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The impact of horizontal heterogeneities, liquid water path (LWP fromAMSR-E), and cloud fraction (CF) on MODIS cloud effective radius (re),retrieved from the 2.1 μm (re2.1) and 3.8 μm(re3.8) channels, is investigated for warm clouds over the southeastPacific. Values of re retrieved using the CERES algorithms are averagedat the CERES footprint resolution (∼20 km), while heterogeneities(Hσ) are calculated as the ratio between the standard deviationand mean 0.64 μm reflectance. The value of re2.1 stronglydepends on CF, with magnitudes up to 5 μm larger than those forovercast scenes, whereas re3.8 remains insensitive to CF. For cloudyscenes, both re2.1 and re3.8 increase with Hσ for anygiven AMSR-E LWP, but re2.1 changes more than for re3.8.Additionally, re3.8–re2.1 differences are positive (<1 μm) forhomogeneous scenes (Hσ < 0.2) and LWP > 45 gm−2, andnegative (up to −4 μm) for larger Hσ. Whilere3.8–re2.1 differences in homogeneous scenes are qualitativelyconsistent with in situ microphysical observations over the region of study,negative differences – particularly evinced in mean regional maps – are morelikely to reflect the dominant bias associated with cloud heterogeneitiesrather than information about the cloud vertical structure. The consequencesfor MODIS LWP are also discussed

The impact of horizontal heterogeneities, cloud fraction, and liquid water path on warm cloud effective radii from CERES-like Aqua MODIS retrievals