Low-Pressure and Sahara Dust from 7/27 to 7/28

For the last two days, a low-pressure zone and a layer of sand (dust) from the Sahara have been interacting in a harmonious dance.

Goes16 image for July 27 at 18:00 UTC
source : https://www.star.nesdis.noaa.gov/GOES/sector.php?sat=G16&sector=taw
Forecast of total Sahara dust in the air column of the SKIRON model for July 27 at 18:00 UTC
source : https://forecast.uoa.gr/en/forecast-maps/dust/north-atlantic

The Sahara dust limits the development of cloud structures in the low-pressure area and its convective movements, with progressive weathering visible on the animation. The depression favours the transport of the layer of dust towards North America.

The presence of Saharan dust in the atmosphere of the North Atlantic has many negative effects on health, in particular by reducing air quality with the presence of fine particles and bacteria. It also impacts the environment with a strong greenhouse effect which favours heat waves and drying of the air which modifies the frequency and the quantity of rainfall.

Conversely, the presence of particles modifies atmospheric dynamics, in particular cyclogenesis. In an atmosphere overloaded with sand, convection is limited or even stopped, cyclones have less favourable conditions to form.

The presence of large quantities of sand from the Sahara modifies our understanding of meteorology in the North Atlantic but also of the current and future climate. Years with large concentrations of Sahara dust disturb our perception of climate change.

Animation of Goes16 satellite images from Wednesday, July 27 to Thursday, July 28, 2022