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Evidence for climate change in the satellite cloud record

Abstract

Clouds substantially affect Earth’s energy budget by reflecting solar radiation back to space and by restricting emission of thermal radiation to space1. They are perhaps the largest uncertainty in our understanding of climate change, owing to disagreement among climate models and observational datasets over what cloud changes have occurred during recent decades and will occur in response to global warming2,3. This is because observational systems originally designed for monitoring weather have lacked sufficient stability to detect cloud changes reliably over decades unless they have been corrected to remove artefacts4,5. Here we show that several independent, empirically corrected satellite records exhibit large-scale patterns of cloud change between the 1980s and the 2000s that are similar to those produced by model simulations of climate with recent historical external radiative forcing. Observed and simulated cloud change patterns are consistent with poleward retreat of mid-latitude storm tracks, expansion of subtropical dry zones, and increasing height of the highest cloud tops at all latitudes. The primary drivers of these cloud changes appear to be increasing greenhouse gas concentrations and a recovery from volcanic radiative cooling. These results indicate that the cloud changes most consistently predicted by global climate models are currently occurring in nature.

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Figure 1: Change in observed and simulated cloud amount and albedo between the 1980s and 2000s.
Figure 2: Zonal mean change in observed and simulated cloud amount and albedo between the 1980s and the 2000s.
Figure 3: Zonal mean change in observed and simulated cloud amount during the period 1983–2009 in seven pressure intervals.

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Acknowledgements

National Oceanic and Atmospheric Administration (NOAA) awards NA10OAR4310140 and NA10OAR4310141 supported work by J.R.N. and A.T.E. The efforts of M.D.Z. and S.A.K. were supported by the US Department of Energy (DOE), Office of Science, Office of Biological and Environmental Research through its Regional and Global Climate Modeling Program and were performed under the auspices of the DOE by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Part of the work by M.D.Z. was supported by the National Aeronautics and Space Administration (NASA) New Investigator Program (NNH14AX83I). The MAC-LWP climatology is supported by the NASA MEaSUREs Program (NNH12ZDA001N). We acknowledge the World Climate Research Programme’s (WCRP’s) Working Group on Coupled Modelling, which is responsible for the Coupled Model Intercomparison Project (CMIP), and we thank the climate modelling groups for producing and making available their model output. For CMIP the US DOE’s Program for Climate Model Diagnosis and Intercomparison provides coordinating support and led development of software infrastructure in partnership with the Global Organization for Earth System Science Portals.

Author information

Authors and Affiliations

Authors

Contributions

J.R.N. designed the study, provided ERBS, CERES, and ISCCP data, did the main analysis, and wrote the paper; R.J.A. provided standard model cloud output for CMIP5 simulations and analysed CMIP5 meteorological output; A.T.E. provided corrected PATMOS-x data; M.D.Z. provided CMIP5 COSP cloud output; C.W.O. provided MAC-LWP liquid water path data; and S.A.K. provided background information and ideas. All authors discussed the results and commented on the manuscript.

Corresponding author

Correspondence to Joel R. Norris.

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Competing interests

The authors declare no competing financial interests.

Additional information

Corrected ISCCP and PATMOS-x cloud amount data are available from the Research Data Archive at NCAR at http://dx.doi.org/10.5065/D62J68XR.

Extended data figures and tables

Extended Data Figure 1 Change in observed liquid water path during the period 1988–2014.

a, Linear trend in MAC-LWP liquid water path during January 1988 to December 2014. b, Zonal mean climatology (red) and trend (black) in MAC-LWP liquid water path during January 1988–December 2014 given as g m-2 per 25-year period. Circles indicate trend statistical significance (P < 0.05 two-sided). All trends are relative to the 60° S–60° N mean trend given as g m-2 per 25 year period.

Extended Data Figure 2 Change in observed cloud amount and albedo between January 1985 to December 1989 and January 2003 to December 2009.

a, Change in ISCCP total cloud amount given as a percentage amount per 25-year period. b, Change in PATMOS-x total cloud amount given as a percentage amount per 25-year period. c, Change in ERBS/CERES albedo given as a percentage albedo per 25-year period. Black dots indicate agreement among all three satellite records on sign of change in a, b and c. All changes are relative to the 60° S–60° N mean change.

Extended Data Figure 3 Correlation between forced simulated, unforced simulated, and observed cloud trend patterns.

Distribution of correlation between patterns from multiple unforced CMIP5 preindustrial simulations and the ensemble mean of CMIP5 simulations with all radiative forcings (ALL, black), only greenhouse radiative forcings (GHG, red), and only natural radiative forcings (NAT, blue) for 27-year trends. a, Grid box total cloud amount. b, Zonal mean total cloud amount. c, Zonal mean cloud amount in the 50–180 hPa and 180–320 hPa intervals. Vertical lines indicate correlation between the observed pattern and ensemble mean ALL, GHG, or NAT patterns. Fractional area under each distribution to the right of the vertical line is the corresponding P value in Table 1.

Extended Data Figure 4 Absolute change in simulated cloud amount during the period 1983–2009.

a, Linear trend in ensemble mean total cloud amount given as a percentage amount per 25-year period 1983–2009 from CMIP5 historical simulations with all radiative forcings (ALL). Data given as a percentage amount per 25-year period. b, Zonal mean climatology (red) and trend (black) in ensemble mean total cloud amount 1983–2009 from ALL simulations. c, Zonal mean trend in ensemble mean cloud amount 1983–2009 in seven pressure intervals from ALL simulations. Data given as a percentage amount per 25-year period. Black dots and circles indicate trend statistical significance (P < 0.05 two-sided), and bars indicate interquartile range of individual simulations. Unlike Figs 1c, 2d and 3d, trends are not relative to the 60° S–60° N mean trend.

Extended Data Figure 5 Change in simulated cloud amount between the 1980s and 2000s for different types of forcing.

Linear trend in ensemble mean total cloud amount given as a percentage amount per 25-year period. from CMIP5 simulations and locations where the majority of observational (Obs) datasets and the majority of simulations show increasing (blue) or decreasing (orange) cloud amount or albedo. a, b, Only greenhouse gas (GHG) forcing 1979–2005. c, d, Only anthropogenic aerosol (AA) forcing 1979–2005. e, f, Only ozone (OZ) forcing 1983–2009. g, h, Only natural (NAT) forcing 1983–2009. Black dots indicate trend statistical significance (P < 0.05 two-sided). All trends are relative to the 60° S–60° N mean trend.

Extended Data Figure 6 Zonal mean change in simulated cloud amount between the 1980s and 2000s for different types of forcing.

Climatology is red and linear trend is black for ensemble mean total cloud amount from CMIP5 simulations. Data given as a percentage amount per 25-year period. a, Only greenhouse gas (GHG) forcing 1979–2005. b, Only anthropogenic aerosol (AA) forcing 1979–2005. c, Only ozone (OZ) forcing 1983–2009. d, Only natural (NAT) forcing 1983–2009. Circles indicate trend statistical significance (P < 0.05 two-sided) and bars indicate interquartile range of individual simulations. All trends are relative to the 60° S–60° N mean trend.

Extended Data Figure 7 Zonal mean change in simulated cloud amount between the 1980s and 2000s in seven pressure intervals for different types of forcing.

Linear trend for ensemble mean cloud amount from CMIP5 simulations. a, Only greenhouse gas (GHG) forcing 1979–2005. Data given as a percentage amount per 25-year period. b, Only anthropogenic aerosol (AA) forcing 1979–2005. c, Only natural (NAT) forcing 1983–2009. Black dots indicate trend statistical significance (P < 0.05 two-sided). All trends are relative to the 60° S–60° N mean trend for that pressure interval.

Extended Data Figure 8 Change in simulated cloud amount during the period 1983–2009 from COSP.

a, Linear trend in ensemble mean total cloud amount 1983–2009 from CMIP5 historical simulations with all radiative forcings (ALL). Data given as a percentage amount per 25-year period. b, Zonal mean climatology (red) and trend (black) in ensemble mean total cloud amount 1983–2009 from ALL simulations. c, Zonal mean trend in ensemble mean cloud amount 1983–2009 in seven pressure intervals from ALL simulations. Black dots and circles indicate trend statistical significance (P < 0.05 two-sided), and bars indicate interquartile range of individual simulations. All trends relative to the 60° S–60° N mean trend.

Extended Data Table 1 CMIP5 models and number of simulations used for each forcing experiment
Extended Data Table 2 CMIP5 models and number of years in each preindustrial control simulation

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Norris, J., Allen, R., Evan, A. et al. Evidence for climate change in the satellite cloud record. Nature 536, 72–75 (2016). https://doi.org/10.1038/nature18273

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