Radar Image Reveals Seasonal Changes in Buenos Aires and Surrounding Landscape

A radar image from the Copernicus Sentinel-1 mission showcases Buenos Aires, Argentina’s capital, alongside its rural surroundings and the adjacent Rio de la Plata estuary. The composite image, generated from three separate captures in January, March, and May, employs a color-coded system to highlight different seasonal changes: blue represents January, green for March, and red for May. The environmental shifts have resulted in notable ‘backscatter’ radar reflections, allowing brighter shades to reflect alterations in the landscape over time.

In the image, the light grey area on the right indicates the urban expanse of Buenos Aires, home to over 16 million residents and situated 25 meters above sea level. The lack of significant color change in this region suggests stability in the cityscape between the beginning of the year and late spring. Nearby towns such as Luján and Junín are also displayed as smaller grey tokens to the west of the capital.

The blue segments of the image illustrate fluctuations on the water’s surface during January, which corresponds to Argentina’s summer. The rivers and expansive waterways are primarily rendered in various shades of blue, purple, or black. The Rio de la Plata estuary, located east of Buenos Aires, appears intermixed shades due to rough conditions and winds reported in both January and May.

Westward from the capital, the Argentine Pampas region features a landscape primarily characterized by agricultural fields. The green hues visible in March signify the significant radar backscatter from growing crops, particularly soy and corn, that thrive during the late summer months.

Upper parts of the image display the Entre Ríos province, located north of the Paraná River, where a pronounced red area signifies ground changes observed in May. This shift is likely attributed to the resurgence of natural vegetation spurred on by seasonal rainfall, marking a revival of grasslands after the dry summer months.