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Title: Positive tropical marine low-cloud cover feedback inferred from cloud-controlling factors

Journal Article · · Geophysical Research Letters
 [1];  [1];  [2];  [1]
  1. Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Program for Climate Model Diagnosis and Intercomparison

Differences in simulations of tropical marine low-cloud cover (LCC) feedback are sources of significant spread in temperature responses of climate models to anthropogenic forcing. Here we show that in models the feedback is mainly driven by three large-scale changes—a strengthening tropical inversion, increasing surface latent heat flux, and an increasing vertical moisture gradient. Variations in the LCC response to these changes alone account for most of the spread in model-projected 21st century LCC changes. A methodology is devised to constrain the LCC response observationally using sea surface temperature (SST) as a surrogate for the latent heat flux and moisture gradient. In models where the current climate's LCC sensitivities to inversion strength and SST variations are consistent with observed, LCC decreases systematically, which would increase absorption of solar radiation. These results support a positive LCC feedback. Finally, correcting biases in the sensitivities will be an important step toward more credible simulation of cloud feedbacks.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1438791
Report Number(s):
LLNL-JRNL--740988
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 18 Vol. 42; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (36)

The relationship between interannual and long-term cloud feedbacks: INTERANNUAL AND LONG-TERM CLOUD FEEDBACKS journal December 2015
On the relationships among cloud cover, mixed-phase partitioning, and planetary albedo in GCMs: CLOUD COVER, MIXED-PHASE, AND ALBEDO journal May 2016
Earth System Modeling 2.0: A Blueprint for Models That Learn From Observations and Targeted High-Resolution Simulations: EARTH SYSTEM MODELING 2.0 journal December 2017
Identifying Meteorological Controls on Open and Closed Mesoscale Cellular Convection Associated with Marine Cold Air Outbreaks: Meteorological Controls on MCC Clouds journal November 2017
Equilibrium Climate Sensitivity Obtained From Multimillennial Runs of Two GFDL Climate Models journal February 2018
Analyzing the dependence of global cloud feedback on the spatial pattern of sea surface temperature change with a G reen's function approach journal September 2017
Cloud feedback mechanisms and their representation in global climate models: Cloud feedback mechanisms and their representation in GCMs journal May 2017
Observational Constraints on Cloud Feedbacks: The Role of Active Satellite Sensors book January 2017
Low-Cloud Feedbacks from Cloud-Controlling Factors: A Review book May 2016
Reducing Uncertainties in Climate Projections with Emergent Constraints: Concepts, Examples and Prospects journal December 2019
Seasonally variant low cloud adjustment over cool oceans journal October 2018
A refined model for the Earth’s global energy balance journal May 2019
Low-Cloud Feedbacks from Cloud-Controlling Factors: A Review journal October 2017
Observational Constraints on Cloud Feedbacks: The Role of Active Satellite Sensors journal November 2017
Processes Responsible for Cloud Feedback journal October 2016
Observations of Local Positive Low Cloud Feedback Patterns and Their Role in Internal Variability and Climate Sensitivity journal May 2018
Relationships Between Inversion Strength, Lower-Tropospheric Moistening, and Low-Cloud Fraction in the Subtropical Southeast Pacific Derived From Stable Isotopologues of Water Vapor journal August 2018
Changes in Marine Fog Over the North Pacific Under Different Climates in CMIP5 Multimodel Simulations journal October 2018
Insensitivity of the Cloud Response to Surface Warming Under Radical Changes to Boundary Layer Turbulence and Cloud Microphysics: Results From the Ultraparameterized CAM journal December 2018
Low‐Cloud Feedback in CAM5‐CLUBB: Physical Mechanisms and Parameter Sensitivity Analysis journal November 2018
Observational Evidence for Two Modes of Coupling Between Sea Surface Temperatures, Tropospheric Temperature Profile, and Shortwave Cloud Radiative Effect in the Tropics journal August 2019
The Dependence of Shallow Cumulus Macrophysical Properties on Large‐Scale Meteorology as Observed in ASTER Imagery journal November 2019
Strong Dependence of Atmospheric Feedbacks on Mixed‐Phase Microphysics and Aerosol‐Cloud Interactions in HadGEM3 journal June 2019
Clearing clouds of uncertainty journal September 2017
Impact of decadal cloud variations on the Earth’s energy budget journal October 2016
Low clouds link equilibrium climate sensitivity to hydrological sensitivity journal September 2018
Progressing emergent constraints on future climate change journal March 2019
Relationship of tropospheric stability to climate sensitivity and Earth’s observed radiation budget journal November 2017
Feedback mechanisms of shallow convective clouds in a warmer climate as demonstrated by changes in buoyancy journal May 2018
Seasonal and Interannual Variation Characteristics of Low-Cloud Fraction in Different North Pacific Regions journal March 2019
ESD Reviews: Climate feedbacks in the Earth system and prospects for their evaluation text January 2019
Cloud feedbacks in extratropical cyclones: insight from long-term satellite data and high-resolution global simulations journal January 2019
Evaluating models' response of tropical low clouds to SST forcings using CALIPSO observations journal January 2019
Cloud feedbacks in extratropical cyclones: insight from long-term satellite data and high-resolution global simulations posted_content August 2018
ESD Reviews: Climate feedbacks in the Earth system and prospects for their evaluation journal January 2019
Equilibrium Climate Sensitivity Obtained From Multimillennial Runs of Two GFDL Climate Models text January 2018

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