Aerosol-driven droplet concentrations dominate coverage and water of oceanic low-level clouds

  title={Aerosol-driven droplet concentrations dominate coverage and water of oceanic low-level clouds},
  author={Daniel Rosenfeld and Yannian Zhu and Minghuai Wang and Youtong Zheng and Tom Goren and Shaocai Yu},
Reflections on cloud effects How much impact does the abundance of cloud condensation nuclei (CCN) aerosols above the oceans have on global temperatures? Rosenfeld et al. analyzed how CCN affect the properties of marine stratocumulus clouds, which reflect much of the solar radiation received by Earth back to space (see the Perspective by Sato and Suzuki). The CCN abundance explained most of the variability in the radiative cooling. Thus, the magnitude of radiative forcing provided by these… Expand
Aerosols enhance cloud lifetime and brightness along the stratus-to-cumulus transition
It is shown that aerosols can enhance cloud fraction and extend the lifetime of overcast cloud fields primarily under stable atmospheric conditions as typically found off the west coasts of subtropical stratocumulus-dominated regions. Expand
Aerosol-cloud-climate cooling overestimated by ship-track data
It is shown that ship-track studies cannot be generalized to estimate the climatological forcing of anthropogenic aerosol, and the ship track–derived sensitivity of the radiative effect of nonprecipitating stratocumulus to aerosol overestimates their cooling effect. Expand
Weak average liquid-cloud-water response to anthropogenic aerosols
The cooling of the Earth’s climate through the effects of anthropogenic aerosols on clouds offsets an unknown fraction of greenhouse gas warming. An increase in the amount of water insideExpand
Ship-track-based assessments overestimate the cooling effect of anthropogenic aerosol
The effect of anthropogenic aerosol on the reflectivity of stratocumulus cloud decks through changes in cloud amount is a major uncertainty in climate projections. The focus of this study is theExpand
Large‐Scale Industrial Cloud Perturbations Confirm Bidirectional Cloud Water Responses to Anthropogenic Aerosols
Aerosols offset a poorly quantified fraction of anthropogenic greenhouse gas warming, and the aerosol impact on clouds is the most uncertain mechanism of anthropogenic climate forcing. Here,Expand
How do aerosols affect cloudiness?
The Rosenfeld et al. (2) report that the cloud response to the interaction is much larger than previously estimated (see the figure). Expand
Environmental Effects on Aerosol-Cloud Interaction in non-precipitating MBL Clouds over the Eastern North Atlantic
  • Xiaojian Zheng, B. Xi, Xiquan Dong, Peng Wu
  • Environmental Science
  • 2021
Abstract. Over the eastern north Atlantic (ENA) ocean, a total of 20 non-precipitating single-layer marine boundary layer (MBL) stratus and stratocumulus cloud cases are selected in order toExpand
Snow-induced buffering in aerosol–cloud interactions
Complex aerosol–cloud–precipitation interactions lead to large differences in estimates of aerosol impacts on climate among general circulation models (GCMs) and satellite retrievals. Typically,Expand
Measurement report: Cloud processes and the transport of biological emissions affect southern ocean particle and cloud condensation nuclei concentrations
Abstract. Long-range transport of biogenic emissions from the coast of Antarctica, precipitation scavenging, and cloud processing are the main processes that influence the observed variability inExpand
Measurement report: Cloud Processes and the Transport of Biological Emissions Regulate Southern Ocean Particle and Cloud Condensation Nuclei Concentrations
Abstract. Long-range transport of biogenic emissions from the coast of Antarctica, precipitation scavenging, and cloud processing are the main processes that influence the observed variability inExpand


From aerosol-limited to invigoration of warm convective clouds
It is proposed that convective-cloud invigoration by aerosols can be viewed as an extension of the concept of aerosol-limited clouds, where cloud development is limited by the availability of cloud-condensation nuclei. Expand
Hemispheric Aerosol Vertical Profiles: Anthropogenic Impacts on Optical Depth and Cloud Nuclei
This work examines more than 1000 vertical profiles from 11 major airborne campaigns in the Pacific hemisphere and confirms that regional enhancements in aerosol light scattering, mass, and number are associated with carbon monoxide from combustion and can exceed values in unperturbed regions by more than one order of magnitude. Expand
Global observations of aerosol-cloud-precipitation-climate interactions
Cloud drop condensation nuclei (CCN) and ice nuclei (IN) particles determine to a large extent cloud microstructure and, consequently, cloud albedo and the dynamic response of clouds toExpand
Satellite-based estimate of global aerosol-cloud radiative forcing by marine warm clouds
Changes in aerosol concentrations affect cloud albedo and Earth’s radiative balance. Aerosol radiative forcing from pre-industrial time to the present due to the effect of atmospheric aerosol levelsExpand
Aerosol effects on cloud water amounts were successfully simulated by a global cloud-system resolving model
The authors show that using explicit representation of cloud microphysics, in global scale modelling, rather than parameterisations, reduces the overestimation of aerosol effect on cloud properties. Expand
On the determination of a cloud condensation nuclei from satellite: Challenges and possibilities
[1] We use aerosol size distributions measured in the size range from 0.01 to 10+ μm during Transport and Chemical Evolution over the Pacific (TRACE-P) and Aerosol Characterization Experiment–AsiaExpand
Extensive closed cell marine stratocumulus downwind of Europe—A large aerosol cloud mediated radiative effect or forcing?
Marine stratocumulus clouds (MSC) cover large areas over the oceans and possess super sensitivity of their cloud radiative effect to changes in aerosol concentrations. Aerosols can cause transitionsExpand
Further evidence for CCN aerosol concentrations determining the height of warm rain and ice initiation in convective clouds over the Amazon basin
Abstract. We have investigated how aerosols affect the height above cloud base of rain and ice hydrometeor initiation and the subsequent vertical evolution of cloud droplet size and numberExpand
Cancellation of Aerosol Indirect Effects in Marine Stratocumulus through Cloud Thinning
Applying perturbation theory within a mixed layer framework, the response of the marine boundary layer (MBL) cloud thickness h to imposed increases of the cloud droplet concentration Nd as aExpand
Constraining the aerosol influence on cloud fraction
Aerosol-cloud interactions have the potential to modify many different cloud properties. There is significant uncertainty in the strength of these aerosol-cloud interactions in analyses ofExpand