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A Cloud-Free Approach to Modeling Daily Downwelling Longwave Irradiance at Global Scale
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A Cloud-Free Approach to Modeling Daily Downwelling Longwave Irradiance at Global Scale
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Journal Article
A Cloud-Free Approach to Modeling Daily Downwelling Longwave Irradiance at Global Scale
2023
Overview
Parametric modeling of downwelling longwave irradiance under all-sky conditions (LW↓) typically involves “correcting” a clear- (or non-overcast) sky model estimate using solar-irradiance-based proxies of cloud cover in lieu of actual cloud cover given uncertainties and measurement challenges of the latter. While such approaches are deemed sound, their application in time and space is inherently limited. We report on a correction model free of solar irradiance-derived cloud proxies that is applicable at the true daily (24 hr) and global scales. The new “cloud-free” correction model demonstrates superior performance in a range of environments relative to existing cloud-free modeling approaches and to corrections based on solar-derived cloudiness proxies. Literature-based performance benchmarking indicates a performance that is often comparable to—and in some cases superior to—performances yielded by conventional parametric modeling approaches employing locally or regionally calibrated parameters, as well as to performances of satellite-based algorithms.
Publisher
American Geophysical Union,John Wiley & Sons, Inc,Wiley
Subject
