Paul Snoeij1, Evert Attema2, Yasjka Meijer3, Daan Swart3

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The long-term validation phase of ENVISAT provides assurance of data quality and accuracy for applications such as climate change research. In addition, it performs long term monitoring for possible instrumental drifts and other artefacts. The paper will discuss the general status of the validation activities for GOMOS, MIPAS and SCIAMACHY. The main and long-term geophysical validation programme will be presented with focus on the validation of the atmospheric chemistry instruments by ground-based lidar.