Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Brèves → Brèves 2022 → Deserts ’breathe’ water vapor, study shows

Deserts ’breathe’ water vapor, study shows

ScienceDaily (March 30, 2022)

Titre : Deserts ’breathe’ water vapor, study shows

Deserts may seem lifeless and inert, but they are very much alive. Sand dunes, in particular, grow and move — and according to a decades long research project, they also ’breathe’ humid air.

ScienceDaily (March 30, 2022)

Présentation
The findings show for the first time how water vapor penetrates powders and grains, and could have wide-ranging applications far beyond the desert — in pharmaceutical research, agriculture and food processing, as well as planetary exploration.

Wanting to measure matter with greater sensitivity, lead author Michel Louge, professor of mechanical and aerospace engineering at Cornell University, developed a new form of instrumentation called capacitance probes, which use multiple sensors to record everything from solid concentration to velocity to water content, all with unprecedented spatial resolution.

In the early 2000s, Louge began collaborating with Ahmed Ould el-Moctar from University of Nantes, France, to use the probes to study the moisture content in sand dunes to better understand the process by which agricultural lands turn to desert — an interest that has only become more urgent with the rise of global climate change.

The probe eventually revealed just how porous sand is, with a tiny amount of air seeping through it. Previous research hinted this type of seepage existed in sand dunes, but no one had been able to prove it until now.

Story Source  : Cornell University

Annonce (ScienceDaily)

Annonce (Phys.org/news)

Page publiée le 12 janvier 2023, mise à jour le 13 janvier 2023