El Arenosillo Atmospheric Station belongs to the National Institute for Aerospace Technology (INTA). It is located in the south-west of the Iberian Peninsula, close to the Atlantic coastline and next to Doñana National Park, one of the most important wetland ecosystems in Europe.
The station is based around a 100 m tall tower equipped with meteorological sensors at 10, 50 and 100 metres. A laboratory located at the base of the tower hosts the instrumentation used to measure trace gases such as CO, CO2 and CH4. The facility also includes temperature and humidity control to support stable instrumental operation.
In addition to the tower, an atmospheric observatory located approximately 450 m away provides complementary measurements of trace gases, aerosols, solar radiation and meteorological variables. These measurements include compounds and parameters such as O3, NOx, SO2, VOCs, particle properties, UV and global radiation.
The station provides observations of great scientific interest for studying air-mass transport between the Atlantic Ocean, the Mediterranean Sea and the interior of the Iberian Peninsula. Its location next to Doñana also gives it particular relevance for monitoring environmental change near a highly sensitive ecosystem.