Revealing bias characteristics of cloud diurnal variation to aid climate model tuning and improvement

The cloud fraction diurnal variation (CDV) regulates the Earth system’s radiative budget and balance, influencing atmospheric variables such as temperature and humidity, as well as physical processes like precipitation and tropical cyclones. However, significant simulation biases of CDV exist in climate models. To date, most model evaluations have focused on the daily mean cloud fraction (CFR), while the CDV has received less attention.

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