It is shown that an antisolar peak can clearly be detected in backscattered near‐infrared reflectances from deep convective cloud tops. This peak should be caused only by regularly faceted ice crystals, primarily columns and plates, rather than rimed or irregular particles. Using 13 years of AVHRR (advanced very high resolution radiometer) data, the average peak stands 22% above the background for sampled clouds having brightness temperatures below 220 K; the implied mean contribution of pristine crystals to …
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