Sublimation

Environmental Forum Forums EddyPro Sublimation

This topic contains 1 reply, has 2 voices, and was last updated by  gerardo 12 months ago.

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  • #8146

    georg
    Participant

    Hi all,
    I would like to calculate the sublimation rate over a snow covered area. So, is there any functionallity in EddyPro to change from the latent heat of vaporization to the latent heat of sublimation?

    Thanks in advance!
    Georg

    #8147

    gerardo
    Participant

    Hi Georg,
    no, there is currently no functionality in EddyPro to compute sublimation fluxes. There have been a few requests in past to add it though, and I think this is the best moment as we approach our next release.

    How would you go about it? Please think over the following questions, and provide as much input as you can:

    1. Would EddyPro switch from latent heat of vaporization (lamda_v) to latent heat of sublimation (lambda_s) based on half-hour mean temperature being < 0 degC? In a related exchange with a colleague (quite some time ago), he pointed out that:
    “[…] In snow-covered areas there can be liquid water in the snow-pack at sub-zero air temperatures if you have high levels of solar radiation. During winter period there may also be short (hours) periods with positive degrees where the access to liquid water is very limited.”
    This would imply that there is no viable way to know how much water vs. ice is changing phase. However, the same colleague eventually convened that using 0 degC as a threshold to switch lambda is probably good enough.

    2. Would you prefer to have two separate columns for the two LE (LE_v and LE_s) or simply use LE? In this second case, would you prefer to have two separate columns for lambda_v and lambda_s or, again, only one column lambda?

    3. Do you agree to use lambda_s as per Nakai et al. 2013?
    https://ac.els-cdn.com/S187396521300008X/1-s2.0-S187396521300008X-main.pdf?_tid=41eeb0d0-3745-4b68-a7da-f6a214daa068&acdnat=1524903570_810434c9944e583cc2b70edeaf4b315e

    Thanks a lot!
    Gerardo

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