Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2024 Mar 26;14:7175. doi: 10.1038/s41598-024-57458-4

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

Diurnal variation, as a function of LMST, of the derived surface water activity concerning liquid (with a_w error bars) and measured ground temperature provided by MEDA during one full Martian year. For illustration, the environmental data are overlayed with the hydration lines of calcium and magnesium sulfates, and calcium perchlorate deliquescence and efflorescence lines. The water activity a_w is derived assuming equilibrium, from the relative humidity (RH), with respect to liquid, as a_w = RH/100, All data points to the left of the ice saturation line (RH_ice = 100%) are saturated with respect to ice and may allow frost formation⁷⁰. The Deliquescence RH (DRH) and hydration state lines of some perchlorates and sulfate salts are included for reference^19,72.