Abstract
Abstract Shipboard radar-derived rain rates and satellite-observed IR brightness temperatures have been used to examine the relationship between cold cloud fractional coverage for brightness temperatures <235 K and areally averaged surface rainfall during the Tropical Ocean–Global Atmosphere Coupled Ocean–Atmosphere Response Experiment (TOGA COARE). A nearly linear relationship was observed with a ratio of mean rain rate to fraction cold cloud coverage of approximately 1 mm h−1. This is in contrast to the GOES precipitation index (GPI) methodology, which assumes a proportionality (GPI slope coefficient) of 3 mm h−1. It was also observed that when considering 5-day timescales, the relationship between the cold cloud fractional coverage and surface rainfall exhibited considerable variability. This variability was in phase with the interseasonal oscillations (ISOs). During the convectively active phase of the ISOs, the deep vertical wind shear (700–150 mb) was strong and the convective organization was domin...
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