The changing nature of Earth's reflected sunlight

Author:

Stephens Graeme L.12ORCID,Hakuba Maria Z.1,Kato Seiji3,Gettelman Andrew4,Dufresne Jean-Louis5ORCID,Andrews Timothy6,Cole Jason N. S.7ORCID,Willen Ulrika8,Mauritsen Thorsten9

Affiliation:

1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA

2. Department of Physics, University of Oxford, Oxford, UK

3. Climate Science Branch, NASA Langley Research Center, Hampton, VA, USA

4. National Center for Atmospheric Research, Boulder, CO, USA

5. Laboratoire de Meteorologie Dynamique, Institut Pierre et Simon Laplace, Paris, France

6. Met Office Hadley Centre, Exeter, UK

7. Canadian Centre for Climate Modelling and Analysis, Environment and Climate Change Canada, Victoria, British Columbia, Canada

8. Rossby Centre, Swedish Meteorological and Hydrological Institute, Norrkoping, Sweden

9. Department of Meteorology, Stockholm University, Stockholm, Sweden

Abstract

The increased rate of sea-level rise suggests that Earth's energy imbalance is also increasing over time. This study assesses whether 20 years of direct observations of this energy imbalance from Earth-orbiting satellites support the existence of a real trend in this imbalance and the components of it and finds. Changes to the imbalance observed are found to be consistent across multiple sources of observations. The majority of recent studies now clearly point to this energy imbalance being positive, while forced by increasing greenhouse gas concentrations in the atmosphere, being amplified significantly by decreases to the amount of sunlight reflected by Earth to space. Here, we show that the global changes observed appear largely from reductions in the amount of sunlight scattered by Earth's atmosphere. These reductions, in turn, are found to be almost equally split between reduced reflection from the cloudy and clear regions of the atmosphere, with the latter being suggestive of reduced scattering by aerosol particles over the observational period. Climate models, however, show an almost exclusive response from clouds, and a slightly exaggerated darkening of the surface. Thus, models that match the global shortwave change do so for the wrong reasons.

Funder

NASA

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

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