation and delivery of particles to brighten marine clouds: constraints on the size distribution (1130756)
Robert Wood1, Sarah J Doherty2, Jessica Medrado3 and Dongyun Shin3, (1)University of Washington, Department of Atmospheric Sciences, Seattle, United States, (2)University of Washington, Seattle, United States, (3)PARC, Palo Alto, United States
Aerosolization of seawater using two-phase-flow spray systems to brighten marine stratocumulus clouds (1133503)
Jessica Medrado1, Dongyun Shin1, Sean Garner2, Robert Wood3, Sarah J Doherty4, Armand Neukermans5, Gary F Cooper5, Lee K Galbraith5, Sudhanshu Jain5, David Johnson1 and Kate Murphy5, (1)PARC, Palo Alto, United States, (2)Palo Alto Research Center, Palo Alto, CA, United States, (3)University of Washington, Department of Atmospheric Sciences, Seattle, United States, (4)University of Washington, Seattle, United States, (5)Unaffiliated, Palo Alto, United States
Using a phase space of environmental variables to drive an ensemble of cloud-resolving simulations of low marine clouds (1137827)
Ehsan Erfani1, Robert Wood2, Peter N Blossey3, Sarah J Doherty3 and Ryan M Eastman4, (1)University of Washington, Seattle, WA, United States, (2)University of Washington, Department of Atmospheric Sciences, Seattle, United States, (3)University of Washington, Seattle, United States, (4)University of Washington, Atmospheric Sciences Department, Seattle, WA, United States
Marine Cloud Brightening Forcing and Climate Response in the Community Earth System Model 2 (1157197)
Haruki Hirasawa1, Dipti Hingmire1, Hansi Alice Singh1, Phil Rasch2, Linda Hedges3, Brian Dobbins4, Peetak Mitra5, Subhashis Hazarika5, Soo Kyung Kim5 and Kalai Ramea6, (1)University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada, (2)University of Washington, Seattle, United States, (3)SilverLining, Washington DC, United States, (4)National Center for Atmospheric Research, Boulder, CO, United States, (5)PARC, Palo Alto, United States, (6)PARC, Palo Alto, CA, United States
Efficiency of marine cloud brightening simulated by Community Earth System Model version 2 (1159413)
Chih-Chieh Chen, National Center for Atmospheric Research, Boulder, United States, Jadwiga Richter, National Center for Atmospheric Research, Climate and Global Dynamics Laboratory, Boulder, CO, United States, Douglas MacMartin, Cornell University, Sibley School of Mechanical and Aerospace Engineering, Ithaca, NY, United States and Ben Kravitz, Indiana University, Bloomington, IN, United States
Impact of Aerosol Perturbation on Marine Stratocumulus Clouds (1162830)
Prasanth Prabhakaran, Cooperative Institute for Research in Environmental Sciences, Boulder, United States; NOAA, Chemical Sciences Laboratory, Boulder, United States, Fabian Hoffmann, Ludwig Maximilians University of Munich, Munich, Germany and Graham Feingold, NOAA CSL, Boulder, CO, United States
Assessing Effective Radiative Forcing from Aerosol-Cloud Interactions over the Global Ocean (1174677)
Casey Wall, University of Oslo, Oslo, Norway, Joel R Norris, Scripps Institution of Oceanography, La Jolla, CA, United States, Anna Possner, Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Frankfurt, Germany, Daniel McCoy, University of Wyoming, Laramie, WY, United States, Isabel Louise McCoy, University of Miami, Rosenstiel School, Miami, FL, United States and Nicholas Lutsko, Scripps Institution of Oceanography, CASPO, San Diego, United States
