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Openai/680a25f8-9f18-8004-a42d-cd36374ba000
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===== - Ice crystals of ~20 µm diameter are not fully transparent in the solar spectrum. ===== * Near-IR absorption is significant and varies with particle size and wavelength. For 20 µm particles, absorptivity is around 0.3–0.4 — not 1. * In the near-IR (which dominates at high altitudes), the absorptivity for 20 µm particles is typically 0.644 (Warren, 1984), not 1. * Your claim of full absorptivity of 1 is incorrect. It’s already clear from the literature that these particles absorb solar radiation primarily in the near-IR with much lower efficiency in the visible range.
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