The Arctic PASSION project is described in more detail in the project website which is available at https://arcticpassion.eu/. The purpose of Arctic PASSION is creation and implementation of a coherent, integrated Arctic observing system. This implies integrating already existing observing systems in a system of systems approach as well addressing gaps in the current observing system. Arctic PASSION will generate data through the project implementation, but equally important is to map and establish access to already existing datasets in support of the pilot services and other activities of Arctic PASSION. Arctic PASSION will exploit existing data in the region. In particular operational meteorological data made available through WMO Global Telecommunication System (GTS) will be important for the model experiments. No full overview of third party data that will be used is currently available. In order to support the other work packages and the overall objective of Arctic PASSION, a website containing a human interface to the data catalogue and guidance material for data providers is established. This document provides information on the website.