Humidity observations and column simulations for a warm period at the Mars Phoenix lander site : Constraining the adsorptive properties of regolith

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Savijärvi , H , Martinez , G M , Fischer , E , Renno , N O , Tamppari , L K , Zent , A & Harri , A-M 2020 , ' Humidity observations and column simulations for a warm period at the Mars Phoenix lander site : Constraining the adsorptive properties of regolith ' , Icarus , vol. 343 , 113688 . https://doi.org/10.1016/j.icarus.2020.113688

Title: Humidity observations and column simulations for a warm period at the Mars Phoenix lander site : Constraining the adsorptive properties of regolith
Author: Savijärvi, Hannu; Martinez, G.M.; Fischer, E.; Renno, N.O.; Tamppari, L.K.; Zent, A.; Harri, Ari-Matti
Contributor organization: Institute for Atmospheric and Earth System Research (INAR)
Date: 2020-06
Language: eng
Number of pages: 8
Belongs to series: Icarus
ISSN: 0019-1035
DOI: https://doi.org/10.1016/j.icarus.2020.113688
URI: http://hdl.handle.net/10138/340194
Abstract: Two recalibrated sets of Phoenix (PHX) near-surface TECP air humidity measurements were compared with results from adsorptive single column model simulations during a warm clear-sky polar midsummer period, PHX sols 50-60. The model's 2 m temperatures were close to the observed values. Relative humidity (RH) is very low during the day but at night RH at 2 m reaches nearly 100% by the Zent et al. (2016) recalibration (Z), and 60-70% by the Fischer et al. (2019) recalibration (F). Model values of RH2m are close to Z and F at night and to F during the day. All three imply low water vapor pressures near the surface at night, 0.03-0.05 Pa, with a rapid increase each morning to 0.3-1 Pa and a decrease in the evening by both F and the model simulation. The model's daily adsorbed and desorbed water is in balance for regolith porosity of 16% (instead of 35% for lower latitudes). The depleted layer of nighttime air moisture extends to only about 200 m above the surface; hence the model's precipitable water content stays around the observed similar to 30 mu m throughout the sol. The model's moisture cycle is not sensitive to tortuosity of the regolith but the in-pore molecular diffusivity should be at least 5 cm(2)/s for fair agreement with the observations. In the adsorption experiments there is no fog and just a hint of ground frost, as observed during this period. Strong night frosts appear if adsorption is made weak or absent in the model.
Subject: 115 Astronomy, Space science
Mars
climate
surface
meteorology
ICE
CURIOSITY
EXCHANGE
TRANSPORT
WATER CYCLE
H2O
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion


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