How may low-cloud radiative properties simulated in the current climate influence low-cloud feedbacks under global warming?
DOI: 10.1029/2012GL053265
关键词: Cloud feedback 、 Global warming 、 Environmental science 、 Radiative transfer 、 Climate sensitivity 、 Climatology 、 Atmospheric sciences 、 Radiative cooling 、 Climate model 、 Cloud forcing 、 Climate change
摘要: [1] The influence of cloud modelling uncertainties on the projection tropical low-cloud response to global warming is explored by perturbing model parameters IPSL-CM5A climate in a range configurations (realistic general circulation model, aqua-planet, single-column model). While positive sign and mechanism predicted are robust, amplitude can vary considerably depending tuning parameters. Moreover, strength change exhibits strong correlation with radiative effects simulated current climate. We show that this primarily results from local feedback (referred as “beta feedback”) between boundary-layer cooling, relative humidity cover. Based observational constraints, it suggested projections might be overestimated about fifty percent.
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