Understanding Observed Changes in Atmospheric Solar Reflection and Surface Albedo
Exploring the attribution of changes in Earth's Albedo Shortwave Radiation (ASR) to various processes including atmospheric and surface contributions. The impacts of incident solar radiation, cloud reflection, absorption, and surface albedo are analyzed, along with the radiative sensitivity from isotropic models and observational trends in absorbed solar radiation. Satellite observations and radiative kernel calculations offer insights into these complex relationships.
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Presentation Transcript
Attributing observed ASR changes to processes Atmospheric Contribution To planetary Albedo Surface Contribution To planetary Albedo S = incident R = cloud reflection A = absorption = surface albedo (UNKNOWNS)
Surface reflection Climatological planetary albedo Surface contribution: = (1-A)(1-R)2 (1- R) Atmospheric reflection Impact of surface changes on ASR Atmosphere
Radiative sensitivity from isotropic model Isotropic model matches kernel calculations Satellite observations provide an estimate of Radiative sensitivity The model average radiative sensitivity is close to the observational estimate
Observational trends in Absorbed Solar from CERES (2000-2023) Model (ensemble mean) change in absorbed solar from radiative kernels
