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Title: Constraining the instantaneous aerosol influence on cloud albedo

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
ORCiD logo [1];  [2];  [3];  [4];  [5];  [3];  [4];  [3];  [6]; ORCiD logo [7];  [8];  [5];  [9];  [5]
  1. Univ. Leipzig, Leipzig (Germany); Imperial College London, London (United Kingdom)
  2. Univ. Leipzig, Leipzig (Germany)
  3. ETH Zurich, Zurich (Switzerland)
  4. National Center for Atmospheric Research, Boulder, CO (United States)
  5. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  6. Stockholm Univ., Stockholm (Sweden); Univ. of Exeter, Exeter (United Kingdom)
  7. Univ. of Oxford, Oxford (United Kingdom)
  8. Kyushu Univ., Fukuoka (Japan)
  9. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Nanjing Univ., Nanjing (China); Collaborative Innovation Center of Climate Change, Nanjing (China)

Much of the uncertainty in estimates of the anthropogenic forcing of climate change comes from uncertainties in the instantaneous effect of aerosols on cloud albedo, known as the Twomey effect or the radiative forcing from aerosol–cloud interactions (RFaci), a component of the total or effective radiative forcing. Because aerosols serving as cloud condensation nuclei can have a strong influence on the cloud droplet number concentration (Nd), previous studies have used the sensitivity of the Nd to aerosol properties as a constraint on the strength of the RFaci. However, recent studies have suggested that relationships between aerosol and cloud properties in the present-day climate may not be suitable for determining the sensitivity of the Nd to anthropogenic aerosol perturbations. Using an ensemble of global aerosol–climate models, this study demonstrates how joint histograms between Nd and aerosol properties can account for many of the issues raised by previous studies. It shows that if the anthropogenic contribution to the aerosol is known, the RFaci can be diagnosed to within 20% of its actual value. Furthermore, the accuracy of different aerosol proxies for diagnosing the RFaci is investigated, confirming that using the aerosol optical depth significantly underestimates the strength of the aerosol–cloud interactions in satellite data.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1361962
Report Number(s):
PNNL-SA-126491; KP1703040
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, Issue 19; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 56 works
Citation information provided by
Web of Science

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Cited By (26)

Cloud physics from space
  • Stephens, Graeme L.; Christensen, Matthew; Andrews, Timothy
  • Quarterly Journal of the Royal Meteorological Society, Vol. 145, Issue 724 https://doi.org/10.1002/qj.3589
journal August 2019
Assessment of aerosol–cloud–radiation correlations in satellite observations, climate models and reanalysis journal August 2018
The Radiative Forcing of Aerosol–Cloud Interactions in Liquid Clouds: Wrestling and Embracing Uncertainty journal February 2018
Remote Sensing of Droplet Number Concentration in Warm Clouds: A Review of the Current State of Knowledge and Perspectives journal June 2018
Global Estimates of Changes in Shortwave Low-Cloud Albedo and Fluxes Due to Variations in Cloud Droplet Number Concentration Derived From CERES-MODIS Satellite Sensors journal September 2018
Background Conditions Influence the Estimated Cloud Radiative Effects of Anthropogenic Aerosol Emissions From Different Source Regions journal February 2019
Improved Aerosol Processes and Effective Radiative Forcing in HadGEM3 and UKESM1 journal November 2018
Aerosols in the E3SM Version 1: New Developments and Their Impacts on Radiative Forcing journal January 2020
Observational constraint on cloud susceptibility weakened by aerosol retrieval limitations journal July 2018
Analysis of polarimetric satellite measurements suggests stronger cooling due to aerosol-cloud interactions journal November 2019
Unveiling aerosol–cloud interactions – Part 1: Cloud contamination in satellite products enhances the aerosol indirect forcing estimate journal January 2017
Unveiling aerosol–cloud interactions – Part 2: Minimising the effects of aerosol swelling and wet scavenging in ECHAM6-HAM2 for comparison to satellite data journal January 2017
The importance of comprehensive parameter sampling and multiple observations for robust constraint of aerosol radiative forcing journal January 2018
Ice crystal number concentration estimates from lidar–radar satellite remote sensing – Part 2: Controls on the ice crystal number concentration journal January 2018
Predicting decadal trends in cloud droplet number concentration using reanalysis and satellite data journal January 2018
Aerosol midlatitude cyclone indirect effects in observations and high-resolution simulations journal January 2018
Aerosol and physical atmosphere model parameters are both important sources of uncertainty in aerosol ERF journal January 2018
Separating radiative forcing by aerosol–cloud interactions and rapid cloud adjustments in the ECHAM–HAMMOZ aerosol–climate model using the method of partial radiative perturbations journal January 2019
Constraining the aerosol influence on cloud liquid water path journal January 2019
Is positive correlation between cloud droplet effective radius and aerosol optical depth over land due to retrieval artifacts or real physical processes? journal January 2019
Surprising similarities in model and observational aerosol radiative forcing estimates journal January 2020
Unveiling aerosol-cloud interactions - Part 2: Minimising the effects of aerosol swelling and wet scavenging in ECHAM6-HAM2 for comparison to satellite data text January 2017
Unveiling aerosol-cloud interactions - Part 1: Cloud contamination in satellite products enhances the aerosol indirect forcing estimate text January 2017
Surprising similarities in model and observational aerosol radiative forcing estimates text January 2020
The value of remote marine aerosol measurements for constraining radiative forcing uncertainty journal January 2020
Deconvolution of boundary layer depth and aerosol constraints on cloud water path in subtropical stratocumulus decks journal January 2020

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