Editing Openai/680a25f8-9f18-8004-a42d-cd36374ba000 (section)

==== 🔥 Apply This to a Sunlit Ice Crystal ====

===== Example: =====
* Ambient T = 223 K (–50 °C)
* Ice crystal T after solar heating = ~230.7 K

From Murphy & Koop (2005):
* ei(223 K)≈4.02 Pae_i(223\,K) \approx 4.02 \, \text{Pa}ei(223K)≈4.02Pa
* ei(230.7 K)≈7.1 Pae_i(230.7\,K) \approx 7.1 \, \text{Pa}ei(230.7K)≈7.1Pa

👉 This is a +77% increase in vapor pressure from just a ~7 K temperature rise.

That’s a huge shift, and it’s precisely why even a modest warming from sunlight drives strong net sublimation unless RHi is extreme (>177%).